Patent ID: 9005559
Filing Date: 2015-04-14
Classification: B01D,B01J,F01N,Y02A,Y10S

Abstract:
1. A catalysed substrate monolith for treating exhaust gas emitted from a lean-burn internal combustion engine comprising an oxidising catalyst on a substrate monolith, wherein the catalysed substrate monolith comprises a first washcoat coating having a length L and a second washcoat coating, wherein the second washcoat coating is disposed in a layer above the first washcoat coating for at least some of length L, wherein the first washcoat coating comprises a catalyst composition comprising platinum (Pt) and at least one support material for the platinum, wherein the second washcoat coating comprises a catalyst composition comprising both platinum (Pt) and palladium (Pd) and at least one support material for the platinum and the palladium and wherein a weight ratio of platinum (Pt) to palladium (Pd) in the second washcoat coating is ≦2.