Patent ID: 7879755

Claim:
A catalyst composite comprising: a catalytic material on a carrier, the catalytic material comprising a palladium component and two ceria-zirconia composite supports, the total ceria of both composite supports being present in an amount in the range of 10 to 70% by weight of the catalytic material, wherein substantially all of the ceria is in intimate contact with at least a portion of the palladium component and the catalytic material is effective to substantially simultaneously oxidize carbon monoxide and hydrocarbons and reduce nitrogen oxides; and wherein the catalytic material is substantially free of other precious metal components; wherein the catalytic material comprises two layers, the catalytic material comprising: an inner layer deposited on the carrier comprising the palladium component in an amount in the range of 30 to 70% by weight of palladium in the catalytic material, a first high surface area refractory metal oxide support, a first ceria-zirconia composite, and one or more of a promoter, stabilizer, or binder; and an outer layer deposited on the inner layer comprising the palladium component in an amount in the range of 30 to 70% by weight of palladium in the catalytic material, a second high surface area refractory metal oxide support, a second ceria-zirconia composite, and one or more of a promoter, stabilizer, or binder.