Patents by Inventor Shigeru Azuhata
Shigeru Azuhata 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: 7347980Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°–800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: GrantFiled: October 7, 2003Date of Patent: March 25, 2008Assignee: Hitachi, Ltd.Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Patent number: 7294315Abstract: Fluorine compounds such as C2F6, CF4, CHF3, SF6 and NF3, are made in contact with a fluorine compound decomposition catalyst and a catalyst the decomposition oft least one of CO, SO2F2 and N2O in the presence of water or in the presence of water and oxygen. The catalyst the decomposition oft least one of CO, SO2F2 and N2O preferably contains at least one selected from Pd, Pt, Cu, Mn, Fe, Co, Rh, Ir and Au in the form of a metal or an oxide. According to the invention, the fluorine compound can be converted to HF, which is liable to be absorbed by water or an alkaline aqueous solution, and a substance, such as CO, SO2F2 and N2O, formed by decomposition of the fluorine compound can also be decomposed.Type: GrantFiled: June 9, 1999Date of Patent: November 13, 2007Assignee: Hitachi, Ltd.Inventors: Shuichi Kanno, Akio Honji, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Publication number: 20070204595Abstract: An exhaust gas purification apparatus for use in an internal combustion engine comprises an exhaust gas duct connected to the engine through which exhaust gas containing NOx gas passes, and a catalyst disposed in the exhaust gas duct such that it contacts the exhaust gas. The catalyst chemically adsorbs NOx when a stoichiometric amount of a gaseous oxidizing agent present in the exhaust gas is larger than that of a gaseous reducing agent present in the exhaust gas for reducing NOx, adsorbed NOx is catalytically reduced in the presence of a reducing agent when the stoichiometric amount of the oxidizing agent is not larger that of the reducing agent.Type: ApplicationFiled: May 9, 2007Publication date: September 6, 2007Applicants: HITACHI, LTD., HONDA MOTOR CO., LTD.Inventors: Hiroshi HANAOKA, Osamu Kuroda, Ryouta Doi, Hidehiro Iizuka, Toshio Ogawa, Hisao Yamashita, Shigeru Azuhata, Yuichi Kitahara, Toshifumi Hiratsuka, Kojiro Okude, Norihiro Shinotsuka, Toshio Manaka
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Patent number: 7261868Abstract: Fluorine compounds such as C2F6, CF4, CHF3, SF6 and NF3, are made to contact with a fluorine compound decomposition catalyst and a catalyst for the decomposition of at least one of CO, SO2F2 and N2O in the presence of water or in the presence of water and oxygen. The catalyst for the decomposition of at least one of CO, SO2F2 and N2O preferably contains at least one selected from Pd, Pt, Cu, Mn, Fe, Co, Rh, Ir and Au in the form of a metal or an oxide. According to the invention, the fluorine compound can be converted to HF, which can be absorbed by water or an alkaline aqueous solution. Furthermore, a substance such as CO, SO2F2 and N2O which is formed by decomposition of the fluorine compound can also be decomposed.Type: GrantFiled: November 15, 2004Date of Patent: August 28, 2007Assignee: Hitachi, Ltd.Inventors: Shuichi Kanno, Akio Honji, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Patent number: 7093432Abstract: An exhaust gas purification apparatus for use in an internal combustion engine comprises an exhaust gas duct connected to the engine through which the exhaust gas containing NOx gas passes and a catalyst so disposed in the exhaust gas duct that it contacts with the exhaust gas. The catalyst chemically adsorbs NOx under the condition that a stoichiometric amount of a gaseous oxidizing agent present in the exhaust gas is larger than that of a gaseous reducing agent present in the exhaust gas for reducing NOx, while NOx being adsorbed is catalytically reduced in the presence of the reducing agent under the condition that the stoichiometric amount of the oxidizing agent is not larger that of the reducing agent. Thereby, NOx, the lean burn exhaust gas in the engine can be effectively made harmlessly.Type: GrantFiled: April 10, 2002Date of Patent: August 22, 2006Assignees: Hitachi, Ltd., Honda Motor Co., Ltd.Inventors: Hiroshi Hanaoka, Osamu Kuroda, Ryouta Doi, Hidehiro Iizuka, Toshio Ogawa, Hisao Yamashita, Shigeru Azuhata, Yuichi Kitahara, Toshifumi Hiratsuka, Kojiro Okude, Norihiro Shinotsuka, Toshio Manaka
