21 results about "Tungsten hexachloride" patented technology

The invention discloses a (Fe (OH) 2) ((OH) 0.25 (H2O) 0.5) / W18O49 composite material as well as a preparation method and application thereof, and belongs to the technical field of functional materials. The preparation method comprises the following steps: uniformly mixing and stirring cyclohexanol, acetylacetone and absolute ethyl alcohol, adding tungsten hexachloride, uniformly stirring at room temperature, then adding ferric trichloride, uniformly stirring at room temperature, carrying out hydrothermal reaction, washing and drying to obtain the (Fe (OH) 2) ((OH) 0.25 (H2O) 0.5) / W18O49 composite material. A mixed system of cyclohexanol, acetylacetone and absolute ethyl alcohol is utilized to synergistically solve the problems of advanced hydrolysis and agglomeration of metal ions; the oxygen vacancy of the W18O49 accelerates the conversion of the sodium polysulfide, and the Fe (OH) 2 derivative strengthens the chemical anchoring of the sodium polysulfide, thereby realizing the synergy of the anchoring and rapid conversion of the NaPSs. When being used as a sodium-sulfur battery positive electrode material catalyst, the catalyst shows excellent catalytic performance and rate capability, and still has the capacity of 420 mAh g <-1 > after circulating for 25000 circles under the large current density of 10 A g <-1 >. The strong adsorption characteristic of the hydroxylated iron-based component and the high catalytic activity of W18O49 are utilized to form a synergistic effect, and a new scheme is provided for breaking through the technical bottleneck of an RT Na-S battery.

The application discloses a flower ball-shaped bismuth disulfide / tungsten disulfide composite material and a preparation method and application thereof. Tungsten hexachloride is added into anhydrous ethanol solution and fully stirred, then bismuth nitrate pentahydrate is added into the mixed solution and stirred to uniformly disperse the bismuth nitrate pentahydrate into the solution, then thioacetamide is added and stirred to be uniform, the obtained solution is moved into a reaction kettle, and the reaction kettle is sealed and placed into a homogeneous reactor; after the reaction is completed, the product is taken out, washed and fully dried in a vacuum oven to obtain the composite material. The composite material has a thickness of 20-30 nm, and nanosheets are vertically grown on a self-assembled flower ball-shaped structure with a diameter of 350-400 nm; the composite material can be applied to preparation of a potassium ion battery negative electrode material, and the structure is more stable, the conductivity is better, and the electrochemical performance is greatly improved.

This invention discloses a WS2 / WO2 composite material, its preparation method, and its application in sodium-sulfur batteries, belonging to the field of functional material preparation technology. The method includes: mixing cyclohexanol and oleic acid evenly to obtain a mixed solvent; adding tungsten hexachloride to the mixed solvent and stirring at room temperature until dissolved to obtain a precursor solution; subjecting the precursor solution to a hydrothermal reaction, washing, and drying to obtain W2 / WO2. 18 O 49 Powder; W 18 O 49 After the powder and sulfur source undergo a thermally controlled reaction under an inert atmosphere, a WS2 / WO2 composite material is obtained. This invention prepares a WS2 / WO2 composite material with a unique three-dimensional heterostructure through a simplified two-step method. By integrating the strong adsorption properties of WS2 and the high catalytic activity of WO2, and through interfacial coupling, the conversion of sodium polysulfides is synergistically accelerated. At the same time, its preparation process is significantly more complex than existing technologies, and can effectively suppress the shuttle effect, improve reaction kinetics, and enhance battery cycle stability.

