Mitsubishi Heavy Industries Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Petrochemical Company Limited

Sakai Chemical Industry Co., Ltd.

Catalysts & Chemicals Industries Co., Ltd.

Cormetech, Inc.

Mitsubishi Petrochemical Engineering Co., Ltd.

Itsubishi Heavy Industries, Ltd.

Mitsubishi Hitachi Power Systems, Ltd.

Yoshiaki Obayashi

Kozo Iida

Katsumi Nochi

Shigeru Nojima

Masashi Kiyosawa

Masanori Demoto

Toshio Koyanagi

Hitoshi Nakamura

Masanao Yonemura

Osamu Naito

Shigeaki Mitsuoka

Atsushi Morii

Norihisa Kobayashi

Kouzo Iida

Satoru Serizawa

Akira Hattori

Shintaro Honjo

Touru Seto

Toshiyuki Onishi

Makoto Imanari

Tadao Nakatsuji

Hiromitsu Shimizu

Kazuhiko Nagano

Chris E Difrancesco

Toshikatsu Umaba

Toru Seto

Toshikuni Sera

Morio Fukuda

Naruo Yokoyama

Masayuki Hanada

Hiroshi Suzumura

Kiyoshi Nagano

Takeo Koshikawa

Akihiro Yamauchi

Kazuo Ideue

Kazuya Mishina

Kouza Iida

Mitsunori Ooizumi

Tsuneo Nagano

Horiaki Rikimaru

An object of the present invention is to provide a catalyst for treating exhaust gas adapted not only to remove CO and VOCs based on unsaturated hydrocarbons such as CHbut also to accelerate a decomposition reaction of saturated hydrocarbons such as propane and to provide a method for producing such a catalyst for treating exhaust gas. The present invention provides a catalyst for treating an exhaust gas containing carbon monoxide and volatile organic compounds, the catalyst comprising a substrate containing a NOx removal catalyst component and a porous inorganic compound layer containing a noble metal, the layer being applied to the substrate.

Catalyst for treating exhaust gas and method for producing the same

An exhaust gas treatment catalyst for removal of one or more pollutants in an exhaust gas, the catalyst comprising: a SO-reducing catalyst powder which removes the above-described pollutants; and a diluent powder which is not the SO-reducing catalyst powder nor a catalyst for reactions between exhaust gas components and a reagent, wherein the SO-reducing catalyst powder is dispersed in the diluent powder.

Exhaust gas treatment catalyst, exhaust gas treatment method, and exhaust gas treatment apparatus

The present invention is to provide a catalyst for removing nitrogen oxides which is capable of keeping sufficient denitrification performance, i.e., a high removal rate of nitrogen oxides in exhaust gas having a high NOcontent especially under conditions where the ratio of NO/NO in exhaust gas is 1 or higher, a catalyst molded product therefor, and an exhaust gas treating method. The catalyst is designed for removing nitrogen oxides, which is used to denitrify exhaust gas containing nitrogen oxides having a high NOcontent, which comprises: at least one kind of oxide selected from the group consisting of copper oxides, chromium oxides, and iron oxides as a component for reducing NOto NO; and which further comprises: at least one kind of titanium oxide; at least one kind of tungsten oxide; and at least one kind of vanadium oxide as components for reducing NO to N.

Catalyst for removing nitrogen oxides

A regenerated exhaust gas treatment catalyst () can be produced by coarsely grinding a used exhaust gas treatment catalyst (); separating a coarsely ground material into coarse pieces () and a fine powder (); finely grinding the coarse pieces (); kneading the fine powder together with other raw materials, molding a kneaded material, and drying and burning a molded material to produce a base material (); grinding a fresh exhaust gas treatment catalyst (); forming a slurry solution of the ground product of the fresh exhaust gas treatment catalyst (); coating the surface of the base material () with the slurry solution (); and drying the base material () that has been coated with the slurry solution () and burning the base material () at a temperature higher than the burning temperature employed in the production of the exhaust gas treatment catalyst ().

Method for regeneration of exhaust gas treatment catalyst, and exhaust gas treatment cataylst produced using the method

Provided is a method of regenerating an exhaust gas treatment catalysthaving ash adhered to a surface thereof. The method includes a crushing step Sin which the exhaust gas treatment catalystis crushed such that 70 to 95 wt % of the whole exhaust gas treatment catalystbecomes coarse pieceshaving a size exceeding a threshold size S (any value in a range of 0.105 to 1.0 mm); a separating step Sin which the fragments obtained by crushing the exhaust gas treatment catalystare separated into the coarse pieceshaving a size exceeding threshold size S and fine particleshaving a size not larger than the threshold size S; a pulverizing step Sin which the coarse piecesthus separated are pulverized to a fine powder having an average particle diameter of not larger than 0.1 mm; a kneading step Sand a molding step Sin which the fine powder is kneaded with other raw materials and molded into an exhaust gas treatment catalyst; and a drying step Sand a calcining step Sin which the molded precursor is dried and calcined to thus obtain a regenerated exhaust gas treatment catalyst

Method of regenerating exhaust gas treatment catalyst and exhaust gas treatment catalyst obtained by the method

A catalyst for treating exhaust gases containing nitrogen monoxide, carbon monoxide and volatile organic compounds includes a plurality of layers, an upper layer of which has an active component contained uniformly therein and a lower layer of which has no active component contained therein. The catalyst is obtained through the steps of: forming the lower layer by coating the surface of substrate with a slurry of a porous inorganic compound, followed by drying; and forming the upper layer, which is to be the top surface of the catalyst, by coating the surface of the lower layer with a slurry of a porous inorganic compound that has the active component composed of one or more precious metals supported thereon, followed by drying. The oxidation power of the resulting catalyst is enhanced without increasing the amount of precious metal supported thereon.

