05057483 is referenced by 122 patents and cites 3 patents.

A catalyst composition suitable for three-way conversion of internal combustion engine, e.g., automobile gasoline engine, exhaust gases includes a catalytic material disposed in two discrete coats on a carrier. The first coat includes a stabilized alumina support on which a first platinum catalytic component is dispersed and bulk ceria, and may also include bulk iron oxide, a metal oxide (such as bulk nickel oxide) which is effective for the suppression of hydrogen sulfide emissions, and one or both of baria and zirconia dispersed throughout the first coat as a thermal stabilizer. The second coat, which may comprise a top coat overlying the first coat, contains a co-formed (e.g., co-precipitated) rare earth oxide-zirconia support on which a first rhodium catalytic component is dispersed, and a second activated alumina support having a second platinum catalytic component dispersed thereon. The second coat may also include a second rhodium catalytic component, and optionally, a third platinum catalytic component, dispersed as an activated alumina support. The present invention also provides a method for treating engine exhaust gases by contacting the gases under conversion conditions with the catalyst composition.

Title
Catalyst composition containing segregated platinum and rhodium components
Application Number
7/483485
Publication Number
5057483
Application Date
February 22, 1990
Publication Date
October 15, 1991
Inventor
Chung Zong Wan
Somerset
NJ, US
Assignee
Engelhard Corporation
NJ, US
IPC
B01J 23/46
B01J 23/42
B01J 23/10
B01J 21/04
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