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:
Dec. 15, 2009
Filed:
Apr. 29, 2004
Yasuhide Takao, Shiizu, JP;
Colin Norman, Swinton, GB;
Gavin Edwards, Swinton, GB;
Ian Chisem, Swinton, GB;
Clare Jones, Swinton, GB;
Yasuhide Takao, Shiizu, JP;
Colin Norman, Swinton, GB;
Gavin Edwards, Swinton, GB;
Ian Chisem, Swinton, GB;
Clare Jones, Swinton, GB;
Magnesium Elektron, Ltd., Manchester, GB;
Abstract
This invention relates to a process for preparing zirconium oxide, in its various forms, including zirconium-based mixed oxides. There is described a process for preparing a zirconium oxide in the absence of a cerium salt which comprises precipitating a zirconium hydroxide from an aqueous solution of a zirconium salt by reaction with an alkali in the presence of a controlled amount of sulphate anions at a temperature not greater than 50° C. and then calcining the hydroxide to form an oxide, wherein the oxide thus formed is essentially sulphate free. Catalysts and ceramics can be produced from the product oxides having improved thermal stability and improved sinterability, respectively. A particular use of the product oxide is as a promoter or catalyst support in automobile exhaust systems.