Patent ID: 8637426

Claim:
An oxidation catalyst composite for abatement of exhaust gas emissions from an engine comprising: a carrier substrate having a length, an inlet end and an outlet end, a diesel oxidation catalyst catalytic material on the carrier, the diesel oxidation catalyst catalytic material including a first washcoat zone and a second washcoat zone; the first washcoat zone comprising a first washcoat layer including one or more of platinum (Pt) and palladium (Pd) components and a first refractory metal oxide support, the first washcoat zone adjacent the inlet end of the carrier substrate; and the second washcoat zone comprising a second washcoat layer including a platinum component and a second refractory metal oxide support, the second washcoat layer adjacent the outlet end of the carrier substrate, wherein at least 50% of the platinum components are located in the second washcoat zone; and wherein the second washcoat layer is substantially free of palladium.