Patent ID: 7485271
Filing Date: 2009-02-03
Classification: B01D,B01J,Y02T

Abstract:
1. An exhaust system for a lean-burn internal combustion engine comprising a catalyst structure, which catalyst structure comprises a substrate monolith comprising a lean NO x catalyst (LNC) composition associated with at least one partial oxidation catalyst (POC) and means for introducing a reductant into an exhaust gas upstream of the LNC composition, wherein the LNC composition is selected from the group consisting of: (a) silver or a silver compound supported on alumina; and (b) at least one metal selected from the group consisting of copper (Cu), iron (Fe), cobalt (Co) and cerium (Ce) supported on at least one zeolite, and wherein the at least one POC is a bulk oxide, a bulk composite oxide or a bulk mixed oxide comprising at least one metal selected from the group consisting of manganese (Mn), iron (Fe), cerium (Ce) and praseodymium (Pr).