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. 25, 2006
Filed:
Sep. 03, 2001
Tetsuya Yamashita, Gotenba, JP;
Shinichi Takeshima, Susono, JP;
Toshiaki Tanaka, Numazu, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An exhaust gas purifying catalyst capable of exerting excellent NOpurifying capability even at high exhaust gas temperatures, exceeding 500° C., is provided. The catalyst is an absorption reduction-type NOpurifying catalyst comprising an NOabsorbent obtained by loading at least one alkali metal or alkaline earth metal on a crystalline ZrOcomposite oxide having added thereto at least one trivalent rare earth metal or divalent alkaline earth metal. Preferably, aluminum is further supported on the ZrOcomposite oxide. The NOabsorbent is considered to have an NOabsorption mechanism that an electron released from the alkali metal or the like enters into an oxygen vacancy part of the crystalline ZrOand this oxygen vacancy part functions as a strong base site for donating an electron to an electrophilic component such as NO.