EXHAUST-GAS PURIFYING CATALYST AND METHOD FOR PRODUCING SAME

Title:

EXHAUST-GAS PURIFYING CATALYST AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2015/083590

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide an exhaust-gas purifying catalyst containing a plurality of catalyst metals, with the catalyst layer thereof comprising a single layer, wherein the degree of dispersion of the catalyst metals is high and the catalyst performance thereof is also high. An additional purpose of the present invention is to provide a method for producing this catalyst, which can be definitively supported, without using an alkali solution. The present invention pertains to an exhaust-gas purifying catalyst obtained by forming a single catalyst layer on a support body, wherein: the catalyst layer is obtained by supporting palladium and rhodium on a carrier obtained by mixing an inorganic oxide such as alumina and a ceria-zirconia composite oxide with one another; and the ratio (SZr/SCe) of the zirconium concentration to the cerium concentration in the surface of the catalyst layer is 1.05-6.0 times the ratio (CZr/CCe) of the zirconium concentration to the cerium concentration at the interface between the catalyst layer and the support body.

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Inventors:

TATEMI AKIO (JP)
KAGAWA MASARU (JP)
ITAYA KAZUTO (JP)
TAKEDA KAZUTAKA (JP)

Application Number:

PCT/JP2014/081205

Publication Date:

June 11, 2015

Filing Date:

November 26, 2014

Export Citation:

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Assignee:

TANAKA PRECIOUS METAL IND (JP)

International Classes:

B01J23/63; B01D53/94; B01J37/02; F01N3/10

Domestic Patent References:

WO2009116468A1	2009-09-24
WO1990014888A1	1990-12-13

Foreign References:

JPS6458347A	1989-03-06
JPH11151439A	1999-06-08
JPH09131530A	1997-05-20
JP2006263583A	2006-10-05
JP2003526493A	2003-09-09

Attorney, Agent or Firm:

TANAKA AND OKAZAKI (JP)
Patent business corporation Tanaka and Okazaki and associates (JP)

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