Mitsubishi Heavy Industries Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Cormetech, Inc.

Mitsubishi Petrochemical Company Limited

Research Association for Utilization of Light Oil

Other

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Sakai Chemical Industry Co., Ltd.

Catalysts & Chemicals Industries Co., Ltd.

Akita University

Mitsubishi Jukogyo K.k.

Mitsubishi Petrochemical Engineering Co., Ltd.

Catalysts & Chemical Co., Ltd.

Itsubishi Heavy Industries, Ltd.

Kozo Iida

Yoshiaki Obayashi

Shigeru Nojima

Shintaro Honjo

Norihisa Kobayashi

Masashi Kiyosawa

Atsushi Morii

Susumu Okino

Shigeaki Mitsuoka

Yasuhiro Takeuchi

Osamu Naito

Toru Takashina

Chris E Difrancesco

Masanori Demoto

Touru Seto

Naruo Yokoyama

Katsumi Nochi

Makoto Imanari

Toshio Koyanagi

Morio Fukuda

Satoru Serizawa

Masayuki Hanada

Tetsuya Imai

Takeo Koshikawa

Akihiro Yamauchi

Kiyoshi Nagano

Kenichi Okada

Toshiyuki Onishi

Yukio Shibata

Shigeo Baba

Yoshihiro Minato

Kazuo Kousaka

Tsuguo Kimura

Hideo Takaoka

Takahiro Kawamura

Kazuto Kobayashi

Hitoshi Nakamura

Hajime Nagano

Yoshiaki Danno

Naohiko Ukawa

Naoyuki Kamiyama

Tadao Nakatsuji

Kazuo Ishida

Hiromitsu Shimizu

Kazuhiko Nagano

Kazuo Koga

Yasuharu Suda

Makoto Susaki

Masahiro Harada

Takashi Dogahara

Toru Seto

Toshikatsu Umaba

Toshikuni Sera

Hiroshi Suzumura

Daisuke Sanbayashi

Akira Hattori

Kazuko Takeshita

Hiroaki Rikimaru

Tsumoru Nakamura

Toyoshi Ohto

Susumu Kouno

Tsuyoshi Ohishi

Kazuo Ideue

Kazuya Mishina

Masanori Tabata

Hiromu Takatsuka

Serizawa Satoru

Mitsunori Ooizumi

Tsuneo Nagano

Masaki Miyazawa

Kenji Suzuki

Horiaki Rikimaru

Katsuyasu Sugawara

Yuuki Mochizuki

Akira Johana

A separation and recovery method that enables titanium and tungsten to be separated and recovered from a used DeNOx catalyst in high yield. Specifically, a method of separating and recovering metal elements that includes a first heating step of heating a DeNOx catalyst containing titanium, tungsten, vanadium and iron in a chlorine atmosphere, thereby removing the vanadium and the iron from the DeNOx catalyst, and a second heating step, performed after the first heating step, of heating the DeNOx catalyst in a chlorine atmosphere while the catalyst is exposed to a gas of a hydrocarbon compound (excluding CH) or an oxygen-containing carbon compound, thereby volatilizing the tungsten and the titanium from the DeNOx catalyst, and recovering the tungsten and the titanium from the DeNOx catalyst.

Method of separating and recovering metal elements

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

The present invention provides a method for removing mercury in exhaust gas, in which mercury in exhaust gas discharged from combustion equipment is removed, characterized by including a mercury oxidation process in which mercury in the exhaust gas is converted to mercury chloride in the presence of a catalyst; a contact process in which the exhaust gas is brought into contact with an absorbing solution in a scrubber to absorb and remove mercury components from the exhaust gas; and a control process in which blowing of air or addition of an oxidizing agent into the scrubber is accomplished, and the amount of blown air or the added amount of oxidizing agent is regulated to control the oxidation-reduction potential of the absorbing agent, and a system for removing mercury in exhaust gas. According to the mercury removing method in accordance with the present invention, a phenomenon that mercury chloride is reduced into metallic mercury by SOetc. and the metallic mercury scatters in the exhaust gas can be prevented, and mercury in the exhaust gas can be decreased effectively.

