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. 10, 1993
Filed:
Jun. 05, 1992
Chaitanya K Narula, Ann Arbor, MI (US);
William L Watkins, Toledo, OH (US);
Mohinder S Chattha, Northville, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
A catalyst having high temperature (800.degree.-1050.degree. C.) stability and improved three-way automotive exhaust gas catalyst activity at high temperatures, comprising an outer catalytic coating of binary La-Pd oxide (La.sub.2 Pd.sub.2 O.sub.5 or La.sub.4 PdO.sub.7) calcined and supported on a catalyst-supporting substrate, the oxide being present in an amount to provide 15-150 g of Pd per cubic foot of the substrate A method of making binary La-Pd oxides useful as an automotive exhaust catalyst operative at high temperatures, comprising heating in an oxidizing atmosphere a mixture containing La compounds and Pd compounds in a La:Pd ratio of 1:1 or 4:1, the heating being staged to first heat slowly from about 50.degree. C. to start decomposition of the compounds and thereafter retaining the residue at an elevated temperature to stimulate growth of crystalline binary La-Pd oxides and to calcine the crystalline oxides. A method of making an automotive catalyst by suspending binary La-Pd oxides in a sol (preferably alumina sol) and depositing and fixing such sol suspension on a substrate coated with conventional washcoats.