Patents by Inventor Nobue Teshima
Nobue Teshima 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: 5166122Abstract: A process for producing a denitration catalyst suitable for catalytically reducing nitrogen oxides in exhaust gases having a low dust content with ammonia is provided, which process comprises adding water to catalyst raw materials affording titanium oxide, molybdenum oxide and vanadium oxide at the time of calcination respective proportions thereof being in the range of Ti/Mo/V=97-65/3-20/0-15 atomic %, to make slurry, followed by coating the slurry onto a metal substrate and drying. Molybdenum oxide particles are coated on a titanium oxide particle at calcination, which makes the grindability of the catalyst particle easy and improve its adherence to the metal substrate.Type: GrantFiled: November 21, 1990Date of Patent: November 24, 1992Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Nobue Teshima, Yasuyoshi Kato, Takashi Michimoto
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Patent number: 5151256Abstract: A coal combustion apparatus having prevented deterioration of a denitration catalyst due to volatile metal compounds contained in exhaust gases is provided, which apparatus comprises a combustion furnace, a denitration means for removing nitrogen oxides in an exhaust gas from the furnace by reducing nitrogen oxide with ammonia, a means for collecting ashes in the gas having left the denitration means and a means for recycling the collected ashes into the furnace, and is characterized in providing an oxygen concentration meter in the flow path of the gas between the furnace and the denitration means and also providing an oxygen concentration-controlling means relative to air fed inside the flow path of the gas from the furnace to the denitration means so as to control the oxygen concentration detected by the oxygen concentration meter to a definite value or higher.Type: GrantFiled: May 2, 1991Date of Patent: September 29, 1992Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Kunihiko Konishi, Nobue Teshima, Toshiaki Matsuda, Hiroshi Akama
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Patent number: 5087600Abstract: A catalyst for denitration by catalytic reduction using ammonia capable of preventing catalyst deterioation due to vapors of heavy metal compounds contained in exhaust gases and having a high strength and a superior resistance to poisons and a process for producing the catalyst are provided, which catalyst comprises TiO.sub.2, oxide(s) of at least one of V, Cu, Fe and Mn and oxide(s) of at least one of Mo, W and Sn, the total of the mol number(s) of the oxide(s) of at least one of Mo, W and Sn falling within a range of 2.times.10.sup.-6 to 20.times.10.sup.-6 mol/m.sup.2 per the unit specific surface of the catalyst, and which process comprises having oxide(s) of at least one of Mo, W and Sn adsorbed and supported onto a composition comprising TiO.sub.2 prepared in advance and oxide(s) of at least one of V, Fe, Cu and Mn so as to give the above-specified total of the mol number(s) of oxide(s) of at least one of Mo, W and Sn.Type: GrantFiled: September 27, 1990Date of Patent: February 11, 1992Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Kunihiko Konishi, Hiroshi Akama, Toshiaki Matsuda, Nobue Teshima
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Patent number: 5047378Abstract: An exhaust gas-purifying catalyst capable of carrying out the CO-oxidizing reaction and the reduction reaction of NO.sub.x with NH.sub.3 in the same reactor and with good efficiency, and a process for purifying exhaust gases using the catalyst are provided, which catalyst comprises Cu and/or Co supported by Zr oxide or Ti oxide mixed with a Cu-substituted type zeolite.Type: GrantFiled: October 17, 1989Date of Patent: September 10, 1991Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Nobue Teshima, Kunihiko Konishi, Toshiaki Matsuda
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Patent number: 4977128Abstract: A high performance catalyst for combustion is provided which includes a heat-resistant carrier capable of retaining a high specific surface area even when it is used at a high temperature of 1,000.degree. C. or higher for a long time, and processes for producing and using the same are provided, which catalyst comprises a compound expressed by a composition formula of BaAl.sub.12 O.sub.19, and the process for producing the catalyst comprises kneading .gamma.-alumina or aluminum hydroxide and a barium compound or impregnating the former compound with the latter so as to give an atomic ratio of Al/Ba in the range of 100/1 to 100/15, followed by calcination. The process of using the catalyst comprises contacting a volatile organic material under combustion conditions with a catalytic amount of BaAl.sub.12 O.sub.19 and producing combustion products.Type: GrantFiled: December 29, 1987Date of Patent: December 11, 1990Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Nobue Teshima, Masao Ohta, Kunihiko Konishi
