Patent ID: 8551908

Claim:
An exhaust gas purification catalyst comprising: a carrier base; a lower catalyst layer, formed on a surface of the carrier base, including: a lower layer carrier that contains a ceria-zirconia mixed oxide having 50 to 70 mass % of CeO 2 and 5 mass % or more of Pr 2 O 3 ; and at least one of Pt and Pd, which is carried by the lower layer carrier; and an upper catalyst layer, formed on a surface of the lower catalyst layer, including: an upper layer carrier that contains oxides including at least zirconia; and at least Rh that is carried by the upper catalyst layer, wherein the upper layer carrier contains a zirconia-cera mixed oxide containing 7 to 15 mass % of Y 2 O 3 , in which a ZrO 2 content is equal to or higher than 50 mass %, wherein a total amount of CeO 2 in the exhaust gas purification catalyst is 15 to 30 g per liter of the carrier base.