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US 12,415,178 B2Granted
Ammonia oxidation catalyst device
AssigneeCataler Corporation
InventorYoshinori Yamashita
Life of this patent
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Abstract
An ammonia oxidation catalyst device, including a substrate, a first catalyst coat layer and a second catalyst coat layer, wherein: the first catalyst coat layer includes inorganic oxide particles and a catalytic noble metal supported on the inorganic oxide particles; the second catalyst coat layer includes an NOx selective reduction catalyst and a proton zeolite H-Zeolite; the first catalyst coat layer is present on the substrate; and the second catalyst coat layer is present on the first catalyst coat layer.
Claims11
An ammonia oxidation catalyst device, comprising:
- a substrate;
- a first catalyst coating layer that contains:
- inorganic oxide particles;
- and
- a catalyst precious metal carried on the inorganic oxide particles;
- and
- a second catalyst coating layer that contains:
- a NOx selective reduction catalyst comprising a tungsten-cerium-titanium-silicon composite oxide;
- and
- a proton zeolite, and
- wherein a positional relationship of the substrate, the first catalyst coating layer, and the second catalyst coating layer is either of A and B described below:
- A the first catalyst coating layer is present on the substrate, and
- the second catalyst coating layer is present on the first catalyst coating layer;
- and
- B the second catalyst coating layer is present on the substrate on an exhaust gas flow upstream side, and
- the first catalyst coating layer is present on the substrate on an exhaust gas flow downstream side.
13 more elements
Dependencies are inferred from the claim text.