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公开(公告)号:US11577226B2
公开(公告)日:2023-02-14
申请号:US17107997
申请日:2020-12-01
申请人: Seiji Nakahigashi , Isao Chinzei , Shogo Shirakawa , Hiromasa Suzuki , Masahide Miura , Takahiro Nishio , Norimichi Shimano , Hiroki Nihashi , Mitsuyoshi Okada , Takashi Onozuka , Souta Akiyama , Hiromi Togashi , Takahiro Noguchi , Isao Naito
发明人: Seiji Nakahigashi , Isao Chinzei , Shogo Shirakawa , Hiromasa Suzuki , Masahide Miura , Takahiro Nishio , Norimichi Shimano , Hiroki Nihashi , Mitsuyoshi Okada , Takashi Onozuka , Souta Akiyama , Hiromi Togashi , Takahiro Noguchi , Isao Naito
摘要: The present disclosure provides an exhaust gas purification catalyst having an improved Rh activation, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the upstream portion contains Rh fine particles and Pt, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation σ of the particle size of 0.8 nm or less, and wherein the downstream portion contains Rh.
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公开(公告)号:US20210205790A1
公开(公告)日:2021-07-08
申请号:US17107997
申请日:2020-12-01
申请人: Seiji NAKAHIGASHI , Isao CHINZEI , Shogo SHIRAKAWA , Hiromasa SUZUKI , Masahide MIURA , Takahiro NISHIO , Norimichi SHIMANO , Hiroki NIHASHI , Mitsuyoshi OKADA , Takashi ONOZUKA , Souta AKIYAMA , Hiromi TOGASHI , Takahiro NOGUCHI , Isao NAITO
发明人: Seiji NAKAHIGASHI , Isao CHINZEI , Shogo SHIRAKAWA , Hiromasa SUZUKI , Masahide MIURA , Takahiro NISHIO , Norimichi SHIMANO , Hiroki NIHASHI , Mitsuyoshi OKADA , Takashi ONOZUKA , Souta AKIYAMA , Hiromi TOGASHI , Takahiro NOGUCHI , Isao NAITO
摘要: The present disclosure provides an exhaust gas purification catalyst having an improved Rh activation, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the upstream portion contains Rh fine particles and Pt, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation σ of the particle size of 0.8 nm or less, and wherein the downstream portion contains Rh.
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公开(公告)号:US20210301706A1
公开(公告)日:2021-09-30
申请号:US17211112
申请日:2021-03-24
申请人: Isao CHINZEI , Takahiro NISHIO , Shogo SHIRAKAWA , Masahide MIURA , Hiromasa SUZUKI , Yuki KIDO , Minoru ITO , Sho HOSHINO , Shin NAKAYAMA
发明人: Isao CHINZEI , Takahiro NISHIO , Shogo SHIRAKAWA , Masahide MIURA , Hiromasa SUZUKI , Yuki KIDO , Minoru ITO , Sho HOSHINO , Shin NAKAYAMA
摘要: Provided is an exhaust gas purification catalyst capable of reducing a noble metal amount while maintaining a catalyst performance, which comprises a substrate and at least three catalyst coating layers formed on the substrate, the first and third catalyst coating layers contain Pd as a catalyst metal and are formed in a range of a predetermined length from an upstream end surface in an exhaust gas flow direction, and the second catalyst coating layer contains Rh as a catalyst metal and is formed in a range of a predetermined length from a downstream end surface in the exhaust gas flow direction.
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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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公开(公告)号:US20210197176A1
公开(公告)日:2021-07-01
申请号:US17107224
申请日:2020-11-30
申请人: Isao CHINZEI , Seiji NAKAHIGASHI , Shogo SHIRAKAWA , Hiromasa SUZUKI , Masahide MIURA , Takahiro NISHIO , Norimichi SHIMANO , Hiroki NIHASHI , Hiromi TOGASHI , Mitsuyoshi OKADA , Takashi ONOZUKA , Souta AKIYAMA , Isao NAITO
发明人: Isao CHINZEI , Seiji NAKAHIGASHI , Shogo SHIRAKAWA , Hiromasa SUZUKI , Masahide MIURA , Takahiro NISHIO , Norimichi SHIMANO , Hiroki NIHASHI , Hiromi TOGASHI , Mitsuyoshi OKADA , Takashi ONOZUKA , Souta AKIYAMA , Isao NAITO
摘要: The present disclosure provides an exhaust gas purification catalyst having an improved low-temperature activity, which comprises a substrate and a catalyst coat layer formed on the substrate, wherein the catalyst coat layer contains Rh fine particles and a promoter comprising a Ce—Zr-based composite oxide and a Zr-based composite oxide not containing cerium oxide, wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation a of the particle size of 0.8 nm or less, and wherein the Rh fine particles are supported on each of the Ce—Zr-based composite oxide and the Zr-based composite oxide not containing cerium oxide.
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