1247 results about "Tungsten trioxide" patented technology

Disclosed is a catalyst. The catalyst comprises palladium, gold, and a support comprising titanium dioxide and tungsten trioxide. The support preferably comprises from 75 wt % to 99 wt % of titanium dioxide and from 1 wt % to 25 wt % of tungsten trioxide. A method for preparing the catalyst is also disclosed. The method comprises impregnating the support with a palladium compound and a gold compound, calcining the impregnated support, and then reducing the calcined support. Further disclosed is a method for preparing vinyl acetate with the catalyst. The catalyst exhibits improved catalytic activity and selectivity.

The invention discloses a method for extracting tungsten, titanium and vanadium from a waste SCR (selective catalytic reduction) catalyst, which comprises the following steps: crushing the waste SCR catalyst, adding a strongly alkaline solution, and reacting; filtering, separating, then adding strong acid into the sodium tungstate and sodium vanadate mixed solution, and reacting to obtain tungstic acid and a sodium salt and vanadic acid mixed solution; regulating the pH value of the sodium salt and vanadic acid mixed solution until precipitate is separated out, thus obtaining ammonium vanadate; then adding sulfuric acid into the tungsten-and-vanadium-removed SCR catalyst, and reacting to obtain a titanyl sulfate solution and solids such as aluminum slag and the like; then adding water into the titanyl sulfate solution, and hydrolyzing to obtain titanic acid and a waste acid solution; and finally, respectively calcining the obtained ammonium vanadate, tungstic acid and titanic acid to obtain vanadium pentoxide, tungsten trioxide and titanium dioxide. According to the invention, tungsten, titanium and vanadium can be extracted from the SCR catalyst through the reaction with strong alkali and strong acid at a low temperature, the equipment requirement is low, the energy consumption is low, some products having added values can be coproduced, and no secondary pollution is generated, thereby facilitating popularization and application.

The invention relates to a method for recovering tungsten trioxide and ammonium metavanadate from a selective catalytic reduction (SCR) denitration catalyst. The method comprises the following steps of: crushing the SCR denitration catalyst, sieving to obtain catalyst powder, mixing with sodium carbonate, and stirring fully and uniformly; putting the mixed powder into a sintering furnace, and sintering to obtain a sintered material; keeping temperature for 1 hour, and sieving to obtain sintered material powder; pouring warm water, so that Na2WO4 and NaVO3 in the sintered material powder are dissolved fully, filtering, and removing precipitates to obtain a mixed solution of Na2WO4 and NaVO3; regulating the pH value to be 6.5-7.5, adding an ammonium bicarbonate solution or an ammonium chloride solution, and precipitating ammonium metavanadate precipitate; filtering, washing by using a diluted ammonium bicarbonate solution for 2 to 3 times, washing by using 30 percent ethanol for 1 to 2 times, and drying to obtain an ammonium metavanadate finished product; and converting the Na2WO4 in the residual solution into ammonium paratungstate, evaporating the residual solution to obtain ammonium paratungstate crystals, and calcining to obtain the tungsten trioxide. By the method, the ammonium metavanadate and the tungsten trioxide can be recovered, and the discharge of pollutants is reduced.

The invention relates to a method for recovering a tungsten component from a selective catalytic reduction denitrification catalyst, belonging to the technical field of waste catalyst recovery. The invention achieves the purpose of separating and purifying a tungsten component by high-temperature sodium salt roasting, organic phase extraction, ammonia water back extraction and other operations. According to the invention, tungsten trioxide in a catalyst can be separated from other acidic metal oxide, the contained tungsten element can be selectively extracted, no effect can be made on the recovery of other metal elements, and the recovery of the tungsten component can be realized basically.