The invention discloses a WS2 / W composite material, a preparation method thereof and application of the WS2 / W composite material in a sodium-sulfur battery. The preparation method comprises the following steps: uniformly stirring isopropanol and acetone to obtain a mixed solution A; weighing tungsten hexachloride, adding the tungsten hexachloride into the mixed solution A, and uniformly stirring to obtain a mixed solution B; transferring into a reaction kettle, sealing and putting into a drying oven for reaction; after the reaction is finished, carrying out suction filtration and washing on a product by using industrial alcohol, and drying in a vacuum oven to obtain W18O49 powder; the method comprises the following steps: weighing W18O49 powder and sublimed sulfur, respectively and correspondingly placing the W18O49 powder and sublimed sulfur in a first porcelain boat and a second porcelain boat, then placing the second porcelain boat in the first porcelain boat, placing the second porcelain boat in a tubular furnace, introducing argon into a furnace chamber of the tubular furnace, after the pressure of the furnace chamber is increased to 0.2-0.3 MPa, keeping the airtightness of the system, heating to 1100-1300 DEG C at the rate of 20 DEG C / min, keeping the pressure at 0.2-0.3 MPa in the heating process, and keeping the temperature for 2-3 hours; and after the temperature reaches 1100-1300 DEG C, continuously preserving heat for 2 hours, introducing argon, cooling to room temperature, and collecting to obtain WS2 / W powder. The problems of poor conductivity of the sulfur positive electrode, polysulfide shuttle effect and slow reaction kinetics are solved.

The invention relates to the technical field of chemical engineering, in particular to a preparation method of tungsten pentachloride, which comprises the following steps: S1, feeding tungsten hexachloride into a fluidized bed reactor through gravity and inert gas flow, continuously introducing inert gas into the fluidized bed reactor, keeping the tungsten hexachloride in the fluidized bed reactor to be fluidized, preheating and preserving heat; s2, introducing mixed gas of nitrogen or inert gas and hydrogen into the fluidized bed reactor, and reacting in the fluidized bed reactor; and S3, collecting tungsten pentachloride. The equipment and operation are simple, continuous production of high-quality tungsten pentachloride can be achieved, the technological process is simple, the operation unit is small, daily operation and maintenance are simple, and automatic control is facilitated.

This invention discloses an alkaline earth metal Ca-doped W 18 O 49 This invention relates to a catalyst, its preparation method, and its application, belonging to the field of functional materials. The method includes: 1) mixing 40-50 mL of anhydrous ethanol and 10-20 mL of acetone and stirring to obtain mixed solution A; 2) weighing 0.001-0.003 mol of tungsten hexachloride and adding it to mixed solution A, and stirring to obtain mixed solution B; 3) weighing CaCl2 according to nCa:nW = 0.01-0.05 and adding it to mixed solution B, and stirring to obtain mixed solution C; 4) transferring mixed solution C to a reaction vessel, sealing it, and placing it in an oven, reacting at 190-210℃ for 6-12 h; 5) after the reaction is complete, washing the product with industrial alcohol by filtration, drying it in a vacuum oven at 50-80℃ for 10-30 min, and collecting the product. This invention solves the problem of single W 18 O 49 Catalysts often suffer from insufficient electronic conductivity, limited utilization of active sites, and poor stability. This invention increases the number of oxygen vacancies and the density of active sites, while simultaneously improving the ion transport channels of the material and enhancing its adsorption and anchoring ability for polar polysulfides.

This invention discloses a method for preparing MnO2-WO3-CNT composite material for treating chromium-containing wastewater, comprising the following steps: (1) Preparation of MnO2-CNT solution: carbon nanotubes are dispersed in KMnO4 solution and mixed, Mn(Ac)2 solution is added and mixed thoroughly to obtain MnO2-CNT solution; (2) Preparation of powdered MnO2-CNT composite material: after removing the supernatant from the prepared MnO2-CNT solution, centrifuge and wash, dry and grind to obtain powdered MnO2-CNT composite material; (3) Preparation of MnO2-WO3-CNT composite material: the MnO2-CNT composite material powder is dispersed in tungsten hexachloride solution, stirred for 1-4 hours, centrifuged, washed and dried, the dried product is ground and calcined, and after calcination, the product is taken out to obtain MnO2-WO3-CNT composite material. The preparation method provided by this invention is simple, does not cause serious pollution, and is inexpensive. It achieves the conversion of hexavalent chromium to trivalent chromium by introducing tungsten oxide and manganese dioxide into carbon nanotubes to form MnO2-WO3-CNT composite material, providing a new approach for treating chromium-containing wastewater.

