Patents by Inventor Eiji KIYONAGA
Eiji KIYONAGA 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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Patent number: 11560819Abstract: Provided is a combustion system using a catalyst having better denitration efficiency at low temperatures, during a selective catalytic reduction reaction in which ammonia is used as a reducing agent. This combustion system comprises: a combustion device that combusts fuel; an exhaust path through which flows exhaust gas generated from the combustion of fuel in the combustion device; a dust collection device that is arranged on the exhaust path and collects ash dust/dust in the exhaust gas; and a denitration device that is arranged on the exhaust path and removes nitrogen oxides from the exhaust gas by means of a denitration catalyst, wherein the denitration device is arranged downstream of the dust collection device on the exhaust path, and the denitration catalyst contains vanadium oxide including vanadium pentoxide and has a defect site in which an oxygen atom is deficient in a crystal structure of the vanadium pentoxide.Type: GrantFiled: March 7, 2019Date of Patent: January 24, 2023Assignees: THE CHUGOKU ELECTRIC POWER CO., INC., TOKYO METROPOLITAN PUBLIC UNIVERSITY CORPORATIONInventors: Eiji Kiyonaga, Kazuhiro Yoshida, Keiichiro Morita, Toru Murayama, Masatake Haruta, Shinichi Hata, Yusuke Inomata
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Patent number: 11434803Abstract: Provided is a combustion system using a catalyst having better denitration efficiency at low temperatures, during a selective catalytic reduction reaction in which ammonia is used as a reducing agent. This combustion system comprises: a combustion device that combusts fuel; an exhaust path through which flows exhaust gas generated from the combustion of fuel in the combustion device; a dust collection device that is arranged on the exhaust path and collects soot/dust in the exhaust gas; and a denitration device that is arranged on the exhaust path and removes nitrogen oxides from the exhaust gas by means of a denitration catalyst, wherein the denitration device is arranged downstream of the dust collection device on the exhaust path, and the denitration catalyst contains vanadium oxide, has a carbon content of 0.05 wt % or more, and has a defect site in which oxygen deficiency occurs in a crystal structure.Type: GrantFiled: March 7, 2019Date of Patent: September 6, 2022Assignees: THE CHUGOKU ELECTRIC POWER CO., INC., TOKYO METROPOLITAN PUBLIC UNIVERSITY CORPORATIONInventors: Eiji Kiyonaga, Kazuhiro Yoshida, Keiichiro Morita, Toru Murayama, Masatake Haruta, Shinichi Hata, Yusuke Inomata
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Publication number: 20220176349Abstract: Provided is a catalyst with a more satisfactory denitration efficiency at low temperatures during a selective catalytic reduction reaction having ammonia as the reductant, compared to prior art techniques. This denitration catalyst contains vanadium oxide. The denitration catalyst has a carbon content of 0.05% by weight or more, and has a deficiency site wherein oxygen deficiency occurs within the crystal structure.Type: ApplicationFiled: March 7, 2019Publication date: June 9, 2022Inventors: EIJI KIYONAGA, Kazuhiro YOSHIDA, Keiichiro MORITA, Toru MURAYAMA, Masatake HARUTA, Shinichi HATA, Yusuke INOMATA
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Publication number: 20220176350Abstract: Provided is a catalyst having better denitration efficiency at low temperatures compared to the prior art, during a selective catalytic reduction reaction in which ammonia is used as a reducing agent. This denitration catalyst contains vanadium oxide including vanadium pentoxide and has a defect site in which oxygen deficiency occurs in a crystal structure of the vanadium pentoxide.Type: ApplicationFiled: March 7, 2019Publication date: June 9, 2022Inventors: Eiji KIYONAGA, Kazuhiro YOSHIDA, Keiichiro MORITA, Toru MURAYAMA, Masatake HARUTA, Shinichi HATA, Yusuke INOMATA
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Publication number: 20220168712Abstract: Provided is a catalyst which, when used in a selective catalytic reduction reaction in which ammonia serves as the reducing agent, further improves denitration efficiency at low temperatures compared to the prior art. The denitration catalyst comprises vanadium oxide as a main component, and has a content of a second metal, in teams of oxide, of 1-40 wt %. The second metal is at least one type of metal element selected from the group consisting of Co, W, Mo, Nb, Ce, Sn, Ni, Fe, Cu, Zn, and Mn.Type: ApplicationFiled: March 5, 2020Publication date: June 2, 2022Inventors: Eiji KIYONAGA, Kazuhiro YOSHIDA, Keiichiro MORITA, Toru MURAYAMA, Masatake HARUTA, Shinichi HATA, Yusuke INOMATA
