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:
Jun. 14, 2005
Filed:
Aug. 01, 2001
Shinichi Takeshima, Susono, JP;
Tetsuya Yamashita, Gotenba, JP;
Toshiaki Tanaka, Numazu, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A catalyst able to overcome defects of an absorption reduction-type NOpurifying catalyst, such as poor NOpurifying capability at low temperatures and low SOdesorbing property, is provided. The catalyst is an absorption reduction-type NOpurifying catalyst where NOabsorbent particles and support particles having supported thereon a catalyst component are mixed. Preferably, acidic support particles are added to the support particle, the NOabsorbent particles are a metal oxide having a base point, and the metal oxide is rare earth-added zirconia. In conventional catalysts, the NOabsorbent such as alkali metal having strong basicity exposes the catalyst component present together on the same support to the basic condition to decrease the catalytic performance. However, in the present invention, the NOabsorbent and the support are separate particles, whereby the catalyst component can exert its original catalytic performance and, as a result, the NOpurifying capability at low temperatures and the SOdesorbing property are improved.