The invention discloses a method for regeneration and resource utilization of a waste honeycombed denitrification catalyst. The method comprises the following steps of: crushing, grinding and sieving the waste catalyst; loading a mixture of the powdered catalyst and sodium carbonate into a sintering furnace to produce Na2WO4 and NaVO3, dissolving completely, adjusting the pH value to separate ammonium metavanadate precipitates, filtering, applying the remaining liquid to ammonium paratungstate extraction, washing the precipitates and oven-drying to obtain ammonium metavanadate, and making ammonium paratungstate crystals and tungsten trioxide. The regeneration method of the SCR catalyst comprises the following steps of: performing water-washing, pickling, activation and drying on the catalyst. The method for producing titanium pigment from the waste catalyst as raw material comprises the following steps of: performing pulverization, acidolysis and extraction on the waste catalyst, performing plate-frame pressure filtration; performing concentration, hydrolysis and suction-filtration on the catalyst, washing and blanching with sand leaching water, calcining, grinding and packaging. The method disclosed by the invention can effectively restore the activity of a deactivated catalyst and prolong the service life of the deactivated catalyst, which not only reduce the operating cost of a thermal power plant but also save the valuable rare earth resources.

The present invention relates to nanometer porous WO3 material, and is especially nanometer porous WO3 material formed through molecule self-assembling and with homogeneous structure, pore diameter of 60-150 nm, regular arrangement and (002) face oriented monoclinic system structure. The nanometer porous WO3 material is prepared through a constant current anode oxidation process with metal W substrate and electrolyte solution, which consists of inorganic fluoride sodium fluoride, potassium fluoride or ammonium fluoride and inorganic strong acid hydrofluoric acid, hydrochloric acid or sulfuric acid and has F- ion concentration of 0.05-0.3 mol/L and H+ ion concentration of 0.05-0.5 mol/L. The nanometer porous WO3 material has high photocatalytic capacity and is one kind of high efficiency photocatalyst.

The invention discloses a selective catalyst for removing oxynitrides from tail gases of diesel vehicles and a preparation method thereof. Cordierite honeycomb ceramic serves as a carrier, and the oxides of vanadium, zirconium, tungsten and titanium form a catalytic active site. The preparation method comprises the following steps of: sequentially dissolving vanadium pentoxide, a zircon salt, tungsten trioxide and titanium dioxide into the aqueous solution of oxalic acid, adding a bonder into the mixed solution to prepare pulp, impregnating the cordierite honeycomb ceramic in the pulp, drying the cordierite honeycomb ceramic for 1 to 3 hours at 100 to 150 DEG C, and roasting the cordierite honeycomb ceramic for 2 to 4 hours at 450 to 550 DEG C. In the invention, the preparation method is improved, and a powder catalyst is improved into a honeycomb selective catalytic reduction (SCR) catalyst applied to the removal of the oxynitrides from the tail gases of the diesel vehicles, so the high-efficiency catalytic removal of the oxynitrides can be realized at the temperature of 205 to 515 DEG C; and in the presence of steam or SO2, the activity of the catalyst is kept over 80 percent.

The invention relates to a method for separating tungsten and molybdenum. The method comprises the following steps: (1) adding acid into a tungsten-molybdenum mixed solution and adjusting pH value to obtain mixed sediment of tungsten acid and molybdenum acid; (2) adding hydrogen peroxide and acid into the mixed sediment to form peroxide tungsten acid and peroxide molybdenum acid; (3) heating an obtained mixed solution, adding tungsten powder, reacting and filtering to obtain tungsten acid sediment and a molybdenum-containing acid solution; (4) calcining the prepared tungsten acid to prepare tungsten trioxide or dissolving by using ammonium hydroxide to obtain an ammonium tungstate solution and then evaporating and crystallizing to prepare APT; (5) extracting the molybdenum in the obtained molybdenum-containing acid solution by using an extraction agent/ion exchange resin; and (6) reversely extracting molybdenum-containing organic phase/resin by using ammonium hydroxide to obtain the ammonium molybdate solution, and carrying out acid precipitation to obtain ammonium tetramolybdate. The production process of tungsten-molybdenum products is taken into account in the method, so that the separated tungsten acid or molybdenum can be directly used for preparing the products thereof; the separation effect is excellent; the operation process is simple and is liable to control; the industrial popularization and application are liable to implement.

