Patent ID: 8568674
Filing Date: 2013-10-29
Classification: B01D,B01J,F01N,Y02A

Abstract:
1. An oxidation catalyst composite for abatement of exhaust gas emissions from a lean burn engine comprising: a carrier substrate having a length, an inlet end and an outlet end, an oxidation catalyst catalytic material on the carrier, the oxidation catalyst catalytic material including a bottom washcoat layer and a top washcoat layer; the bottom washcoat layer comprising a refractory metal oxide support, a platinum (Pt) component and a palladium (Pd) component in weight ratio of Pt to Pd in the range of about 4:1 to 1:4; and the top washcoat layer comprising a zeolite, Pt and a refractory metal oxide support, the top washcoat layer being substantially free of palladium, the oxidation catalyst composite being effective to abate hydrocarbon and carbon monoxide, and oxidize NO to NO