Patents by Inventor Hirohito Hirata
Hirohito Hirata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240024816Abstract: The present disclosure provides an exhaust gas purification catalyst with increased catalytic activity. The exhaust gas purification catalyst comprises a metal oxide support and Rh particles supported on the metal oxide support, wherein the metal oxide support is doped with a cation having a higher oxidation number than the cation of the metal oxide support. The metal oxide support may be a SrTiO3 support doped with greater than 0 mol % and 8 mol % or lower Nb, a ZrO2 support doped with 5 mol % to 20 mol % Nb, or an Al2O3 support doped with greater than 0 mol % and 7 mol % or lower Ti.Type: ApplicationFiled: July 18, 2023Publication date: January 25, 2024Inventors: Toshimasa Hara, Motohisa Kado, Taizo Yoshinaga, Hirohito Hirata, Takahiro Suzuki, Shunsuke Oishi, Kazuyoshi Tsukamoto, Fumiyasu Oba
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Patent number: 10731531Abstract: An internal combustion engine 1 is provided, in an exhaust passage thereof with an electrochemical reactor including: an ion conductive solid electrolyte layer; an anode layer arranged on a surface of the solid electrolyte layer; and a cathode layer arranged on a surface of the solid electrolyte layer and able to hold NOX. The engine includes a current control device for controlling the current supplied to the electrochemical reactor so as to flow from the anode layer through the solid electrolyte layer to the cathode layer. The current control device is configured so as to supply current to the electrochemical reactor at least temporarily while that internal combustion engine is stopped.Type: GrantFiled: April 30, 2019Date of Patent: August 4, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Keishi Takada, Tetsuya Sakuma, Hiromasa Nishioka, Hiroshi Otsuki, Hirohito Hirata, Yoshiyuki Sakamoto, Tsuyoshi Hamaguchi, Chika Kato, Yuji Sakakibara, Takashi Kuzuya
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Publication number: 20190345860Abstract: An internal combustion engine 1 is provided, in an exhaust passage thereof with an electrochemical reactor including: an ion conductive solid electrolyte layer; an anode layer arranged on a surface of the solid electrolyte layer; and a cathode layer arranged on a surface of the solid electrolyte layer and able to hold NOX. The engine includes a current control device for controlling the current supplied to the electrochemical reactor so as to flow from the anode layer through the solid electrolyte layer to the cathode layer. The current control device is configured so as to supply current to the electrochemical reactor at least temporarily while that internal combustion engine is stopped.Type: ApplicationFiled: April 30, 2019Publication date: November 14, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Keishi TAKADA, Tetsuya SAKUMA, Hiromasa NISHIOKA, Hiroshi OTSUKI, Hirohito HIRATA, Yoshiyuki SAKAMOTO, Tsuyoshi HAMAGUCHI, Chika KATO, Yuji SAKAKIBARA, Takashi KUZUYA
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Patent number: 9751075Abstract: A satisfactory oxygen storage material and a method for producing it are provided. The oxygen storage material comprises zirconia particles with a ceria-zirconia complex oxide supported on the zirconia particles. The ceria-zirconia complex oxide includes a pyrochlore phase and has a mean crystallite diameter of 10 nm to 22.9 nm.Type: GrantFiled: June 12, 2015Date of Patent: September 5, 2017Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITYInventors: Satoshi Nagao, Takashi Minami, Shinichi Matsumoto, Hirohito Hirata, Masakuni Ozawa
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Publication number: 20160214088Abstract: The present invention relates to an exhaust gas purification catalyst that can homogeneously inhibit growth of a plurality of the fine particles at high temperature, and prevent lowering in catalytic activity, as well as a method for producing it. The exhaust gas purification catalyst of the present invention has fine composite metal particles containing a platinum-group metal and tungsten. Moreover, in the exhaust gas purification catalyst of the present invention, when the fine composite metal particles in the exhaust gas purification catalyst have been analyzed by STEM-EDX, the tungsten content of at least 80% of the fine composite metal particles based on number, is in the range of 10% to 350% of the mean content of tungsten in a plurality of the fine composite metal particles.Type: ApplicationFiled: January 27, 2016Publication date: July 28, 2016Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITYInventors: Shogo SHIRAKAWA, Hirohito HIRATA, Tatsuya MIYAZAKI, Megumi YANAGIDA, Tsukasa TORIMOTO
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Patent number: 9358527Abstract: An exhaust gas purification catalyst of the present invention includes a catalyst support and a plurality of bimetallic particles supported thereon wherein the bimetallic particles consist of gold and cobalt and have an average particle size of greater than 0 nm but 100 nm or less. A method of the present invention includes heating a mixed solution containing a gold salt, a cobalt salt, a solvent and an inorganic reducing agent to a temperature sufficient to reduce gold and cobalt, thereby producing bimetallic particles consisting of gold and cobalt, and supporting the produced bimetallic particles on the catalyst support.Type: GrantFiled: July 9, 2012Date of Patent: June 7, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Naoto Nagata, Hirohito Hirata, Kimiyasu Ono