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Patent number: 4966882Abstract: A catalyst for denitration by catalytic reduction using ammonia capable of preventing catalyst deterioation due to vapors of heavy metal compounds contained in exhaust gases and having a high strength and a superior resistance to poisons and a process for producing the catalyst are provided, which catalyst comprises TiO.sub.2, oxide(s) of at least one of V, Cu, Fe and Mn and oxide(s) of at least one of Mo, W and Sn, the total of the mol number(s) of the oxide(s) of at least one of Mo, W and Sn falling within a range of 2.times.10.sup.-6 to 20.times.10.sup.-6 mol/m.sup.2 per the unit specific surface of the catalyst, and which process comprises having oxide(s) of at least one of Mo, W and Sn absorbed and supported onto a composition comprising TiO.sub.2 prepared in advance and oxide(s) of at least one of V, Fe, Cu and Mn so as to give the above-specified total of the mol number(s) of oxide(s) of at least one of Mo, W and Sn.Type: GrantFiled: June 2, 1988Date of Patent: October 30, 1990Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Kunihiko Konishi, Hiroshi Akama, Toshiaki Matsuda, Nobue Teshima
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Patent number: 4952548Abstract: A catalyst for removing nitrogen oxides contained in exhaust gases, particularly those containing vapor-form catalyst poisons, by catalytic reduction with ammonia, while retaining a high denitration performance for a long time, which catalyst comprises titanium oxide as a first component, molybdenum oxide and/or tungsten oxide as a second component and vanadium oxide and/or sulfate as a third component, the atomic ratio of the respective elements being Ti:Mo and/or W:V=80-96.6:3-15:0.5-5, and the size of the crystallite of the titanium oxide according to Sherrer's equation being in the range of 185 .ANG. to 300 .ANG. in the direction of a plane (101) (interplanar spacing: d=3.52 .ANG.).Type: GrantFiled: October 18, 1988Date of Patent: August 28, 1990Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Kunihiko Konishi, Hiroshi Akama, Toshiaki Matsuda, Nobue Teshima, Fumito Nakajima, Tadaaki Mizoguchi, Masahiro Nitta
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Patent number: 4798813Abstract: A catalyst for removing nitrogen oxides whose activity deterioration due to volatile poisons contained in exhaust gases is prevented and which has a superior endurance, and a process for producing the catalyst are provided, which catalyst comprises a titania having a surface area of 20 m.sup.2 /g or less and a zeolite having 0.01 to 20% by weight of copper supported thereon; having an average pore diameter of 10 .ANG. or less; and having a silica/alumina molar ratio of 10 or more, and which process comprises mixing powder of the zeolite with the titania or its precursor, followed by molding the mixture into a predetermined shape, followed by calcining the resulting material at 800.degree. C. or higher.Type: GrantFiled: July 2, 1987Date of Patent: January 17, 1989Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Kunihiko Konishi, Toshiaki Matsuda, Meiji Ito, Taiji Kamiguchi, Nobue Teshima, Hiroshi Akama
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Patent number: 4711872Abstract: A high performance catalyst for combustion having a cheap and heat-resistant carrier capable of retaining a high specific surface area even when it is used at a high temperature of 1,000.degree. C. or higher for a long time, and a process for producing the same are provided, which catalyst comprising a compound expressed by a composition formula of BaAl.sub.12 O.sub.19, and said process comprises kneading .gamma.-alumina or aluminum hydroxide and a barium compound or impregnating the former compound with the latter so as to give an atomic ratio of Al/Ba in the range of 100/1 to 100/15, followed by calcination.Type: GrantFiled: April 24, 1986Date of Patent: December 8, 1987Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Nobue Teshima, Masao Ohta, Kunihiko Konishi