AMMONIA SLIP CATALYST (ASC) WITH PLATINUM GROUP METAL IN SET OF LAYERS Russian patent published in 2022 - IPC B01D53/94 B01J23/42 B01J29/80 B01J29/76 B01J29/70 

FIELD: exhaust gas purification.

SUBSTANCE: invention relates to a catalytic product for purifying an exhaust gas stream containing solid particles, hydrocarbons, CO and ammonia, while the product contains substrate having an input end and an output end limiting the axial length of substrate; the first catalyst coating including: 1) platinum group metal distributed on a molecular sieve, and 2) base metal distributed on a molecular sieve; the second catalyst coating including: 1) platinum group metal distributed on a molecular sieve, and 2) base metal distributed on a molecular sieve, where the first catalyst coating is a lower layer, and the second catalyst coating is an upper layer, and where the specified first coating has a higher load of platinum group metal than the specified second coating. The invention also relates to an emission purification system and a method for reducing emissions of harmful substances.

EFFECT: reduction in emissions of harmful substances from the exhaust gas stream.

19 cl, 10 dwg, 1 ex