Hitachi, Ltd.

Babcock-hitachi Kabushiki Kaisha

Honda Motor Co., Ltd.

Babcock-hitachi Kabushiki

Hitachi Babcock Kabushiki-kaisha

Shigeru Azuhata

Hisao Yamashita

Hironobu Kobayashi

Kiyoshi Narato

Norio Arashi

Kenichi Sohma

Tadayoshi Murakami

Michio Kuroda

Tooru Inada

Shin Tamata

Shuichi Kanno

Toshio Ogawa

Osamu Kuroda

Yuichi Kitahara

Hidehiro Iizuka

Masayuki Taniguchi

Hiroshi Miyadera

Ryouta Doi

Norihiro Shinotsuka

Toshiaki Arato

Hiroshi Hanaoka

Yoji Ishibashi

Kazuyuki Ito

Kazuyoshi Irie

Toshifumi Hiratsuka

Yukio Hishinuma

Kojiro Okude

Shinzo Ikeda

Yasuo Yoshii

Hideo Kikuchi

Akira Kato

Toshio Manaka

Nobuyuki Iizuka

Nariyoshi Kobayashi

Hiroshi Kawagoshi

Keizou Ohtsuka

Yoshikazu Moritomo

Ken Yasuda

Kazuhiko Kawaike

Hiroatsu Tokuda

Yoshitaka Takahashi

Haruo Urushidani

Yoshijiro Arikawa

Akio Honji

Hidetoshi Akimoto

Tadahisa Masai

Fumio Koda

Shinichi Ichikawa

Stephen M Masutani

Yasuo Iwai

Yasuyuki Watanabe

Takeshi Atago

Yutaka Nishimura

Takao Ishikawa

Yoshishige Ohyama

Yoshio Sato

Isao Sato

Tetsuo Sasada

Hajime Toriya

Motohisa Nishihara

Kazutoshi Higashiyama

Shigeki Morita

Akira Baba

Kenichi Souma

Takeshi Yasuda

Takashi Ohmori

Kunihiro Ichikawa

Kazuhiko Kumata

Yasutaka Komatsu

Satoshi Tsukahara

Ryoichiro Oshima

Masaya Ohtsuka

Tadashi Jimbo

Noriyuki Hayashi

Hiroshi Tobita

Yoshiharu Nakayama

Kunio Hodozuka

Shinzou Ikeda

Shigekazu Nishimoto

Tugihiro Yukitake

Noriaki Matsuda

Tooru Inata

Isao Koyama

Tatsuzou Enomoto

Kenshi Kobayashi

Hiroyuki Arai

Ken-ichi Sohma

Masakiyo Tanikawa

Kei Kawano

Yoshinori Furukawa

Masao Masutani

Hiroshi Kodairajousui Hausu 205 Hanaoka

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&#xb0;&#x2013;800&#xb0; C., to convert the fluorine of the fluorine compound to hydrogen fluoride.

Process for treating fluorine compound-containing gas

Fluorine compounds such as CF, CF, CHF, SFand NF, are made in contact with a fluorine compound decomposition catalyst and a catalyst the decomposition oft least one of CO, SOFand NO in the presence of water or in the presence of water and oxygen. The catalyst the decomposition oft least one of CO, SOFand NO 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, SOFand NO, formed by decomposition of the fluorine compound can also be decomposed.

Method and apparatus for disposing of fluorine-containing compound by decomposition

Fluorine compounds such as CF, CF, CHF, SFand NF, are made to contact with a fluorine compound decomposition catalyst and a catalyst for the decomposition of at least one of CO, SOFand NO in the presence of water or in the presence of water and oxygen. The catalyst for the decomposition of at least one of CO, SOFand NO 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, SOFand NO which is formed by decomposition of the fluorine compound can also be decomposed.

Process and apparatus for the decomposition of fluorine compounds

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.

Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas of internal combustion engine

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&#xb0;-800&#xb0; C., to convert the fluorine of the fluorine compound to hydrogen fluoride.

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 NO 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.

Method for purifying exhaust gas from internal combustion engines

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.

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.

Exhaust gas cleaning apparatus and method for internal combustion engine

Exhaust gas purification apparatus of internal combustion engine and

A treating apparatus for decomposing organohalogen compounds such as chlorofluorocarbons (CFC's), trichloroethylene, methylbromide, halon, and the like, effectively, with a high activity of catalyst, is provided. The apparatus includes a reactor in which organohalogen compounds are decomposed by contact at a temperature in a range of 200.degree..about.500.degree. C. with a catalyst which comprises titania and tungsten oxide by an atomic ratio of Ti and W in a range from 20 mol % to 95 mol % Ti and from 5 mol % to 80 mol % W, with at least the surface of the titania being covered with a porous layer of the tungsten oxide. In accordance with the present invention, organic compounds containing any of fluorine, chlorine and bromine will be decomposed with a high efficiency, and the activity of the catalyst can be maintained for a long time.

Method for treating organohalogen compounds with catalyst

An exhaust gas purifying catalyst is provided for purifying NOx contained in an exhaust gas from an internal combustion engine of a vehicle operated at a high air fuel ratio due to excessive oxygen, using unburnt HC or CO in the exhaust gas as a reducing agent. The catalyst comprises platinum, strontium and a rare earth metal, as active components, each supported on a support of inorganic oxide. The active components of the catalyst include platinum of 0.01-3.7 by wt ratio, strontium of 0.01-55 by wt ratio and a rare earth metal of 0.01-36 wt ratio, per the inorganic oxide of 100 by wt ratio.

Exhaust gas purifying method and catalyst used therefor

A gas turbine combustor has a premixing burner for jetting out a premixed gas of fuel and air. A stabilizer forms a circulation of combustion gas generated by combustion of the premixed gas at the downstream side of the stabilizer to stabilize flame formed by the combustion of the premixed gas. Before the operation of the combustor, a relationship between a temperature of the stabilizer and combustion conditions of the premixed gas is checked. Thereafter during operation of the combustor, the temperature of the stabilizer is measured during combustion and the combustion conditions are checked according to only the measured temperature of the stabilizer and the aforesaid relationship. The stabilizer has a heat receiving surface at the most downstream side thereof. The temperature of a portion of the stabilizer around the heat receiving surfaces measured to allow an accurate assessment of the combustion conditions.

Stabilizer for gas turbine combustors and gas turbine combustor equipped

A light-transmissive and transparent film photocatalyst made of one of anatase-type titanium dioxide and alpha iron oxide is formed on an outside surface of a glass tube used for a fluorescent lamp. The thin film photocatalyst is formed so that electrons and holes generated inside the film by light irradiation can easily and rapidly move to the surface of the film and generate various active species at the surface of the film by contacting with the room air, enabling an excellent deodorization effect, bactericidal and fungicidal activity and contamination preventing effect.

Fluorescent lamp with a thin film photocatalyst, and method of creating

A catalyst being formed of a porous supporter supporting alkali metals, Ti and a noble metal, or further supporting at least one of rare earth metal and magnesium, being disposed in a flow passage of an internal combustion engine, and being used to purify NOx contained in the exhaust gas. The above catalyst has NOx resistance to exhaust gas burnt with a rich condition and with a lean condition and a high resistivity to poisoning by SOx.

Catalyst for purifying exhaust gas from internal combustion engine and

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Hitachi, Japan

Shigeru Azuhata