CATALYST MATERIAL AND CATALYST FOR PURIFICATION OF EXHAUST GAS

Title:

CATALYST MATERIAL AND CATALYST FOR PURIFICATION OF EXHAUST GAS

Document Type and Number:

Japanese Patent JP3812580

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To improve the heat resistance of a composite oxide so as to maintain high exhaust gas purifying performance over a long period even with a small amount of catalyst noble metals.
SOLUTION: A catalyst for purification of exhaust gas has a catalyst layer 6 which contains the composite oxide containing Ce, Zr, Nd and a catalyst noble metal(s) and activated alumina, on the surface of the cell wall 5 of a honeycomb support. The ratio of ZrO2/(CeO2+ZrO2) of the composite oxide is 65-90 mass%, and the ratio of Nd2O3/(CeO2+ZrO2+Nd2O3) of 2.6-40 mass%.

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Inventors:

Akamine Shinmei
Shuji Iwakuni
Seiji Miyoshi
Keiji Yamada
Akihide Takami

Application Number:

JP2004351154A

Publication Date:

August 23, 2006

Filing Date:

December 03, 2004

Export Citation:

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Assignee:

Mazda Corporation Inc

International Classes:

B01J23/63; B01D53/94; B01J23/56; F01N3/28

Domestic Patent References:

JP2004174490A

Attorney, Agent or Firm:

Hiroshi Maeda
Hiroshi Koyama
Hiroshi Takeuchi
Takahisa Shimada
Yuji Takeuchi
Katsumi Imae
Atsushi Fujita
Kazunari Ninomiya
Tomoo Harada
Iseki Katsumori

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