The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 1977
Filed:
Dec. 15, 1975
Dennis P McArthur, Yorba Linda, CA (US);
Union Oil Company of California, Los Angeles, CA (US);
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.