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公开(公告)号:US10450917B2
公开(公告)日:2019-10-22
申请号:US15560625
申请日:2016-03-24
发明人: Hiromasa Suzuki , Masahide Miura , Yoshinori Saito , Satoru Katoh , Toshitaka Tanabe , Tetsuhiro Hirao , Tatsuya Ohashi , Hiroaki Naito , Hirotaka Ori , Michihiko Takeuchi , Keiichi Narita
IPC分类号: F01N3/10 , B01J23/63 , B01D53/94 , B01J35/10 , F01N3/28 , B01J37/02 , B01J35/02 , B01J37/00 , B01J35/00 , B01J37/08
摘要: An object of the present invention is to provide an exhaust gas purification catalyst which can exhibit high durability and warm-up performance. The present invention relates to an exhaust gas purification catalyst comprising a substrate and a catalyst coating layer formed on the substrate, wherein the catalyst coating layer comprises catalyst particles, the catalyst coating layer having an upstream region extending by 40 to 60% of the entire length of the substrate from an upstream end of the catalyst in the direction of an exhaust gas flow and a downstream region corresponding to the remainder portion of the catalyst coating layer, the composition of the catalyst particle of the upstream region being different from that of the downstream region. The upstream region in the direction of an exhaust gas flow has a structure where a void is included in a large number, and furthermore high-aspect-ratio pores having an aspect ratio of 5 or more account for a certain percentage or more of the whole volume of voids. Thus, the exhaust gas purification catalyst exhibits enhanced purification performance.
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公开(公告)号:US11224840B2
公开(公告)日:2022-01-18
申请号:US15560772
申请日:2016-03-24
发明人: Hiromasa Suzuki , Masahide Miura , Yoshinori Saito , Satoru Katoh , Toshitaka Tanabe , Tetsuhiro Hirao , Tatsuya Ohashi , Hiroaki Naito , Hirotaka Ori , Michihiko Takeuchi , Keiichi Narita
IPC分类号: B01J23/10 , B01D53/94 , B01J37/08 , B01J35/10 , B01J37/02 , B01J35/02 , B01J35/00 , B01J23/63 , B01J37/00 , B01J23/56 , B01J35/04 , F01N3/10 , F01N3/28
摘要: An object of the present invention is to provide an exhaust gas purification catalyst which can exhibit sufficient purification performance even under a high Ga condition. The present invention relates to an exhaust gas purification catalyst comprising a substrate and a catalyst coating layer formed on the substrate, wherein the catalyst coating layer comprises catalyst particles, the catalyst coating layer having an upstream region extending by 40 to 60% of the entire length of the substrate from an upstream end of the catalyst in the direction of an exhaust gas flow and a downstream region corresponding to the remainder portion of the catalyst coating layer, the composition of the catalyst particle of the upstream region being different from that of the downstream region. The downstream region in the direction of an exhaust gas flow has a structure where a void is included in a large number, and furthermore high-aspect-ratio pores having an aspect ratio of 5 or more account for a certain percentage or more of the whole volume of voids. Thus, the exhaust gas purification catalyst exhibits enhanced purification performance.
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公开(公告)号:US11426710B2
公开(公告)日:2022-08-30
申请号:US17088767
申请日:2020-11-04
发明人: Takahiro Nishio , Shogo Shirakawa , Masahide Miura , Isao Chinzei , Seiji Nakahigashi , Norimichi Shimano , Hiromi Togashi , Hiroki Nihashi , Mitsuyoshi Okada , Takashi Onozuka , Souta Akiyama , Isao Naito
摘要: The present disclosure relates to an exhaust gas control catalyst including a base and a catalyst coating layer having a two-layer structure on the base. The catalyst coating layer includes a lower layer on the base, and an upper layer on the lower layer. The upper layer of the catalyst coating layer contains Rh particles in which a mean particle diameter measured by observation using a transmission electron microscope is 1.0 nm or more and 2.0 nm or less and a particle-diameter standard deviation σ is 0.8 nm or less. A length of the upper layer from an end face on a downstream side in an exhaust gas flow direction falls within a range of 70% or more and 100% or less of a total length of the base.
