Invention Grant
- Patent Title: Exhaust gas purification catalyst
- Patent Title (中): 废气净化催化剂
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Application No.: US13001683Application Date: 2009-06-26
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Publication No.: US08551908B2Publication Date: 2013-10-08
- Inventor: Akemi Satou , Masahiko Takeuchi , Keizo Hiraku , Yusuke Kawamura , Takahiro Fujiwara , Tadashi Suzuki , Naoki Takahashi
- Applicant: Akemi Satou , Masahiko Takeuchi , Keizo Hiraku , Yusuke Kawamura , Takahiro Fujiwara , Tadashi Suzuki , Naoki Takahashi
- Applicant Address: JP Toyota-shi, Aichi-ken
- Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee Address: JP Toyota-shi, Aichi-ken
- Agency: Finnegan, Henderson, Farabow, Garrett & Dunner, LLP
- Priority: JP2008-170769 20080630
- International Application: PCT/IB2009/006068 WO 20090626
- International Announcement: WO2010/001215 WO 20100107
- Main IPC: B01J23/00
- IPC: B01J23/00 ; B01J21/00

Abstract:
An exhaust gas purification catalyst includes: a lower catalyst layer that contains a ceria-zirconia mixed oxide having 50 to 70 mass % of CeO2 and 5 mass % or more of Pr2O3 and carries at least one of Pt and Pd; and an upper catalyst layer that contains at least zirconia and carries at least Rh, wherein the total amount of CeO2 per liter of the carrier base is 15 to 30 g. Because the amount of CeO2 is small, formation of H2S is suppressed and a high capability of adsorbing and releasing oxygen is brought out in spite of the small amount of CeO2.
Public/Granted literature
- US20110099987A1 EXHAUST GAS PURIFICATION CATALYST Public/Granted day:2011-05-05
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