ZONED CATALYTIC FILTERS FOR CLEANING EXHAUST GAS Russian patent published in 2017 - IPC B01D53/94 B01J29/72 B01D29/72 F01N3/00 

FIELD: gas industry.

SUBSTANCE: invention relates to articles and methods which can be used for treating exhaust gases, formed in process of hydrocarbon combustion. Catalytic article has a wall flowing monolith, having an inlet side, an outlet side and axis of gas flow from inlet to outlet side, a first SCR catalyst composition, containing material of a molecular sieve with first concentration of molecular sieve and exchanged metal with first concentration of metal, wherein first SCR catalyst is located in a first zone, and a second SCR catalyst composition, containing material of molecular sieve with concentration which is at least 20 % less than first concentration of molecular sieve, and exchanged metal with first concentration of metal, wherein second SCR catalyst is located in a second zone, wherein first and second zones are located within part of wall flowing monolith and along axis of gas stream and first zone is located closer to inlet side, and second zone is located closer to outlet side.

EFFECT: invention provides high catalytic efficiency of filter component, as well as reduced counter pressure and penetration of ammonia.

20 cl, 8 dwg, 2 ex