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:
Oct. 14, 2008
Filed:
Aug. 20, 2003
Shuichi Kanno, Hitachi, JP;
Shin Tamata, Oarai, JP;
Shinichi Ichikawa, Mito, JP;
Terufumi Kawasaki, Hitachinaka, JP;
Hisao Yamashita, Hitachi, JP;
Shuichi Kanno, Hitachi, JP;
Shin Tamata, Oarai, JP;
Shinichi Ichikawa, Mito, JP;
Terufumi Kawasaki, Hitachinaka, JP;
Hisao Yamashita, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An object of the present invention is to improve the decomposition at low temperatures of perfluorocompounds containing only fluorine as a halogen, such as CF, CFand the like. In the present invention, a perfluorocompound containing only fluorine as a halogen is brought into contact with a catalyst comprising Al, Ni and W as catalytically active ingredients and comprising a mixed oxide or complex oxide of Ni and Al and a mixed oxide or complex oxide of W and Ni, in the presence of steam or a combination of steam and air at a temperature of 500 to 800° C. to convert the fluorine in the perfluorocompound to hydrogen fluoride. Employment of the catalyst of the present invention improves the decomposition at low temperatures and hence makes it possible to decompose the perfluoro-compound at a high percentage of decomposition at a lower temperature.