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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：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：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：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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公开(公告)号：US10539056B2
公开(公告)日：2020-01-21
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：US10159934B2
公开(公告)日：2018-12-25
申请号：US15550070
申请日：2016-02-16
发明人： Ichiro Kitamura , Keiichi Narita , Yasutaka Nomura , Ryota Onoe , Yuta Morishita , Junji Kuriyama , Hiroshi Sekine , Akihito Inoue , Daisuke Ochiai , Jun Sawada , Naoto Miyoshi , Masahiko Takeuchi , Akemi Sato , Atsushi Tanaka
摘要： Provided is an exhaust gas purification catalyst that combines reduction of pressure loss and enhancement of purification performance. This invention provides an exhaust gas purification catalyst comprising a wall-flow-type substrate and first and second catalytic layers. The first catalytic layer is provided to the interior of a partition wall, in contact with an entrance cell, from an exhaust inlet-side end in the running direction, having a length L1 less than Lw. The second catalytic layer is provided to the interior of a partition wall, in contact with an exit cell, from an exhaust outlet-side end in the running direction, having a length L2 less than Lw. An internal portion of partition wall in contact with entrance cell has a substrate-exposing segment near the exhaust outlet-side end.
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公开(公告)号：US10112181B2
公开(公告)日：2018-10-30
申请号：US15553020
申请日：2016-02-17
发明人： Satoru Katoh , Toshitaka Tanabe , Masahide Miura , Hiromasa Suzuki , Hiroaki Naito , Hirotaka Ori , Keiichi Narita , Michihiko Takeuchi , Tatsuya Ohashi
IPC分类号： B01J23/63 , B01D53/94 , B01J35/02 , B01J35/10 , B01J37/02 , B01J37/08 , B01J35/04 , F01N3/28
摘要： A catalyst for purification of exhaust gas, wherein a substrate and a catalyst coat layer which is formed on a surface of the substrate and which comprises catalyst particles, wherein the catalyst coat layer has an average thickness in a range of 25 to 160 μm, and a void fraction in a range of 50 to 80% by volume as measured by a weight-in-water method, 0.5 to 50% by volume of all voids in the catalyst coat layer consist of high-aspect ratio pores which have equivalent circle diameters in a range of 2 to 50 μm in a cross-sectional image of a cross-section of the catalyst coat layer which the cross-section is perpendicular to a flow direction of exhaust gas in the substrate, and which have aspect ratios of 5 or higher, and the high-aspect ratio pores have an average aspect ratio in a range of 10 to 50.
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公开(公告)号：US20230032414A1
公开(公告)日：2023-02-02
申请号：US17788020
申请日：2020-12-02
申请人： Cataler Corporation
发明人： Kohei Takasaki , Tatsuya Ohashi , Keiichi Narita
IPC分类号： B01J23/44 , B01J27/224 , B01J21/04 , B01J23/10 , B01J35/04 , B01J35/10 , B01J35/00 , B01D53/94 , F01N3/20 , F01N3/28
摘要： The present invention provides an exhaust gas purification catalyst in which platinum group metal migration from a catalyst layer to a base material during high temperature duration is suppressed. The exhaust gas purification catalyst disclosed herein includes a base material, a catalyst layer, and an intermediate layer arranged between the base material and the catalyst layer. The base material contains SiC. The catalyst layer contains a platinum group metal as a catalyst component. The intermediate layer contains substantially no platinum group metal. A product of a thickness of the intermediate layer (μm) and a specific surface area (m2/g) of the intermediate layer is 1100 or more.
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公开(公告)号：US20220250038A1
公开(公告)日：2022-08-11
申请号：US17618000
申请日：2020-06-18
申请人： Cataler Corporation
发明人： Naoto Fujita , Keiichi Narita , Hiroto Imai
摘要： The present invention provides a chemically stable catalyst for methane removal that exhibits excellent methane removal performance. The catalyst material for methane removal 30 of the invention includes a carrier 32 made of alumina and a catalyst 34 made of at least one of palladium and palladium oxide and carried directly on the carrier 32. With an exhaust gas purification catalyst test piece using this catalyst material for methane removal 30, a 50% methane removal temperature, which is an environmental temperature at which a methane removal rate reaches 50%, is not more than 347° C., based on the methane removal rate at 25° C. Furthermore, a specific surface area of the carrier 32 is preferably not more than 80 m2/g.
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公开(公告)号：US11084022B2
公开(公告)日：2021-08-10
申请号：US16061493
申请日：2016-12-26
发明人： Kyosuke Murakami , Keiichi Narita , Satoshi Matsueda , Michio Tanaka , Tadatoshi Murota , Shigeru Ono , Tomonori Tahara
IPC分类号： B01J23/44 , B01D53/94 , B01J23/10 , B01J37/00 , B01J37/03 , B01J37/04 , B01J37/08 , F01N3/10 , F01N3/28
摘要： A Pd-supporting Zr-based composite oxide wherein by having a Zr-containing composite oxide support and Pd supported thereon and by showing, upon XAFS (X-ray absorption fine structure) analysis, a maximum peak in a Pd bond distance range of 2.500-3.500 Å, the maximum peak being located in a position of 3.050-3.110 Å.
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