Three-way catalyst for lean operating engines

Details Three-way catalyst for lean operating engines Three-way catalyst for lean operating engines

B - Operations, Transporting

01

J

252/48

B01J 37/04 (2006.01) B01J 23/56 (2006.01) B01D 53/36 (1985.01)

Patent

CA 1242687

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 rare 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. P-type oxides in intimate contact with ceria are found to enhance the catalytic efficiency of platinum containing catalysts.

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