A Noxious Gas Purificant and Its Preparation and Purification Method Thereof

Abstract

The invention relates to a noxious gas purificant and its preparation and purification method for removing nitrogen oxides from gas streams thereof. The preparing method is characterized in that: mixing, according to a predetermined ratio and a process, a salt of iron, manganese, cobalt, or copper, and a related derivative thereof, an alkali or alkaline substance and a related derivative thereof, water and a forming agent, so as to obtain a solid compound or mixture; drying and activating the solid compound or mixture to produce a solid product as the purificant; and introducing the purificant into a gas-solid reactor, and removing noxious gases in a gas stream by performing, in a preconfigured temperature and using the purificant, a gas-solid reaction on the harmful gases in the gas stream. The purificant can be recycled and reused.

Claims

1. A gas purificant for the removal of nitrogen oxides which include nitric oxide or mainly nitric oxide from a gas stream, wherein the composition of said purificant includes one or any two or more of component L: iron, cobalt, manganese and copper, one or any two or more of component H: sodium, potassium, lithium, calcium, barium and magnesium, one or two or more of component Q: sulfate, chloride and carbonate radical, one or two of component D: hydroxyl and water, and component E of oxygen which does not include oxygen in sulfate radical, carbonate radical, hydroxyl, and water, wherein the mass percentage of each component in the purification is component L from 4 to 96%, component H from 1 to 75%, component Q from 1 to 75%, component D from 1 to 75%, and component E from 0 to 35%.

2. A purificant according to claim 1, wherein the purificant is mainly composed of component A: iron, one or any two or more of component B: sodium, potassium and lithium, component C: sulfate radical, one or two of component D: hydroxyl and water, component E: oxygen (excluding oxygen in sulfate, hydroxyl, and water), wherein the mass percentage of each component in the purificant is component A from 10 to 96%, component B from 1 to 60%, component C from 1 to 75%, component D from 1 to 40%, and component E from 0.5 to 35%.

3. A purificant according to claim 1, wherein the purificant is mainly composed of component A: iron, one or two or any more of component B: sodium, potassium and lithium, one or any two or more of component F: calcium, magnesium and strontium, component C: sulfate radical, one or two of component D: hydroxyl and water, component E: oxygen (excluding sulfate radical and oxygen in hydroxyl, and water), wherein the mass percentage of each component in purificant is component A from 10 to 96%, component B from 1 to 60%, component F from 1 to 75%, and component C from 1 to 75%, component D from 1 to 40% and component E from 0.5 to 35%.

4. A purificant according to claim 1, wherein the purificant is mainly composed of component A: iron, one or any two or more of component F: calcium, magnesium and barium, component C: sulfate radical, one or two of component D: hydroxyl and water, component E: oxygen (excluding oxygen in radical and hydroxyl), wherein the mass percentage of each component is component A from 5 to 96%, component F from 1 to 75%, component C from 1 to 75%, component D from 1 to 40% and component E: from 0 to 35%.

5. A purificant according to claim 1, wherein the purificant is mainly composed of component A: iron, one or any two or more of component F: calcium, magnesium and barium, component G: chlorine, one or two of component D: hydroxyl and water, and component E: oxygen (excluding oxygen in hydroxyl group), wherein the mass percentage of each component is component A from 5 to 96%, component F from 1 to 75%, component G from 1 to 75%, component D from 1 to 40%, and component E from 0 to 35%.

6. A purificant according to claim 1, wherein the purificant is mainly composed of component A: iron, one or any two or more of component B: sodium, potassium and lithium, one or any two or more of component F: calcium, magnesium and barium, component G: chlorine, one or two of component D: hydroxyl and water, and component E: oxygen (excluding oxygen in hydroxyl), wherein the mass percentage of each component is component A from 5 to 96%, component B from 1 to 60%, component F from 1 to 75%, component G from 1 to 75%, component D from 1 to 40%, and component E from 0 to 35%.

7. A purificant according to claim 1, wherein the purificant is mainly composed of component A: iron, one or any two or more of component H: sodium, potassium, lithium, calcium, barium and magnesium, component G: chlorine, one or two of component D: hydroxyl and water, wherein the mass percentage of each component is component A from 5 to 96%, component H from 1 to 75%, component G from 1 to 60%, and component D from 1 to 50%.

8. A purificant according to claim 1, wherein the purificant is mainly composed of component A: iron, one or any two or more of component H: sodium, potassium, lithium, calcium, barium and magnesium, component M: carbonate radical, one or two of component D: hydroxyl and water, and component E: oxygen (excluding oxygen in carbonate radical, hydroxyl and water), wherein the mass percentage of each component is component A from 4 to 96%, component H from 1 to 75%, component M from 1 to 75%, component D from 1 to 75%, and component E of 0 or from 0.1 to 35%.

9. (canceled)

10. A purificant according to claim 1, wherein the purificant is mainly composed of one or any two or more of component P: cobalt, manganese and copper, one or any two or more of component H: sodium, potassium, lithium, calcium, barium and magnesium, one or any two or more of component Q: sulfate, chlorine and carbonate radical, one or two of component D: hydroxyl and water, and component E: oxygen (excluding oxygen in sulfate, carbonate, hydroxyl, and water), wherein the mass percentage of each component is component P from 4 to 96%, component H from 1 to 75%, component Q from 1 to 75%, component D from 1 to 75%, and component E of 0 or from 0.1 to 35%.

11. (canceled)

12. A purificant according to claim 1, wherein the purificant is mainly composed of component A: iron, one or any two or more of component P: cobalt, manganese and copper, one or any two or more of component H: sodium, potassium, lithium, calcium, barium and magnesium, one or any two or more of component Q: sulfate, chlorine and carbonate radical, one or two of component D: hydroxyl and water, and component E: oxygen (excluding oxygen in sulfate, carbonate, hydroxyl and water), wherein the mass percentage of each component is components A and P from 4 to 96%, component H from 1 to 75%, component Q from 1 to 75%, component D from 1 to 75%, component E of 0 or from 0.1 to 35%.