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Publication number: 20220170403Abstract: Provided is a combustion system in which a catalyst having superior denitration efficiency at a low temperature compared with those used in the conventional techniques is used in a selective catalytic reduction reaction using ammonia as a reducing agent. A combustion system equipped with: a denitration device which is arranged in the exhaust passage and can remove a nitrogen oxide from the exhaust gas with a denitration catalyst. In the combustion system, the denitration device is arranged on the downstream side of the dust collection device in the exhaust passage, and the denitration catalyst is one which contains vanadium oxide as the main component and in which the content of a second metal in terms of oxide content is 1 to 40 wt % inclusive, wherein the second metal comprises at least one metal element selected from the group consisting of Co, W, Mo, Nb, Ce, Sn, Ni, Fe, Cu, Zn and Mn.Type: ApplicationFiled: March 5, 2020Publication date: June 2, 2022Inventors: Eiji KIYONAGA, Kazuhiro YOSHIDA, Keiichiro MORITA, Toru MURAYAMA, Masatake HARUTA, Shinichi HATA, Yusuke INOMATA
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Publication number: 20220170402Abstract: Provided is a combustion system using a catalyst having better denitration efficiency at low temperatures, during a selective catalytic reduction reaction in which ammonia is used as a reducing agent. This combustion system comprises: a combustion device that combusts fuel; an exhaust path through which flows exhaust gas generated from the combustion of fuel in the combustion device; a dust collection device that is arranged on the exhaust path and collects soot/dust in the exhaust gas; and a denitration device that is arranged on the exhaust path and removes nitrogen oxides from the exhaust gas by means of a denitration catalyst, wherein the denitration device is arranged downstream of the dust collection device on the exhaust path, and the denitration catalyst contains vanadium oxide, has a carbon content of 0.05 wt % or more, and has a defect site in which oxygen deficiency occurs in a crystal structure.Type: ApplicationFiled: March 7, 2019Publication date: June 2, 2022Inventors: Eiji KIYONAGA, Kazuhiro YOSHIDA, Keiichiro MORITA, Toru MURAYAMA, Masatake HARUTA, Shinichi HATA, Yusuke INOMATA
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Publication number: 20220127991Abstract: Provided is a combustion system using a catalyst having better denitration efficiency at low temperatures, during a selective catalytic reduction reaction in which ammonia is used as a reducing agent. This combustion system comprises: a combustion device that combusts fuel; an exhaust path through which flows exhaust gas generated from the combustion of fuel in the combustion device; a dust collection device that is arranged on the exhaust path and collects ash dust/dust in the exhaust gas; and a denitration device that is arranged on the exhaust path and removes nitrogen oxides from the exhaust gas by means of a denitration catalyst, wherein the denitration device is arranged downstream of the dust collection device on the exhaust path, and the denitration catalyst contains vanadium oxide including vanadium pentoxide and has a defect site in which an oxygen atom is deficient in a crystal structure of the vanadium pentoxide.Type: ApplicationFiled: March 7, 2019Publication date: April 28, 2022Inventors: Eiji KIYONAGA, Kazuhiro YOSHIDA, Keiichiro MORITA, Toru MURAYAMA, Masatake HARUTA, Shinichi HATA, Yusuke INOMATA
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Patent number: 10865684Abstract: A combustion system operated at low cost is provided. A combustion system 1 includes a combustion device 10 that burns fuel, an exhaust line L1 through which exhaust gas flows, the exhaust gas being generated through combustion of the fuel in the combustion device 10, an air preheater 30 that is disposed in the exhaust line L1 and that recovers heat from the exhaust gas, and a denitration device 40 that is disposed in the exhaust line L1 and that removes nitrogen oxide from the exhaust gas using a denitration catalyst. The denitration device 40 is disposed downstream from the air preheater 30 in the exhaust line L1, and the denitration catalyst contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more.Type: GrantFiled: March 7, 2017Date of Patent: December 15, 2020Assignees: THE CHUGOKU ELECTRIC POWER CO., INC., TOKYO METROPOLITAN UNIVERSITYInventors: Eiji Kiyonaga, Kenji Hikino, Keiichiro Morita, Masatake Haruta, Toru Murayama, Makoto Mino
