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:
Feb. 17, 1998
Filed:
Aug. 05, 1996
Thierry Chopin, Saint Denis, FR;
Jean-Luc Le Loarer, Salindres, FR;
Rhone-Poulenc Chimie, Courbevoie Cedex, FR;
Abstract
Heat-stable alumina particulates well suited as catalysts/catalyst supports, notably for the catalytic conversion of vehicular exhaust gases, contain a stabilizing amount of lanthanum values, optionally a costabilizing amount of neodymium values, and have a specific surface area of greater than 40 m.sup.2 /g after calcination at 1,200.degree. C. for 4 hours; these are produced by ripening/rehydrating an alumina powder at least partially into boehmite/pseudo-boehmite state in the presence of a stabilizing amount of at least one lanthanum compound, e.g, lanthanum nitrate, and, optionally, also at least one neodymium compound, the starting alumina powder being the product of rapid dehydration of at least one aluminum hydroxide and/or aluminum oxyhydroxide.