Three-way catalyst for lean exhaust systems

Details Three-way catalyst for lean exhaust systems Three-way catalyst for lean exhaust systems

1986-03-17

1987-07-07

Shine, W. J.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502302, 4232135, B01J 2310, B01J 2342, B01J 2344, B01J 2346

Patent

active

046787704

ABSTRACT:
Three-way catalysts containing rhodium, rare earth oxide and platinum and/or palladium of improved durability, when subjected to exhaust gases containing excess oxygen, are formed, when the rhodium is segregated from the rare earth oxide, thereby preventing undesirable interactions between the rhodium and are earth oxide. The efficiency of the catalyst is optimized when the rhodium has an initial average particle size ranging from about 35 to about 80 .ANG. in diameter.

REFERENCES:
patent: 3993572 (1976-11-01), Hindin et al.
patent: 4157316 (1979-06-01), Thompson et al.
patent: 4448895 (1984-05-01), Ono et al.
Summers et al., "Interaction of Cerium Oxide with Noble Metals", J. of Catalysis, 58, pp. 131-143 (1979).

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