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Patent number: 10767535Abstract: There is provided a method for recycling a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A method for recycling a denitration catalyst includes a step of spraying an aqueous solution with a pH of 7 or more onto a used denitration catalyst while the denitration catalyst is set in a denitration device to remove a surface of the denitration catalyst. The denitration catalyst contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more. The denitration catalyst after recycling is used for denitration at 200° C. or lower.Type: GrantFiled: March 7, 2017Date of Patent: September 8, 2020Assignees: THE CHUGOKU ELECTRIC POWER CO., INC., TOKYO METROPOLITAN UNIVERSITYInventors: Eiji Kiyonaga, Kenji Hikino, Keiichiro Morita, Toshikazu Yoshikawa, Masatake Haruta, Toru Murayama, Makoto Mino
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Patent number: 10746073Abstract: There is provided a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A denitration catalyst is obtained by coating a substrate with a catalyst component. The catalyst component contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more. The denitration catalyst is used for denitration at 200° C. or lower.Type: GrantFiled: March 7, 2017Date of Patent: August 18, 2020Assignees: THE CHUGOKU ELECTRIC POWER CO., INC., TOKYO METROPOLITAN UNIVERSITYInventors: Eiji Kiyonaga, Kenji Hikino, Keiichiro Morita, Masatake Haruta, Toru Murayama, Makoto Mino
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Patent number: 10746074Abstract: There is provided a method for recycling a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A method for recycling a denitration catalyst includes a step of removing a used denitration catalyst from a denitration device and then coating the used denitration catalyst with a catalyst component. The catalyst component contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more, and the denitration catalyst after recycling is used for denitration at 200° C. or lower.Type: GrantFiled: March 7, 2017Date of Patent: August 18, 2020Assignees: THE CHUGOKU ELECTRIC POWER CO., INC., TOKYO METROPOLITAN UNIVERSITYInventors: Eiji Kiyonaga, Kenji Hikino, Keiichiro Morita, Toshikazu Yoshikawa, Masatake Haruta, Toru Murayama, Makoto Mino
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Patent number: 10550747Abstract: A combustion system for ships operated at low cost is provided. A combustion system 1 for ships includes an internal combustion engine 20 that burns fuel, an exhaust line L2 through which exhaust gas flows, the exhaust gas being generated through combustion of the fuel in the internal combustion engine 20, an exhaust heat recovery device 40 that is disposed in the exhaust line L2 and that recovers exhaust heat from the exhaust gas discharged from the internal combustion engine 20, and a denitration device 50 that is disposed in the exhaust line L2 and that removes nitrogen oxide from the exhaust gas using a denitration catalyst. The denitration device 50 is disposed downstream from the exhaust heat recovery device 40 in the exhaust line L2. The denitration catalyst contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more.Type: GrantFiled: March 7, 2017Date of Patent: February 4, 2020Assignees: The Chugoku Electric Power Co., Inc., Tokyo Metropolitan UniversityInventors: Eiji Kiyonaga, Kenji Hikino, Keiichiro Morita, Akihiro Nakamura, Masatake Haruta, Toru Murayama, Makoto Mino
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Patent number: 10519837Abstract: A combustion system operated at low cost is provided. A combustion system 1 includes a combustion device 10 that burns fuel, an exhaust line L1 through which exhaust gas flows, the exhaust gas being generated through combustion of the fuel in the combustion device 10, a dust collector 50 that is disposed in the exhaust line L1 and that collects dust in the exhaust gas, and a denitration device 90 that is disposed in the exhaust line L1 and that removes nitrogen oxide from the exhaust gas using a denitration catalyst. The denitration device 90 is disposed downstream from the dust collector 50 in the exhaust line L1. The denitration catalyst contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more.Type: GrantFiled: March 7, 2017Date of Patent: December 31, 2019Assignees: CHUGOKU ELECTRIC POWER CO., INC., TOKYO METROPOLITAN UNIVERSITYInventors: Eiji Kiyonaga, Kenji Hikino, Keiichiro Morita, Masatake Haruta, Toru Murayama, Makoto Mino
