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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：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：US11719144B2
公开(公告)日：2023-08-08
申请号：US17121245
申请日：2020-12-14
申请人： Norimichi Shimano , Shogo Shirakawa , Masahide Miura , Isao Chinzei , Seiji Nakahigashi , Hiroki Nihashi , Hiromi Togashi , Tomomasa Aikawa , Isao Naito
发明人： Norimichi Shimano , Shogo Shirakawa , Masahide Miura , Isao Chinzei , Seiji Nakahigashi , Hiroki Nihashi , Hiromi Togashi , Tomomasa Aikawa , Isao Naito
CPC分类号： F01N3/105 , B01J23/42 , B01J23/464 , B01J35/0006 , B01J35/023 , B01J35/026 , B01J37/0215 , F01N2370/02 , F01N2510/0684 , F01N2570/16
摘要： The present disclosure provides an exhaust gas purification catalyst having improved durability, 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 downstream portion contains Rh fine particles, and 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.
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公开(公告)号：US20210199037A1
公开(公告)日：2021-07-01
申请号：US17121245
申请日：2020-12-14
申请人： Norimichi Shimano , Shogo Shirakawa , Masahide Miura , Isao Chinzei , Seiji Nakahigashi , Hiroki Nihashi , Hiromi Togashi , Tomomasa Aikawa , Isao Naito
发明人： Norimichi Shimano , Shogo Shirakawa , Masahide Miura , Isao Chinzei , Seiji Nakahigashi , Hiroki Nihashi , Hiromi Togashi , Tomomasa Aikawa , Isao Naito
摘要： The present disclosure provides an exhaust gas purification catalyst having improved durability, 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 downstream portion contains Rh fine particles, and 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.
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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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