Babcock-hitachi Kabushiki Kaisha

Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Naomi Imada

Yasuyoshi Kato

Keiichiro Kai

Hiroshi Ishizaka

Eiji Miyamoto

Kazuki Kobayashi

Takeshi Hirota

Hirofumi Kikkawa

Shigehito Takamoto

Takanori Nakamoto

Takashi Michimoto

Masatoshi Fujisawa

Yoshinori Nagai

Shinpei Kaneda

Kotoe Matsuyama

Masatochi Fujisawa

Kenichi Arakawa

A catalyst for oxidation reaction of metallic mercury and reduction reaction of nitrogen oxide, comprising an oxide of titanium, an oxide of molybdenum, an oxide of vanadium, an oxide of phosphorus and gypsum is obtained by kneading titanium dioxide, ammonium molybdate, ammonium metavanadate, phosphoric acid, gypsum dihydrate and water using a kneader to obtain a paste, applying the paste to a metal lath substrate, and then drying and calcining the resultant.

Catalyst for metal mercury oxidation reactions and nitrogen oxide reduction reactions, and exhaust gas purification method

A used denitration catalyst is regenerated by means of a method comprising bringing the used denitration catalyst comprising titanium oxide as an essential ingredient into contact with a suspension of particles comprising manganese oxide, subjecting the resulting product to a liquid draining, and subjecting the liquid-drained product to a drying process, additionally, further comprising impregnating a solution comprising a compound containing at least one element selected from the group consisting of vanadium, molybdenum and tungsten into the denitration catalyst after the drying process, and subjecting the impregnated product to a drying treatment.

Method of regenerating used denitration catalyst

Provided is a catalyst structure which prevents an increase in pressure loss by a simple construction while the gas flow is efficiently stirred by a structure making contact between adjacent catalyst elements. The catalyst structure is provided with a first flat-plate part and a second flat-plate part which support, on surfaces thereof, a constituent having catalytic activity to an exhaust gas and face each other, and a stirring part which is provided in such a manner as to come into contact first with the first flat-plate part and the second flat-plate part in an extending manner from the first flat-plate part to the second flat-plate part at a prescribed angle with respect to the direction in which the exhaust gas flows.

Catalyst structure

An exhaust gas purification catalyst contains titanium oxide as a main component and an oxide of one element or two or more elements selected from the group consisting of tungsten (W), molybdenum (Mo), and vanadium (V) as an active component, wherein the exhaust gas purification catalyst contains phosphoric acid or a water soluble phosphoric acid compound so that the atomic ratio of phosphorus (P) to a catalytically active component represented by the following formula is more than 0 and 1.0 or less; P/catalytically active component (atomic ratio)=number of moles of P/(number of moles of W+number of moles of Mo+number of moles of V).

Exhaust gas purification catalyst suppressing influence of iron compound

A metal substrate for flue gas-denitration catalyst that, like SUS304, can be used without corroding is provided by improving the corrosion resistance of SUS430 substrate that is inexpensive and can easily be supplied stably. A method for producing the metal substrate for flue gas-denitration catalyst, wherein the method comprising the steps of: lath-processing a band-shaped steel plate made of ferrite stainless steel into a band-shaped metal lath; (1) degreasing process oil adhering to the metal lath; (2) passing the metal lath through a solution containing phosphoric acid and surfactant to load the solution; (3) draining off the excess solution; and (4) drying and heating the solution-loaded metal lath to react the phosphoric acid with the substrate, in which respective steps are carried out sequentially to form a film of phosphate compound on a surface of the substrate.

Method for producing metal substrate for flue gas denitration catalyst

An exhaust gas purification catalyst is made as a composition comprising titanium oxide (TiO), aluminum sulfate (Al(SO)), an oxide of vanadium (V), and an oxide of molybdenum (Mo) and/or tungsten (W), wherein on titanium oxide having sulfate ions and aluminum ions adsorbed thereon obtained by making contact with aluminum sulfate at more than 1 wt % and not more than 6 wt % relative to titanium oxide in the presence of water, an oxo acid salt of vanadium or a vanadyl salt and an oxo acid or an oxo acid salt of molybdenum and/or tungsten are supported in a proportion of more than 0 atom % and not more than 3 atom %, respectively. By this, the degradation of catalyst performance can be suppressed even with exhaust gas containing potassium compounds at a high concentration in combustion ash.

Exhaust gas purification catalyst and production method therefor, and method for purifying nitrogen oxide in exhaust gas

To overcome the problem of a conventional catalyst and to provide an exhaust gas purifying catalyst that meets the requirement concerning Hg oxidation activity and SOoxidation activity; i.e., an exhaust gas purifying catalyst which specifically reduces percent SOoxidation, while maintaining percent Hg oxidation at a high level. The invention provides an exhaust gas purifying catalyst which comprises a composition containing oxides of (i) titanium (Ti), (ii) molybdenum (Mo) and/or tungsten (W), (iii) vanadium (V), and (iv) phosphorus (P), wherein the catalyst contains Ti, Mo and/or W, and V in atomic proportions of 85 to 97.5:2 to 10: 0.5 to 10, and has an atomic ratio of P/(sum of V and Mo and/or W) of 0.5 to 1.5, and an exhaust gas purifying method comprising exposing an exhaust gas containing a nitrogen oxide (NO) and metallic mercury (Hg) to the catalyst in the presence of ammonia as a reducing agent, to thereby perform reduction of NOcontained in the exhaust gas and oxidation of metallic mercury (Hg) contained in the exhaust gas.

