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    EXHAUST GAS PURIFICATION CATALYST
    1.
    发明公开
    EXHAUST GAS PURIFICATION CATALYST 审中-公开

    公开(公告)号：EP3736035A1

    公开(公告)日：2020-11-11

    申请号：EP20170599.3

    申请日：2020-04-21

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA ,  CATALER CORPORATION

    发明人： CHINZEI, Isao ,  MIURA, Masahide ,  NAKAHIGASHI, Seiji ,  SUZUKI, Hiromasa ,  MORIKAWA, Akira ,  YAMAMOTO, Toshio ,  KATOH, Satoru ,  ONOZUKA, Takashi ,  ORI, Hirotaka ,  OKADA, Mitsuyoshi ,  HOSHINO, Sho

    IPC分类号： B01D53/94 ,  B01J35/10 ,  B01J37/00

    摘要： The present disclosure provides the exhaust gas purification catalyst with the improved purification performance under the high Ga condition and the transient state in which an A/F repeats rich and lean phases. The present disclosure relates to an exhaust gas purification catalyst comprising a catalyst coating layer on a substrate, the catalyst coating layer containing a noble metal, a composite oxide containing cerium oxide and zirconium oxide, and a composite oxide containing aluminum oxide, wherein in the catalyst coating layer: an average thickness of the coating layer is in a range from 20 µm to 100 µm; a porosity measured by a weight-in-water method is in a range from 50% by volume to 80% by volume; and high-aspect-ratio pores having an aspect ratio of 5 or more account for 0.5% by volume to 50% by volume of a whole volume of voids, the high-aspect-ratio pore having an equivalent circle diameter in a range from 2 µm to 50 µm in a cross-sectional image of a catalyst coating layer cross section perpendicular to an exhaust gas flow direction of the substrate and having an average aspect ratio in a range from 10 to 50, and wherein the noble metal is supported on peripheries of the voids, the composite oxide containing the cerium oxide and the zirconium oxide, and the composite oxide containing the aluminum oxide.

    EXHAUST GAS PURIFICATION CATALYST
    6.
    发明公开
    EXHAUST GAS PURIFICATION CATALYST 审中-公开

    公开(公告)号：EP3736036A1

    公开(公告)日：2020-11-11

    申请号：EP20172041.4

    申请日：2020-04-29

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA ,  CATALER CORPORATION

    发明人： CHINZEI, Isao ,  MIURA, Masahide ,  NAKAHIGASHI, Seiji ,  SUZUKI, Hiromasa ,  YAMAMOTO, Toshio ,  MORIKAWA, Akira ,  KATOH, Satoru ,  ONOZUKA, Takashi ,  ORI, Hirotaka ,  OKADA, Mitsuyoshi ,  HOSHINO, Sho

    IPC分类号： B01D53/94 ,  B01J23/63 ,  B01J35/00 ,  B01J35/04 ,  B01J35/10 ,  F01N3/10

    摘要： The present disclosure provides the exhaust gas purification catalyst with the improved purification performance under the high Ga condition and the atmosphere where the A/F is rich. The present disclosure relates to an exhaust gas purification catalyst including a catalyst coating layer on a substrate, the catalyst coating layer containing a noble metal and a metal oxide, wherein in the catalyst coating layer: an average thickness of the coating layer is in a range from 50 µm to 100 µm; a porosity measured by a weight-in-water method is in a range from 50% by volume to 80% by volume; and high-aspect-ratio pores having an aspect ratio of 5 or more account for 0.5% by volume to 50% by volume of a whole volume of voids, the high-aspect-ratio pore having an equivalent circle diameter in a range from 2 µm to 50 µm in a cross-sectional image of a catalyst coating layer cross section perpendicular to an exhaust gas flow direction of the substrate and having an average aspect ratio in a range from 10 to 50, and wherein when a surface side in contact with an exhaust gas in a thickness direction of the catalyst coating layer is defined as 0% and a side in contact with the substrate is defined as 100%, 80 % by mass or more of a total amount of the noble metal is present in a range from 0% to 25% or more and 70% or less.