Patent ID: 8580705

Claim:
An exhaust gas purifying catalyst comprising: a substrate that defines a gas passage through which an exhaust gas flows; a lower catalyst layer that is formed on a surface of the substrate; and an upper catalyst layer that is formed on a surface of the lower catalyst layer, wherein the lower catalyst layer includes a lower catalytic precious metal comprised of at least one of Pt and Pd, and a lower-layer carrier that supports the lower catalytic precious metal; wherein the upper catalyst layer includes an upper catalytic precious metal which contains Rh, and an upper-layer carrier that supports the upper catalytic precious metal, wherein the upper-layer carrier comprises an inorganic mixed oxide that contains Ce, Zr, Al, Nd, and at least one element selected from the group consisting of rare earth elements other than Ce; wherein the inorganic mixed oxide has interior regions containing a mixed aggregate composed of first particles comprising Ce and Zr in a form of a composite oxide, and second particles comprising Al in a form of alumina, and has cover layers containing Nd that cover surfaces of the respective interior regions, and wherein the Nd is unevenly distributed in the cover layers.