Catalyst for cleaning exhaust gas

Details Catalyst for cleaning exhaust gas Catalyst for cleaning exhaust gas

1997-03-27

2000-07-18

Griffin, Walter D.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502302, 502326, 502327, 502332, 502333, 502334, 502339, B01J 2310, B01J 2340

Patent

active

060907444

ABSTRACT:
In the exhaust gas purifying catalyst (3), palladium is contained as a catalytic component and cerium oxide and (Ce, Pr) compound oxide is contained as a promoter. Now, the weight ratio of cerium oxide to (Ce, Pr) compound oxide is set between 9/1 and 7/3, and the ratio of praseodymium to cerium in the (Ce, Pr) compound oxide is set between 3 mol % and 50 mol %. In this way, because in this exhaust gas purifying catalyst (3), palladium with high low-temperature activity is used for a catalytic component, the exhaust gas purifying performance at low temperature is improved. And because cerium oxide and (Ce, Pr) compound oxide improves catalytic activity of palladium at high temperature, the exhaust gas purifying performance at high temperature, in particular, NOx purifying performance, is improved.

REFERENCES:
patent: 4839146 (1989-06-01), Cho et al.
patent: 5248650 (1993-09-01), Sekiba et al.
patent: 5254519 (1993-10-01), Wan et al.
patent: 5556825 (1996-09-01), Shelef et al.
patent: 5597771 (1997-01-01), Hu et al.
patent: 5884473 (1999-03-01), Noda et al.

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