A photocatalytic material containing tungsten trioxide fine particles having an average particle diameter of 0.5 μm or smaller and a crystal structure of a monoclinic crystal system as a main component.

A positive-electrode active material of a nonaqueous electrolyte secondary battery is modified to improve the output characteristics under various temperature conditions, thereby making the nonaqueous electrolyte secondary battery suitable for a power supply for hybrid vehicles. The nonaqueous electrolyte secondary battery includes a working electrode 11, a counter electrode 12 containing a negative-electrode active material, and a nonaqueous electrolyte solution 14. In the working electrode 11, a positive-electrode mixture layer containing a granular positive-electrode active material and a binder is disposed on both sides of a positive-electrode collector. The positive-electrode active material contains a lithium transition metal oxide Li_1.07Ni_0.46Co_0.19Mn_0.28O₂ and a tungsten trioxide attached to part of the surface of the lithium transition metal oxide.

The invention discloses a method for preparing nanometer tungstic oxide nanopowder. The method for producing the high-quality nanometer WO3 powder with high efficiency comprises the following steps: according to the rate of 1 to 1, 13.4 to15mol/L of ammonia and deionized water are prepared into the needed ammonia solution; tungstenic acid is dissolved into the prepared ammonia solution; citric acid which has the molar ratio with the tungstenic acid by 2 to 4 times is added into the solution, is heated at the temperature of between 80 and 90 DEG C and is stirred for 8 to 12 hours to obtain a yellowish transparent gel; the prepared gel is positioned in an infrared oven for roasting till brown expanded gel is obtained; and the gel obtained by the steps is calcined in a chamber furnace at the temperature of between 550 and 650 DEG C to obtain yellow nanometer tungstic oxide powder. Compared with the prior art, the method has the advantages of simple and feasible process,, less environmental pollution, less erosion to equipment and relatively low production cost.

The invention discloses a recovery method of a waste SCR (Selective Catalytic Reduction) catalyst, recovery cleaning fluid and a catalyst prepared from the recovered catalyst. Effective cleaning for a waste honeycomb type SCR catalyst is realized with cleaning fluid prepared from an isomeric C13 fatty alcohol-polyoxyethylene ether emulsifier and hydrofluoric acid and by an ultrasonic cleaning method; the waste honeycomb type SCR catalyst is crushed, cleaned and ground, and is mixed with titanium dioxide, tungsten trioxide, glass fibers and vanadium pentoxide, so that the waste SCR catalyst incapable of working continuously becomes a material for producing a fresh catalyst and is recycled. The method is easy to operate, the production cost can be obviously reduced, the emission of pollutants is reduced, and the performance of the product prepared from the waste catalyst recovery material is the same as that of a new product. The product has an environment-friendly effect, and recycling of the waste catalyst is realized.

The invention discloses a tungsten trioxide nano-film with photocatalytic performance, and a preparation method thereof. The tungsten trioxide nano-film is characterized in that a WO3 nano layer with a WO3 nano structure is grown on a WO3 crystal seed layer, and the WO3 nano structure is shaped like a two-dimensional flying saucer including a middle main sheet and a nano-column. The preparation method of the tungsten trioxide nano-film comprises the steps of preparing a tungsten acid crystal seed layer precursor solution, preparing FTO (Fluorine-doped Tin Oxide) conductive glass with the crystal seed layer, preparing thermal tungsten acid solvent precursor solution, and finally performing hydrothermal synthesis to obtain the tungsten trioxide nano-film. According to the tungsten trioxide nano-film with photocatalytic performance, and the preparation method thereof, the specific surface area of the WO3 nano layer can be effectively enlarged; the efficiency of photocatalytic water splitting can be improved, the performance of photocatalytic water splitting in a photoelectric chemical pool is excellent, and excellent chemical stability can be achieved, the preparation method is simple, and the low-cost and large-scale application can be realized.