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Publication number: 20150375202Abstract: [SUMMARY] [PURPOSE] To provide a satisfactory oxygen storage material and a method for producing it. [SOLUTION MEANS] An oxygen storage material comprising: zirconia particles and a ceria-zirconia complex oxide supported on them, wherein the ceria-zirconia complex oxide includes a pyrochlore phase, and has a mean crystallite diameter of 10 nm to 22.9 nm.Type: ApplicationFiled: June 12, 2015Publication date: December 31, 2015Inventors: Satoshi NAGAO, Takashi MINAMI, Shinichi MATSUMOTO, Hirohito HIRATA, Masakuni OZAWA
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Patent number: 9126846Abstract: A method of synthesizing metal composite oxide, the method including: a step of separately introducing into a high-speed stirring apparatus a ceria composite oxide microparticle colloid having a mean particle diameter of 10 nm or less after adding a dispersant and an alumina microparticle colloid having a mean particle diameter of 10 nm or less after adding a dispersant; a step of synthesizing alumina-ceria composite oxide microparticles by allowing the ceria composite oxide microparticles and the alumina microparticles that have been introduced into the high-speed stirring apparatus to react in a microscopic space; and a step of applying a shearing force of 17000 sec?1 or more to the alumina-ceria composite oxide microparticles.Type: GrantFiled: December 6, 2010Date of Patent: September 8, 2015Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Satoshi Nagao, Kimiyasu Ono, Hirohito Hirata, Akihiko Suda, Kimitoshi Sato, Kae Yamamura, Akira Morikawa
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Patent number: 9084988Abstract: The present invention relates to a catalyst able to exhibit an NOx purification performance at a low temperature and/or in an oxidizing atmosphere, that is, a nitrogen oxides purification catalyst composed of particles having an average particle size of 0.2 to 100 nm and including gold atoms and iron atoms in a state of close proximity.Type: GrantFiled: March 13, 2014Date of Patent: July 21, 2015Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, CAMBRIDGE ENTERPRISE LIMITEDInventors: Mayuko Osaki, Hirohito Hirata, Naoyuki Hara, Brian Johnson, Andrew Wheatley, Helen Skelton, Muriel Lepage
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Patent number: 9079167Abstract: The invention relates to a catalyst able to exhibit an NOX purification performance at a low temperature and/or in an oxidizing atmosphere, that is, a nitrogen oxide purification catalyst including gold atoms and nickel atoms in a solid and a state of close proximity.Type: GrantFiled: March 13, 2014Date of Patent: July 14, 2015Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, CAMBRIDGE ENTERPRISE LIMITEDInventors: Mayuko Osaki, Hirohito Hirata, Naoyuki Hara, Brian Johnson, Andrew Wheatley, Helen Skelton, Muriel Lepage
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Publication number: 20150151282Abstract: An exhaust gas purification catalyst of the present invention includes a catalyst support and a plurality of bimetallic particles supported thereon wherein the bimetallic particles consist of gold and cobalt and have an average particle size of greater than 0 nm but 100 nm or less. A method of the present invention includes heating a mixed solution containing a gold salt, a cobalt salt, a solvent and an inorganic reducing agent to a temperature sufficient to reduce gold and cobalt, thereby producing bimetallic particles consisting of gold and cobalt, and supporting the produced bimetallic particles on the catalyst support.Type: ApplicationFiled: July 9, 2012Publication date: June 4, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Naoto Nagata, Hirohito Hirata, Kimiyasu Ono
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Patent number: 8921259Abstract: An exhaust gas purification catalyst for removing CO or HC, which contains a carrier and an alloy of palladium and silver supported on this carrier.Type: GrantFiled: September 29, 2010Date of Patent: December 30, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Naoto Nagata, Hirohito Hirata, Yusaku Inatomi
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Publication number: 20140305105Abstract: An exhaust gas purification system provided with an NOX purification catalyst reducing the amount of use of precious metals and/or able to exhibit an NOX purification performance at a low temperature and/or in an oxidizing atmosphere and having an NOX purification performance even for an exhaust gas composition containing hydrocarbons and oxygen together with a low temperature and/or oxidizing atmosphere, that is, an exhaust gas purification system provided with an NOX purification catalyst provided in an exhaust gas passage and comprised of carrier particles on which nanoparticles in which gold atoms and nickel atoms are included in a state in close proximity are carried and an oxidation catalyst oxidizing hydrocarbons in exhaust gas at a position at an upstream side of the NOX purification catalyst.Type: ApplicationFiled: June 27, 2014Publication date: October 16, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mayuko OSAKI, Hirohito HIRATA, Muriel LEPAGE