13. (canceled)

14. A preparation method of the purificant according to claim 1, wherein the purificant is prepared by drying at the temperature of 40 C. or above or drying at the temperature of 40 C. or above and activating at the temperature of 100 C. or above of the mixture of material U, material V and water, wherein material U is one or any two or more of the salts of sulfates, chlorides and carbonates of component L: iron (II) or iron (III), cobalt (II), manganese (II), copper (I) or copper (II), or one or any two or more of basic salts, acid salts, complex salts, polymeric compounds, coordination compounds and related compounds of said salts, which includes ammonium ferrous sulfate, ammonium ferrous chloride, basic ferric sulfate, basic ferric chloride, oxy basic ferric sulfate, ammonium ferric sulfate, cuprous sulfate, cuprous chloride, basic cupric sulfate, basic copper chloride, copper ammonium sulfate, copper ammonium chloride, basic manganese sulfate, basic manganese chloride, ammonium manganese sulfate, ammonium manganese chloride, basic cobalt sulfate, basic cobalt chloride, ammonium cobalt sulfate, ammonium cobalt chloride, polyferric aluminum sulfate, polyaluminum ferric chloride, potassium iron sulfate, ferrous hydrogencarbonate and tetraammine copper sulfate; wherein material V is one or any two or more of the hydroxides and carbonates of sodium, potassium and lithium, one or any two or more of oxides, hydroxides and carbonates of calcium, barium and magnesium, and one or any two or more of related compounds of acid salts, basic salts and complex salts, which includes sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium oxide, barium oxide, magnesium oxide, calcium hydroxide, barium hydroxide, magnesium hydroxide, sodium carbonate, sodium hydrogencarbonate, potassium carbonate, potassium hydrogencarbonate, Lithium carbonate, lithium hydrogencarbonate, calcium carbonate, calcium hydrogencarbonate, basic calcium carbonate, barium carbonate, barium hydrogencarbonate, magnesium carbonate, magnesium hydrogencarbonate, basic magnesium carbonate, ammonium hydrogen carbonate and aluminum magnesium carbonate.

15. A preparation method of the purificant according to claim 14, wherein the preparation method includes: said purificant which is obtained by drying or drying and activating of the mixture of ferrous sulfate, one or any two or more of the hydroxides of said component B, and water; or by drying or drying and activating of the mixture of ferrous hydroxide, one or any two or more of the sulfates of component B, and water; or said purificant which is obtained by drying or drying and activating of the mixture of ferrous sulfate, one or any two or more of the hydroxides of said component B, and water, and one or any two or more of the oxides and hydroxides of said component F; or by drying or drying and activating of the mixture of ferrous sulfate, one or any two or more hydroxides of said component B, one or any two or more of the oxides and hydroxides of component F, and water; or by drying or drying and activating of the mixture of ferrous hydroxide, one or any two or more of the sulfates of component B, one or any two or more of the oxides or hydroxides of component F, and water; or said purificant which is obtained by drying or drying and activating of the mixture of ferrous sulfate, one or any two or more of the oxides and hydroxides of said component F, and water; or by drying or drying and activating of the mixture of ferrous hydroxide, one or any two or more of the sulfates of component F, and water; or said purificant which is obtained by drying or drying and activating of the mixture of ferrous chloride, one or any two or more of oxides and hydroxides of said component F, and water; or by drying or drying and activating of the mixture of ferrous hydroxide, one or any two or more of the sulfates of component F, and water; or said purificant which is obtained by drying or drying and activating of the mixture of ferrous chloride, one or any two or more of the hydroxides of component B, and water, and one or any two or more of the oxides and hydroxides of said component F; or by drying or drying and activating of the mixture of ferrous chloride, one or any two or more of the hydroxides of component B, one or any two or more of the oxides or hydroxides of component F, and water; or by drying or drying and activating of the mixture of ferrous hydroxide, one or any two or more of the chlorides of component B, one or any two or more of the oxides or hydroxides of component F, and water; or said purificant which is obtained by drying or drying and activating of the mixture of ferric chloride, one or any two or more of the hydroxides of component B, and water; or by drying or drying and activating of the mixture of ferric chloride, one or any two or more of the oxides or hydroxides of component F, and water; or by drying or drying and activating of the mixture of ferric chloride, one or any two or more of the hydroxides of component B, one or any two or more of the oxides or hydroxides of component F, and water; or said purificant which is obtained by drying or drying and activating of the mixture of ferrous carbonate, one or any two or more of the hydroxides of component B, and water; or by drying or drying and activating of the mixture of ferrous carbonate, one or any two or more of the oxides and hydroxides of component F, and water; or by drying or drying and activating of the mixture of ferrous carbonate, one or any two or more of the hydroxides of component B, one or any two or more of the oxides and hydroxides of component F, and water; or said purificant which is obtained by drying or drying and activating of the mixture of material W, material Y, and water, wherein material W is one or any two or more of the salts of sulfates, chlorides and carbonates of component P, and material Y is one or any two or more of the hydroxides of component B; or which is obtained by drying or drying and activating of the mixture of the material W, material F, and water, wherein material F is one or any two or more of oxides and hydroxides and carbonates of component F; or which is obtained by drying or drying and activating of the mixture of the material W, the material Y, the material F, and water; or said purificant which is obtained by drying or drying and activating of the mixture of material X, the material W, the material Y and water, wherein said material X is one or any two or more of the sulfates, chlorides and carbonates of the component A of iron; or by drying or drying and activating of the mixture of the material X, the material W, the material F and water; or by drying or drying and activating of the mixture of the material X, the material W, the material Y, the material F, and water.

16. A preparation method of the purificant according to claim 14, wherein said purificant is obtained by drying or drying and activating of the mixture of one or any two or more of the hydroxides and complex compounds of the component L, one or any two or more of the sulfates and chlorides and carbonate and corresponding basic and acid salts and complex salts of the component H, and water, wherein said hydroxides and complex compounds of said component L include ferrous hydroxide, iron hydroxide, manganese (II) hydroxide, cobalt (II) hydroxide, copper hydroxide, cuprous hydroxide, cupric tetramminohydroxide and cobalt tetraamminohydroxide; said basic and acid salts and complex salts include sodium hydrogen sulfate, potassium hydrogen sulfate, lithium hydrogen sulfate, calcium hydrogen sulfate, barium hydrogen sulfate, magnesium hydrogen sulfate, sodium hydrogencarbonate, potassium hydrogencarbonate, lithium hydrogencarbonate, calcium hydrogencarbonate, barium hydrogencarbonate, magnesium bicarbonate, basic calcium carbonate, basic magnesium carbonate, aluminum magnesium carbonate, potassium aluminum sulfate and potassium iron sulfate; wherein said hydroxides may be replaced by corresponding carbonates, basic carbonates, basic sulfates and basic chloride, which includes ferrous carbonate, iron carbonate, manganese carbonate, basic cobalt acid, copper carbonate, basic copper carbonate, basic aluminum magnesium carbonate, basic ferric sulfate, polyferric chloride, oxy basic ferric sulfate, basic copper sulfate, basic copper chloride, basic manganese sulfate, basic manganese chloride, basic cobalt sulfate, basic cobalt chloride, polymeric aluminum sulfate and polymeric aluminum-ferric chloride.

17. A preparation method of the purificant according to claim 14, wherein the solid product of said purificant is obtained by mixing ferrous sulfate heptahydrate, cobalt sulfate heptahydrate, manganese sulfate tetrahydrate and copper sulfate pentahydrate respectively with sodium hydroxide and calcium oxide in a mixing reactor at a mole ratio of about 1:1:3, and being dried and activated after mixing reaction.

18. A preparation method of the purificant according to claim 14, wherein said purificant is obtained by mixing ferrous carbonate, manganese carbonate and basic copper carbonate respectively with potassium hydroxide, calcium carbonate and water in a mixing reactor at a mole ratio of about 1:2:2:6, and being dried and activated after mixing reaction.

