Title:
CATALYST FOR EXHAUST GAS PURIFICATION, METHOD FOR PRODUCING SAME, AND EXHAUST GAS PURIFICATION METHOD USING SAME
Document Type and Number:
WIPO Patent Application WO/2020/137200
Kind Code:
A1
Abstract:
[Problem] The purpose of the present invention is to provide: a catalyst with which it is possible to efficiently purify HC, CO, and NOx included in exhaust gas; a method for producing the same; and an exhaust gas purification method using the same. [Solution] A catalyst for exhaust gas purification which has at least two layers comprising a lower catalyst layer and an upper catalyst layer on a fire resistant three-dimensional structure, wherein the lower catalyst layer and the upper catalyst layer each independently include precious metal, alumina, and a cerium-zirconium composite oxide, and at least a portion of the upper catalyst layer includes a pore connecting substance that has a combustion decomposition temperature of 150 to 400°C, a precious metal precursor, alumina, and cerium-zirconium composite oxide, said catalyst for exhaust gas purification being formed by a production method that includes the steps of applying, on the lower catalyst layer, an upper catalyst layer forming slurry which has a content rate of the pore connecting substance of less than 20 mass% relative to the total solids when heated at 1000°C, and then retaining the same in an oxygen-containing gas at a temperature over -150°C and less than or equal to +50°C relative to the combustion decomposition temperature.
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Inventors:
KUNO HIROTAKA (JP)
NAKASHIMA MASASHI (JP)
OGINO YUJI (JP)
NAKASHIMA MASASHI (JP)
OGINO YUJI (JP)
Application Number:
PCT/JP2019/044192
Publication Date:
July 02, 2020
Filing Date:
November 11, 2019
Export Citation:
Assignee:
UMICORE SHOKUBAI JAPAN CO LTD (JP)
International Classes:
B01J23/63; B01D53/94; B01J27/053; B01J35/04; B01J35/10; B01J37/02; B01J37/08; F01N3/10; F01N3/28
Domestic Patent References:
| WO2018016606A1 | 2018-01-25 | |||
| WO2010044453A1 | 2010-04-22 |
Foreign References:
| JP2009045584A | 2009-03-05 | |||
| JP2017185465A | 2017-10-12 | |||
| JP2012020276A | 2012-02-02 | |||
| JP2011255378A | 2011-12-22 | |||
| JP2014509242A | 2014-04-17 | |||
| JP2010017694A | 2010-01-28 | |||
| JP2015066516A | 2015-04-13 | |||
| US20110200506A1 | 2011-08-18 | |||
| JP2018247137A | 2018-12-28 |
Other References:
See also references of EP 3903929A4
Attorney, Agent or Firm:
HATTA & ASSOCIATES (JP)
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