| abstract |
A catalysed substrate monolith (12) for use in treating exhaust gas emitted from a lean- burn internal combustion engine, which catalysed substrate monolith (12) comprising a first washcoat coating (16) and a second washcoat (coating18), 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 wherein the second washcoat coating is oriented to contact exhaust gas that has contacted the first washcoat coating. |