Exhaust gas purification catalyst
AssigneeCataler Corporation
InventorHiroki Nihashi
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Abstract
An exhaust gas purification catalyst including particles of a catalyst metal supported on secondary particles of an inorganic oxide, wherein when scanning transmission electron microscope-energy dispersive X-ray line analysis is performed from a surface of the secondary particles toward a center thereof, a support density of the catalyst metal on a surface side of the secondary particles is greater than the support density of the catalyst metal in a center part of the secondary particles.
Claims18
An exhaust gas purification catalyst comprising particles of a catalyst metal supported on secondary particles of an inorganic oxide, wherein when scanning transmission electron microscope-energy dispersive X-ray line analysis is performed from a surface of the secondary particles toward a center thereof, a support density of the catalyst metal on a surface side of the secondary particles is greater than the support density of the catalyst metal in a center part of the secondary particles, wherein
- an average particle diameter of the secondary particles is more than 1.5 μm, and
- 80% or more of the catalyst metal is supported within a range of 600 nm from the surface of the secondary particles.
An exhaust gas purification catalyst comprising particles of a catalyst metal supported on secondary particles of an inorganic oxide, wherein
- when scanning transmission electron microscope-energy dispersive X-ray line analysis is performed from a surface of the secondary particles toward a center thereof, a support density of the catalyst metal on a surface side of the secondary particles is greater than the support density of the catalyst metal in a center part of the secondary particles, wherein
- an average particle diameter of the secondary particles is more than 1.0 μm, and
- 80% or more of the catalyst metal is supported within a range of 400 nm from the surface of the secondary particles.
Dependencies are inferred from the claim text.