Process for rejuvenating automobile emission control catalysts

Details Process for rejuvenating automobile emission control catalysts Process for rejuvenating automobile emission control catalysts

1975-12-15

1977-08-02

Douglas, Winston A.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

4232135, B01J 2396, B01J 2394

Patent

active

040394719

ABSTRACT:
A method for the rejuvenation of an automobile emission control catalyst poisoned with deposited compounds of lead and/or phosphorus is disclosed, said method comprising (a) initially extracting some of the poison compounds from the catalyst with a select aqueous ammonium or acetate salt (preferably ammonium acetate) solution; (b) exposing the catalyst to a reducing atmosphere at 300.degree. to 700.degree. C., and finally (c) removing at least a portion of the poison compounds by a second extraction with a select aqueous ammonium or acetate salt solution. Catalysts contemplated for rejuvenation herein include those comprising nickel, palladium, rhodium, platinum, or combinations thereof as active components on bases of alumina or aluminum borate.

REFERENCES:
patent: 2867497 (1959-01-01), Houdry et al.
patent: 3025133 (1962-03-01), Robinson et al.
patent: 3072457 (1963-01-01), Bloch
patent: 3072458 (1963-01-01), Page
patent: 3983052 (1976-09-01), McArthur

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