Catalyst for purifying exhaust gas

Details Catalyst for purifying exhaust gas Catalyst for purifying exhaust gas

2007-06-05

2010-10-19

Langel, Wayne (Department: 1793)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C423S213500, C423S244100, C502S304000, C502S326000, C502S339000, C502S344000, C502S527120

Reexamination Certificate

active

07816300

ABSTRACT:
The present invention provides an exhaust gas purification catalyst comprising a base material, and a two or more layered catalyst coating layer, formed on the base material, wherein the two or more layers have upper and lower layers, and wherein the upper layer contains a large amount of noble metal per liter of the base material more than that of the lower layer, and the lower layer contains a large amount of an oxygen storage/release material per liter of the base material more than that of the upper layer. This exhaust gas purification catalyst has more excellent H2S purifying performance than conventional catalysts while maintaining purifying performance against NOx and the other exhaust gas components.

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Supplementary European Search Report in European Application No. 07 74 4976 mailed Apr. 30, 2010.

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