19. A preparation method of the purificant according to claim 14, wherein said purificant is obtained by mixing the solutions (about 50% water) of ferrous chloride, ferric chloride, cobalt chloride, manganese chloride and copper chloride respectively with sodium hydroxide and calcium carbonate in a mixing reactor at a mole ratio of about 1:2:2, and being dried and activated after mixing reaction.

20. A preparation method of the purificant according to claim 14, wherein said purificant is obtained by mixing ferrous sulfate heptahydrate, cobalt sulfate heptahydrate, manganese sulfate tetrahydrate, copper sulfate pentahydrate and potassium hydroxide in a mixing reactor at a mole ratio of about 1:1:1:1:1:8, and then adding and mixing calcium sulfate dihydrate with an amount equal to 15% of the gross mass amount of total material to the mixture, and then being preformed to the shape of honeycomb cylinder, and finally being dried and activated.

21. A preparation method of the purificant according to claim 14, wherein the mole ratio of sulfates, chlorides and carbonates of component L to the hydroxides of sodium, potassium, lithium of component B and/or the oxides and hydroxides of calcium, barium and magnesium of component B is 1:0.1 or more; the mole amount of the addition of said water is 1 to 20 times of the total amount of the material, and no water or less water is needed for hydrate compounds of said sulfates, chlorides and carbonates.

22. A preparation method of the purificant according to claim 14, wherein a molding agent is added before drying process, which includes one or any two or more of oxides and hydroxides and sulfates and carbonates of component F and all related acid or basic or polymeric compounds or complex salts or coordination compounds, clay and silicate, such as calcium silicate, magnesium silicate or aluminum silicate, with an addition amount of 1-85% of total volume.

23. (canceled)

24. A preparation method of the purificant according to claim 14, wherein the purificant may be molded to the shapes of honeycombs, plates or granules; or loaded on a general-purpose catalyst carrier such as alumina particles or honeycomb ceramics.

25. A purification method of the purificant according to claim 1, wherein both said purificant and a gas stream containing nitrogen oxide are introduced into a gas-solid reactor, in which nitrogen oxide in the gas stream are removed by gas-solid adsorption reaction with the purificant; said gas-solid reactor includes fixed bed, moving bed, bubbling bed reactor, fluidized bed and circulating fluidized bed gas-solid contact reactor; and the working temperature of the purificant is from 150 to 550 C.

26. A regeneration method of the purificant according to claim 1, wherein said purificant is regenerated in an inert gas or air or in the presence of a reducing agent, said reducing agent includes hydrogen, methane, ammonia or urea and carbon monoxide; and the regeneration temperature of the purificant is 150 C. or higher.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG. 1 is a schematic structural view of a circulating fluidized bed gas-solid reactor.

[0055] FIG. 2 is a schematic structural view of a countercurrent moving bed gas-solid reactor.

[0056] FIG. 3 is a schematic structural view of a fixed bed gas-solid reactor gas-solid reactor.

DETAILED DESCRIPTION

[0057] The instant invention is further described in detail below with reference to the accompanying drawings and embodiments. The examples are illustrated by using the compound of ferrous sulfate of material A as a representative, and other similar compounds of materials A and P are exemplified. Material H is represented by an alkali metal hydroxide or an alkaline earth metal oxide and hydroxide, and other compounds of material H are exemplified.

Example 1

[0058] A preparation method of the purificant: add ferrous sulfate, sodium hydroxide and water to a mixing reactor at a ratio of about 1:0.1:2 (molar ratio, same below). After the mixing reaction (about 10-30 minutes, same below, maybe some different for different materials), the product is dried and activated in air sequentially. Drying temperature is about 40 to 60 C. and lasting for about 3 hours to remove the water content in the product. Activating temperature is about 100 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 2

[0059] A preparation method of the purificant: add cobalt sulfate heptahydrate and sodium hydroxide to a mixing reactor at a ratio of about 1:1. After the mixing reaction, the product is dried and activated in air sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 150 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 3

[0060] A preparation method of the purificant: add ferrous sulfate heptahydrate and sodium hydroxide to a mixing reactor at a ratio of about 1:2. After the mixing reaction, the product is dried and activated in nitrogen gas sequentially. Both the drying and activating temperature is the same of about 250 C. and lasting for about 2 hours (including activation). The obtained solid product is one purificant of present invention.

Example 4

[0061] A preparation method of the purificant: add manganese sulfate tetrahydrate and lithium hydroxide to a mixing reactor at a ratio of about 1:3. After the mixing reaction, the product is dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 350 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 5

[0062] A preparation method of the purificant: add copper sulfate pent hydrate and potassium hydroxide to a mixing reactor at a ratio of about 1:2. After the mixing reaction, the product is dried and activated in air sequentially. Both the drying and activating temperature is about 450 C. and lasting for about 1 hour (including activation). The final obtained solid product is one purificant of present invention.

Example 6

[0063] A preparation method of purificant: add ferrous sulfate heptahydrate, sodium carbonate and water to a mixing reactor at a ratio of about 1:1:2 and heat appropriately. After the mixing reaction, the product is dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 450 to 500 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 7

[0064] A preparation method of the purificant: add ferrous hydroxide, sodium sulfate and water to a mixing reactor at a ratio of about 1:1:3. After the mixing reaction, the product is dried in the temperature range of about 60 to 95 C. under a reduced pressure and lasting for about 1 hour. The sequential activation is performed in nitrogen gas at the temperature of 450 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 8

[0065] A preparation method of the purificant: add ferrous carbonate, potassium hydroxide, sodium sulfate and water to a mixing reactor at a ratio of about 1:2:1:5. After the mixing reaction, the product is dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 550 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 9

[0066] A preparation method of purificant: add manganese carbonate, sodium hydroxide, calcium sulfate and water to a mixing reactor at a ratio of about 1:2:1:5. After the mixing reaction, the product is dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 500 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 10

[0067] A preparation method of purificant: add basic copper carbonate, sodium sulfate and water to a mixing reactor at a ratio of about 1:1:5. After the mixing reaction, the product is dried in nitrogen gas and activated in air sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 500 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 11

[0068] A preparation method of the purificant: add about 20% the volume of the product obtained by mixing manganese sulfate tetrahydrate and potassium hydroxide before drying in above example 4, and the other operation steps are the same. The final obtained solid product is a purificant of present invention.