The invention relates to the field of denitration catalyst, in particular to a recycling method of denitration catalyst waste. The recycling method comprises the following concrete steps: calcining unqualified denitration catalyst or denitration catalyst waste at the temperature of 500-700 DEG C for 10-20 hours; and grinding the calcined product into powder with particle size of 40-350 microns to obtain the recycled material of denitration catalyst. A method for preparing the denitration catalyst from the denitration catalyst waste comprises the steps of mixing, extruding, drying and calcining titanium dioxide, tungsten trioxide, denitration recycled material, vanadium pentoxide, glass fiber, citric acid solution and rare earth oxide by a conventional method. By adopting the recycling method, the operation is simple, and the production cost can be obviously lowered; the product prepared from the recycled material has the advantages of large specific area, large pore volume, strong compressive resistance and low wear rate; the catalyst is environment-friendly; and the waste is turned into wealth.

Tunable photonic crystals offer an interesting possibility to adjust the photonic band gap (PBG) as per requirement. Various methods of achieving this have been tried that include polarization of liquid crystals, thermal effects and more. Chromogenic devices provided in accordance with the present invention include combinations and subcombinations of electrochromic, photochromic, thermochromic devices featuring TMO based inverse opals having tunable photonic band gaps (PBG) for certain frequencies. Electrochromic (EC) materials in which a reversible optical property change can be induced with the application of a small electric field offer a novel possibility to tune the PBG in a controlled and reversible way. The reversible chemical change and the ensuing change of optical constants in these periodically arranged EC materials make the PBG tunability possible. In a recent work we have demonstrated for the first time the PBG tunability of EC materials deposited in the form of periodic inverse opals. This earlier work was carried out with the well known Tungsten Trioxide (WO₃) EC thin films into which lithium intercalation was done by a dry lithiation method. In the present work we report on the fabrication of a simple tunable photonic crystal device based on electrochemical insertion/extraction of lithium based on WO₃ inverse opals. In alternative embodiments, any suitable transparent conductor can be utilised instead of Indium Tin Oxide (ITO); any suitable electrochromic transition metal oxide, such as for example Molybdenum Oxide (MoO3), Vanadium Pentoxide (V₂O₅), Titanium Oxide (TiO₂), Chromium Oxide (Cr₂O₃), or Cerium Oxide (CeO₂) can be utilised instead of Tungsten Oxide (WO₃); and any suitable electrolyte solution can be utilised instead of LiClO₄ in Polypropylene Carbonate (LiClO₄/PC) solution.

The invention provides a catalytic agent for denitrating smoke and a preparation technology thereof. The catalytic agent for denitrating the smoke comprises the raw materials based on parts by weight as follows: 60%-90% of titanium dioxide, 3%-9% of tungsten trioxide, 0.5-3% of vanadium pentoxide, 2%-5% of organic binder, 10%-20% of inorganic binder, 7%-10% of glass fiber, 2%-4% of plasticizer, 20%-40% of water, 2%-4% of lubricant, 0.1%-1% of surface active agent and 3%-9% of neutralizer. After the content of the tungsten trioxide is reasonably proportioned, on the premise of guaranteeing thedenitration performance of the catalytic agent for denitrating the smoke, the absorption to sulfur dioxide is reduced, the SO2/SO3 conversion percentage is reduced, and the high-sulfur and high-ash use requirement of the coal quality in China is met.

The invention discloses a dye-sensitized solar cell photo-anode and a preparing method and application of the dye-sensitized solar cell photo-anode. The preparing method of the dye-sensitized solar cell photo-anode includes the following steps that heat treatment is carried out on a dopant and tungsten trioxide in acid to prepare powder, wherein the dopant is oxide or salt of metal M, the metal M can enter lattices of the tungsten trioxide after being dissolved in the acid, and the atomic orbital and the W5d orbital of the metal M can be hybridized; slurry is prepared from the powder; the surface of a conducting substrate is coated with the slurry to prepare the dye-sensitized solar cell photo-anode. The preparing method is simple in technology, and the prepared dye-sensitized solar cell photo-anode is applied to a dye-sensitized solar cell and has good photoelectric performance and good industrialization application prospects.

