Catalyst for the purification of exhaust gases of internal combu

Details Catalyst for the purification of exhaust gases of internal combu Catalyst for the purification of exhaust gases of internal combu

1980-02-11

1981-10-13

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

4232135, B01J 2106, B01J 2310, B01J 2389

Patent

active

042947260

ABSTRACT:
A three-way catalyst is described for the purification of automobile exhaust gases formed of an active substance of platinum and rhodium and possibly base metal(s) at a certain weight ratio between the two noble metals and at a certain atomic ratio between the noble and the base metal, which are precipitated onto active aluminum oxide containing certain quantities of CeO.sub.2, ZrO.sub.2 and Fe.sub.2 O.sub.3, and whereby the catalyst is obtained by impregnating active aluminum oxide, possibly stabilized with alkaline earth metal, with a solution of cerium, zirconium and iron salt which is thereupon calcined in air at 500.degree.-700.degree. C. and then treated after application of an impregnation of salts of the active substance components in a gas current containing hydrogen at temperatures below 650.degree. C.

REFERENCES:
patent: 4006103 (1977-02-01), Meguerian et al.
patent: 4048098 (1977-09-01), Koberstein et al.
patent: 4171288 (1979-10-01), Keith et al.

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