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Patent number: 10385750Abstract: There is provided a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A denitration catalyst molded in a block shape contains 43 wt % or more of vanadium pentoxide. The denitration catalyst has a BET specific surface area of 30 m2/g or more and is used for denitration at 200° C. or lower.Type: GrantFiled: March 7, 2017Date of Patent: August 20, 2019Assignees: The Chugoku Electric Power Co., Inc., Tokyo Metropolitan UniversityInventors: Eiji Kiyonaga, Kenji Hikino, Keiichiro Morita, Masatake Haruta, Toru Murayama, Makoto Mino
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Publication number: 20190055871Abstract: A combustion system operated at low cost is provided. A combustion system 1 includes a combustion device 10 that burns fuel, an exhaust line L1 through which exhaust gas flows, the exhaust gas being generated through combustion of the fuel in the combustion device 10, a dust collector 50 that is disposed in the exhaust line L1 and that collects dust in the exhaust gas, and a denitration device 90 that is disposed in the exhaust line L1 and that removes nitrogen oxide from the exhaust gas using a denitration catalyst. The denitration device 90 is disposed downstream from the dust collector 50 in the exhaust line L1. The denitration catalyst contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more.Type: ApplicationFiled: March 7, 2017Publication date: February 21, 2019Inventors: Eiji KIYONAGA, Kenji HIKINO, Keiichiro MORITA, Masatake HARUTA, Toru MURAYAMA, Makoto MINO
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Publication number: 20190054448Abstract: There is provided a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A denitration catalyst is obtained by coating a substrate with a catalyst component. The catalyst component contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more. The denitration catalyst is used for denitration at 200° C. or lower.Type: ApplicationFiled: March 7, 2017Publication date: February 21, 2019Inventors: Eiji KIYONAGA, Kenji HIKINO, Keiichiro MORITA, Masatake HARUTA, Toru MURAYAMA, Makoto MINO
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Publication number: 20180280965Abstract: There is provided a method for recycling a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A method for recycling a denitration catalyst includes a step of spraying an aqueous solution with a pH of 7 or more onto a used denitration catalyst while the denitration catalyst is set in a denitration device to remove a surface of the denitration catalyst. The denitration catalyst contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more. The denitration catalyst after recycling is used for denitration at 200° C. or lower.Type: ApplicationFiled: March 7, 2017Publication date: October 4, 2018Inventors: Eiji KIYONAGA, Kenji HIKINO, Keiichiro MORITA, Toshikazu YOSHIKAWA, Masatake HARUTA, Toru MURAYAMA, Makoto MINO
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Publication number: 20180280941Abstract: There is provided a method for recycling a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A method for recycling a denitration catalyst includes a step of removing a used denitration catalyst from a denitration device and then coating the used denitration catalyst with a catalyst component. The catalyst component contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more, and the denitration catalyst after recycling is used for denitration at 200° C. or lower.Type: ApplicationFiled: March 7, 2017Publication date: October 4, 2018Inventors: Eiji KIYONAGA, Kenji HIKINO, Keiichiro MORITA, Toshikazu YOSHIKAWA, Masatake HARUTA, Toru MURAYAMA, Makoto MINO
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Publication number: 20180280875Abstract: A combustion system operated at low cost is provided. A combustion system 1 includes a combustion device 10 that burns fuel, an exhaust line L1 through which exhaust gas flows, the exhaust gas being generated through combustion of the fuel in the combustion device 10, an air preheater 30 that is disposed in the exhaust line L1 and that recovers heat from the exhaust gas, and a denitration device 40 that is disposed in the exhaust line L1 and that removes nitrogen oxide from the exhaust gas using a denitration catalyst. The denitration device 40 is disposed downstream from the air preheater 30 in the exhaust line L1, and the denitration catalyst contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m2/g or more.Type: ApplicationFiled: March 7, 2017Publication date: October 4, 2018Inventors: Eiji KIYONAGA, Kenji HIKINO, Keiichiro MORITA, Masatake HARUTA, Toru MURAYAMA, Makoto MINO