Exhaust gas purifying catalyst and process for producing the sam

Details Exhaust gas purifying catalyst and process for producing the sam Exhaust gas purifying catalyst and process for producing the sam

1988-03-04

1989-06-27

Garvin, Patrick P.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502303, 502304, B01J 2300

Patent

active

048430560

ABSTRACT:
An exhaust gas purifying catalyst for oxidizing HC and CO and for reducing NOx is provided, which comprises at least one oxide of rare earth element, rhodium, and at least one of platinum and palladium loaded on alumina grains. The major amount of rhodium is dispersed on the oxide of rare earth element. Thus, the rhodium solidification into the alumina grains is prevented. Further, when cerium oxide accompanying lanthanum oxide, neodymium oxide or a mixture thereof is used as the oxide of rare earth element, the sintering of cerium oxide or palladium at a high temperature is suppressed since it forms a complex oxide with lanthanum oxide, neodymium oxide or a mixture thereof. Additionally, when stabilized alumina grains in which a rare earth element and an alkali earth element are present in a solid solution state are used, the deterioration of NOx purifying activity of the catalyst at a high temperature is suppressed. The exhaust gas purifying catalyst of this invention has high durability as well as high activity at a high temperature.

REFERENCES:
patent: 3892836 (1975-07-01), Compton et al.
patent: 4157316 (1979-06-01), Thompson et al.
patent: 4170573 (1979-10-01), Ernest et al.
patent: 4316822 (1982-02-01), Fujitani et al.
patent: 4581343 (1986-04-01), Blanchard et al.
patent: 4585752 (1986-04-01), Ernest
patent: 4639432 (1987-01-01), Holt et al.
patent: 4711870 (1987-12-01), Yamada et al.

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