The present invention relates to a preparation method capable of improving thermoelectric properties of a tin(II) selenide-based material via combination of composition regulation and mesoscopically ordered regulation, belonging to the technical field of the preparation of high-performance thermoelectric materials. The molecular formula of the tin(II) selenide-based material of the present invention is Sn(1-x)Se(0.93-6x)(WCl6)x. Raw materials thereof comprise tin granules, selenium granules and tungsten hexachloride powder. The preparation method comprises: weighing raw materials in a glovebox according to the atomic mass ratio; using a double-layer quartz tube, vacuumizing same, and putting the raw materials into a muffle furnace to melt and react same; then milling an obtained ingot by using a mortar in the glovebox to obtain a composition-regulated Sn(1-x)Se(0.93-6x)(WCl6)x powder; then performing spark plasma sintering on the Sn(1-x)Se(0.93-6x)(WCl6)x powder by successively using graphite molds having different inner diameters, so as to induce and arrange the orientation of grain growth, so that the tin(II) selenide-based thermoelectric material can grow under mesoscopically ordered regulation, thereby improving electrical, thermal and mechanical properties. The tin(II) selenide-based thermoelectric material prepared via composition regulation and mesoscopically ordered regulation has effectively improved electrical, thermal and mechanical properties.

The invention discloses a W18O49 / WS2 composite material, a preparation method thereof and application of the W18O49 / WS2 composite material in a sodium-sulfur battery, and belongs to the field of electrochemical catalysis functional materials.The preparation method comprises the steps that 1, 10-20 mL of cyclohexanol is added into 20-30 mL of acetylacetone, and stirring is conducted to obtain a mixed solution A; 2) weighing 1-1.5 g of tungsten hexachloride, adding the tungsten hexachloride into the mixed solution A, and stirring to obtain a mixed solution B; (3) transferring the mixed solution B into a reaction kettle, sealing, putting into a drying oven, and reacting for 5-8 hours at 175-200 DEG C; 4) after the reaction is finished, performing suction filtration and washing on a product, drying in a vacuum oven, and collecting to obtain W18O49 powder; the preparation method comprises the following steps of 1, weighing W18O49 powder and thioacetamide according to a ratio of nW: nS of 0.125-0.5, and respectively placing the W18O49 powder and thioacetamide in a porcelain boat, and 6, simultaneously placing the porcelain boat in a tubular furnace, introducing an argon-hydrogen mixed gas, closing the gas, heating to 400-700 DEG C, carrying out heat preservation, and collecting to obtain W18O49 / WS2 powder.The preparation method solves the problems that an existing W18O49 / WS2 composite material is abnormal in electronic characteristics, the growth rate of a W18O49 core and the growth rate of a WS2 shell layer are not matched, deposition of WS2 on the surface of W18O49 is uneven, and active site distribution is unbalanced.

The invention discloses a method for preparing ultrafine tungsten carbide powder assisted by ammonium metatungstate, wherein the preparation method generally includes dissolving tungsten hexachloride and hydroquinone in ethanol and stirring and dissolving them as raw materials at room temperature, and then mixing the two to obtain a clear mixed solution; ammonium metatungstate is added to the above-mentioned mixed solution, and stirred evenly, and then placed in a water bath to react for a period of time; the mixed solution after the reaction is completed is placed in an oven for drying and ground into powder; the powder is then placed in a high-temperature tube furnace, and protective gas is introduced into the tube furnace, and calcined at 1100-1500°C for 60-480min to obtain tungsten carbide powder. The embodiment of the present invention not only has a simple preparation process, an easy-to-control reaction process, a short production cycle, and low cost, but also the prepared tungsten carbide powder has a high purity, a finer particle size, and a low free carbon content, and can be widely used in the hard alloy fields of industrial machinery, cutting tools, abrasives, and other finishing processes.

