Platinum, rhodium, and palladium catalyst for automotive emissio

Details Platinum, rhodium, and palladium catalyst for automotive emissio Platinum, rhodium, and palladium catalyst for automotive emissio

1978-02-06

1979-05-08

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252466PT, 4232155, B01J 2104, B01J 2310, B01J 2342, B01J 2344

Patent

active

041535790

ABSTRACT:
A three-way layered catalyst for use in a stoichiometric air/fuel ratio system comprising an alumina support having deposited thereon the catalyst materials platinum, palladium and rhodium and having a first layer of platinum positioned at the support surface, a second layer of catalyst material selected from the group consisting of rhodium and a mixture of palladium and rhodium adjacent to and radially inward of the first layer with palladium inward of and adjacent to said second layer where the catalyst material of such layer is rhodium. Cerium oxide may be added to the support for improved performance.

REFERENCES:
patent: 3257163 (1966-06-01), Stiles
patent: 3741725 (1973-06-01), Graham
patent: 4051072 (1977-09-01), Bedford et al.
patent: 4051073 (1977-09-01), Hegedus et al.

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