Catalyst for purification of exhaust gases

Details Catalyst for purification of exhaust gases Catalyst for purification of exhaust gases

1990-04-27

1992-05-12

Konopka, Paul E.

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

Catalyst or precursor therefor

Phosphorus or compound containing same

4232135, 423239, 502208, 502210, 502214, B01J 27185, B01J 27182, B01J 27188, C01B 5334

Patent

active

051127903

ABSTRACT:
A catalyst used for purifying exhaust gases resulting from the combustion of a lean fuel-air mixture mixture comprises a porous support material having a framework formed by MO.sub.2, where M is silicon or a metal, AlO.sub.2 and PO.sub.2, and at least one base metal and at least one metal of the platinum group which are carried on ion exchange sites of the support material a coexistent state. The catalyst exhibits a high level of NO.sub.x conversion for a long time even at a high temperature owing to the high heat resistance and durability of the support material, and the cooperative action of the two kinds of metals, i.e. the promotion of the catalytic action of the base metal (e.g. copper) by the metal of the platinum group (e.g. palladium) serving as cocatalyst.

REFERENCES:
patent: 3449063 (1969-06-01), Griffing et al.
patent: 3540838 (1970-11-01), Reitmeier et al.
patent: 4297328 (1981-10-01), Ritscher et al.
patent: 4710485 (1987-12-01), Miller
patent: 4874590 (1989-10-01), Staniulis et al.

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