06074973 is referenced by 46 patents and cites 80 patents.

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.

Title
Catalyzed hydrocarbon trap material and method of making the same
Application Number
9/45582
Publication Number
6074973
Application Date
March 20, 1998
Publication Date
June 13, 2000
Inventor
Robert J Farrauto
Westfield
NJ, US
Michel Deeba
North Brunswick
NJ, US
Jordan K Lampert
Metuchen
NJ, US
Agent
Richard A Negin
Assignee
Engelhard Corporation
NJ, US
IPC
F01N 3/28
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