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Publication number: 20140194281Abstract: The invention relates to a catalyst able to exhibit an NOX purification performance at a low temperature and/or in an oxidizing atmosphere, that is, a nitrogen oxide purification catalyst including gold atoms and nickel atoms in a solid and a state of close proximity.Type: ApplicationFiled: March 13, 2014Publication date: July 10, 2014Applicants: CAMBRIDGE ENTERPRISE LIMITED, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mayuko OSAKI, Hirohito HIRATA, Naoyuki HARA, Brian JOHNSON, Andrew WHEATLEY, Helen SKELTON, Muriel LEPAGE
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Publication number: 20140194280Abstract: The present invention relates to a catalyst able to exhibit an NOx purification performance at a low temperature and/or in an oxidizing atmosphere, that is, a nitrogen oxides purification catalyst composed of particles having an average particle size of 0.2 to 100 nm and including gold atoms and iron atoms in a state of close proximity.Type: ApplicationFiled: March 13, 2014Publication date: July 10, 2014Applicants: CAMBRIDGE ENTERPRISE LIMITED, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mayuko OSAKI, Hirohito HIRATA, Naoyuki HARA, Brian JOHNSON, Andrew WHEATLEY, Helen SKELTON, Muriel LEPAGE
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Patent number: 8484952Abstract: A device for purification of exhaust gas including: an exhaust gas passage 15 connected to an internal combustion engine 10; a particulate matter trapping device 30 which is disposed in the exhaust gas passage 15, and which traps particulate matters in exhaust gas; ozone supply means 40 which is connected to the exhaust gas passage 15 and on an upstream side of the particulate matter trapping device 30, and which can supply ozone to the particulate matter trapping device 30; and an NO oxidizing catalyst 20 which is disposed in the exhaust gas passage 15 and on an upstream of the ozone supply means 40, and which oxidizes NO in the exhaust gas.Type: GrantFiled: June 6, 2007Date of Patent: July 16, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yuji Sakakibara, Yoshihiko Itoh, Koji Yokota, Kouzi Banno, Hirohito Hirata, Masaru Kakinohana, Masaya Ibe
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Patent number: 8418447Abstract: The invention makes use of an exhaust gas catalyst, comprising an active component comprising at least one type of metal from noble metals and transition metals; NOx-absorbing material for absorbing and releasing nitrogen oxides according to the surrounding nitrogen oxide concentration; and compounds represented by A2O2SO4 and/or A2O2S (A is a rare earth element).Type: GrantFiled: July 20, 2011Date of Patent: April 16, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventor: Hirohito Hirata
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Publication number: 20120270729Abstract: The present invention relates to a catalyst for purification of nitrogen oxides, the catalyst comprising a solid in which Au and Fe atoms exist in a state of being close. In accordance with the present invention, a catalyst that can demonstrate NOx purification performance at low temperatures and/or in an oxidative atmosphere is provided.Type: ApplicationFiled: October 22, 2010Publication date: October 25, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mayuko Osaki, Hirohito Hirata, Naoto Nagata, Yuji Matsumoto, Kei Kuramoto
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Publication number: 20120244056Abstract: A method of synthesizing metal composite oxide, the method including: a step of separately introducing into a high-speed stirring apparatus a ceria composite oxide microparticle colloid having a mean particle diameter of 10 nm or less after adding a dispersant and an alumina microparticle colloid having a mean particle diameter of 10 nm or less after adding a dispersant; a step of synthesizing alumina-ceria composite oxide microparticles by allowing the ceria composite oxide microparticles and the alumina microparticles that have been introduced into the high-speed stirring apparatus to react in a microscopic space; and a step of applying a shearing force of 17000 sec?1 or more to the alumina-ceria composite oxide microparticles.Type: ApplicationFiled: December 6, 2010Publication date: September 27, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Satoshi Nagao, Kimiyasu Ono, Hirohito Hirata, Akihiko Suda, Kimitoshi Sato, Kae Yamamura, Akira Morikiawa
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Patent number: 8236094Abstract: The present invention provides an exhaust gas purifying device including an electrically insulated hollow cylindrical case, a cylindrical outer circumferential electrode arranged on an inner wall of the hollow cylindrical case, a bar-shaped center electrode held on a center axis of the outer circumferential electrode, and a metallic hollow cylindrical body arranged between the outer circumferential electrode and the center electrode, wherein the metallic hollow cylindrical body is electrically insulated and has a plurality of holes to permit particulate matter to pass therethrough without being accumulated.Type: GrantFiled: March 27, 2008Date of Patent: August 7, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Masaru Kakinohana, Hirohito Hirata, Akira Mizuno