Exhaust gas purification catalyst device
AssigneeCataler Corporation
InventorsTatsuya OHASHI, Kohei TAKASAKI
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Abstract
An exhaust gas purification catalyst device having a substrate, a first catalyst coating layer on the substrate, and a second catalyst coating layer on the first catalyst coating layer. The first catalyst coating layer includes inorganic oxide particles, palladium carried on the inorganic oxide particles, and a barium compound. The second catalyst coating layer includes alumina particles and rhodium carried by the alumina particles. The ratio (MBa/MRh) between the mass (MBa) of barium in the first catalyst coating layer and the mass (MRh) of rhodium in the second catalyst coating layer is 5.0-60.0 inclusive.
Claims13
An exhaust gas purification catalytic device, comprising
- a substrate, a first catalytic coating layer on the substrate, and a second catalytic coating layer on the first catalytic coating layer, wherein:
- the first catalytic coating layer comprises inorganic oxide particles, palladium supported on the inorganic oxide particles, and a barium compound,
- the second catalytic coating layer comprises alumina particles and rhodium supported on the alumina particles, and
- the ratio (MBa/MRh) of the mass (MBa) of barium in the first catalytic coating layer to the mass (MRh) of rhodium in the second catalytic coating layer is 5.0 or greater and 60.0 or less.
Dependencies are inferred from the claim text.