Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs
Patent
1998-03-20
2000-06-13
Dunn, Tom
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
502 64, 502 66, 502 67, 502 71, 502 74, 502 77, 502 79, 502330, 502339, 502347, 4232392, 4232132, 95902, B01J 2904
Patent
active
060749733
ABSTRACT:
A catalyzed hydrocarbon trap material washcoat (20) used in a trap (10), which may be placed downstream of a conventional catalyst member (28), is useful for treating internal combustion engine (22) exhaust. Trap (10) traps hydrocarbons during cold operation periods and releases them for oxidation during higher-temperature operating periods. The material comprises palladium and silver dispersed on a high surface area metal oxide support and a zeolite material such as one or more of ZSM-5, Beta, Y, and other suitable zeolites. The trap material is efficiently made by combining in a single vessel the zeolite, the metal oxide support, and aqueous solutions of a palladium compound and a silver compound. Surprisingly, the intimate combination of silver with the palladium does not adversely affect catalytic efficiency of the palladium and provides advantageous results in enhancing catalytic oxidation of hydrocarbons desorbed from the trap (10) and coke which forms thereon.
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Deeba Michel
Farrauto Robert J.
Lampert Jordan K.
Dunn Tom
Engelhard Corporation
Negin Richard A.
Nguyen Cam N.
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