The present invention relates to a method for removing sulphur dioxide from gaseous effluent, wherein a mixture of gaseous outlet gasses or gaseous effluent includes sulphur dioxide and carbon monoxide, and wherein, to perform a catalytic reduction, a catalyst is used to catalyze a reaction between carbon monoxide and sulphur dioxide to produce carbon dioxide and sulphur.

A process plant for production of sulfuric acid from a process gas comprising SO2, including a process gas inlet, a first SO2 converter having an inlet and an outlet, a first condenser having a gas inlet, a gas outlet and a liquid outlet, a gas mixing device having a first inlet, a second inlet and an outlet, a process gas heater having an inlet and an outlet, a second SO2 converter having an inlet and an outlet, a second condenser having a gas inlet, a gas outlet and a liquid outlet, one or more means for cooling and storage of sulfuric acid and a purified process gas outlet.

The invention relates to a continuous process for purifying a gas containing 60-99 percent SO.sub.2 (sulfur dioxide) by volume and 1 to 40 percent steam by volume, followed by synthesis of SO.sub.3 (sulfur trioxide) without first drying the gas, and to an apparatus for carrying out said method.

A method and apparatus for cleaning and recycling stack gas from coal-fired power plants, from natural or propane burning heating plants, or from cement kilns by using renewable catalysts of zeolite to separate pollutants into recyclable and reusable materials. The method reduces from the stack gas carbon monoxide (CO), carbon dioxide (CO.sub.2), nitrogen oxide (NOx), sulfur oxide (SOx) as well as halogens such as chloride and fluorides and trace metals particularly, mercury, lead, and zinc.

SETR tail gas treating process refers to an innovative process consist of the adsorbent and regeneration reactors. The SETR reactor stands for Super Enhanced Tail gas Recovery switching between adsorption and regeneration mode and the STER reactors are located after the tail gas incineration before the stack replacing any type of the caustic scrubber system. The SETR innovative process is not a sub dew point process where the bed become saturated with sulfur, instead, the SETR process are fixed bed reactors that requires heat up and cool down for the SO2 adsorption-based Claus tail gas process. The adsorption mode operates at cold temperature to adsorb the SO2. The regenerator mode operates at hot temperature to regenerate the SO2 by adding a slip stream of the H2S and air from the SRU to the SETR reactor that contains adsorbed SO2 to promote the Claus reaction. In the SETR reactors H2S to react with the adsorbed SO2 in the bed with oxygen the outlet of the hot reactor is recycled to the SRU thermal or catalytic section. The gas stream from the adsorbed cold reactor flows to the stack and it is SO2 free and zero emission is achieved.

A flue-gas purification system includes a flue-gas cycling system, a reactor, and an absorbent adding system having at least a catalytic absorbent, wherein the catalytic absorbent is being gasified for reacting with the flue-gas in the reactor in a homogenous gas-gas phase reacting manner. Therefore, the purification system has fast reaction rate between the pollutants of the flue-gas and the catalytic absorbent, which is preferably ammonia, to efficiently remove pollutants, so as to effectively purify the flue-gas.

A system for reducing SO.sub.2 emissions comprises a hydrogenation reactor, a tail gas cooler, a contact condenser, a hydrolysis reactor, and an absorber. The hydrogenation reactor is configured to receive a Claus tail gas and convert at least a portion of SO.sub.2 in the Claus tail gas to H.sub.2S to produce a hydrogenated Claus tail gas stream. The hydrolysis reactor is configured to convert at least a portion of COS to H.sub.2S. The absorber comprises an amine-based solvent and is configured to absorb at least a portion of the H.sub.2S and recycle the H.sub.2S to the Claus plant.

A method for treating sulfur-containing exhaust gases is provided, comprising the following steps: step i): mixing the sulfur-containing exhaust gases, air, and a hydrocarbon fuel, and controlling a reaction between the air and the hydrocarbon fuel therein, to obtain a procedure gas stream comprising the sulfur-containing exhaust gases, hydrogen, and carbon oxides; step ii): controlling a hydrogenation reaction between the hydrogen contained in the procedure gas stream and a sulfur-containing substance in the sulfur-containing exhaust gases, to obtain hydrogenated tail gases containing hydrogen sulfide; and step iii): absorbing the hydrogen sulfide contained in the hydrogenated tail gases with an absorbing agent to obtain purified tail gases.

The present invention belongs to the flue gas desulfuration field. Specifically, the present invention relates to a supported solid-phase catalyst for oxidizing the by-product magnesium sulfite in a magnesium desulfuration process, and to preparation method and use thereof. The catalyst uses an activated carbon particle as a support, and cobalt nitrate, manganese nitrate, copper nitrate and ferrous nitrate as catalytically active components. The preparation method is as follows: mixing the pre-treated activated carbon support with the catalytically active components, followed by oscillating, standing under microwave irradiation, filtrating, drying, baking, so as to obtain the supported solid-phase catalyst. Raw materials of the present invention are inexpensive and easily available; the preparation process is simple; the catalyst has prominent catalytic effect and can be widely used in the magnesium desulfuration process in medium-sized and small-sized boilers of 75t or more to improve the recovery rate of the desulfuration by-product and reduce energy consumption of the oxidation system; the catalyst has a low amount of catalytically active components and causes low residue in the solution and hence no secondary pollution problem, and has a high generalization value.

A catalyst for simultaneously reducing both SOx and NOx in flue gas and a preparation method and use thereof are provided. They catalyst contains a support or inorganic oxide matrix, a rare earth metal, a non-precious metal selected from Group VIII, or non-precious metal(s) selected from Groups VB, VIII, IB, and IIB, a precious metal, an optional Group VIIB non-precious metal, and an optional Group IIA metal. Contacting the flue gas with the catalyst simultaneously reduces both SOx and NOx in the flue gas.