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Publication number: 20060120938Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: ApplicationFiled: January 19, 2006Publication date: June 8, 2006Applicant: HITACHI LTD.Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Publication number: 20060093547Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200.degree.-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: ApplicationFiled: December 6, 2005Publication date: May 4, 2006Applicant: HITACHI LTD.Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Patent number: 6942841Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: GrantFiled: August 9, 2002Date of Patent: September 13, 2005Assignee: Hitachi, Ltd.Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Publication number: 20050089461Abstract: Fluorine compounds such as C2F6, CF4, CHF3, SF6 and NF3, are made in contact with a fluorine compound decomposition catalyst and a catalyst the decomposition oft least one of CO, SO2F2 and N2O in the presence of water or in the presence of water and oxygen. The catalyst the decomposition oft least one of CO, SO2F2 and N2O preferably contains at least one selected from Pd, Pt, Cu, Mn, Fe, Co, Rh, Ir and Au in the form of a metal or an oxide. According to the invention, the fluorine compound can be converted to HF, which is liable to be absorbed by water or an alkaline aqueous solution, and a substance, such as CO, SO2F2 and N2O, formed by decomposition of the fluorine compound can also be decomposed.Type: ApplicationFiled: November 15, 2004Publication date: April 28, 2005Inventors: Shuichi Kanno, Akio Honji, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Publication number: 20050089456Abstract: An exhaust gas purification apparatus for use in an internal combustion engine comprises an exhaust gas duct connected to the engine through which exhaust gas containing NOx gas passes, and a catalyst disposed in the exhaust gas duct such that it contacts the exhaust gas. The catalyst chemically adsorbs NOx when a stoichiometric amount of a gaseous oxidizing agent present in the exhaust gas is larger than that of a gaseous reducing agent present in the exhaust gas for reducing NOx, adsorbed NOx is catalytically reduced in the presence of a reducing agent when the stoichiometric amount of the oxidizing agent is not larger that of the reducing agent.Type: ApplicationFiled: July 28, 2004Publication date: April 28, 2005Applicant: HITACHI, LTD.Inventors: Hiroshi Hanaoka, Osamu Kuroda, Ryouta Doi, Hidehiro Iizuka, Toshio Ogawa, Hisao Yamashita, Shigeru Azuhata, Yuichi Kitahara, Toshifumi Hiratsuka, Kojiro Okude, Norihiro Shinotsuka, Toshio Manaka
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Patent number: 6855305Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: GrantFiled: October 3, 2003Date of Patent: February 15, 2005Assignee: Hitachi, Ltd.Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Publication number: 20040067186Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: ApplicationFiled: October 3, 2003Publication date: April 8, 2004Applicant: Hitachi, Ltd.Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Publication number: 20040067185Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: ApplicationFiled: October 2, 2003Publication date: April 8, 2004Applicant: Hitachi, Ltd.Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Publication number: 20040047784Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: ApplicationFiled: August 9, 2002Publication date: March 11, 2004Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Publication number: 20040047786Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: ApplicationFiled: October 7, 2003Publication date: March 11, 2004Inventors: Shuichi Kanno, Toshiaki Arato, Shinzo Ikeda, Ken Yasuda, Hisao Yamashita, Shigeru Azuhata, Shin Tamata, Kazuyoshi Irie
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Patent number: 6596247Abstract: A catalyst being formed of a porous supporter supporting alkali metals, Ti and noble metal, or further supporting at least one of rare earth metal and magnesium, being disposed in a flow passage of the internal combustion engine, and being used to purify NOx contained in the exaust gas. The above catalyst has excellent NOx resistance not only to the exaust gas burnt with the stoichiometric air-to-fuel ratio or rich condition, but to the exhaust gas burnt with the lean condition, and furthermore has a high resistivity to poisoning of SOx slightly contained in the fuel.Type: GrantFiled: July 7, 1999Date of Patent: July 22, 2003Assignee: Hitachi, Ltd.Inventors: Hidehiro Iizuka, Ryouta Doi, Hiroshi Hanaoka, Toshio Ogawa, Osamu Kuroda, Hisao Yamashita, Shigeru Azuhata, Yuichi Kitahara, Norihiro Shinotsuka
