Process for rejuvenating automobile emission control catalysts

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

1975-04-07

1976-09-28

Garvin, Patrick P.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

B01D 1506

Patent

active

039830527

ABSTRACT:
A method for the rejuvenation of an automobile emission control catalyst poisoned with compounds of lead and/or phosphorus comprising (a) initially extracting lead sulfate deposits from the catalyst with an aqueous ammonium salt (preferrably ammonium acetate) solution; (b) exposing the catalyst to an atmosphere containing SO.sub.2, or SO.sub.2 and air, at 300.degree. to 700.degree.C. until other lead compounds are substantially converted to lead sulfate, and phosphorus compounds are substantially converted to gaseous P.sub.2 O.sub.5 ; and finally (c) removing at least a portion of the lead sulfate formed in (b) by a second extraction with an aqueous ammonium salt solution.
Catalysts contemplated for rejuvenation by the process of the invention 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: 3108972 (1963-10-01), Retailliau
patent: 3112277 (1963-11-01), Michalko
patent: 3168481 (1965-02-01), Erickson

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