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公开(公告)号:US10413895B2
公开(公告)日:2019-09-17
申请号:US15560706
申请日:2016-03-24
发明人: Hiromasa Suzuki , Masahide Miura , Yoshinori Saito , Satoru Katoh , Toshitaka Tanabe , Tetsuhiro Hirao , Tatsuya Ohashi , Hiroaki Naito , Hirotaka Ori , Michihiko Takeuchi , Keiichi Narita
IPC分类号: B01J23/54 , B01J23/63 , B01J35/10 , B01J37/00 , B01J37/02 , B01D53/94 , F01N3/28 , B01J37/08 , B01J35/02
摘要: When the amount of coating is increased in a two-layer catalyst or the like containing two noble metals in respective different layers, gas diffusivity in the catalyst and use efficiency of a catalytic active site are reduced to thereby reduce purification performance. In view of this, an organic fiber having a predetermined shape is used as a pore-forming material in formation of an uppermost catalyst coating layer of a multi-layer catalyst, to thereby form an uppermost catalyst coating layer having a high-aspect-ratio pore excellent in connectivity and therefore excellent gas diffusivity.
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公开(公告)号:US10112180B2
公开(公告)日:2018-10-30
申请号:US15026760
申请日:2014-10-02
发明人: Akira Morikawa , Kae Konishi , Toshitaka Tanabe , Akihiko Suda , Masahide Miura , Isao Chinzei , Hiromasa Suzuki , Akiya Chiba , Kosuke Iizuka
IPC分类号: B01J23/10 , C01G25/00 , C04B35/488 , B01D53/94 , C04B35/626 , B01J37/03 , B01J37/04 , B01J23/63 , B01J23/66 , B01J35/00 , B01J35/02 , B01J37/02 , B01J23/00 , C01F17/00 , B01J37/08 , B01J37/00
摘要: A ceria-zirconia composite oxide includes at least one of lanthanum, yttrium, and praseodymium. A rate of a total content of the at least one rare earth element to a total content of cerium and zirconium is 0.1 at % to 4.0 at %. A content of the rare earth element present in near-surface regions, which are at a distance of less than 50 nm from surfaces of primary particles of the ceria-zirconia composite oxide, accounts for 90 at % or more of the total content of the rare earth element. An average particle size of the primary particles of the ceria-zirconia composite oxide is 2.2 μm to 4.5 μm. After a predetermined durability test, the intensity ratio I(14/29) of a diffraction line at 2θ=14.5° to a diffraction line at 2θ=29° and the intensity ratio I(28/29) of a diffraction line at 2θ=28.5° to the diffraction line at 2θ=29° respectively satisfy the following conditions: I(14/29)≥0.02, and I(28/29)≤0.08.
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公开(公告)号:US10065179B2
公开(公告)日:2018-09-04
申请号:US14910378
申请日:2014-08-05
发明人: Akira Morikawa , Kae Konishi , Toshitaka Tanabe , Akihiko Suda , Masahide Miura , Isao Chinzei , Hiromasa Suzuki , Akiya Chiba , Kosuke Iizuka
IPC分类号: B01J23/10 , B01J37/00 , B01J37/12 , B01J37/14 , B01J37/03 , B01J23/00 , B01D53/94 , B01J37/16 , B01J23/63 , B01J35/00 , B01J35/02 , C04B35/626 , C04B35/488 , C01G25/00 , C04B35/50 , B01J37/08
摘要: A ceria-zirconia-based composite oxide containing a composite oxide of ceria and zirconia is provided, in which primary particles having a particle diameter of 1.5 to 4.5 μm account for, on a particle number basis, at least 50% of all primary particles in the ceria-zirconia-based composite oxide, and the molar ratio of cerium to zirconium in the ceria-zirconia-based composite oxide is between 43:57 and 55:45.
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公开(公告)号:US09993804B2
公开(公告)日:2018-06-12
申请号:US15482045
申请日:2017-04-07
发明人: Yoshinori Saito , Masahide Miura , Tetsuhiro Hirao , Masanao Sato , Hirotaka Ori
IPC分类号: B01J21/04 , B01J21/06 , B01J21/08 , B01J21/12 , B01J23/10 , B01J23/40 , B01J23/42 , B01J23/44 , B01J23/46 , B01J23/56 , B01J23/63 , B01J35/02 , B01J35/04 , B01J37/00 , B01J37/02
CPC分类号: B01J23/63 , B01D53/945 , B01D2255/1025 , B01D2255/2061 , B01D2255/2063 , B01D2255/2068 , B01D2255/2092 , B01D2255/407 , B01D2255/92 , B01D2255/9202 , B01D2255/9205 , B01J23/464 , B01J35/002 , B01J35/023 , B01J37/0036 , B01J37/0215 , B01J37/08
摘要: A catalyst for exhaust gas purification is described which includes a substrate and a catalyst coating layer provided on the substrate. The catalyst coating layer includes first and second metal oxide particles. The first metal oxide particles have a catalyst metal supported thereon, and the second metal oxide particles do not have a catalyst metal supported thereon. The first and second metal oxide particles have a specific particle size. This is because, when the sizes of the particles supporting the catalyst metal remain relatively large but the sizes of the particles not supporting a catalyst metal are minimized, it is possible to decrease the thickness of the catalyst coating layer while maintaining durability and improving gas diffusibility of the coating layer. Therefore, a thickness of the catalyst coating is decreased without decreasing durability, and the catalyst can exhibit high exhaust gas purification performance even under high load conditions.
