The present application solves the existing problem of using very expensive oxidation reagents, such as H.sub.2O.sub.2 and ozone, in removal of NO.sub.x and SO.sub.x from the flue gases, by performing the NO.sub.x and SO.sub.x oxidation with atmospheric oxygen. The combined system for catalytic oxidation and wet-scrubbing of simultaneously both NO.sub.x and SO.sub.x from a flue gas and manufacturing fertilisers, comprises: (a) an air separation unit for separating atmospheric oxygen from air and thereby producing an air stream substantially enriched with atmospheric oxygen for oxidation of NO.sub.x and SO.sub.x, (b) an adsorption and oxidation reactor containing an oxidation catalyst and designed to receive said air stream and a flue gas stream containing NO.sub.x and SO.sub.x, to adsorb said streamed gases, and then to carry out the catalytic oxidation of said NO.sub.x and SO.sub.x by said oxygen to yield nitric and sulphuric acids, (c) a separator and reactor control unit for separation of products and liquids and controlling said catalytic oxidation and wet-scrubbing; and (d) a vessel containing gas or liquid ammonia, connected to said adsorption and oxidation reactor or to said separator and reactor control unit, and streaming said ammonia into the adsorption and oxidation reactor or into the separator and reactor control unit to react with the nitric and sulphuric acids and to yield ammonium nitrate and ammonium sulphate fertilisers.

An air treatment unit may include an air inlet to receive a flow of input air for treatment and a reaction reservoir configured to hold an aqueous air treatment solution. The air treatment unit may also include an air dispersing element flow connected with the air inlet, wherein the air dispersing element is configured to convert at least a portion of the flow of input air into a plurality of microbubbles for introduction into the aqueous air treatment solution, such that an amount of one or more target gas species contained within the plurality of microbubbles is reduced through reaction with the aqueous air treatment solution. The unit may include an air outlet configured to output treated air from the reaction reservoir.

A method and an integrated system for reducing CO.sub.2 emissions in industrial processes. The method and integrated system (100) capture carbon dioxide (CO.sub.2) gas from a first gas stream (104) with a chemical absorbent to produce a second gas stream (106) having a higher concentration of carbon monoxide (CO) gas and a lower concentration of CO.sub.2 gas as compared to first gas stream. The CO gas in the second gas stream is used to produce C.sub.5 to C.sub.20 hydrocarbons in an exothermic reaction (108) with hydrogen (H.sub.2) gas (138). At least a portion of the heat generated in the exothermic reaction is used to regenerate the chemical absorbent with the liberation of the CO.sub.2 gas (128) captured from the first gas stream. Heat captured during the exothermic reaction can, optionally, first be used to generate electricity, wherein the heat remaining after generating electricity is used to thermally regenerate the chemical absorbent.

The present invention provides a method for manufacturing an electro-catalytic honeycomb for controlling exhaust emissions, comprising steps of: providing a honeycomb structural frame including an outer surface, a plurality of airflow channels and a plurality of partition walls, and contacting the outer surface of the honeycomb structural frame with a molten metal to attach the molten metal in the plurality of partition walls to form a reducing environment. Accordingly, through the reducing environment in the partition wall and the oxidizing environment of a lean-burn exhaust contacted by a cathode, the electro-catalytic honeycomb generates an electromotive force between the partition wall and the cathode to drive the nitrogen oxides in the lean-burn exhaust to decompose at the cathode in order to control exhaust emissions.

An improved cluster-supporting catalyst has heteroatom-removed zeolite particles, and catalyst metal clusters supported within the pores of the heteroatom-removed zeolite particles. A method for producing a cluster-supporting catalyst includes the following steps: providing a dispersion liquid containing a dispersion medium and the heteroatom-removed zeolite particles dispersed in the dispersion medium; and in the dispersion liquid, forming catalyst metal clusters having a positive charge, and supporting the catalyst metal clusters within the pores of the heteroatom-removed zeolite particles through an electrostatic interaction.

Method for preparing a catalytic fabric filter comprising the steps of a) providing a fabric filter substrate, preferably consisting of glass fibers, having a gas inlet surface and a gas outlet surface, the gas inlet surface is coated with a polymeric membrane, preferably consisting of polytetrafluoroethylene; b) providing an aqueous impregnation liquid comprising one or more catalyst metal precursor compounds; c) impregnating the fabric filter substrate with the impregnation liquid; and d) drying and thermally activating the impregnated fabric filter substrate at a temperature below 300 C. to convert the one or more metal compounds of the catalyst precursor to their catalytically active form, wherein the drying of the impregnated fabric filter substrate in step d) is performed from the gas outlet surface.

A method and an integrated system for reducing CO.sub.2 emissions in industrial processes. The method and integrated system (100) capture carbon dioxide (CO.sub.2) gas from a first gas stream (104) with a chemical absorbent to produce a second gas stream (106) having a higher concentration of carbon monoxide (CO) gas and a lower concentration of CO.sub.2 gas as compared to first gas stream. The CO gas in the second gas stream is used to produce C.sub.5 to C.sub.20 hydrocarbons in an exothermic reaction (108) with hydrogen (H.sub.2) gas (138). At least a portion of the heat generated in the exothermic reaction is used to regenerate the chemical absorbent with the liberation of the CO.sub.2 gas (128) captured from the first gas stream. Heat captured during the exothermic reaction can, optionally, first be used to generate electricity, wherein the heat remaining after generating electricity is used to thermally regenerate the chemical absorbent.

For purifying waste gas charged with nitrogen oxides in a reactor with heat-accumulator chambers containing heat-accumulator materials, the raw gas to be purified alternately enters one of the heat-accumulator chambers. Mixed with a reducing agent for the reduction of the nitrogen oxides, it is supplied to a catalyst for the reduction of the nitrogen oxides, and the clean gas heats the heat-accumulator material in the heat-accumulator chamber which the clean gas exits. A partial flow is taken therefrom, heated by means of a heat source and, mixed with a reducing agent, supplied again to the heat-accumulator chamber which the raw gas enters. This heated, recirculated gas forms the only heat source for the overall system.

A granule reactor (10), an apparatus comprising said reactor and a method implemented by said apparatus are described for treating polluting agents present in industrial gases, particularly but not only, when such gases comprise NO.sub.x, volatile organic compounds (VOCs), carbon monoxide (CO), hydrocarbons and similar pollutants. The pellet reactor is adapted to be used in the treatment of industrial gases, capable of treating industrial gases and removing particulate from said gases while maintaining a constant efficiency. Moreover, a method of treating the polluting agents present in industrial gases by means of said pellet reactor, and a pellet reactor adapted to implement said method of treatment are described.

A method for cleaning bypass gases of the cement or mineral industry includes cooling down a removed bypass gas from a cement or mineral processing plant to a temperature of between 500 C. and 150 C., and coarsely dedusting the bypass gas, the dust burden being reduced by 30 to 95%. After the dedusting step, the gaseous constituents contained in the partly dedusted bypass gas are reduced in a reducing step. The partly dedusted bypass gas is further finely dedusted. The gaseous constituents reducing step includes at least a catalytic reduction of one or more of nitrogen oxides, hydrocarbons, and carbon monoxide.