ICE EXHAUST CLEANING SYSTEM Russian patent published in 2013 - IPC F01N3/08 F01N3/24 B01D53/94 

FIELD: engines and pumps.

SUBSTANCE: engine exhaust channel accommodates hydrocarbon feed valve 16, oxidation catalyst 13, exhaust gas cleaning catalyst 14 and NO_x selective reduction catalyst 15. "Air-to-fuel ratio" in exhaust gas flowing to catalyst 14 is reduced, a definite interval of maintaining lean content of said components being predefined, to make NO_x reduce in catalyst 14. While NO_x not reduced in said catalyst 14 is reduced by ammonia to be absorbed in NO_x selective reduction catalyst 15. Aforesaid "air-fuel" ratio, sometimes, is changed from lean to reach composition of said mix. Here ammonia formed in catalyst 14 is absorbed in catalyst 15.

EFFECT: high rate of NO_x removal even at high temperature of exhaust gas cleaning catalyst.

15 cl, 20 dwg