EXHAUST SYSTEM WITH MODIFIED NO TRAP IN THE NO DEPLETED EXHAUSTS Russian patent published in 2018 - IPC F01N3/35 F01N3/20 

FIELD: motor vehicle industry.

SUBSTANCE: invention relates to the purification of internal combustion engine exhaust gases. Described is exhaust system for the exhaust gas from internal combustion engine purification. Said system comprises modified NO_x (LNT) trap in the depleted of NO_x exhausts, urea injection system and the selective catalytic reduction catalyst by means of ammonia (NH₃-SCR). Said modified LNT comprises platinum, palladium, barium and containing the cerium dioxide material, and has the platinum to palladium molar ratio of at least 3:1. Said modified LNT accumulates NO_x at temperatures below about 200°C and releases the accumulated NO_x at temperatures above about 200°C. Said urea injection system injects urea at temperatures of above about 180°C.

EFFECT: with the use of invention, a system is created, which is capable of NO_x emissions reduction during the cold start-up, at that maintaining the CO oxidation high activity and demonstrating the resistance to deactivation due to sulfation.

14 cl, 1 tbl