Example 12

[0069] A preparation method of the purificant: add ferrous sulfate, ammonia water (concentration about 35%) and calcium sulfate to a mixing reactor at a ratio of about 1:1:2. After the mixing reaction, precipitate and remove the clear water layer. The solid product is then dried and activated in air sequentially. Drying temperature is about 40 to 60 C. and lasting for about 3 hours. Activating temperature is about 450 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 13

[0070] A preparation method of the purificant: each solution (about 50% water) of ferric sulfate, ferrous chloride, ferric chloride, cobalt chloride, manganese chloride or copper chloride is respectively mixed with sodium hydroxide in a mixing reactor at a ratio of about 1:1.5. After the mixing reaction, calcium carbonate (30% of the amount of above product after mixing reaction) is added into the mixing reactor as a molding agent. The solid product is then dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 450 C. When the gas component in the gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 14

[0071] A preparation method of said purificant: add ferrous sulfate heptahydrate, cobalt sulfate heptahydrate, manganese sulfate tetrahydrate, copper sulfate pentahydrate and potassium hydroxide to a mixing reactor at a ratio of about 1:1:1:1:8. After the mixing reaction, the product is dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 550 C. When the gas component in gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 15

[0072] A preparation method of said purificant: add titanium dioxide solid powder (anatase phase) to the product after the mixing reaction in above example 3 (the amount of titanium dioxide added occupied a 10% of the weight of total material). After mixing reaction, the product is dried in temperature range of about 40 to 60 C. under a reduced pressure and lasting for about 2 hour. The sequential activation is performed in nitrogen gas at 350 C. When the gas component in gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 16

[0073] A preparation method of said purificant: add kaolin (also called clay) as a molding agent and iron powder as a compounding agent to the product after the mixing reaction in above Example 3, the dosage of kaolin is about 20% of the weight of total material, and iron powder is about 95%. After completely mixing, the mixture is preformed to the shape of honeycomb cylinder with the dimensions of 50 mm in diameter and 50 mm long, and 15 holes (each 3 mm in diameter) uniformly distributed across the section of the honeycomb cylinder, and then dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 350 C. The final obtained product is one purificant of present invention.

Example 17

[0074] A preparation method of said purificant: add 0.1% (by mass) of palladium powder to the product after the mixing reaction in above example 3 together with porous alumina particles (about 3 mm in diameter) with the same volume of the product. After mixing reaction, the mixture is dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 300 C. The final obtained solid product is one purificant of present invention.

Example 18

[0075] A preparation method of the purificant: add calcium sulfate dihydrate as a molding agent to the product after the mixing reaction in above example 14, the dosage of calcium sulfate dihydrate is about 15% of the weight of total material. After mixing reaction, the mixture is preformed to the shape of honeycomb cylinder as the same dimension as in example 16, and then dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 350 C. The final obtained product is one purificant of present invention.

Example 19

[0076] A circulating fluidized bed gas-solid reactor is shown in FIG. 1. The reactor comprises a column body (4), a gas inlet (1) which is provided at the lower part of the column body, and a purificant adding port (3) is arranged in the middle part of the column body. A gas stream distributor (2) is arranged above the gas inlet in the column. The upper part of the column body is provided with a connecting pipe (5), which is communicated with a gas-solid separator (7); the upper part of the gas-solid separator is provided with a gas outlet (6), and the bottom of the gas-solid separator is provided with a purificant discharge port (9) and a purificant return port (8) connects to the column body; the lower part and the bottom of the column body are provided with an inspection port (10) and a bottom purificant discharge port (11), respectively.

[0077] The treatment process is carried out by introducing the gas stream from the gas inlet (1) into the column body (4) through the gas distributor (2) and the purificant particles into the column body (4) through the purificant adding port (3) as well. With the mixing of gas and solid particles in the column, the gas-solid adsorption reaction takes place, and nitrogen oxide in gas stream is adsorbed by the purificant. Then the mixture of gas and solid products are led into the gas-solid separator (7) through the connecting pipe (5) for gas-solid separation, and then the cleaned gas stream is discharged from the gas outlet (6), and a part of unreacted purificant particles discharged from gas-solid separator (7) may be fed back to the column body (4) through the purificant return port (8) to participate in the gas-solid reaction again, and the remaining part of the particles may be discharged through the purificant discharge port 9. A bottom purificant discharge port (11) is also provided for discharging excess solid particles in the column.

[0078] The dimension of the circulating fluidized bed gas-solid reactor is 60 mm in diameter and 2500 mm in height, using 316L stainless steel as the material. The gas stream is composed of oxygen about 8% by volume, moisture about 10% by volume, nitrogen oxides (containing about 95% NO) 500 ppm, and the balance nitrogen gas. The gas flow rate is about 5 m.sup.3/h (gas-solid contact time in the column is estimated from about 0.05 s to 3 s). The purificants prepared in examples 1-15 are respectively used, and the average particle diameter of the purificant is about 0.5 mm. The amount of the purificant added into the reactor by a mechanical metering feeder with a feeding rate of about 2-3 kg/h, and the temperature of the purificant after imported is the same as the temperature of the gas in the reactor. The product particles separated by the gas-solid separator (cyclone separator) are not returned to the reactor.

[0079] When the temperatures of gas stream introduced to the column are 100 C., 250 C., 350 C., 450 C. and 550 C., respectively, the experimental results show the gas outlet NO.sub.x concentrations (in ppm, same below) are: 461, 422, 381, 390 and 423 (example 1); 442, 323, 193, 101 and 283 (example 2); 423, 235, 71, 57 and 225 (example 3); 416, 215, 65, 56 and 245 (example 4); 395, 154, 55, 43 and 265 (example 5); 422, 147, 60, 56 and 216 (example 6); 466, 234, 197, 239 and 296 (example 7); 419, 193, 45, 29 and 231 (example 8); 396, 149, 53, 47 and 263 (example 9); 392, 187, 53, 42, and 255 (example 10); 393, 194, 57, 51 and 235 (example 11); 436, 210, 73, 87 and 263 (example 12); 425, 233, 64, 66 and 252 (using ferric sulfate, example 13); 195, 223, 54, 61 and 222 (using ferrous chloride, example 13); 215, 243, 74, 91 and 262 (using ferric chloride, example 13); 442, 247, 76, 81 and 293 (using cobalt chloride, example 13); 412, 207, 66, 78 and 305 (using manganese chloride, example 13); 395, 177, 56, 80 and 335 (using copper chloride, example 13); 411, 177, 56, 48 and 231 (example 14); 415, 217, 67, 54 and 212 (example 15).

Example 20

[0080] A countercurrent moving bed gas-solid reactor is shown in FIG. 2. It comprises a column body (4), a gas inlet (1) which is arranged at a lower part of the column body, a purificant adding port (3) and a gas outlet (6) which are separately arranged at the upper part of the column body, and a purificant discharge port (9) which is provided at the bottom of the column. The gas inlet (1) is communicates with the gas outlet through a gas-solid reaction zone (12) in the column, and the purificant adding port (3) is communicates with purificant discharge port (9) through the gas-solid reaction zone (12) and a purificant recovery zone (13). The column body (4) has a diameter of 60 mm and a height of 1500 mm, using 316L stainless steel as the material, and an effective height of the gas-solid reaction zone (12) is about 1000 mm.

[0081] The treatment process is carried out by introducing the gas stream from the gas inlet (1) into the column body (4) and the purificant particles into the column body (4) through purificant adding port (3) as well. With the mixing of gas and purificant particles in the gas-solid reaction zone (12), the gas-solid adsorption reaction between nitrogen oxides and purificant takes place. The purified gas is then discharged from gas outlet (6), and the solid particles after reaction are discharged from the purificant discharge port (9) through the purificant recovery zone (13).