The invention discloses a preparation method of a vertical array W18O49 material. The preparation method comprises the following steps: S1, measuring 30-50 mL of cycloethanol and 10-20 mL of acetylacetone, and uniformly mixing in a container to obtain a solution A; s2, adding 1-3 g of tungsten hexachloride into the solution A, and uniformly mixing to obtain a solution B; s3, transferring the solution B into a 100mL reaction kettle, sealing, putting into a drying oven, and carrying out hydrothermal reaction at 180-220 DEG C to obtain a product; and S4, carrying out suction filtration and washing on the obtained product through a solvent combination, and drying in a vacuum oven to obtain W18O49 powder. W18O49 can provide abundant active sites for capture and interaction of NaPSs, reaction dynamic characteristics of the battery are remarkably improved, more excellent cycling stability and rate performance are obtained, the reaction is easy to control, the product purity is high, purification through post-treatment is not needed, common materials which are low in price and easy to obtain are selected, the preparation cost is remarkably reduced, and the method is suitable for industrial production. And efficient conversion of energy can be realized.

The present invention discloses a gourd-shaped niobium trisulfide / tungsten disulfide composite material, a preparation method thereof, and an application thereof in potassium ion batteries, belonging to the technical field of functional material synthesis. Tungsten hexachloride is added to an ethanol solution, thioacetamide is added, and then niobium pentachloride is added. After hydrothermal reaction, washing, and drying, a gourd-shaped niobium trisulfide / tungsten disulfide composite material is obtained; the morphological structure of the intertwined short fibers and the gourd-shaped structure, as the channels for metal ions to enter and exit, is conducive to the storage and transmission of metal ions; the combination of tungsten disulfide and niobium trisulfide improves the electrochemical performance of tungsten disulfide, well buffers the conductivity of the electrode material, and effectively improves the capacity of the tungsten disulfide negative electrode material. The one-step template-free hydrothermal reaction has a low synthesis temperature, a simple synthesis path, is easy to control, efficient, low-cost, and does not require large equipment and harsh reaction conditions. The whole reaction has a high yield and is environmentally friendly, and the product does not require post-treatment, being suitable for large-scale production.

The invention discloses a crystalline molybdenum-doped tungsten oxide nanocrystalline film and a preparation method and application thereof, and the method comprises the following steps: uniformly mixing tungsten hexachloride, an organic matter and molybdenum acetylacetonate with a solvent to prepare a molybdenum-doped precursor solution; the precursor solution is heated to 180-240 DEG C, heat preservation is conducted for 3-5 hours, and a molybdenum-doped tungsten oxide nanocrystalline solution is obtained; the preparation method comprises the following steps of: filtering and washing for multiple times, drying to obtain molybdenum-doped tungsten oxide nanocrystalline powder, dissolving the powder in methylbenzene to obtain printing ink, and spin-coating ITO (Indium Tin Oxide) conductive glass to obtain the molybdenum-doped tungsten oxide nanocrystalline film. The molybdenum-doped tungsten oxide nanocrystalline film with a high crystalline state is obtained by adopting a two-step annealing method and has the characteristics of large optical modulation range, long cycle life, good energy storage effect and the like, and neutral color conversion of the tungsten oxide film in a color changing process is realized. The material can be applied to various occasions such as new energy automobile sunroofs and electrochromic intelligent windows.

