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:
Apr. 17, 2012
Filed:
Mar. 19, 2007
Stephan Verdier, Lyons, FR;
Olivier Larcher, Perigny, FR;
Emmanuel Rohart, Sainte Soulle, FR;
Bernard Pacaud, Hyogo, JP;
Hirofumi Takemori, Tokushima, JP;
Eisaku Suda, Tokushima, JP;
Stephan Verdier, Lyons, FR;
Olivier Larcher, Perigny, FR;
Emmanuel Rohart, Sainte Soulle, FR;
Bernard Pacaud, Hyogo, JP;
Hirofumi Takemori, Tokushima, JP;
Eisaku Suda, Tokushima, JP;
Rhodia Operations, Aubervilliers Cedex, FR;
Abstract
Catalyst compositions for the treatment of vehicular exhaust gases are based on zirconium and cerium oxides, have a cerium oxide content of at most 50% by weight, a level of reducibility of at least 95% after calcination in air at 600°, and a specific surface area after calcination for 4 hours at 1100° of at least 15 m/g; such compositions are prepared by forming an aqueous mixture containing zirconium and cerium compounds, by heating this mixture to at least 100° and, after the heating, adjusting it to a basic pH, by adding a surfactant additive to the precipitate obtained from this mixture and by calcinating the precipitate in an inert gas or under vacuum at a temperature of at least 900° and then in an oxidizing atmosphere at a temperature of at least 600°.