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:
Jul. 24, 2007
Filed:
Aug. 22, 2002
Akira Morikawa, Aichi, JP;
Yasutaka Nagai, Aichi, JP;
Toshitaka Tanabe, Aichi, JP;
Tadashi Suzuki, Aichi, JP;
Akihiko Suda, Aichi, JP;
Hideo Sobukawa, Aichi, JP;
Akira Morikawa, Aichi, JP;
Yasutaka Nagai, Aichi, JP;
Toshitaka Tanabe, Aichi, JP;
Tadashi Suzuki, Aichi, JP;
Akihiko Suda, Aichi, JP;
Hideo Sobukawa, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Abstract
A composite oxide includes CeO, ZrOand a metallic oxide being free from reacting with CeOand ZrOat 700° C. or more, preferably at 900° C. or more and further preferably at 1,000° C. or more. The composite oxide has a regulatory oriented phase, such as a pyrochlore phase, etc., in which at least a part of Ce cations and Zr cations are oriented regularly. The composite oxide makes a catalytic support. The CeO—ZrOcomposite oxide and the reaction-free metallic oxide make barriers each other which suppress the granular growth when the composite oxide is subjected to high-temperature heat in a reducing heat treatment to form the regulatory oriented phase. The regulatory oriented phase improves the oxygen storage-and-release capability of the catalytic support. Thus, it is possible to simultaneously attain a large a specific surface area and a high oxygen storage-and-release capability.