Method for removing mercury in exhaust gas and system therefor

The present invention provides compositions, systems, and methods for achieving high efficiencies of nitrogen oxide (NOx) removal from exhaust gases while minimizing ammonia slip and sulfur dioxide oxidation. In one embodiment, a method of removing nitrogen oxides from an exhaust gas comprises providing a first catalyst layer, adding an ammonia-containing compound to the exhaust gas upstream of the first catalyst layer in excess of the stoichiometric equivalent of the nitrogen oxides in the exhaust gas, flowing the exhaust gas through the first catalyst layer, selectively catalytically decomposing ammonia in excess of the stoichiometric reaction equivalent of the nitrogen oxides in the exhaust gas, and catalytically reducing the nitrogen oxides by reaction with ammonia not selectively catalytically decomposed.

Compositions and methods for treating exhaust gases

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

A COS treatment apparatus for a gasified gas includes an Oremoval catalyst and a COS conversion catalyst located on the downstream side of a gasified gas flow with respect to the Oremoval catalyst. Also, a COS treatment apparatus includes a TiOcatalyst that carries CrOor NiO. Further, a COS treatment method includes a first step in which Ois removed by the reaction with HS and CO, and a second step in which COS is converted to HS.

Apparatus for treating COS for gas produced by gasification and method for treating COS

The present invention provides a system for removing mercury in exhaust gas, in which mercury is removed from exhaust gas of a boiler, characterized in that between a denitrification apparatus and a wet type desulfurization apparatus, an NHdecomposition catalyst and a mercury oxidation catalyst are provided, and mercury having been oxidized into mercury chloride is removed by the wet type desulfurization apparatus. Also, it provides a method for removing mercury in exhaust gas, characterized in that the mercury removing method includes an NHdecomposition process and a mercury oxidation process, which are provided between the denitrification process and a wet desulfurization process, and mercury having been oxidized into mercury chloride is removed in the wet desulfurization process.

Method for removing mercury in exhaust gas

A discharge gas treatment apparatus and method which lower treatment cost and which attain efficient removal of mercury contained in a discharge gas are provided. The discharge gas treatment apparatus, includes a cooling apparatus for controlling the temperature of the discharge gas to a predetermined temperature in accordance with the hydrogen chloride concentration of the discharge gas; an NOremoval catalyst unit for reducing nitrogen oxide contained in the discharge gas and for causing reaction between mercury and hydrogen chloride contained in the discharge gas, the discharge gas having been controlled to the predetermined temperature and having been introduced to the apparatus, with ammonia being added thereto; and a wet-format desulfurization apparatus, disposed on the downstream side with respect to the NOremoval catalyst unit, for removing sulfur oxide and mercury chloride contained in the discharge gas through dissolving sulfur oxide and mercury chloride in a liquid absorbent.

Apparatus and method for treating discharge gas

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.

A high temperature denitration catalyst of a gas turbine single plant contains TiO, at least one of WOand MoOand VOof 0.5 wt % or less, preferably 0.2 wt % or less, or none of VO, and is optimized to be used in a temperature range up to a maximum 450 to 600&#xb0; C. The used high temperature denitration catalyst is immersed into a V-containing water solution and dried and/or burned. An intermediate temperature denitration catalyst is produced containing a VOcomponent of 0.5 wt % or more, preferably 1.0 wt % or more, and is optimized for use in a temperature range of 250 to 450&#xb0; C. This intermediate temperature denitration catalyst is re-used in a combined cycle plant after being modified or in other plants.

Gas turbine single plant modifying method, a catalyst re-using method and a re-produced catalyst

Provided are a flue gas denitration catalyst having high denitration activity and capable of suppressing a side reaction, that is, oxidation of SO; and a preparation process of the catalyst. The flue gas denitration catalyst comprises TiO, WOand VO. In the surface layer of the catalyst within 200 &#x3bc;m from the surface thereof, VOis supported on a carrier containing TiOand WO. The supported amounts of VOrange from 0.4 to 5 wt. % based on the weight of the surface layer and range from 0.1 to 0.9 wt. % based on the total weight of the catalyst. The VOthus supported has a crystallite size of less than 10 nm as measured by X-ray diffraction. The catalyst can be available by preparing a mixture containing TiOand WOand having VOsupported on the surface of an extruded product of the prepared mixture by a vapor phase method. The catalyst can be also available by having VOsupported on a powder of the prepared mixture by a vapor phase method and having the resulting powder supported on the surface of a formed product.

Flue gas denitration catalyst and preparation process thereof

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Hiroshima, Japan

Kozo Iida