Exhaust gas purifying catalyst
AssigneeCataler Corporation
InventorsShu Miyasaka, Eriko Tanaka, Norihiko Aono, Mai Huong Tran, Keigo Hori, Daisuke Sugioka
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Abstract
This exhaust gas purifying catalyst is provided with a substrate and a catalyst layer formed on a surface of the substrate. The catalyst layer contains zeolite particles that support a metal, and a rare earth element-containing compound that contains a rare earth element. The rare earth element-containing compound is added in such an amount that the molar ratio of the rare earth element relative to Si contained in the zeolite is 0.001 to 0.014 in terms of oxides.
Claims11
An exhaust gas purifying apparatus which is disposed in an exhaust pathway of an internal combustion engine and cleans exhaust gas emitted from the internal combustion engine, the apparatus comprising:
- an exhaust gas purifying catalyst comprising a substrate and a catalyst layer formed on a surface of the substrate, and
- a reducing agent supply mechanism which supplies a reducing agent for generation of ammonia to the exhaust gas at a position upstream in the exhaust pathway as compared to a position of the exhaust gas purifying catalyst, wherein
- the catalyst layer contains zeolite particles that support a metal and that support a rare earth element-containing compound that contains lanthanum (La) as a rare earth element, and
- an amount of the rare earth element-containing compound contained is such an amount that a molar ratio of the rare earth element relative to Si contained in the zeolite particles is 0.001 to 0.014 in terms of oxides, wherein
- the rare earth element-containing compound is disposed on a surface of the zeolite particles.
Dependencies are inferred from the claim text.