CATALYTIC SYSTEM AND METHOD OF NO REDUCTION Russian patent published in 2009 - IPC B01J23/08 B01J23/62 B01J21/04 B01J23/18 B01J23/75 B01J23/24 B01D53/56 B01D53/94 

FIELD: chemistry.

SUBSTANCE: present invention refers to catalytic system and to the method of reduction of nitrogen oxides emissions using the said system. The described catalytic system for NO_x reduction contains: the catalyst containing the metal oxide substrate, catalytic metal oxide which is gallium oxide or silver oxide or both of them and initiating metal chosen from the group consisting of silver, cobalt, molybdenum, wolfram, indium, bismuth and their mixtures, gas flow containing the organic reducing agent and sulfur-containing substance. The described catalytic system for NO_x reduction contains: the catalyst consisting of (i) the metal oxide substrate, containing aluminium oxide, (ii) catalytic metal oxide which is gallium oxide or silver oxide or both of them in quantity 1-31 mole %; and (iii) initiating metal or their combination selected from the group consisting of silver, cobalt, molybdenum, wolfram, indium, bismuth, indium and wolfram, silver and cobalt, indium and molybdenum, indium and silver, bismuth and silver, bismuth and indium and molybdenum and indium in quantity 1-31 mole %, gas flow containing (A) water in quantity 1-15 mole %; (B) gaseous oxygen in quantity 1-15 mole %; and (C) organic reducing agent selected from the group consisting of alcanes, alkenes, alcohols, ethers, esters, carboxylic acids, aldehydes, ketones, carbonates and their combinations; and sulfur oxide; where at the specified organic reducing agent and NO_x are present in approximate molar ratio carbon to NO_x from 0.5:1 to 24:1. The described method of NO_x reducing includes the stages of gaseous mixture containing NO_x, organic reducing agent and sulfur-containing substance inflow and of said gaseous mixture contact with specified catalyst. The described method of NO_x reduction includes: inflow of gaseous mixture containing (A) NO_x, (B) water in quantity 1-15 mole %; (C) oxygen in approximate quantity 1-15 mole %; (D) organic reducing agent selected from the group consisting of alcanes, alkenes, alcohols, ethers, esters, carboxylic acids, aldehydes, ketones, carbonates and their combinations and (E) sulfur oxide; and contact of said gaseous mixture with catalyst described above and containing the specified components in the defined molar ratio.

EFFECT: improved action of the catalyst.

35 cl, 10 tbl, 84 ex