CATALYST SYSTEM AND METHOD OF REDUCING NO Russian patent published in 2010 - IPC B01J23/08 B01J21/04 B01J23/24 B01J23/62 B01D53/86 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst system and a method of reducing nitrogen oxide emissions. The described catalyst system for reducing NO_x contains: a catalyst having a support which contains at least one compound selected from a group consisting of aluminium oxide, titanium dioxide, zirconium dioxide, cerium oxide, silicon carbide and mixtures thereof, a catalytic metal oxide containing at least one of gallium oxide or silver oxide and at least one activating metal selected from a group consisting of silver, cobalt, molybdenum, tungsten, indium or mixtures thereof; and a gas stream containing oxygen ranging from approximately 1 mol % to approximately 12 mol % and an organic reducing agent selected from a group consisting of alcohol, carbonate or combinations thereof, where the said organic reducing agent and the said NO_x are present in molar ratio carbon: NO_x ranging from approximately 0.5:1 to approximately 24:1. A catalyst system for reducing NO_x which contains the following is described: a catalyst consisting of (i) metal oxide support which contains aluminium oxide, (ii) at least one of the following oxides: gallium oxide or silver oxide, present in amount ranging from approximately 5 mol % to approximately 31 mol %; and (iii) an activating metal or a combination of activating metals, present in amount ranging from approximately 1 mol % to approximately 22 mol % and selected from a group consisting of silver, cobalt, molybdenum, tungsten, indium and molybdenum, indium and cobalt, and indium and tungsten; and a gas stream containing (A) water in range from approximately 1 mol % to approximately 12 mol %; (B) oxygen in the range from approximately 1 mol % to approximately 15 mol %; and (C) an organic reducing agent containing oxygen and selected from a group consisting of methanol, ethanol, butyl alcohol, propyl alcohol, dimethyl carbonate or combinations thereof; where the said organic reducing agent and NO_x are present in molar ratio carbon: NO_x ranging from approximately 0.5:1 to 24:1. Also described are methods of reducing NO_x which involve the following steps: providing a gas mixture and bringing the said gas mixture into contact with above described catalysts for reducing NO_x (versions).

EFFECT: reduced ill effects of air contamination caused by by-products of incomplete high-temperature combustion of organic substances.

21 cl, 34 ex, 4 tbl