Exhaust gas purification catalyst

摘要

An exhaust gas purification catalyst includes a substrate, and a first catalyst layer formed on the substrate, the first catalyst layer containing palladium and/or platinum and alumina doped with an alkaline-earth metal element. The exhaust gas purification catalyst has a correlation coefficientρAl,AE given by the following formula of 0.75 or more:ρAl , AE = C Al , AEσAl ⁢ σAE . ( 1 )