Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Heavy Industries Engineering, Ltd.

Akita University

Cormetech, Inc.

Mitsubishi Power, Ltd.

Katsumi Nochi

Masashi Kiyosawa

Masanao Yonemura

Yoshiaki Obayashi

Hitoshi Nakamura

Masanori Demoto

Toshio Koyanagi

Shintaro Honjo

Toshinobu Yasutake

Toshihiro Sato

Nobuyuki Ukai

Kozo Iida

Moritoshi Murakami

Tomotsugu Masuda

Hideo Miyanishi

Rikuma Shijo

Nobuyasu Sakata

Norihisa Kobayashi

Shigeru Nojima

Kaori Yoshida

Chris E Difrancesco

Akira Hattori

Akihiro Sawata

Kazuhiro Iwamoto

Shuji Fujii

Satoru Shishido

Yoshiharu Watanabe

Koji Higashino

Hiroshi Kako

Toshiyuki Onishi

Yuuki Mochizuki

Katsuyasu Sugawara

Kyohei Takakura

Yu Urabe

Takuma Kurai

Takafumi Kubota

It is an object to provide a regenerated denitration catalyst whose denitration performance is restored compared with a denitration catalyst before use, utilizing a spent denitration catalyst, and a method for manufacturing the same. In a regenerated denitration catalyst according to the present disclosure, a spent denitration catalyst including a first titanium oxide as a main component, and a second titanium oxide are mixed. The spent denitration catalyst is already used in a denitration reaction in which nitrogen oxides in a gas are decomposed into nitrogen and water using a reducing agent. The second titanium oxide has a larger specific surface area per unit weight than the first titanium oxide. A content of the second titanium oxide based on a total weight of the first titanium oxide and the second titanium oxide is preferably 10% by weight or more and 90% by weight or less.

Regenerated denitration catalyst and method for manufacturing the same, and denitration apparatus

Provided are a denitration catalyst regeneration method and a denitration catalyst regeneration system, which are capable of recovering denitration performance to a high level and reducing the SOoxidation rate of a catalyst. A denitration catalyst regeneration method according to the present invention includes: a chemical solution cleaning step for immersing a denitration catalyst in a chemical solution containing a fluorine compound and an inorganic acid; a step for extracting the denitration catalyst from the chemical solution; and a finish washing step for washing the denitration catalyst extracted from the chemical solution with a finish cleaning solution containing an organic acid.

Denitration catalyst regeneration method and denitration catalyst regeneration system

A catalyst for COS hydrolysis includes titanium dioxide and a barium compound supported on the titanium dioxide. The catalyst, when expressing Ba and S in the catalyst in terms of BaO and SO, respectively, has a molar ratio of SOto BaO of at least 1. The catalyst converts COS and HO in a raw material gas to COand HS.

Catalyst for hydrolysis of carbonyl sulfide and method of producing same

Provided is a catalyst for removing NOx from a combustion exhaust gas, in particular, a low-NOx combustion exhaust gas, wherein the catalyst has a ratio of a pore volume in a range of not less than 500 &#x212b; and not more than 3000 &#x212b; in a pore diameter relative to a total pore volume of not less than 15% and not more than 40% and preferably a ratio of a pore volume in a range of not less than 1000 &#x212b; in the pore diameter relative to the total pore volume of not less than 10% and not more than 45% in a pore volume distribution in a range of not more than 10&#x212b; in the pore diameter, and where SILICA is unlikely to be deposited and even when the amount of SILICA deposited is increased, denitration performance is hardly lowered.

Catalyst and method for removing NOX from combustion exhaust gas

Provided is a denitration catalyst with an improved wear resistance capable of stably reducing and removing nitrogen oxides in flue gases for a long period of time and a production method therefor. A denitration catalyst obtained by having a honey comb molded body that contains at least titanium oxide and vanadium pentoxide support magnesium surface, and wherein the peak intensity ratio of the first peak of the magnesium sulfate to the first peak of the titanium oxide in X-ray diffraction is 0.05-0.15, the content of the magnesium sulfate increases by 6-22% by mass, the pore volume is 0.17-0.40 cc/g, and the specific surface area is 33-100 m/g.

Denitration catalyst and method for producing same

Provided is a method for producing a NOx removal catalyst for high-temperature exhaust gas, comprising: calcining a mixture comprising ZrOand TiOwith a ZrOcontent ratio of 15% by weight to 55% by weight at 500&#xb1;15&#xb0; C. to obtain a composite oxide support; and supporting tungsten oxide on the composite oxide support, followed by calcination at 650&#xb1;15&#xb0; C. to obtain a powder catalyst.

Method for producing NOx removal catalyst for high-temperature exhaust gas

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

Provided are an exhaust gas treatment catalyst for denitrifying an exhaust gas including sulfur oxides and vanadium discharged from a heavy oil combustion boiler, including: a support comprising any one or all of titanium oxide and silica wherein a content of silica is from 10% to 20%, and an active component supported in the support and comprising one selected from the group consisting of vanadium and tungsten.

Exhaust gas treatment catalyst

A NOx removal catalyst for high-temperature flue gas according to the present invention is a NOx removal catalyst for high-temperature flue gas that contains nitrogen oxide in which tungsten oxide with the number of molecular layers of tungsten oxide (WO) being five or less is supported on a complex oxide carrier containing titanium oxide. Even when high-temperature denitration is continued, a bonding force with a carrier of WOcan be properly maintained and volatilization can be suppressed while maintaining a high NOx removal performance. For example, the NOx removal catalyst is particularly suitable for reducing and removing nitrogen oxide contained in high-temperature gas discharged from a thermal power plant and a high-temperature boiler.

NOx removal catalyst for high-temperature flue gas, manufacturing method thereof, and NOx removal method for high-temperature flue gas

In a NOremoval catalyst used for removing nitrogen oxides in flue gas, when a silica (Si) component as an inhibitor that causes an increase in a SOoxidation rate accumulates on a surface of the catalyst, the silica component accumulating on the surface of the catalyst is dissolved, thereby regenerating the catalyst. Accordingly, the inhibitor such as the silica component covering the surface of the NOremoval catalyst can be removed, thereby enabling to provide a catalyst without having an increase in the SOoxidation rate of the regenerated NOremoval catalyst.

[object Object]

Provided is an exhaust gas treatment catalyst including: a de-NOx catalyst; and a coating layer being provided on a surface of the de-NOx catalyst and containing at least one selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates. In a method for regenerating an exhaust gas treatment catalyst of the present invention, the coating layer of the de-NOx catalyst on which VOSOis deposited is removed with an acid, and after the removal of the coating layer, a coating layer containing at least one selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates is again provided.

Method for regenerating exhaust gas treatment catalyst

The method includes a pretreatment step during an operation of a boiler in which in a predetermined period of time before shutdown of the boiler, a part of combustion gas that has bypassed an economizer provided in a flue gas duct for flue gas from the boiler is supplied to an upstream of a NOremoval device having a NOremoval catalyst and mixed with the combustion flue gas from the economizer to generate mixed gas having a predetermined temperature equal to or higher than 360&#xb0; C. (360&#xb0; C. to 450&#xb0; C.), the mixed gas is introduced into the NOremoval catalyst, thereby decomposing VOSOadhering to and accumulating on the NOremoval catalyst into VO.

Exhaust gas treatment catalyst and method for regenerating the same

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

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

Growing community of inventors

Tokyo, Japan

Katsumi Nochi