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US 2011/0237429 A1Published application
Exhaust gas purification catalyst
AssigneeMazda Motor Corporation
InventorsMasaaki AKAMINE, Masahiko SHIGETSU
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Abstract
A catalytic metal 5 is supported on oxide particles 4, 6 in a first catalyst layer 2, and first binder particles 7 which are fine, and have oxygen ion conductivity are interposed among the oxide particles. A catalytic metal 11 is supported on oxide particles 8, 9, 12 in a second catalyst layer 3 provided on or above the first catalyst layer 2, and second binder particles 13 which are fine, and are capable of storing and releasing oxygen are interposed among the oxide particles.
Claims9
An exhaust gas purification catalyst comprising:
- a plurality of catalyst layers stacked on a support, 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 have oxygen ion conductivity 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, 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.
Dependencies are inferred from the claim text.