The present invention discloses a photo-thermal dual-driven color-changing composite film and a preparation method thereof. Vanadyl oxalate, polyvinylpyrrolidone, and ammonium metatungstate are mixed in deionized water, and after sufficient stirring, ultrasonic treatment is carried out to obtain a vanadium coating solution; tungsten hexachloride and absolute ethanol are used as raw materials, and titanium tetrachloride is used as the Ti source, and Ti-doped W 18 O 49 particles are prepared by a solvothermal method; they are mechanically ball-milled until the nanoparticles are mixed with ethanol to obtain a tungsten oxide coating solution; the obtained vanadium coating solution is formed into a film by spin coating and dried to obtain a precursor film; it is annealed in a tube furnace to obtain a tungsten-doped monodisperse vanadium dioxide nanoparticle film; the tungsten oxide coating solution is formed into a film on the tungsten-doped monodisperse vanadium dioxide nanoparticle film by spin coating; the present invention has excellent sunlight regulation efficiency and a low VO2 phase transition temperature under the condition of maintaining a high visible light transmittance; at the same time, due to the attachment of the W 18 O 49 -based film, the oxidation and denaturation of VO2 can be inhibited.

The invention relates to an NO gas-sensitive material, a preparation method thereof and application of the NO gas-sensitive material in a sensor, and belongs to the technical field of gas sensing. The NO gas sensitive material is metal-doped tungsten trioxide, and the metal doping amount in the NO gas sensitive material is 1-5 mol%; the metal is In, Nb, V and Ta. Tungsten hexachloride, n-heptane and metal chloride are mixed to prepare a mixed solution; carrying out heating reaction on the mixed solution to obtain a coarse precipitate, and centrifuging and washing the coarse precipitate to obtain a fine precipitate; and drying, grinding and calcining the fine precipitate to obtain the NO gas-sensitive material. The preparation method of the NO gas-sensitive material is simple and has controllability and repeatability, the NO gas-sensitive material shows excellent response sensitivity when being used for the NO gas sensor, and the NO gas-sensitive material has the advantages of accurate response sensitivity, gas interference resistance, long-term use stability and the like when being applied to the NO gas sensor based on a temperature modulation detection method; the device is especially suitable for detecting NO gas exhaled by a human body.

The present invention relates to a process for the co-production of tungsten halides and carbon tetrafluoride. Tungsten carbide or a mixture of tungsten carbide and carbon is added to a reactor, chlorine trifluoride gas is introduced into the reactor, the reactor temperature is controlled at 340-400°C, the reaction pressure is 0.01-0.15 MPa, and a reaction is carried out to obtain a mixture comprising tungsten hexachloride, tungsten pentachloride, tungsten hexafluoride, and carbon tetrafluoride. After the reaction is completed, the reaction products are sequentially collected through a four-stage cold trap, with the first stage collecting tungsten hexachloride, the second stage collecting tungsten pentachloride, the third stage collecting tungsten hexafluoride, and the fourth stage collecting carbon tetrafluoride. The present invention has relatively mild reaction conditions, a reaction temperature below 400°C, higher safety, low raw material cost, high atom economy, higher safety, lower energy consumption, no by-products, and great economic benefits and development prospects. It meets the production requirements of chemical enterprises for safety, environmental protection, high efficiency, and circular economy.

The invention relates to the technical field of electrochromism, in particular to a preparation method of an inorganic ligand modified tungsten oxide nanocrystalline flexible electrochromic film. The method comprises the following steps: forming a precursor solution from tungsten hexachloride, oleylamine and oleic acid, carrying out solvothermal reaction to form organic ligand modified tungsten oxide nanocrystal ink, then carrying out ligand exchange on the organic ligand modified tungsten oxide nanocrystal ink and Meerwein salt to form inorganic ligand modified tungsten oxide nanocrystal ink, and finally spin-coating the inorganic ligand modified tungsten oxide nanocrystal ink on the surface of a pretreated PET-ITO substrate, so as to obtain the PET-ITO film. And ultraviolet illumination and low-temperature annealing treatment are combined to prepare the flexible electrochromic film. The method is mild in preparation condition and simple and convenient in process, and the obtained film has relatively high optical contrast and coloring efficiency, relatively high coloring and fading response speed, relatively high transparency in a fading state and good mechanical flexibility and cycling stability, and is suitable for the fields of intelligent wearable equipment, flexible display, intelligent windows and the like.