Exhaust gas purifying catalyst

The present invention provides a catalyst base material and a catalyst which have high strength, high porosity or high activity and methods of producing the catalyst base material and catalyst. The present invention relates to a method of producing a catalyst base material, the method comprising dispersing or dissolving a hydrophilic polymer coagulant as a first component, a water-soluble thickener as a second component, a colloidal inorganic binder as a third component and an inorganic fiber as a fourth component in water to form a catalytic slurry or paste, supporting the catalytic slurry or paste on a net-like substrate such that the meshes of the net-like substrate are filled up with the slurry or paste, by drying and/or calcinating the substrate.

Base for catalyst, catalyst and methods for producing those

To overcome the problem of a conventional catalyst and to provide an exhaust gas purifying catalyst that meets the requirement concerning Hg oxidation activity and SOoxidation activity; i.e., an exhaust gas purifying catalyst which specifically reduces percent SOoxidation, while maintaining percent Hg oxidation at a high level. The invention provides an exhaust gas purifying catalyst which comprises a composition containing oxides of (i) titanium (Ti), (ii) molybdenum (Mo) and/or tungsten (W), (iii) vanadium (V), and (iv) phosphorus (P), wherein the catalyst contains Ti, Mo and/or W, and V in atomic proportions of 85 to 97.5:2 to 10:0.5 to 10, and has an atomic ratio of P/(sum of V and Mo and/or W) of 0.5 to 1.5, and an exhaust gas purifying method comprising exposing an exhaust gas containing a nitrogen oxide (NO) and metallic mercury (Hg) to the catalyst in the presence of ammonia as a reducing agent, to thereby perform reduction of NOcontained in the exhaust gas and oxidation of metallic mercury (Hg) contained in the exhaust gas.

A particulate material removing filter for exhaust gas from a diesel engine is provided. The particulate material removing filter is formed by laminating metal laths having an oxidation catalyst layer containing a noble metal that oxidizes nitrogen oxide in exhaust gas into nitrogen dioxide. The metal laths are laminated to form a laminate in such a manner that the drawing direction of the metal lath processing differs by 90 degrees with each other.

Filter for exhaust gas from diesel engine and equipment

A particulate matter-removing filter being resistant to clogging and ash blocking, requiring no special means such as back-washing and heating combustion, and being formed of inexpensive materials; and exhaust emission controlling method and device using this. (1) A particulate-matter-containing exhaust emission controlling filter which uses as a basic unit a pair of porous corrugated sheet and a porous flat sheet that support an exhaust emission controlling catalyst, has a molding formed by laminating the porous corrugated sheets so that their ridge lines alternately cross perpendicularly, has one of side surfaces, perpendicularly crossing the corrugated sheet ridge lines, of the molding or mutually-adjoining two surfaces that are the perpendicularly-crossing side surfaces sealed, and has exhaust gas in-flow passage and out-flow passage respectively formed between porous corrugated sheets via a porous flat sheet. (2) A filter having the exhaust emission controlling catalyst that is an oxidizing catalyst for oxidizing nitrogen monoxide in an exhaust gas.

Particulate matter-containing exhaust emission controlling filter, exhaust emission controlling method and device

A method is disclosed for producing a NOcatalyst which includes dispersing a hydrated titanium dioxide or dried material, tungstic acid or a salt, and a sol-like material. The sol-like material is formed by dispersing cerium dioxide in a dispersion medium to form a catalyst slurry or paste. Supporting the catalyst slurry or paste is a catalyst carrier.

Production of catalyst for removal of introgen oxides

Disclosed are a method and an apparatus for treating an effluent containing ammonia in which method and apparatus NO concentration in the gas at the outlet of a catalyst tower does not rise to a high level even when the NHconcentration in the effluent was reduced and the amount of hazardous substances formed is small; in the method and apparatus, an NH-containing effluent A and a carrier gas (steam C and combustion gas F) are contacted in stripping towerto transfer the NHfrom the NH-containing effluent to a gas phase, the gas containing the generated NHis heated with pre-heaterand then contacted with catalyst layerplaced in catalyst towerto decompose the NHinto nitrogen and water; and at that time, the oxygen concentration in the gas to be introduced into catalyst towerand the NO concentration in the gas discharged from catalyst towerare determined by measuring instrumentsand, respectively, and the oxygen concentration in the gas to be introduced into catalyst toweris adjusted by adjusting valveso that the NO concentration becomes within a prescribed range.

Growing community of inventors

Kure, Japan

Naomi Imada