The invention discloses a diatomite coating capable of decomposing formaldehyde and relates to the field of coatings. The diatomite coating comprises the following components in percentage by mass: 5%-15% of titanium dioxide, 3%-10% of nano-titanium dioxide, 2%-8% of white carbon black, 1%-3% of nano-calcium carbonate, 2%-5% of nano-silicon dioxide, 6%-18% of nano-tungsten trioxide, 2%-8% of sepiolite material, 5%-7% of chitin, 3%-6% of graphene oxide, 0.5%-1.3% of mica powder, 1%-7% of nano-activated carbon, 0.1%-0.5% of a phthalocyanin compound and the balance of diatomite. The diatomite in the diatomite coating is capable of quickly decomposing organic compounds, purifying air and effectively improving the quality of indoor air; meanwhile, the indoor negative ion concentration can be increased, which is beneficial to the human body health.

The invention provides an iron-doped tungsten trioxide photocatalyst. The photocatalyst comprises tungsten trioxide powder particles, and the tungsten trioxide powder particles comprise iron oxide with different contents and states. The photocatalyst of the invention has a significantly increased photocatalytic rate. The invention also provides a preparation method of the iron-doped tungsten trioxide photocatalyst; tungsten-containing and iron-containing compounds are used as precursors; the raw materials are finally transformed into forms of WO3 and iron oxide by processes of mixing the two compounds, grinding, high-temperature calcining and the like; and the iron oxide is distributed in WO3 in different forms so as to obtain the iron-doped tungsten trioxide photocatalyst. The raw materials used by the invention have low cost, and the equipment is simple and easy to operate; when the obtained photocatalyst is compared with simple tungsten trioxide and iron oxide, the photocatalytic activity in ultraviolet light and visible light is increased by several times.

The present disclosure relates to a method of disinfecting a fluid comprising at least one live microbial organism. The method includes contacting the fluid comprising the at least one microbial organism with an effective amount of a photo-catalyst while exposing the fluid and the photo-catalyst to light from at least one light source with a wavelength of about 300-550 nm to reduce the number of the at least one live microbial organism to a predetermined level. The photo-catalyst comprises tungsten trioxide nanoparticles doped with palladium nanoparticles, and the palladium nanoparticles are present in an amount of about 0.1-5% of the total weight of the tungsten trioxide nanoparticles and the palladium nanoparticles.

The invention relates to a tungsten trioxide (WO3) nano-plate and a preparation method thereof. The tungsten trioxide (WO3) nano-plate is characterized in that: the tungsten trioxide (WO3) nano-plate is monocrystal and monoclinic phase (JCPDS No.43-1035), and is shaggy and flocculent; the area is (100-800)nmx(100-800)nm; the apparent thickness is between 5 and 40 nanometers; and the BET specific surface area can reach 100-250 square meters per gram. The preparation method for the tungsten trioxide (WO3) nano-plate comprises the following steps that: a tungstenic acid organic or inorganic laminated mixed micron/nano belt (pipe) is taken as a precursor, and organic substances between precursor layers are removed through oxidation by a nitric acid, and then a tungstenic acid (WO3.H2O) nano-plate is prepared; the reaction temperature is between 15 and 50 DEG C, and the reaction time is between 5 and 120 hours; the tungstenic acid (WO3.H2O) nano-plate is heated up to between 250 and 600 DEG C at a heating rate of between 1 and 5 DEG C per minute, undergoes heat insulation for 1 to 5 hours, and finally naturally cooled to the room temperature so as to remove crystal water, and the tungsten trioxide nano-plate is prepared. The method has a simple technological process, a large variation range of operating parameters, strong adaptability, low facility requirement, controllable appearance of products, high repeatability, high efficiency and low cost.

