Catalyst comprising iridium, alkaline metal, alkaline earth or r

Details Catalyst comprising iridium, alkaline metal, alkaline earth or r Catalyst comprising iridium, alkaline metal, alkaline earth or r

1996-05-17

1998-10-13

Caldarola, Glenn

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

Catalyst or precursor therefor

Inorganic carbon containing

502177, 502200, 502302, 502303, 502304, 502325, 502330, 502328, 502340, 502344, 4232135, 4232391, B01J 27224, B01J 2300, B01J 2358, B01J 2302

Patent

active

058211900

ABSTRACT:
The present invention provides a catalyst and method for purifying exhaust gases, having superior performance of NOx purification to exhaust gases containing oxygen and nitrogen oxides, particularly superior performance of NOx elimination to exhaust gases from lean-bum engines with excess oxygen, and a wider effective temperature range of NOx elimination, and also superior heat resistance at high temperature, said catalyst for purifying exhaust gases comprises, as indispensable contents, iridium and alkaline metal loaded on a carrier which is at least one selected from metal carbide and metal nitride, or these and at least one element selected from the group consisting of alkaline earth metal elements and rare earth metal elements, and said method using these catalyst.

REFERENCES:
patent: 4221768 (1980-09-01), Inoue et al.
patent: 4738946 (1988-04-01), Yamashita et al.
patent: 5326735 (1994-07-01), Itoh et al.
Greenwood et al. "Chemistry of the Elements" (No month, 1984) Pergamon Press Ltd., Oxford England, 1st ed., pp. 386 & 1292.
K. Taylor et al., J. of Catalysis, 63:53-71 (1980), "Selective Reduction of Nitric Oxide over Noble Metals".

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