The application discloses a preparation method of "peeling pomelo" shaped tungsten disulfide microspheres, and belongs to the technical field of inorganic materials. First, a phenoxyl tungsten complex is obtained by reacting tungsten hexachloride with a phenolic ligand under anhydrous and oxygen-free conditions; meanwhile, nanocrystals are obtained by dissolving thioacetamide in anhydrous ethanol, heating and dissolving, and naturally cooling; then, the phenoxyl tungsten complex solution is added dropwise into the thioacetamide nanocrystals, the mixture is uniformly transferred into a hydrothermal reaction kettle, hydrothermal reaction is carried out at 180-270 DEG C for 24-48h, and after washing and drying, the "peeling pomelo" shaped tungsten disulfide microspheres are obtained. The tungsten disulfide microspheres prepared by the method have a unique "peeling pomelo" shape, high specific surface area, rich pores, in-situ curling of nanosheets, stable structure formed by edge-to-edge and edge-to-face lapping, clean surface without residues, fully exposed active sites, and are suitable for being used in the fields of catalysis, energy storage and lubrication.

The application belongs to the technical field of nanocomposite preparation, and particularly relates to a tungsten-doped Prussian blue nanocomposite, a preparation method and application. The tungsten-doped Prussian blue nanocomposite prepared by a one-pot hydrothermal method with polyvinylpyrrolidone as a reducing agent and a stabilizer, tungsten hexachloride, citric acid and potassium ferricyanide as reactants has excellent ROS scavenging capacity, can protect intestinal epithelial cells and treat IBD, and then a colon-targeted delivery material is prepared by taking a hydrogel as a carrier, so that W-PB is accurately delivered to the colon site, the subsequent alkaline environment causes the hydrogel to disintegrate and release W-PB, and W ions are further released, so that the colon is released in a responsive manner, and the systemic toxicity of tungsten ions is avoided.

The invention discloses ligand-modified tungsten oxide nanocrystalline ink and a preparation method and application thereof, and the method comprises the following steps: uniformly mixing tungsten hexachloride, oleylamine, oleic acid and a solvent to prepare a precursor solution; heating the precursor solution to 150-250 DEG C, and keeping the temperature for 2-4 hours to obtain a tungsten oxide nanocrystalline solution with ligand modification on the surface; adding a precipitator into the tungsten oxide nanocrystal solution with the surface modified by the ligand, standing, and centrifugally cleaning to obtain tungsten oxide nanocrystals with the surface modified by the ligand; the preparation method comprises the following steps: dissolving tungsten oxide nanocrystals with ligand modification on the surface in 1.3. 5-trimethylbenzene, continuously adding a precipitator, standing, and centrifugally cleaning to remove redundant oleylamine and oleic acid; and the precipitate obtained after centrifugal cleaning is dissolved in 1, 3, 5-trimethylbenzene, and the tungsten oxide nanocrystalline ink modified by the ligand can be prepared. The ink is used for preparing a ligand-modified tungsten oxide nanocrystalline high-contrast electrochromic film, and has the characteristics of high contrast, high response speed and the like.

The application discloses a Ru-doped W 18 O 49 Composite material, preparation method and application in sodium-sulfur battery, belong to the technical field of functional material preparation. The method comprises the following steps: uniformly mixing butanol, acetone and deionized water, adding tungsten hexachloride and ruthenium trichloride, uniformly stirring at room temperature, then adding sodium dodecyl sulfate, uniformly stirring at room temperature again, and obtaining Ru-doped W 18 O 49 Composite material through hydrothermal reaction, washing and drying. The Ru-doped W 18 O 49 Nanowire is prepared in high purity and high activity through synergistic regulation of a ternary solvent system and Ru doping, is rich in oxygen vacancies and Ru-W double active sites, significantly enhances the adsorption and step-by-step catalytic conversion capacity of polysulfides, and solves the problems of insufficient catalytic activity and kinetic sluggishness. The obtained Ru-doped W 18 O 49 Composite material still has a capacity of about 1250 mAh g ‑1 After 300 cycles at a current density of 1 A g ‑1 , and has excellent rate performance.