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公开(公告)号：US20230405569A1
公开(公告)日：2023-12-21
申请号：US18337103
申请日：2023-06-19
申请人： Takahiro NISHIO , Shogo SHIRAKAWA , Takumi TOJO , Nobuyuki TAKAGI , Yosuke TODA , Sho HOSHINO , Shun SAKAMOTO
发明人： Takahiro NISHIO , Shogo SHIRAKAWA , Takumi TOJO , Nobuyuki TAKAGI , Yosuke TODA , Sho HOSHINO , Shun SAKAMOTO
CPC分类号： B01J35/0006 , B01J23/464 , B01J23/44 , B01J23/42 , B01J23/10 , B01D53/9472 , F01N3/2828 , B01D2255/1021 , B01D2255/1023 , B01D2255/1025 , B01D2255/908 , B01D2255/9207 , B01D2255/407 , B01D2255/2092 , B01D2255/20715 , B01D2255/2065 , B01D2258/012 , B01D2257/404 , B01D2257/702 , B01D2255/9035 , B01D2255/9032 , F01N2370/02
摘要： Provided is an exhaust gas purification catalyst having a catalyst performance and an OSC performance in a compatible manner in an air-fuel ratio (A/F) rich atmosphere where HC poisoning is likely to occur. The exhaust gas purification catalyst includes a substrate and a catalyst coating layer coated on the substrate. The catalyst coating layer includes a first catalyst coating layer containing Pd and/or Pt as a catalyst metal and a second catalyst coating layer containing Rh as a catalyst metal. The first catalyst coating layer is formed from an end portion in an upstream side with respect to an exhaust gas flow direction in the exhaust gas purification catalyst. The second catalyst coating layer includes a high specific surface area OSC material having a specific surface area of more than 40 m2/g, a medium specific surface area OSC material having a specific surface area of 4 m2/g to 40 m2/g, and a low specific surface area OSC material having a specific surface area of less than 4 m2/g.
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公开(公告)号：US20240139716A1
公开(公告)日：2024-05-02
申请号：US18488353
申请日：2023-10-17
申请人： Takahiro NISHIO , Nobuyuki Takagl , Takumi Tojo , Shogo Shirakawa , Kengo Shimizu , Sho Hoshino , Shun Sakamoto , Yosuke Toda
发明人： Takahiro NISHIO , Nobuyuki Takagl , Takumi Tojo , Shogo Shirakawa , Kengo Shimizu , Sho Hoshino , Shun Sakamoto , Yosuke Toda
IPC分类号： B01J23/56
CPC分类号： B01J23/56 , B01J2523/822 , B01J2523/824 , B01J2523/828
摘要： Provided is an exhaust gas purification catalyst providing a catalyst performance and an OSC performance at the same time even at low temperature. The present disclosure relates to an exhaust gas purification catalyst including a substrate and a catalyst coating layer coated on the substrate. The catalyst coating layer includes a first catalyst coating layer containing Pd and/or Pt and a second catalyst coating layer containing Rh. The first catalyst coating layer is formed from an end portion in an upstream side with respect to an exhaust gas flow direction in the exhaust gas purification catalyst. The second catalyst coating layer includes an upstream coating layer and a downstream coating layer. Rh in the upstream coating layer and the downstream coating layer are supported on specific carrier particles. Further, a particle diameter of Rh is controlled.
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公开(公告)号：US11725556B2
公开(公告)日：2023-08-15
申请号：US17682646
申请日：2022-02-28
申请人： Isao Chinzei , Takumi Tojo , Takahiro Nishio , Yosuke Toda , Hirotaka Ori , Minoru Ito , Sho Hoshino
发明人： Isao Chinzei , Takumi Tojo , Takahiro Nishio , Yosuke Toda , Hirotaka Ori , Minoru Ito , Sho Hoshino
IPC分类号： B01J21/04 , B01J21/06 , B01J23/02 , B01J23/10 , B01J23/42 , B01J23/44 , B01J23/46 , B01J23/56 , B01J23/58 , B01J23/63 , B01J35/04 , F01N3/10
CPC分类号： F01N3/105 , B01J21/04 , B01J21/066 , B01J23/10 , B01J23/42 , B01J23/44 , B01J23/464 , F01N3/101 , F01N2330/02 , F01N2370/02 , F01N2430/06
摘要： Provided is an exhaust gas purification catalyst having an improved catalyst performance while securing an OSC in an air-fuel ratio (A/F) rich atmosphere where HC poisoning is likely to occur. The present disclosure relates to an exhaust gas purification catalyst including a substrate and a catalyst coating layer coated on the substrate. The catalyst coating layer has an upstream coat layer formed from an end portion in an upstream side with respect to an exhaust gas flow direction in the exhaust gas purification catalyst and a downstream coat layer formed from an end portion in a downstream side with respect to the exhaust gas flow direction in the exhaust gas purification catalyst. The downstream coat layer includes Rh as a catalytic metal, alumina-ceria-zirconia complex oxide, and alkaline earth metal.
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公开(公告)号：US20220298942A1
公开(公告)日：2022-09-22
申请号：US17682646
申请日：2022-02-28
申请人： Isao CHINZEI , Takumi TOJO , Takahiro NISHIO , Yosuke TODA , Hirotaka ORI , Minoru ITO , Sho HOSHINO
发明人： Isao CHINZEI , Takumi TOJO , Takahiro NISHIO , Yosuke TODA , Hirotaka ORI , Minoru ITO , Sho HOSHINO
摘要： Provided is an exhaust gas purification catalyst having an improved catalyst performance while securing an OSC in an air-fuel ratio (A/F) rich atmosphere where HC poisoning is likely to occur. The present disclosure relates to an exhaust gas purification catalyst including a substrate and a catalyst coating layer coated on the substrate. The catalyst coating layer has an upstream coat layer formed from an end portion in an upstream side with respect to an exhaust gas flow direction in the exhaust gas purification catalyst and a downstream coat layer formed from an end portion in a downstream side with respect to the exhaust gas flow direction in the exhaust gas purification catalyst. The downstream coat layer includes Rh as a catalytic metal, alumina-ceria-zirconia complex oxide, and alkaline earth metal.
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