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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.:

US 7939462 B1

PDFFull Text
Date of Patent:
May. 10, 2011

Filed:

Mar. 17, 2004

Composition based on cerium and zirconium oxides having a specific surface which is stable between 900° c and 1000° c method for the production and use thereof as a catalyst

Applicants:

Olivier Larcher, Perigny, FR;

Emmanuel Rohart, Sainte Soulle, FR;

David Monin, Paris, FR;

Inventors:

Olivier Larcher, Perigny, FR;

Emmanuel Rohart, Sainte Soulle, FR;

David Monin, Paris, FR;

Assignee:

Rhodia Operations, Aubervilliers, FR;

Attorney:

Buchanan Ingersoll & Rooney, P.C.

Primary Examiner:

Patrick Ryan

Assistant Examiner:

Heng M Chan

Int. Cl.
CPC ...
B01J 23/10 (2006.01);
U.S. Cl.
CPC ...
Abstract

The inventive composition, according to a first embodiment, consists essentially of a cerium oxide and a zirconium oxide. According to a second embodiment, said composition is based on cerium oxide, zirconium oxide and at least one rare earth oxide other than cerium. After a first 4-hour period of calcination at 900 .C followed by a second 10-hour period of at 1000 .C, the specific surface variation thereof is 20% maximum in the first embodiment and 15% maximum in the second embodiment. The inventive composition can be used as a catalyst, i.e. in the treatment of waste gases from internal combustion engines.

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