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Publication number: 20020159926Abstract: An exhaust gas purification apparatus for use in an internal combustion engine comprises an exhaust gas duct connected to the engine through which the exhaust gas containing NOx gas passes and a catalyst so disposed in the exhaust gas duct that it contacts with the exhaust gas. The catalyst chemically adsorbs NOx under the condition that a stoichiometric amount of a gaseous oxidizing agent present in the exhaust gas is larger than that of a gaseous reducing agent present in the exhaust gas for reducing NOx, while NOx being adsorbed is catalytically reduced in the presence of the reducing agent under the condition that the stoichiometric amount of the oxidizing agent is not larger than that of the reducing agent. Thereby, NOx, the lean burn exhaust gas in the engine can be effectively made harmlessly.Type: ApplicationFiled: April 10, 2002Publication date: October 31, 2002Applicant: Hitachi, Ltd.Inventors: Hiroshi Hanaoka, Osamu Kuroda, Ryouta Doi, Hidehiro Iizuka, Toshio Ogawa, Hisao Yamashita, Shigeru Azuhata, Yuichi Kitahara, Toshifumi Hiratsuka, Kojiro Okude, Norihiro Shinotsuka, Toshio Manaka
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Patent number: 6397582Abstract: An exhaust gas purification apparatus for use in an internal combustion engine comprises an exhaust gas duct connected to the engine through which the exhaust gas containing NOx gas passes and a catalyst so disposed in the exhaust gas duct that it contacts with the exhaust gas. The catalyst chemically adsorbs NOx under the condition that a stoichiometric amount of a gaseous oxidizing agent present in the exhaust gas is larger than that of a gaseous reducing agent present in the exhaust gas for reducing NOx, while NOx being adsorbed is catalytically reduced in the presence of the reducing agent under the condition that the stoichiometric amount of the oxidizing agent is not larger that of the reducing agent. Thereby, NOx the lean burn exhaust gas in the engine can be effectively made harmlessly.Type: GrantFiled: July 20, 2000Date of Patent: June 4, 2002Assignee: Hitachi, Ltd.Inventors: Hiroshi Hanaoka, Osamu Kuroda, Ryouta Doi, Hidehiro Iizuka, Toshio Ogawa, Hisao Yamashita, Shigeru Azuhata, Yuichi Kitahara, Toshifumi Hiratsuka, Kojiro Okude, Norihiro Shinotsuka, Toshio Manaka
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Patent number: 6272848Abstract: An apparatus and method of highly efficiently purifying nitrogen oxides are provided. An NOx chemisorption reduction catalyst chemically absorbs NOx under a condition that an exhaust gas of an internal combustion engine is an oxidizing atmosphere and deoxidizes adsorbed NOx under a reducing atmosphere. An SOx absorbent absorbs SOx contained in the exhaust gas of the oxidizing atmosphere, and deoxidizes and release SOx absorbed in the reducing atmospheric exhaust gas. The catalyst and absorbent are arranged in the exhaust path to purify the exhaust gas while preventing or suppressing SOx-poisoning of the NOx chemisorption reduction catalyst.Type: GrantFiled: July 17, 1998Date of Patent: August 14, 2001Assignee: Hitachi, Ltd.Inventors: Kojiro Okude, Hidehiro Iizuka, Osamu Kuroda, Ryouta Doi, Toshio Ogawa, Hisao Yamashita, Shigeru Azuhata, Yuichi Kitahara, Toshifumi Hiratsuka, Norihiro Shinotsuka
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Publication number: 20010001652Abstract: A gas stream containing at least one fluorine compound selected from the group consisting of compounds of carbon and fluorine, compounds of carbon, hydrogen and fluorine, compounds of sulfur and fluorine, compounds of nitrogen and fluorine and compounds of carbon, hydrogen, oxygen and fluorine is contacted with a catalyst comprising at least one of alumina, titania, zirconia and silica, preferably a catalyst comprising alumina and at least one of nickel oxide, zinc oxide and titania in the presence of steam, thereby hydrolyzing the fluorine compound at a relatively low temperature, e.g. 200°-800° C., to convert the fluorine of the fluorine compound to hydrogen fluoride.Type: ApplicationFiled: January 9, 1998Publication date: May 24, 2001Applicant: Shuichi KannoInventors: SHUICHI KANNO, TOSHIAKI ARATO, SHINZO IKEDA, TAKESHI YASUDA, HISAO YAMASHITA, SHIGERU AZUHATA, SHIN TAMATA, KAZUYOSHI IRIE