[0082] The carrier gas is air at room temperature, and the relative humidity of air is about 70%. The concentration of nitrogen monoxide in the gas stream is about 450 ppm, and the gas flow rate is about 1 m.sup.3/h, and the gas-solid contact time in the reactor is about 3 to 15 s. The purificant with an average particle diameter of about 0.5 mm prepared in example 5 was adopted, and the addition amount of the purificant is about 2 kg/h. When the temperatures of gas stream in the reactor were about 60 C., 250 V, 350 C. and 450 C., respectively, the experimental results showed that the NO concentration (ppm) of the gas outlet was 435, 43, 12 and 35, respectively.

Example 22

[0083] A fixed bed gas-solid adsorption reactor is shown in FIG. 3. It comprises a column body (4), a gas inlet (1) which is provided at the lower part of the column body, a gas flow distributor (2) which is arranged above the gas inlet in the column body, a purificant filling layer (14) which is arranged above the gas flow distributor, a purificant adding port (3) which is arranged above the purificant filling layer, a purificant discharge port (9) which is arranged at the lower part of the purificant filling layer, and a gas outlet (6) at the upper part of the column body. The gas inlet (1) communicates with the gas outlet (6) through the gas flow distributor (2) and the void of the purificant filling layer (14). The column body (4) has a diameter of 60 mm and a height of 1500 mm, using 316L stainless steel as the material.

[0084] The treatment process is carried out by introducing the nitrogen oxide-containing gas stream from the gas inlet (1) to the purificant filling layer (14) through the gas flow distributor (2). In the purificant filling layer (14), the gas-solid adsorption reaction between nitrogen oxide and the purificant takes place. The purified gas stream is discharged from the gas outlet (6) at the upper part of the reactor, and the used purificant can be periodically discharged from the purificant discharge port (9).

[0085] Two kinds of molded purificants of alumina supported purificant and honeycomb purificant prepared in examples 16 to 18 were used, respectively. The bulk density of both purificants is about 1500 kg/m.sup.3, and the filling height of the purificant in the reactor was about 200 mm, and the outer wall of the reactor was heat insulated.

[0086] A simulating gas stream of automobile exhaust gas was tested, wherein the concentration of the pollutants in the gas stream are about 350 ppm of nitric oxide (NO), about 50 ppm of sulfur dioxide, 10% of carbon dioxide (volume, the same below), about 150 mg/m.sup.3 of carbon monoxide and hydrocarbons, and oxygen content of 1%. The gas flow rate is about 1.5 m.sup.3/h with a gas residence time of about 0.3 s to 3 s. When the temperatures of gas stream into the reactor are about 150 C., 300 C., 400 C. and 550 C., respectively, the experimental results of the gas outlet concentrations of pollutants are as follows: Using the honeycomb purificant in example 16, NO.sub.x concentrations (ppm) are about 322, 275, 265 and 285; SO.sub.2 concentrations (ppm) are about 42, 55, 43 and 46; carbon monoxide and hydrocarbon concentration (mg/m.sup.3) are about 66, 25, 0 and 0. Using alumina supported purificant in example 17, NO.sub.x concentrations (ppm) are about 276, 125, 106, and 202; SO.sub.2 concentration (ppm) are about 15, 18, 40, and 47; carbon monoxide and hydrocarbon concentrations (mg/m.sup.3) are about 57, 4, 0, and 0. Using the honeycomb purificant in example 18, the gas outlet concentrations were NO.sub.x (ppm) of about 182, 33, 42 and 175, SO.sub.2 (ppm) of about 9, 12, 35 and 45, respectively, and the concentration of both carbon monoxide and hydrocarbon (mg/m.sup.3) are about 31, 1, 0, and 0, respectively. Since the amount of the purificant added to the reactor is fixed, the removal of the harmful substances in gas stream may be varied with the consumption of the purificant, and the concentrations showed above is the value when the maximum removal is achieved.

Example 23

[0087] In the reactor of example 22, the purificant particles of example 14 after used in the test of example 19 was regenerated in air. The gas flow rate of air stream is about 1 m.sup.3/h; the temperature of gas stream in the reactor is about 600 C., and the regenerating time is about 1 hour. The regeneration is completed when the outlet gas composition no longer changes.

Example 24

[0088] In the reactor of example 22, the honeycomb purificant of example 18 after used in the test of example 22 was regenerated in nitrogen gas. The gas flow rate of the gas stream is about 1 m.sup.3/h with 1% carbon monoxide as a reducing agent. The temperature of the gas stream in the reactor is about 750 C., and the reaction time is about 1 hour. The regeneration is completed when the outlet gas composition no longer changes.

Example 25

[0089] A preparation method of the purificant: add ferrous sulfate heptahydrate, calcium oxide and water to a mixing reactor at a ratio of about 1:2:1. After the mixing reaction, the product is then dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 750 C. with 0.5% of methane as a reducing agent. When the gas component in gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 26

[0090] A preparation method of the purificant: add copper sulfate pentahydrate, barium hydroxide and water to a mixing reactor at a ratio of about 1:1.5:1. After the mixing reaction the product is then dried and activated in air sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 500 C. When the gas component in gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 27

[0091] A preparation method of the purificant: add manganese sulfate tetrahydrate, calcium carbonate and water to a mixing reactor at a ratio of about 1:1:2. After the mixing reaction, the product is then dried and activated in air sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 450 C. When the gas component in gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 28

[0092] A preparation method of the purificant: add ferrous carbonate, manganese carbonate and basic copper carbonate to a mixed reactor with magnesium hydroxide, sodium sulfate and water at a ratio of about 1:2:1:6, respectively. After the mixing reaction, the product is then dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 550 C. When the gas component in gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 29

[0093] A preparation method for the purificant: each solution (about 50% water) of the solution of ferric sulfate, ferrous chloride, ferric chloride, cobalt chloride, manganese chloride and copper chloride is respectively mixed with calcium oxide in a mixing reactor at a ratio of about 1:3. After the mixing reaction, the product is then dried and activated in nitrogen gas sequentially. The other operation procedure is the same as in example 26, and the obtained solid product is one purificant of present invention.

Example 30

[0094] A preparation method of the purificant: add ferrous sulfate heptahydrate, cobalt sulfate heptahydrate, manganese sulfate tetrahydrate, copper sulfate pentahydrate and calcium oxide to a mixing reactor at a ratio of about 1:1:1:1:6. The other operation procedure is the same as in example 28, and the obtained solid product is one purificant of present invention.

Example 31

[0095] A preparation method of said purificant: add clay as a molding agent to the product after the mixing reaction in above example 29 with a dosage of about 30% of the weight of total material. After completely mixing, the mixture is preformed to the shape of honeycomb cylinder with the same dimensions in example 16, and then dried and activated in nitrogen gas sequentially. The drying temperature is about 150 C. and lasting for about 1 hour. The activating temperature is about 550 C. The final obtained product is one purificant of present invention.

