Manganese-containing diesel oxidation catalyst

An oxidation catalyst composite for an 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 comprising:
• a first washcoat including a zeolite, platinum (Pt), and a first refractory metal oxide support containing a manganese (Mn), wherein the Mn is present either in a form of surface dispersed Mn on the first refractory metal oxide or in a form of discrete manganese oxide particles on the first refractory metal oxide support, wherein the Mn content of the first washcoat is in a range of 0.1% to 20% by weight and wherein the manganese is doped with Fe, Ni, Co, Cu, Ce, Sn, Ir, In, or a combination thereof;
• a second washcoat including a second refractory metal oxide support, a platinum (Pt) component and a palladium (Pd) component in a ratio of Pt:Pd in a range of about 10:1 to 1:10;
• and
• a third washcoat comprising palladium and a rare earth oxide component, the third washcoat being substantially free of a platinum;
• wherein the oxidation catalyst composite is effective to abate hydrocarbon and carbon monoxide, and to oxidize nitrogen monoxide (NO) to nitrogen dioxide (NO2) in the lean burn engine exhaust.