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. 18, 2000
Filed:
Mar. 27, 1997
Yuki Koda, Hiroshima, JP;
Satoshi Ichikawa, Hiroshima, JP;
Hiroshi Yamada, Hatsukaichi, JP;
Kenichi Yamamoto, Higashihiroshima, JP;
Kenji Okamoto, Hiroshima, JP;
Toshitsugu Ueoka, Higashihiroshima, JP;
Hiroshi Murakami, Hiroshima, JP;
Takashi Takemoto, Higashihiroshima, JP;
Kazuo Misonoo, Hiroshima, JP;
Masahiko Shigetsu, Higashihiroshima, JP;
Taeko Shimizu, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima-Ken, JP;
Abstract
In the exhaust gas purifying catalyst (3), palladium is contained as a catalytic component and cerium oxide and (Ce, Pr) compound oxide is contained as a promoter. Now, the weight ratio of cerium oxide to (Ce, Pr) compound oxide is set between 9/1 and 7/3, and the ratio of praseodymium to cerium in the (Ce, Pr) compound oxide is set between 3 mol % and 50 mol %. In this way, because in this exhaust gas purifying catalyst (3), palladium with high low-temperature activity is used for a catalytic component, the exhaust gas purifying performance at low temperature is improved. And because cerium oxide and (Ce, Pr) compound oxide improves catalytic activity of palladium at high temperature, the exhaust gas purifying performance at high temperature, in particular, NOx purifying performance, is improved.