Engine exhaust catalysts containing palladium-gold

Details Engine exhaust catalysts containing palladium-gold Engine exhaust catalysts containing palladium-gold

2009-05-05

2010-06-29

Wood, Elizabeth D (Department: 1793)

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

Zeolite or clay, including gallium analogs

C502S063000, C502S064000, C502S066000, C502S069000, C502S071000, C502S077000, C502S074000, C502S339000, C502S527130, C502S527190, C427S419300

Reexamination Certificate

active

07745367

ABSTRACT:
An emission control catalyst that exhibits improved CO and HC reduction performance includes a supported platinum-based catalyst, and a supported palladium-gold catalyst. The two catalysts are coated onto different layers, zones, or monoliths of the substrate for the emission control catalyst such that the platinum-based catalyst encounters the exhaust stream before the palladium-gold catalyst. Zeolite may be added to the emission control catalyst as a hydrocarbon absorbing component to boost the oxidation activity of the palladium-gold catalyst.

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