The present invention relates to a purification method and a purification apparatus for off-gas. More specifically, the present invention relates to a purification method and a purification apparatus for off-gas, capable of lowering the concentration of hydrogen chloride and separating high-purity hydrogen from the off-gas, which is discharged after performing a polysilicon deposition process by a chemical vapor deposition reaction.

The present invention discloses a preparation method for an activated coke catalyst capable of simultaneously removing NO, SO.sub.2, and HCl. The method includes: step 1: crushing and sieving activated coke to obtain coke particles with a particle size of 40-60 microns; step 2: putting the activated coke in an oxidizing agent, stirring at 80 C. for 8 h to allow for a thorough mixing and reaction, washing the activated coke obtained after the reaction until a neutral pH is reached, and drying to obtain activated coke with oxygen-containing functional groups; and step 3: impregnating, by equivalent-volume impregnation, the activated coke with oxygen-containing functional groups obtained in step 2 with a copper nitrate trihydrate aqueous solution for 24 h, drying, and putting the activated coke in a resistance furnace, and introducing argon for calcination to obtain the activated coke catalyst capable of simultaneously removing NO, SO.sub.2, and HCl.

[Technical Problem] To provide a chlorine gas decomposition catalyst that can remove chlorine gas contained in, for example, exhaust gas, with high efficiency, and is less likely to reduce catalyst components when used.

[Solution to Problem] A chlorine gas decomposition catalyst, including a composite oxide (X) of Al and at least one element M1 selected from the group consisting of Ce and Co.

Provided is a catalyst system capable of removing perfluorinated compounds and nitrous oxide. An exhaust gas is heated in two stages through a heat exchange unit and applied to a heater unit. The heater unit generates a flame to heat the exhaust gas to a high temperature. A catalyst unit is directly connected to a heating space of the heater unit so the heated exhaust gas comes into contact with a catalyst, and the perfluorinated compounds and the nitrous oxide are decomposed in the catalyst unit.

Provided is a catalyst apparatus capable of removing perfluorinated compounds or nitrous oxide through a catalyst. A processing gas is introduced into a heat exchange unit, and an exhaust gas having a higher temperature than the processing gas discharged by a heat exchange action is supplied to a heating part. In the heating part, an exhaust gas capable of reacting with the catalyst may be formed through a simple temperature-raising operation, and the perfluorinated compounds or nitrous oxide are effectively removed by the catalyst unit.

The present invention relates to a method for producing a molding catalyst for obtaining chlorine (Cl.sub.2) through an oxidation reaction of hydrogen chloride (HCl), and more specifically, to a method for producing an oxidation reaction molding catalyst by adding heterogeneous material to a ruthenium oxide (RuO.sub.2)-supported catalyst having titanium oxide (TiO.sub.2) as a supporting body, and molding so as to be usable in a fixed bed reactor to produce chlorine (Cl.sub.2) from hydrogen chloride (HCl).

A method to produce a halogen-depleted gas is described. The method providing a gas derived from and/or including a source of biogas, mixing said gas with a source of hydrogen to produce a processed gas mixture including an acid, and separating said acid from said processed gas mixture. Sulfur, oxygen, carbon dioxide removal processes are integrated into the method. Production of secondary products, and removal thereof, are included. Pre and post processing may be integrated, and production of products is described.

Processes and apparatuses for regenerating catalysts used in a hydrocarbon conversion process. The catalyst is separated into a bypass portion and an adsorption portion. The bypass portion is passed to a regeneration zone where coke may be removed. A vent gas from the regeneration zone may include an active additive from the catalyst, like a halogen. The vent gas is sent to an adsorption zone which also receives the adsorption portion. In the adsorption zone, the catalyst will contact and adsorb the active additive and then pass to the regeneration zone. The amount of active additive in the vent gas from the regeneration zone and the adsorption zone is reduced.

The present invention discloses a preparation method for an activated coke catalyst capable of simultaneously removing NO, SO.sub.2, and HCl. The method includes: step 1: crushing and sieving activated coke to obtain coke particles with a particle size of 40-60 microns; step 2: putting the activated coke in an oxidizing agent, stirring at 80 C. for 8 h to allow for a thorough mixing and reaction, washing the activated coke obtained after the reaction until a neutral pH is reached, and drying to obtain activated coke with oxygen-containing functional groups; and step 3: impregnating, by equivalent-volume impregnation, the activated coke with oxygen-containing functional groups obtained in step 2 with a copper nitrate trihydrate aqueous solution for 24 h, drying, and putting the activated coke in a resistance furnace, and introducing argon for calcination to obtain the activated coke catalyst capable of simultaneously removing NO, SO.sub.2, and HCl.

The present invention relates to a method for producing a molding catalyst for obtaining chlorine (Cl.sub.2) through an oxidation reaction of hydrogen chloride (HCl), and more specifically, to a method for producing an oxidation reaction molding catalyst by adding heterogeneous material to a ruthenium oxide (RuO.sub.2)-supported catalyst having titanium oxide (TiO.sub.2) as a supporting body, and molding so as to be usable in a fixed bed reactor to produce chlorine (Cl.sub.2) from hydrogen chloride (HCl).