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

IPC分类号： F01N3/10 ,  B01J23/42 ,  B01J23/44 ,  B01J23/46 ,  B01J21/04 ,  B01J21/06 ,  B01J23/10

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.

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

IPC分类号： B01J35/00 ,  B01J23/46 ,  B01J23/44 ,  B01J23/42 ,  B01J23/10 ,  B01D53/94 ,  F01N3/28

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.