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公开(公告)号:US09931614B2
公开(公告)日:2018-04-03
申请号:US14897940
申请日:2014-06-12
发明人: Akira Morikawa , Kae Konishi , Toshitaka Tanabe , Akihiko Suda , Masahide Miura , Hiromasa Suzuki , Isao Chinzei , Akiya Chiba , Kosuke Iizuka
CPC分类号: B01J23/10 , B01J37/0009 , B01J37/12 , B01J37/16 , C01G25/00 , C01P2002/50 , C01P2002/74 , C01P2004/61 , C01P2006/12 , B01J2523/00 , B01J2523/3712 , B01J2523/48 , B01J2523/3706 , B01J2523/36 , B01J2523/3718
摘要: A ceria-zirconia-based composite oxide including a composite oxide containing ceria and zirconia, wherein the ceria-zirconia-based composite oxide contains at least one member selected from the group consisting of praseodymium, lanthanum, and yttrium in an amount of 0.5 to 5.0 mol % relative to a total amount of the cations contained in the ceria-zirconia-based composite oxide, where the ratio of the content of both cerium and the at least one member selected from the group consisting of praseodymium, lanthanum, and yttrium in the ceria-zirconia-based composite oxide to the content of zirconium therein ([cerium and the at least one member selected from the group consisting of praseodymium, lanthanum, and yttrium]:[zirconium]) is in the range of 43:57 to 48:52 by mole ratio.
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公开(公告)号:US10913051B2
公开(公告)日:2021-02-09
申请号:US15974060
申请日:2018-05-08
发明人: Akira Morikawa , Kae Konishi , Toshitaka Tanabe , Akihiko Suda , Masahide Miura , Isao Chinzei , Hiromasa Suzuki , Akiya Chiba , Kosuke Iizuka
IPC分类号: B01J23/10 , C01G25/00 , C04B35/488 , C04B35/50 , C04B35/626 , B01J37/16 , B01J23/00 , B01J23/63 , B01J35/00 , B01J35/02 , B01J37/00 , B01D53/94 , B01J37/03 , B01J37/14 , B01J37/12 , B01J37/08
摘要: A ceria-zirconia-based composite oxide containing a composite oxide of ceria and zirconia is provided, in which primary particles having a particle diameter of 1.5 to 4.5 μm account for, on a particle number basis, at least 50% of all primary particles in the ceria-zirconia-based composite oxide, and the molar ratio of cerium to zirconium in the ceria-zirconia-based composite oxide is between 43:57 and 55:45.
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公开(公告)号:US10731532B2
公开(公告)日:2020-08-04
申请号:US15561738
申请日:2016-03-24
发明人: Hiromasa Suzuki , Masahide Miura , Yoshinori Saito , Satoru Katoh , Toshitaka Tanabe , Tetsuhiro Hirao , Tatsuya Ohashi , Hiroaki Naito , Hirotaka Ori , Michihiko Takeuchi , Keiichi Narita
IPC分类号: F01N3/28 , F01N3/00 , B01J35/10 , B01J37/02 , B01J23/63 , F01N3/10 , B01D53/94 , B01J37/00 , B01D53/86 , B01J23/56 , B01J37/04 , B01J37/08 , B01J35/02
摘要: The problem of the present invention is to provide an exhaust gas purification catalyst which can exhibit sufficient purification performance under a high Ga condition while having a resistance to stress such as high-temperature and poisonous substances. The present invention relates to an exhaust gas purification catalyst comprising two or more catalyst coating layers on a substrate, wherein a lower catalyst coating layer that is present lower with respect to an uppermost catalyst coating layer has a structure where a large number of voids are included and high-aspect-ratio pores having an aspect ratio of 5 or more account for a certain proportion or more of the whole volume of voids, thereby to improve gas diffusivity in the lower catalyst coating layer.
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