Invention Grant
- Patent Title: Multi-region TWC catalysts for gasoline engine exhaust gas treatments
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Application No.: US17248004Application Date: 2021-01-05
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Publication No.: US11642655B2Publication Date: 2023-05-09
- Inventor: Takeshi Kadono , Kenji Tanikawa
- Applicant: JOHNSON MATTHEY PUBLIC LIMITED COMPANY
- Applicant Address: GB London
- Assignee: Johnson Matthey Public Limited Company
- Current Assignee: Johnson Matthey Public Limited Company
- Current Assignee Address: GB London
- Agent Ni Yan
- Main IPC: B01J21/06
- IPC: B01J21/06 ; B01J23/10 ; B01J23/44 ; B01J23/46 ; B01J23/63 ; B01J35/00 ; B01J35/02 ; F01N3/10 ; F01N3/28 ; B01J37/03

Abstract:
A catalytic article for treating exhaust gas comprising: a first catalytic region beginning at the inlet end and extending for less than the axial length L, wherein the first catalytic region comprises a first palladium component and a first oxygen storage capacity (OSC) material comprising ceria; a second catalytic region beginning at the outlet end and extending for less than the axial length L, wherein the second catalytic region comprises a second palladium component and a second OSC material comprising ceria; a third catalytic region beginning at the outlet end and extending for less than the axial length L, wherein the third catalytic region comprises a third rhodium component and a third OSC material comprising ceria; wherein at least a portion of the first catalytic region is not covered by the second catalytic region and/or the third catalytic region; and wherein (a) the ceria amount in the first catalytic region is less than 50% of the total ceria amount in the first, second, and third catalytic regions; or (b) the ceria loading in the first catalytic region is less than 50% of the sum of the ceria loading in the first, second, and third catalytic regions.
Public/Granted literature
- US20210205788A1 NOVEL MULTI-REGION TWC CATALYSTS FOR GASOLINE ENGINE EXHAUST GAS TREATMENTS Public/Granted day:2021-07-08
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