Invention Grant
- Patent Title: Exhaust gas purification catalyst
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Application No.: US16971147Application Date: 2018-08-23
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Publication No.: US11517881B2Publication Date: 2022-12-06
- Inventor: Hiroki Tanaka , Haruka Shimizu , Masaaki Inamura
- Applicant: Mitsui Mining & Smelting Co., Ltd.
- Applicant Address: JP Tokyo
- Assignee: Mitsui Mining & Smelting Co., Ltd.
- Current Assignee: Mitsui Mining & Smelting Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Rankin, Hill & Clark LLP
- Priority: JPJP2018-063119 20180328
- International Application: PCT/JP2018/031211 WO 20180823
- International Announcement: WO2019/187199 WO 20191003
- Main IPC: B01J23/44
- IPC: B01J23/44 ; B01D53/94 ; B01J23/46 ; B01J35/00 ; F01N3/10

Abstract:
The present invention provides an exhaust gas purifying catalyst including a first catalyst layer (12). The first catalyst layer (12) includes a first section (14) and a second section (15) in an exhaust gas flow direction, the first section (14) being located on an upstream side in the exhaust gas flow direction relative to the second section (15). The first section (14) and the second section (15) both contain a catalytically active component including a specific element. A concentration of the specific element is higher in the first section (14) than in the second section (15). A concentration gradient of the specific element contained in the first section (14) in a thickness direction of the catalyst layer (12) is milder than a concentration gradient of the specific element contained in the second section (15) in the thickness direction.
Public/Granted literature
- US20220193638A1 EXHAUST GAS PURIFICATION CATALYST Public/Granted day:2022-06-23
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