CPC B01J 29/076 (2013.01) [B01D 53/944 (2013.01); B01D 53/945 (2013.01); B01J 35/19 (2024.01); B01J 37/0244 (2013.01); B01J 37/0246 (2013.01); B01D 53/9418 (2013.01); B01D 53/9477 (2013.01); B01D 2255/1021 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/2073 (2013.01); B01D 2255/20738 (2013.01); B01D 2255/20746 (2013.01); B01D 2255/20753 (2013.01); B01D 2255/50 (2013.01); B01D 2255/502 (2013.01); B01D 2255/504 (2013.01); B01D 2255/9022 (2013.01); B01D 2255/91 (2013.01); B01D 2255/912 (2013.01); B01J 23/40 (2013.01); B01J 23/6562 (2013.01); Y02T 10/12 (2013.01)] | 17 Claims |
1. An oxidation catalyst composite for an abatement of exhaust gas emission 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 first washcoat layer comprising a first refractory metal oxide support, a platinum (Pt) component and a palladium (Pd) component in a ratio of Pt to Pd in a range of about 10:1 to 1:10; and
a second washcoat layer comprising a second refractory metal oxide support containing a manganese (Mn) component, a Pt component, and a Pd component, wherein the Mn component is dispersed on a surface of the second refractory metal oxide support as discrete manganese oxide particles;
wherein the Mn component content is in a range of 0.1% to 30% by weight, based on a weight of the second refractory metal oxide support;
wherein the Mn component is doped with Fe, Ni, Co, Cu, Ce, Sn, Ir, In, and combinations thereof;
wherein the second washcoat layer does not comprise a zeolite and
wherein the oxidation catalyst composite is effective to abate hydrocarbon and carbon monoxide, and to oxidize nitrogen monoxide (NO) to nitrogen dioxide (NO2) in a lean burn engine exhaust.
|