Example 32

[0096] The reactor is the same as used in example 19. The purificants prepared in examples 25-30 are adopted, which have an average particle diameter of about 0.5 mm, and the amount of purificant added to the reactor is about 2-3 kg/h. Other operating conditions are the same as in example 19. When the temperatures of gas stream introduced to the column are 250 C., 350 C., 450 C. and 550 C., respectively, the results show the gas outlet NO.sub.x concentrations (ppm) are: 320, 122, 81 and 393 (example 25); 310, 102, 75 and 380 (example 26); 336, 149, 105 392 (example 27); 305, 123, 71 and 315 (using ferrous carbonate, example 28); 295, 113, 65 and 285 (using manganese carbonate, example 28); 285, 103, 51 and 290 (using basic copper carbonate, example 28); 325, 143, 94 and 320 (using iron sulfate, example 29); 312, 127, 89 and 313 (using ferrous chloride, example 29); 321, 135, 92 and 331 (using ferric chloride, example 29); 341, 167, 121 and 335 (using cobalt chloride, example 29). 290, 87, 89 and 333 (using manganese chloride, example 29); 289, 83, 95 and 353 (using copper chloride, example 29); and 285, 68, 66 and 315 (example 30).

Example 33

[0097] The reactor is the same as used in example 20. The concentration of nitric oxide in the gas stream is about 450 ppm, and the concentration of sulfur dioxide is about 500 ppm, and the gas flow rate is about 1 m.sup.3/h. the purificant prepared in examples 30 is adopted, which has an average particle diameter of about 0.5 mm, and the amount of addition is about 2-3 kg/h. Other operating conditions are the same as in the example 20. When the inlet gas temperature is 150 C., 300 C., 450 C. and 600 C., the result shows that NO.sub.x concentration (in ppm) of the gas outlet is 190, 62, 45 and 335, respectively, and the concentration of SO.sub.2 (in ppm) is 169, 265, 355 and 475, respectively.

Example 34

[0098] The reactor is the same as used in example 22. The purificant prepared in example 31 is adopted. Other operating conditions are the same as in the example 22. When the inlet gas temperature is 150 C., 300 C., 450 C. and 600 C., the gas outlet concentrations of pollutants are 195, 72, 65 and 225 for NO.sub.x (ppm), respectively, and 10, 17, 35 and 46 for SO.sub.2 (ppm), respectively, and 65, 8, 0, and 0 for carbon monoxide and hydrocarbon (mg/m.sup.3), respectively.

Example 35

[0099] In the reactor of example 22, the purificant particles of example 30 after used in the test of example 32 was regenerated in air. The gas flow rate of air stream is about 1 m.sup.3/h; the temperature of gas stream in the reactor is about 600 C., and the regenerating time is about 1 hour. The regeneration is completed when the outlet gas composition no longer changes.

Example 36

[0100] In the reactor of example 22, the purificant of example 31 after use was regenerated in nitrogen gas. The gas flow rate is about 1 m.sup.3/h with a reducing gas of 0.5% methane. The temperature of the gas stream in the reactor is about 700 C., and the reaction time is about 2 hours. The regeneration is completed when the outlet gas composition no longer changes.

Example 37

[0101] A preparation method of said purificant: add ferrous sulfate heptahydrate, cobalt sulfate heptahydrate, manganese sulfate tetrahydrate and copper sulfate pentahydrate respectively to a mixed reactor with potassium hydroxide and calcium oxide at a ratio of about 1:1:3. After the mixing reaction, the product is then dried and activated in nitrogen gas sequentially. Drying temperature is about 40 to 60 C. and lasting for about 3 hours. Activating temperature is about 550 C. When the gas component in gas stream is no longer changed, the activation process is completed, and the obtained solid product is one purificant of present invention.

Example 38

[0102] A preparation method of said purificant: add ferrous sulfate heptahydrate, cobalt sulfate heptahydrate, manganese sulfate tetrahydrate and copper sulfate pentahydrate respectively to a mixed reactor with sodium hydroxide and calcium carbonate at a ratio of about 1:1:3. After the mixing reaction, the product is then dried and activated in air sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 600 C. Other operation procedure is the same with above examples.

Example 39

[0103] A preparation method of said purificant: add ferrous carbonate, manganese carbonate and basic copper carbonate respectively to a mixing reaction with potassium hydroxide, calcium carbonate and water at a ratio of about 1:2:2:6. After the mixing reaction, the product is then dried and activated in nitrogen gas sequentially. Drying temperature is about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 550 C. Other operation procedures are the same with above examples.

Example 40

[0104] A preparation method of said purificant: add iron sulfate, cobalt sulfate heptahydrate, manganese sulfate tetrahydrate and copper sulfate pentahydrate respectively to a mixing reactor with potassium carbonate and water at a ratio of about 1.5:1:3. After the mixing reaction, calcium oxide (10% of the total amount of the product) is added into the mixing reactor as a molding agent. Other operation procedures are the same with example 39.

Example 41

[0105] A preparation method of said purificant: The solution (about 50% water) of ferrous chloride, ferric chloride, cobalt chloride, manganese chloride and copper chloride is mixed with sodium hydroxide and carbonic acid in a mixing reactor at a ratio of about 1:2:2, respectively. After the mixing reaction, the product is then dried and activated in nitrogen gas sequentially. Drying temperature is in the range of about 60 to 95 C. and lasting for about 2 hours. Activating temperature is about 500 C. The final obtained solid product is one purificant of present invention.

Example 42

[0106] A preparation method of the purificant: the products obtained after mixing reaction in example 38 are preformed to honeycomb cylinders with the same dimensions as in example 16, respectively, and then dried and activated in a nitrogen gas, sequentially. Drying temperature is in the range of about 60 to 95 C. and lasting for about 2 hours. Activation temperature is about 650 C. The final obtained product is one purificant of present invention.

Example 43

[0107] The reactor is the same as used in example 19. The purificants prepared in examples 37-41 are adopted, which have an average particle diameter of about 0.5 mm, and the amount of purificant added to the reactor is about 2-3 kg/h. The concentration of carbon dioxide in gas stream is about 10% by volume and other operating conditions are the same as in example 19. When the temperatures of gas stream introduced to the column are 250 C., 350 C. and 450 C., respectively, experimental result shows that the NO.sub.x concentrations (ppm) at gas outlet are: 251, 65, and 93 (using ferrous sulfate heptahydrate in example 37); 276, 85 and 103 (using cobalt sulfate heptahydrate in example 37); 191, 55 123 (using manganese sulfate tetrahydrate in example 37); 201, 52 and 115 (using copper sulfate pentahydrate in example 37); 195, 55 and 82 (using ferrous carbonate in example 39); 172, 49 and 113 (using manganese carbonate in example 39); 167, 42 and 95 (using basic copper carbonate, example 39); 265, 85 and 143 (using iron sulfate in example 40); 286, 95 and 163 (using cobalt chloride in example 40); 201, 65 and 133 (using manganese sulfate tetrahydrate in example 40); 191, 62 and 145 (using copper sulfate pentahydrate in example 40). When the purificants of example 38 are used, the effects are approximately the same as the purificants of example 37, but lasting longer. When the purificants of example 41 are used, the effects are approximately the same as the purificant of example 38.

