Patent ID: 9046022
Filing Date: 2015-06-02
Classification: B01D,B01J,F01N,Y02A,Y02T

Abstract:
1. A catalysed substrate monolith for use in treating exhaust gas emitted from a lean-burn internal combustion engine, which catalysed substrate monolith comprising a first washcoat coating and a second washcoat coating, wherein the first washcoat coating comprises a catalyst composition comprising at least one platinum group metal (PGM) and at least one support material for the at least one PGM, wherein at least one PGM in the first washcoat coating is liable to volatilise when the first washcoat coating is exposed to relatively extreme conditions including relatively high temperatures, wherein the second washcoat coating comprises at least one metal oxide for trapping volatilised PGM and a catalyst composition comprising at least one metal selected from the group consisting of palladium, silver, gold and combinations of any two or more thereof, wherein the at least one metal oxide supports the at least one metal, wherein the second washcoat coating is oriented to contact exhaust gas that has contacted the first washcoat coating, and wherein the substrate monolith is a filtering substrate monolith having inlet surfaces and outlet surfaces, wherein the inlet surfaces are separated from the outlet surfaces by a porous structure.