Title:
GASOLINE ENGINE EXHAUST GAS PURIFICATION CATALYST AND EXHAUST GAS PURIFICATION SYSTEM USING SAME
Document Type and Number:
WIPO Patent Application WO/2023/162302
Kind Code:
A1
Abstract:
The present invention provides a gasoline engine exhaust gas purification catalyst which exhibits high post-endurance NH3 purification performance. The gasoline engine exhaust gas purification catalyst disclosed here is configured so as to be disposed on an exhaust path of a gasoline engine. The exhaust gas purification catalyst comprises a base material, an NH3 adsorption layer containing zeolite, and catalyst layer containing a catalytic noble metal. The NH3 adsorption layer is laminated with the catalyst layer in such a manner as to be positioned on the side closer to the base material than the catalyst layer. The NH3 adsorption layer has a front portion which is positioned on the upstream side in an exhaust gas flow direction when the catalyst is disposed on the exhaust path and a rear portion which is positioned on the downstream side in the exhaust gas flow direction with respect to the front portion. The front portion contains metal-supported zeolite. The rear portion contains proton-type zeolite. The catalyst layer covers the front portion and the rear portion of the NH3 adsorption layer.
Inventors:
OGAWA RYOICHI (JP)
OHASHI TATSUYA (JP)
OHASHI TATSUYA (JP)
Application Number:
PCT/JP2022/033405
Publication Date:
August 31, 2023
Filing Date:
September 06, 2022
Export Citation:
Assignee:
CATALER CORP (JP)
International Classes:
B01J29/76; B01D53/94; B01J35/04; F01N3/28
Domestic Patent References:
| WO2020226127A1 | 2020-11-12 |
Foreign References:
| JP2017533093A | 2017-11-09 | |||
| JP2006314989A | 2006-11-24 | |||
| JP2009144599A | 2009-07-02 |
Attorney, Agent or Firm:
ABE, Makoto (JP)
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