B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
23/341, 252/56
B01J 23/10 (2006.01) B01D 53/94 (2006.01) B01J 23/62 (2006.01) B01J 23/63 (2006.01) B01J 23/656 (2006.01) B01J 23/89 (2006.01) B01J 37/02 (2006.01)
Patent
CA 2034063
ABSTRACT OF TEE DISCLOSURE A catalyst composition suitable for three-way conver- sion of internal combustion engine, e.g., automobile gaso- line 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 plat- inum 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 in- clude a second rhodium catalytic component, and optionally, a third platinum catalytic component, dispersed as an acti- vated alumina support. The present invention also provides a method for treating engine exhaust gases by contacting the gases under conversion conditions with the catalyst compo- sition.
Sim & Mcburney
The Engelhard Corporation
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