Patent ID: 7759283

Claim:
A catalyst for purifying exhaust gas, comprising: a honeycomb-shaped structure having a plurality of cellular passages demarcated by a plurality of cellular partition walls; and a catalytic coating layer defined on a surface of the cellular partition walls; wherein the catalytic coating layer comprises a lower layer containing an oxygen storage capacity material and an upper layer defined on a surface of the lower layer and containing a catalytic noble metal; at least 90% of the catalytic coating layer exhibits a total thickness in a range of 10 μm-80 μm; a thickness of the upper layer is 5 μm-40 μm; a first catalytic noble metal being at least one member selected from the group consisting of Pt, Pd and Rh is loaded onto the upper layer; and a second catalytic noble metal is loaded onto the lower layer, the second catalytic noble metal being a catalytic noble metal different from the first catalytic noble metal.