Example 44

[0108] The reactor is the same as used in example 20. The pollutant-carrying gas is a simulated flue gas. The composition of the sample gas is 450 ppm of NO, 500 ppm of SO.sub.2, 10% of CO.sub.2, and 10% water content. The gas flow rate is about 1.5 m.sup.3/h. The purificants prepared in example 38 are adopted, which has an average particle diameter of about 0.5 mm, and the amount of addition is about 2-3 kg/h. Other operating conditions are the same as in the example 20. When the inlet gas temperatures are 200 C., 300 C. and 400 C., the gas outlet concentrations of NO.sub.x and SO.sub.2 (in ppm) are: 220, 85 and 95 (NO.sub.x), and 151, 105 and 343 (SO.sub.2), respectively, when ferrous sulfate heptahydrate is used; 195, 55 and 90 (NO.sub.x), 145, 95 and 325 (SO.sub.2), respectively, when manganese sulphate tetrahydrate is used; 165, 45 and 86 (NO.sub.x), 171, 125 and 363 (SO.sub.2), respectively, when copper sulfate pentahydrate is used.

Example 45

[0109] The reactor is the same as used in example 22. The purificant prepared in example 42 is adopted. Other operating conditions are the same as in the example 22. When the inlet gas temperatures are 150 C., 250 C., 350 C. and 450 C., the minimum gas outlet concentrations of pollutants are: 172, 75 55 and 65 for NO.sub.x (ppm), 7, 16, 36 and 46 for SO.sub.2 (ppm), and 52, 10, 0 and 0 for carbon monoxide and hydrocarbon (mg/m.sup.3) (using ferrous sulfate heptahydrate as a material), respectively; 205, 145, 95 and 85 for NO.sub.x (ppm), 8, 18, 37 and 47 for SO.sub.2 (ppm), and 55, 15, 0 and 0 for carbon monoxide and hydrocarbon (mg/m.sup.3) (using cobalt sulphate heptahydrate as a material), respectively; 162, 55, 45 and 65 for NO.sub.x (ppm), 5, 10, 26 and 457 for SO.sub.2 (ppm), and 37, 5, 0 and 0 for carbon monoxide and hydrocarbon (mg/m.sup.3) (using manganese sulfate tetrahydrate ferrous as a material), respectively; 152, 45, 35 and 45 for NO.sub.x (ppm), 6, 15, 30 and 46 for SO.sub.2 (ppm), and 32, 5, 0 and 0 for carbon monoxide and hydrocarbon (mg/m.sup.3) (using copper sulfate pentahydrate as a material), respectively.

Example 46

[0110] In the reactor of example 22, the used honeycomb purificants prepared in example 42 are regenerated in nitrogen gas. The gas flow rate is about 1 m.sup.3/h, and with 1% methane in the gas stream as reducing agent. The temperature of the gas stream in the reactor is about 750 C., and the regeneration time is about 2 hours.

Example 47

[0111] In the reactor of example 22, the used purificant particles of example 42 in example 43 were regenerated in air. The gas flow rate of air stream is about 1 m.sup.3/h. The temperature of gas stream in the reactor is about from 500 to 700 C. (some different for different purificants) and the regeneration time is about 1 hour.

Example 48

[0112] A preparation method of the purificant: dissolve ferrous acetate, ferric nitrate, manganese nitrate and cobalt acetate in water, respectively, and then add sodium hydroxide into above solutions at a mole ratio of 2:1 to obtain metal hydroxides respectively. After filtration to remove water layer, the precipitate is mixed with calcium oxide in an equal molar amount. After mixing reaction, the product is preformed to honeycomb cylinder with the same dimensions as in example 16, and then dried and activated in air. Drying temperature is about 60-95 C. lasting about 2 hours, and activating temperature is about 600 C. The final obtained product is one purificant of present invention, and the effect is equivalent to the similar purificants.

Example 49

[0113] A preparation method of the purificant: add ferrous hydroxide, iron hydroxide, manganese hydroxide, cobalt hydroxide, copper hydroxide and cuprous hydroxide respectively to a mixing reactor with sodium sulfate, calcium oxide and water at a ratio of about 1:1:3:6. Other operation procedures are the same with example 39.

Example 50

[0114] The reactor is the same as used in example 19. The purificants prepared in example 49 are adopted, which have an average particle diameter of about 0.5 mm, and the amount of purificant added to the reactor is about 2-3 kg/h. Other operating conditions are the same as in example 19. When the temperatures of gas stream introduced to the column are 250 C., 350 C. and 450 C., respectively, the NO.sub.x concentrations (ppm) of gas outlet are: 241, 145, and 93 (using ferrous hydroxide as a material); 262, 160 and 85 (using iron hydroxide as a material); 181, 72 96 (using manganese hydroxide as a material); 267, 155 and 136 (using cobalt hydroxide as a material); 191, 65 and 112 (using copper hydroxide as a material); 187, 57 and 119 (using cuprous hydroxide as a material).

Example 51

[0115] A preparation method of said purificant: add ferrous hydroxide, iron hydroxide, manganese hydroxide, cobalt hydroxide, copper hydroxide and cuprous hydroxide respectively to a mixing reactor with sodium sulfate, calcium carbonate and water at a ratio of about 1:1:3:6. Other operation procedures are the same with example 42. The final obtained product is one purificant of present invention, and the effect is equivalent to that of similar purificants.

Example 52

[0116] A preparation method of said purificant: add ferrous hydroxide, iron hydroxide, manganese hydroxide, cobalt hydroxide, copper hydroxide and cuprous hydroxide respectively to a mixing reactor with sodium chloride, calcium carbonate and water at a ratio of about 1:1:3:6. Other operation procedures are the same with example 39 (activating temperature is about in the range of 500 to 600 C.). The final obtained product is one purificant of present invention.

Example 53

[0117] The reactor is the same as used in example 22. The purificants prepared in example 52 are adopted. Other operating conditions are the same as in the example 22. When the inlet gas temperatures are 250 C., 350 C. and 450 C., the minimum gas outlet concentrations of pollutants are: 191, 76 and 85 for NO.sub.R (ppm, the same below), 16, 26 and 46 for SO.sub.2 (ppm, the same below), and 25, 0 and 0 for carbon monoxide and hydrocarbon (mg/m.sup.3, the same below) (using ferrous hydroxide as a material), respectively; 205, 81 and 95 for NO.sub.R, 17, 29 and 47 for SO.sub.2, and 27, 0 and 0 for carbon monoxide and hydrocarbon (using ferric hydroxide as a material), respectively; 115, 45 and 65 for NO.sub.R, 5, 11, 25 and 42 for SO.sub.2, and 15, 0 and 0 for carbon monoxide and hydrocarbon (using manganese hydroxide as a material), respectively; 195, 81 and 85 for NO.sub.R, 21, 36 and 47 for SO.sub.2, and 25, 0 and 0 for carbon monoxide and hydrocarbon (using cobaltous hydroxide as a material), respectively. 93, 35 and 58 for NO.sub.R, 21, 35 and 46 for SO.sub.2, and 15, 0 and 0 for carbon monoxide and hydrocarbon (using copper hydroxide as a material), respectively; 85, 26 and 55 for NO.sub.R, 20, 31 and 46 for SO.sub.2, and 16, 0 and 0 for carbon monoxide and hydrocarbon (using cuprous hydroxide as a material), respectively.

