CATALYST CONTAINING BIMETALLIC NANOPARTICLES OF PLATINUM GROUP METALS Russian patent published in 2021 - IPC B01J35/04 B01J23/40 B01D53/94 F01N3/20 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalytically active product for reducing exhaust gas emissions from an internal combustion engine, a method for reducing one or several of the levels of CO, HC and NO_x in the stream of exhaust gas emissions from an internal combustion engine, a system for processing exhaust gas and a method for manufacturing a catalytically active product. The catalytically active product includes a catalyst substrate having a set of channels adapted for gas flow, wherein each channel has a wall surface, and catalytic coating on the surfaces or inside the pores of this wall, wherein this catalytic coating contains the first coating of a porous oxide of the “washcoat” type, containing a component of platinum group metal (PGM) and the first carrier of heat-resistant metal oxide, and the second coating of porous oxide of the “washcoat” type, containing a set of palladium-rhodium nanoparticles and the second carrier of heat-resistant metal oxide. Palladium-rhodium nanoparticles have an average primary particle size from 5 to 10 nm. Palladium-rhodium nanoparticles have a Pd : Rh mass ratio from 1:1 to 3:1. The first carrier made of heat-resistant metal oxide is a component of oxygen accumulation. The second carrier made of heat-resistant metal oxide is aluminum oxide. The first coating of porous oxide of the “washcoat” type is located directly on the catalyst substrate, and the second coating of porous oxide of the “washcoat” type is located on top of the first coating of porous oxide of the “washcoat” type.

EFFECT: providing three-way catalysts (TWC) that provide excellent catalytic activity, thermal stability and efficient use of Rh component and Pd component.

8 cl, 11 dwg, 5 tbl, 12 ex