Diesel oxidation catalyst

An oxidation catalyst composite for abatement of exhaust gas emissions from a lean burn engine, the catalyst composite comprising:

• a carrier substrate having a length, an inlet end and an outlet end, an oxidation catalyst material on the carrier, the oxidation catalyst material comprising:
• a first oxidation material including a first refractory metal oxide support, a rare earth oxide component, and palladium (Pd), the first oxidation material being substantially free of platinum;
• a second oxidation material including a second refractory metal oxide support, and platinum (Pt) and palladium (Pd) in a platinum to palladium ratio of 10:1 to 1:10, the second oxidation material being substantially free of rare earth oxide;
• and
• a protective overlayer including a third refractory metal oxide, platinum (Pt) and, optionally, palladium (Pd), and a molecular sieve promoted with a metal selected from one or more of Cu, Fe, Co, Ni, Mn, V, and Ag, the protective overlayer being substantially free of a rare earth oxide.