Example 54

[0118] In the reactor of example 22, the honeycomb purificants after use in example 53 are regenerated in nitrogen gas. The operation conditions are the same as in example 46. When the gas components in the gas stream no longer change, regeneration is completed.

Example 55

[0119] A preparation method of the purificant: add iron hydroxide, manganese hydroxide, cupric tetramminohydroxide and cobalt tetraamminohydroxide respectively to a mixing reactor with calcium carbonate and water at a ratio of about 1:3:4. Other operation procedures are the same with example 42, except that the activation temperature is 500 C. The final obtained product is one purificant of present invention, and the effect is equivalent to similar purificants.

Example 56

[0120] The reactor is the same as used in example 22. The purificants prepared in example 55 are adopted. Other operating conditions are the same as in the example 22. When the inlet gas temperatures are 250 C., 350 C. and 450 C., the minimum gas outlet concentrations of pollutants are: 225, 110 and 145 for NO.sub.R (ppm, the same below), 25, 31 and 45 for SO.sub.2 (ppm, the same below), and 36, 7 and 0 for carbon monoxide and hydrocarbon (mg/m.sup.3, the same below) (using ferric hydroxide as a material), respectively; 195, 69 and 115 for NO.sub.R, 15, 30 and 43 for SO.sub.2, and 25, 6 and 0 for carbon monoxide and hydrocarbon (using manganese hydroxide as a material), respectively; 255, 161 and 185 for NO.sub.R, 15, 27 and 45 for SO.sub.2, and 31, 10 and 0 for carbon monoxide and hydrocarbon (using cobalt tetraamminohydroxide as a material), respectively. 193, 85 and 188 for NO.sub.R, 20, 32 and 46 for SO.sub.2, and 23, 5 and 0 for carbon monoxide and hydrocarbon (using cupric tetramminohydroxide as a material), respectively.

Example 57

[0121] A preparation method of the purificant: add ferrous hydrogen carbonate, iron carbonate, oxy basic ferric sulfate, basic manganese chloride, basic cobalt sulfate, and polyaluminium ferric chloride respectively to a mixing reactor with sodium carbonate, calcium silicate and water at a ratio of about 1:2:1:6. Other operation procedures are the same with example 42. The final obtained product is one purificant of present invention, and the effect is equivalent to similar purificants.

Example 58

[0122] The reactor is the same as used in example 22. The purificants prepared in example 57 are adopted. Other operating conditions are the same as in the example 22. When the inlet gas temperatures are 200 C., 300 C. and 400 C., the minimum gas outlet concentrations of pollutants are: 147, 61 and 85 for NOx (ppm, the same below), 21, 37 and 45 for SO.sub.2 (ppm, the same below), and 55, 35 and 10 for carbon monoxide and hydrocarbon (mg/m.sup.3, the same below) (using ferrous hydrogen carbonate as a material), respectively; 175, 90 and 108 for NO.sub.R, 25, 38 and 46 for SO.sub.2, and 65, 36 and 12 for carbon monoxide and hydrocarbon (using iron carbonate as a material), respectively; 155, 54 and 77 for NO.sub.R, 20, 34 and 43 for SO.sub.2, and 55, 35 and 10 for carbon monoxide and hydrocarbon (using oxy basic ferric sulfate as a material), respectively; 138, 51 and 75 for NO.sub.R, 15, 25 and 39 for SO.sub.2, and 35, 20 and 0 for carbon monoxide and hydrocarbon (using basic manganese chloride as a material), respectively; 168, 73 and 90 for NO.sub.R, 29, 36 and 46 for SO.sub.2, and 53, 30 and 12 for carbon monoxide and hydrocarbon (using basic cobalt sulfate as a material), respectively; 263, 105 and 176 for NO.sub.R, 25, 40 and 48 for SO.sub.2, and 87, 52 and 220 for carbon monoxide and hydrocarbon (using polyaluminium ferric chloride as a material), respectively. The regeneration of the used purificant is the same with above examples.

Example 59

[0123] A preparation method of the purificant: add ammonium ferrous sulfate, ammonium cobalt chloride, ammonium manganese chloride, cuprous chloride, polyferric aluminum sulfate, potassium iron sulfate, and cupric tetramminosulfate ferrous to a mixing reactor with sodium hydroxide, calcium oxide and water at a ratio of about 1:1:3:6, respectively. Other operation procedures are the same with example 42, except that the activation temperature is 550 C. The final obtained product is one purificant of present invention.

Example 60

[0124] The reactor is the same as used in example 22. The purificants prepared in example 59 are adopted. Other operating conditions are the same as in example 22. When the inlet gas temperatures are 250 C., 350 C. and 450 C., the minimum gas outlet concentrations of pollutants are: 248, 73 and 83 for NO.sub.R (ppm, the same below), 22, 25 and 45 for SO.sub.2 (ppm, the same below), and 55, 20 and 1 for carbon monoxide and hydrocarbon (mg/m.sup.3, the same below) (using ammonium ferrous sulfate as a material), respectively; 265, 88 and 92 for NO.sub.R, 25, 31 and 46 for SO.sub.2, and 49, 21 and 1 for carbon monoxide and hydrocarbon (using ammonium cobalt chloride as a material), respectively; 191, 54 and 79 for NO.sub.R, 23, 30 and 41 for SO.sub.2, and 41, 15 and 0 for carbon monoxide and hydrocarbon (using ammonium manganese chloride as a material), respectively; 185, 52 and 78 for NO.sub.R, 27, 35 and 45 for SO.sub.2, and 35, 12 and 0 for carbon monoxide and hydrocarbon (using cuprous chloride as a material), respectively; 278, 161 and 155 for NO.sub.R, 29, 37 and 47 for SO.sub.2, and 65, 33 and 5 for carbon monoxide and hydrocarbon (using polyferric aluminum sulfate as a material), respectively; 258, 143 and 160 for NO.sub.R, 29, 39 and 48 for SO.sub.2, and 63, 35 and 7 for carbon monoxide and hydrocarbon (using potassium iron sulfate as a material), respectively; 191, 67 and 86 for NO.sub.R, 25, 33 and 45 for SO.sub.2, and 56, 25 and 0 for carbon monoxide and hydrocarbon (using cupric tetramminosulfate ferrous as a material), respectively. The regeneration of the used purificant is the same with in above examples.

[0125] It should be noted that the above embodiments are merely illustrative of the technical aspects of the present invention, and the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that the technical solutions recited in the embodiments may be modified within the spirit and principles of the present invention, or any equivalent of any of the technical features therein may be replaced, modified, changed and improved, are to be included within the scope of the present invention.