Catalyst for treating exhaust gases, method for producing the same, and method for treating exhaust gases

It is intended to provide an exhaust gas treatment system, which allows for VOC removal at lower temperatures and thereby improves the durability of catalysts and suppresses carbon monoxide generation at the final outlet of the system. The present invention provides a treatment system of an exhaust gas containing a nitrogen oxide, carbon monoxide, and a volatile organic compound comprising: an exhaust gas treatment means for removing the nitrogen oxide by reduction with ammonia and partially oxidizing the VOC to CO; and a CO/VOC removal means for oxidizing the CO and partially unreacted VOC, in this order from the upstream flow of the exhaust gas.

Exhaust gas treatment system

In an exhaust gas treatment, the amount of a highly corrosive mercury-halogenating agent to be added is reduced with the mercury-removing efficiency maintained high. A mercury-halogenating agent () and ammonia () are added to combustion exhaust gas from a boiler, the exhaust gas containing NO, SOand mercury. The exhaust gas is brought into contact with a CO/HC oxidation catalyst () and is then subjected to reduction denitration () in the presence of a solid catalyst. Thereafter, metallic mercury is oxidized to halogenated mercury. Then, the exhaust gas is wet-desulfurized () with the alkaline absorbing solution, and the halogenated mercury is removed.

Method and apparatus for treating exhaust gas

Provided is a catalyst for treating exhaust gas capable of reducing the amount of a highly corrosive mercury-chlorinating agent to be added while keeping the mercury oxidation efficiency high in an exhaust gas treatment. By the catalyst for treating exhaust gas, nitrogen oxide in the exhaust gas is removed upon contact with ammonia serving as a reducing agent, and mercury is oxidized using a halogen serving as an oxidant. The catalyst includes: TiOas a support; an oxide of at least one selected from the group consisting of V, W and Mo, which is supported as an active component on the support; and at least one selected from the group consisting of Bi, P, and compounds containing Bi and/or P, which is supported as a co-catalyst component on the support.

Catalyst for treating exhaust gas

To provide a catalyst for treating exhaust gases containing nitrogen monoxide, carbon monoxide and volatile organic compounds whose oxidation power has been enhanced without increasing the amount of precious metal supported thereon; a method for producing the same; and a method for treating exhaust gases. A catalyst for treating exhaust gases, including coat layers made up of a plurality of layers, an upper layer of which has an active component contained uniformly therein and a lower layer of which has no active component contained therein, can be obtained through the steps of: forming the lower layer by coating the surface of substrate with a slurry of a porous inorganic compound, followed by drying; and forming the upper layer, which is to be the top surface of the catalyst, by coating the surface of the lower layer with a slurry of a porous inorganic compound that has the active component composed of one or more precious metals supported thereon, followed by drying.

Provided are an exhaust gas treatment catalyst capable of reducing ammonia leakage rate while keeping a sufficient NOremoval efficiency, said catalyst comprising a coating layer and a catalyst base material, wherein said coating layer has a decreased thickness relative to that of a catalyst base material; and an exhaust gas treatment system using the same. In the exhaust gas treatment catalyst for catalytically removing nitrogen oxides from an exhaust gas by using ammonia as a reducing agent and simultaneously decomposing and removing unreacted ammonia, a coating layer comprising platinum supported on titania is formed on a surface of a porous catalyst base material comprising titania and at least one compound selected from oxides of vanadium (V), oxides of tungsten (W) and oxides of molybdenum (Mo).

Exhaust gas treatment catalyst and exhaust gas treatment system

An air pollution control apparatus according to the present invention reduces nitrogen oxides and oxidizes mercury in flue gasdischarged from a boiler by an ammonia denitrating catalyst. The air pollution control apparatus includes an economizer bypassing unitthat diverts high-temperature combustion gasto a downstream side while bypassing an economizerprovided in a gas fluefor combustion gasfrom the boiler, provided with an ammonium-chloride supply unitthat supplies powdery ammonium chloride (NHCl) to the economizer bypassing unit. The air pollution control apparatus sublimates the ammonium chloride in an atmosphere at a high temperature of the combustion gas, and supplies hydrogen chloride and ammonium into the flue gas flue

Air pollution control apparatus and air pollution control method

The invention provides a discharge gas treatment catalyst which can effectively decreases NOand SOcontained in a discharge gas. The discharge gas treatment catalyst, for removing nitrogen oxide and sulfur trioxide from a discharge gas, includes a carrier which is formed of titania-tungsten oxide and which carries ruthenium, and a titania-tungsten oxide-based NOremoval catalyst serving as a substrate which is coated with the carrier. When a discharge gas to which ammonia has been added and which contains SOand NOis brought into contact with the catalyst, decomposition of ammonia is suppressed by ruthenium, and reduction of SOand NOcontained in the discharge gas is promoted, whereby SOconcentration and NOconcentration can be further decreased.

Discharge gas treatment catalyst

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Hiroshima, Japan

Yoshiaki Obayashi