CATALYST PREVENTING BREAKTHROUGH OF AMMONIA, DESIGNED AS THE FIRST IN SYSTEM OF SELECTIVE CATALYTIC REDUCTION (SCR) Russian patent published in 2020 - IPC B01D53/94 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalytic product preventing ammonia breakthrough to an exhaust system, a diesel engine mounted on a vehicle, a stationary plant or a water craft such as a ship containing said catalytic article, and to methods of providing an exothermic effect and reducing formation of N₂O from NH₃ in exhaust gases with a catalytic article. Product comprises base including inlet end and outlet end, first zone and second zone, in which: first zone comprises a catalyst which prevents ammonia slippage, comprising: (1) an ammonia oxidation catalyst containing a platinum group metal, and (2) a first selective catalytic reduction catalyst comprising a metal-substituted molecular sieve, vanadium or base metal; second zone comprises a second catalyst selected from a group consisting of a catalyst for oxidising diesel fuel, a diesel exothermic catalyst, a catalytic particulate filter, an NO_x absorber, a selective catalytic reduction catalyst/NO_x passive adsorber, a cold start catalyst or a three-way catalytic neutraliser. First zone is located upstream of the gas flow relative to the second zone, and the catalyst which prevents ammonia breakthrough is located at the inlet end inside the exhaust gas flow, and the second catalyst is located at the outlet end.

EFFECT: technical result consists in reduction of ammonia breakthrough.

43 cl, 24 dwg, 6 ex