Title:
EXHAUST GAS CLEANING CATALYST AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/110379
Kind Code:
A1
Abstract:
The invention is an exhaust gas cleaning catalyst for cleaning exhaust gas discharged from an internal combustion engine, comprising: a wall-flow type substrate having, delineated by a porous partition wall, an introduction side cell, the end portion on the exhaust gas introduction side of which is open, and adjacent to the introduction side cell, a discharge side cell, the end portion on the exhaust gas discharge side of which is open; and a catalyst layer formed within the partition wall. The catalyst layer comprises a first region formed so as to follow the direction in which the partition wall extends from the end portion of the exhaust gas introduction side, a second region formed so as to follow the direction in which the partition wall extends from the end portion of the exhaust gas discharge side, and a third region wherein the first region and the second region overlap with one another. The ratio (Din/Dmid), of the pore diameter Din calculated from the pore distribution in the first region, over the pore diameter Dmid calculated from the pore distribution in the third region, is 1.2 or higher. The ratio (Dout/Dmid), of the pore diameter Dout calculated from the pore distribution in the second region, over the pore diameter Dmid, is 1.2 or higher.
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Inventors:
SHIROTORI MAHIRO (JP)
TAKAHASHI YOSHINORI (JP)
TAKAHASHI YOSHINORI (JP)
Application Number:
PCT/JP2019/032177
Publication Date:
June 04, 2020
Filing Date:
August 16, 2019
Export Citation:
Assignee:
N E CHEMCAT CORP (JP)
International Classes:
B01J35/04; B01D53/94; B01J23/63; B01J35/10; B01J37/02; F01N3/035; F01N3/28
Domestic Patent References:
| WO2016060048A1 | 2016-04-21 | |||
| WO2016133087A1 | 2016-08-25 | |||
| WO2008136232A1 | 2008-11-13 |
Foreign References:
| JP2010167366A | 2010-08-05 | |||
| JP2009160547A | 2009-07-23 | |||
| JP2017185464A | 2017-10-12 |
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (JP)
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