Patent ID: 8211824

Claim:
An exhaust gas purification catalyst comprising: a plurality of catalyst layers stacked on a carrier, wherein at least one catalytic metal of Pd, Pt, or Rh is supported on at least one of oxide particles of activated alumina particles or Ce-containing oxide particles in a first catalyst layer of the plurality of catalyst layers, and first binder particles which are fine, and made of mixed oxide containing Zr and rare earth metal except for Ce, and have oxygen ion conductivity, and a particle size distribution represented by frequency in which a peak particle size value is in the range of 100 nm to 300 nm, both inclusive, are interposed among the oxide particles, and at least one catalytic metal of Pd, Pt, or Rh is supported on at least one of oxide particles of activated alumina particles or Ce-containing oxide particles in a second catalyst layer of the plurality of catalyst layers formed on or above the first catalyst layer, and second binder particles which are fine, are made of catalytic metal-doped mixed oxide containing Ce, and the catalytic metal, and are capable of storing and releasing oxygen depending on a change in an oxygen concentration in the exhaust gas are interposed among the oxide particles.