Patent ID: 7998896

Claim:
An exhaust gas purifying catalyst comprising: a catalyst substrate; and a catalyst coating layer containing a noble metal and a refractory inorganic oxide, and formed on the catalyst substrate; wherein the catalyst coating layer includes an upstream portion located upstream and a downstream portion located downstream in a flow direction of the exhaust gas; the upstream portion has a layered structure including an upstream portion inside layer and an upstream portion outside layer; and the upstream portion inside layer contains a cerium-zirconium composite oxide in which a relative proportion of CeO 2 is 50 to 95 wt %, as the refractory inorganic oxide, and the upstream portion outside layer and the downstream portion contain a cerium-zirconium composite oxide in which a relative proportion of ZrO 2 is 50 to 95 wt %, as the refractory inorganic oxide.