CATALYST-TRAP NO IN CONDITIONS OF LEAN MIXTURE WITH IMPROVED CHARACTERISTICS AT HIGH AND LOW TEMPERATURES Russian patent published in 2019 - IPC B01D53/56 B01D53/94 B01J23/02 B01J23/40 B01J37/02 

FIELD: chemistry.

SUBSTANCE: invention relates to nitrogen oxides accumulation materials, which can be part of catalytic trap used for treatment of exhaust gas streams, as well as systems and methods of their application. Trap-catcher composition NO_x in conditions of a lean mixture, a washcoat type coating layer on a carrier substrate comprising a first substrate material containing more than 50 wt. % of recovered metal oxide, from 10 to 30 wt. % of alkali-earth metal oxide deposited on second substrate material containing heat-resistant metal oxide, and 50 wt. % or less of the reduced metal oxide, and a platinum group metal component supported on at least one of the first substrate material and the second substrate material.

EFFECT: invention provides improved accumulation and regeneration of NO_x at low and high temperatures, as well as improved aging stable accumulation of NO_x.

53 cl, 1 dwg, 6 tbl, 9 ex