The invention discloses a preparation method for a high-performance transparent glass heat-insulating coating, comprising the following steps of: preparing a novel high-performance transparent mixed nano-slurry mixed and dispersed by blue WO3 (tungsten trioxide), ATO (antimony tin oxide) and ITO (indium tin oxide) at first, and then mixing, stirring and filtering by transparent polyurethane resinto obtain the transparent glass heat-insulating coating with high heat-insulating performance. The high-performance transparent glass heat-insulating coating prepared by the method disclosed by the invention has super-strong transparency, heat insulation and ultraviolet-preventing performance, and especially has very high heat-insulating performance in a near-infrared area ranging from 780 to 900nm; and the high-performance transparent glass heat-insulating coating can be widely applied to production for high-performance heat-insulating glass and high-performance heat-insulating window membrane, as well as has very important social and economic values.

A polymeric composition suitable for manufacturing pasteurizable containers comprising, polyethylene terephthalate (PET) in the ratio of about 80 to about 95 mass % by mass of the total composition; polyethylene naphthalate (PEN) in the ratio of about 20 to about 5 mass % by mass of the total composition; tungsten trioxide in the range of 10 to 100 ppm by mass of the composition and particle size of 2 to 20 microns; and optionally a nucleating agent and a polycondensation catalyst.

The invention discloses an electrochromic film adopting an amorphous/crystalline tungsten trioxide core-shell structure and a preparation method of the film. The method comprises steps as follows: white tungstic acid is dissolved in a hydrogen peroxide solution, the mixture is applied to a conductive surface of a conductive substrate, and a conductive substrate covered with a crystal seed layer is obtained; a tungsten source is dissolved in water, the pH value is adjusted, ammonium sulfate is added, a precursor solution is formed, a reaction is conducted in the precursor solution at the temperature of 150-250 DEG C for 4-10 h, and a tungsten trioxide nanowire array film is obtained. The tungsten source is dissolved in the water, the hydrogen peroxide is dropwise added, the pH value is adjusted, an electrodeposition solution is formed, and the film can be obtained through electrodeposition of amorphous tungsten oxide with a constant voltage method. The film prepared with the preparation method has the nanowire core-shell coating morphology, is good in electric connectivity and has the advantages of large spectrum adjusting range, high coloration efficiency and long cycle life, meanwhile, the preparation technology is convenient to control, the production cost is lower, massive production can be realized, and industrialization is easy to realize.

The invention discloses a multi-complex-metal-oxides catalyst and the preparation method. The catalyst carrier is multi-complex-metal-oxides solid alkali or surface solid alkali or the precursors of the solid alkali or surface solid alkali. The multi-complex-metal-oxides is complex oxides by combining two or more than two selections from alumina, titania, zirconium dioxide and ceria with one or more than one selections from magnesia, calcium oxide, baryta, potassium oxide and sodium oxide. Active ingredient is composed of cobalt oxides or /and nickel oxide and molybdenum trioxide or/and tungsten trioxide. The additive added to carriers or active components is the oxide of at least one of the following elements: cerium, lanthanum, zinc, zirconium, nickel or manganese. The invention has the advantages of high activity, high activity at low-temperature, high activity stability and wide temperature range of activity; high intensity, high intensity stability and high anti-hydration and anti-pulverization ability, wide water/gas ratio adaptability and wide range for impurity content. The catalyst of the invention is applied to the promotion of dirty water gas shift reaction.

The invention discloses a dust removal and waste gas decomposition double-effect filter material and a preparation method thereof. The filter material comprises a raw felt, catalyst powder and a coating. The filter material utilizes the raw felt as a carrier, the catalyst powder is adhered to the inside of the raw felt, and the coating is coated on the surface of the raw felt and is of a polytrifluorochloroethylene microporous film structure. The catalyst powder is in a grade of nanometer or micron and is selected from one or more of vanadium pentoxide, vanadium trioxide, tungsten trioxide, titanium dioxide and manganese dioxide. By utilizing the preparation method to prepare the filter material, the process is simple and easy to implement, and processing costs of preparation of catalyticfibers, film covering and the like are reduced. In addition, compared with a polytetrafluoroethylene microporous film, running resistance is low, and difficulties in follow-up sewing, transportation,installation and the like of the filter material are reduced simultaneously.