Catalyst for purifying exhaust gas and method of purifying exhau

Details Catalyst for purifying exhaust gas and method of purifying exhau Catalyst for purifying exhaust gas and method of purifying exhau

1994-03-28

1996-01-30

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60286, 60301, 4232132, 4232135, F01N 320

Patent

active

054872685

ABSTRACT:
A catalyst comprising an iridium supported on at least one carrier selected from the group consisting of metal carbides and metal nitrides for eliminating nitrogen oxides in exhaust gas in the presence of oxygen in excess of the stoichiometric quantity of oxidizing components for reducing components. The catalyst is effective for eliminating NO.sub.x in exhaust gas from lean burn engines such as lean burn gasoline engines and diesel engines containing excess O.sub.2 corresponding to an A/F ratio of 17 or over.

REFERENCES:
patent: 3953363 (1976-04-01), Yamauchi et al.
patent: 4039622 (1977-08-01), Murrell et al.
patent: 4372933 (1983-02-01), Kyung et al.
patent: 4492770 (1985-01-01), Blanchard et al.
patent: 5155994 (1992-10-01), Muraki
patent: 5201802 (1993-04-01), Hirota

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