Title:
排ガス浄化用触媒
Document Type and Number:
Japanese Patent JP5232401
Kind Code:
B2
Abstract:
A high NO x -purifying performance at high temperature conditions is achieved with a small amount of precious metal used. An exhaust gas-purifying catalyst (1) includes a substrate (2), a lower layer (3) formed on the substrate (2) and including a first composite oxide, palladium and platinum, and an upper layer (4) formed on the lower layer (3) and including a second composite oxide and rhodium. The first composite oxide includes cerium, zirconium, and an element selected from the group consisting of rare-earth elements other than cerium and alkaline-earth elements. A mass ratio of platinum with respect to palladium falls within a range of 1/50 to 1/20. The second composite oxide includes zirconium and an element selected from the group consisting of rare-earth elements other than cerium and alkaline-earth elements and has an atomic ratio of cerium with respect to zirconium smaller than that of the first composite oxide.
Inventors:
Asuka Hori
Akira Masai
Keiichi Narita
Akira Masai
Keiichi Narita
Application Number:
JP2007099548A
Publication Date:
July 10, 2013
Filing Date:
April 05, 2007
Export Citation:
Assignee:
Cataler Co., Ltd.
International Classes:
B01J23/58; B01D53/94; B01J37/02; F01N3/28
Domestic Patent References:
| JP2006263581A | ||||
| JP8024644A | ||||
| JP2006205050A | ||||
| JP2006035043A | ||||
| JP2007275878A |
Attorney, Agent or Firm:
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto