85results about "Tungsten oxides/hydroxides" patented technology

The invention relates to a method for preparing a rapid hydrochromic mesoporous tungsten oxide film based on a plasma etching technology. The preparation method comprises the following steps: mixing an amphoteric block copolymer template agent with a tungsten source precursor, and coating the surface of a substrate with obtained sol to construct an organic-inorganic hybrid film; then introducing oxygen-containing plasma to etch the hybrid film; and finally loading a catalyst layer on the surface of the film. By utilizing the synergistic effect of high-energy active particles and active oxygen species in the plasma, through coupling of physical bombardment and chemical oxidation / volatilization reaction, the rapid removal of the organic template is realized under a low-temperature condition, meanwhile, the structural integrity of a mesoporous skeleton is kept, and the pore collapse and the specific surface area loss caused by traditional high-temperature calcination are avoided. The obtained mesoporous WO3 thin film has a high specific surface area and abundant surface active sites, and hydrogen diffusion and interface reaction kinetics can be effectively improved, so that the coloring / fading response is remarkably accelerated, and the hydrogen-induced discoloration performance is improved.

A method for preparing a two-dimensional porous oxide belongs to the technical field of porous oxide preparation. The method includes the following steps: (1) using a metal salt as a precursor, an ion-intercalated two-dimensional oxide is prepared by a molten salt method; (2) the ion-intercalated two-dimensional oxide is mixed with a lithium initiator, reacted for a predetermined time, and then the unreacted lithium initiator is removed, filtered, and washed to obtain the two-dimensional porous oxide. The two-dimensional porous oxide prepared by this method forms uniform pores with a pore size range of 2-10 nm and a specific surface area of ​​200-300 m². 2 / g.

The application discloses a waste WC and W powder segmented temperature control oxygen-enriched deep oxidation process and belongs to the technical field of oxidation processes.The process comprises the following steps: first, raw material pretreatment; second, segmented oxygen-enriched oxidation; the pretreated powder is continuously fed into a segmented temperature control oxidation furnace; third, product collection; and fourth, tail gas purification; the tail gas generated in the segmented oxygen-enriched oxidation process is treated by a three-stage purification system including water washing, alkali absorption and activated carbon adsorption and then discharged. The segmented temperature control oxidation mode is adopted to divide the oxidation process into a low-temperature pretreatment section, a medium-temperature pre-oxidation section, a high-temperature deep oxidation section and a cooling and stabilizing section, and the parameters such as the temperature, oxygen-enriched concentration and residence time of each section are accurately matched to gradually promote the oxidation reaction of WC and W. In combination with a specific proportion of oxidation accelerators, the oxidation activation energy is effectively reduced, the deep oxidation of the waste WC and W powder is realized, no unoxidized WC and W residues are detected by XRD, and the problem of insufficient oxidation in the prior art is solved.

The invention discloses a low-energy-consumption solid fuel cell type oxygen sensor and a preparation method thereof. The low-energy-consumption solid fuel cell type oxygen sensor comprises a membrane electrode component, and the membrane electrode component comprises a first conductive substrate, an anode catalyst layer, a solid electrolyte layer, a cathode catalyst layer and a second conductive substrate which are sequentially stacked. The solid electrolyte layer is used for separating the anode catalyst layer and the cathode catalyst layer and conducting protons, a preparation material of the anode catalyst layer and a preparation material of the cathode catalyst layer respectively comprise carrier materials loaded with catalytic metal particles, and the anode catalyst layer is used for carrying out oxidation reaction; and the cathode catalyst layer is used for oxygen to generate electrochemical reduction reaction. The low-energy-consumption solid-state fuel cell type oxygen sensor is free of an external power supply, all-solid-state, long in service life and high in stability.

The invention discloses a method for realizing degradation of polyalkylene oxide compounds and controllable molecular weight through a promoter, which comprises the following steps: adding a photodegradation promoter into a high-molecular-weight polyalkylene oxide product, adjusting the proportion of the promoter and the proportion of effective components, and accurately controlling the shear molecular weight under the irradiation of an ozone emitter, so that the molecular weight of the polyalkylene oxide compounds is controllable. According to the invention, polyalkylene oxide with different molecular weights of 30,000-3,000,000 is prepared by using the photodegradation cocatalyst, so that the photodegradation cocatalyst can meet the requirements of customers in different fields, and meanwhile, the photodegradation cocatalyst prepared by the invention can be recycled to achieve the benefits of reducing cost and improving efficiency.

This invention relates to an atomic-level manufacturing method and apparatus for two-dimensional metal oxide nanosheets based on controllable micro-explosion, belonging to the field of functional nanomaterials and atomic-level precision manufacturing technology. This invention uses transition metal energetic complexes and energetic oxygen compounds as metal-oxygen integrated precursors. Under the constraint of an array-type nano-confined microcavity, controllable micro-explosions are synchronously triggered by nanosecond lasers to achieve nanosecond-level stoichiometric precision in the directional self-assembly of two-dimensional metal oxide nanosheets. The preparation cycle of this invention is reduced to less than 10 minutes, and the overall energy consumption is less than 1% of that of the traditional hydrothermal method. The product has excellent specific surface area, photocatalytic and cycling performance, and is 100% compatible with existing mass production lines. It is suitable for large-scale manufacturing in fields such as photocatalysis, energy storage, gas sensors, and environmental governance.

The application relates to a ruthenium-tungsten oxide material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) uniformly stirring water, glucose, urea, ruthenium chloride and cetyltrimethylammonium bromide to obtain solution A, and the solution is transparent, and then the solution is prepared; (2) adding tungsten chloride into ethanol and stirring to obtain solution B; (3) slowly adding solution B into solution A and uniformly stirring; (4) standing the mixed solution obtained above; (5) transferring the mixed solution obtained above into a drying box and drying; (6) calcining the dried product under an air atmosphere, annealing and cooling to room temperature to obtain the target product, i.e. the ruthenium-tungsten oxide material. Compared with the prior art, the application has the advantages of good chemical stability, excellent anti-physical structure deterioration and high tolerance to impurity ions.

The application belongs to the technical field of semiconductor gas sensitive material and sensor, and particularly relates to a selective gas sensitive material for a complex gas environment and a preparation method and application thereof. The gas sensitive material takes WO3 nanofiber as a substrate, composites ZnO nanoparticles on the surface of the substrate, and loads noble metal Ir to form an Ir-ZnO / WO3 ternary composite structure. The composite structure is obtained by adding WO3 nanofiber prepared by an electrospinning method, ZIF-8 precursor and Ir nanoparticles into an anhydrous ethanol solution, and then performing ultrasonic treatment and drying, and finally calcining under an air atmosphere. The material and the sensor exhibit high sensitivity and high selectivity to BTXs, and have good anti-interference ability and stability, and are suitable for real-time monitoring and early warning of BTXs leakage in a complex industrial site with multiple gas interference such as petrochemical industry and waste treatment.

A hafnium polyoxometalate compound-containing material of the present invention contains hafnium, an organic nitrogen compound, and a solvent, in which the ratio of an XRD maximum intensity (Ib) at a diffraction angle 2θ of 5° or more and 6° or less to an XRD maximum intensity (Ia) at a diffraction angle 2θ of 31° or more and 33° or less, Ib / Ia, in dried powder obtained by drying the hafnium polyoxometalate compound-containing material at 150°C for 15 hours in a vacuum atmosphere, is 1.2 or more. The hafnium polyoxometalate compound-containing material of the present invention contains hafnium, an organic nitrogen compound, and a solvent, in which a maximum value of transmittance in a wavelength region of 550 nm to 700 nm is 70%T or more.

The invention discloses a method for preparing a tungsten compound from artificial tungsten ore, which comprises the following steps: reacting sulfuric acid with the artificial tungsten ore to leach tungsten, and controlling the reaction conditions that the pH is 0.2-4.0, the temperature is 25-100 DEG C, the reaction time is 30 minutes to 6 hours, and the liquid-solid ratio is 1: 1-10: 1. And obtaining a metatungstate leaching solution after the reaction is completed, so that efficient leaching of tungsten is realized. And further performing purification and impurity removal on the solution to obtain a pure metatungstate solution. The pure metatungstate solution can be used for preparing different pure tungsten compound products such as solid metatungstate, phosphotungstic acid, ammonium phosphotungstate, tungsten oxide, ammonium metatungstate, ammonium paratungstate and tungstic acid. According to the technology, efficient leaching of tungsten under the mild condition can be achieved, high acid and high alkali are not needed in the whole process, and energy consumption and emission are greatly reduced; the obtained leachate is easy to purify to obtain a pure metatungstic acid solution, and the pure metatungstic acid solution can be directly used as a platform intermediate to flexibly prepare various tungsten chemicals.

The invention provides a ternary positive electrode material, a preparation method thereof and an electrochemical device. The ternary positive electrode material comprises a base material and a composite coating layer located on the outer layer of the base material, the base material comprises a ternary active substance, the composite coating layer contains Li2TiO3 and potassium-doped lithium tungsten bronze, the potassium-doped lithium tungsten bronze is a non-stoichiometric ratio compound, and the particle crushing index IC of the ternary positive electrode material meets the condition that IC is larger than or equal to 0 and smaller than or equal to 0.40. The composite coating layer of the ternary positive electrode material can improve the lithium ion conductivity of the ternary positive electrode material, can effectively relieve and disperse the stress on particles on a positive electrode plate in the charging and discharging process of a lithium battery using the ternary positive electrode material, and reduces the risk that the particles of the ternary positive electrode material are broken in the use process of the lithium battery; and the lithium battery has excellent storage performance.

There are provided a near-infrared shielding material fine particle dispersion body, a near-infrared shielding body, and a near-infrared shielding laminated structure containing composite tungsten oxide that exhibits more excellent near-infrared shielding function than that of a conventional near-infrared shielding material fine particle dispersion body, near-infrared shielding body, and near-infrared shielding laminated structure, and a method for producing the same. Also, there is provided a near-infrared shielding material fine particle dispersion body in which near-infrared shielding material fine particles are dispersed in a solid medium. The near-infrared shielding material fine particles are composite tungsten oxide fine particles containing a hexagonal crystal structure, in which a lattice constant of the composite tungsten oxide fine particles is 7.3850 Å or more and 7.4186 Å or less on the a-axis, and 7.5600 Å or more and 7.6240 Å or less on the c-axis, and a particle size of the near-infrared shielding material fine particles is 100 nm or less.

The invention discloses a preparation method and device for a two-dimensional mesoporous tungsten oxide gas-sensitive material, relates to the technical field of preparation of gas-sensitive materials, and aims at the design bottleneck of the current metal oxide semiconductor (MOS) gas-sensitive material. According to the invention, doping of rare earth elements (Ce, Er and Pr), modification of specific functional groups (-F,-OH,-SO3H and-NH2) inside and outside pore channels and modification of Pt nanocrystals are realized by using a beaker internally provided with a driving mechanism and a stirring mechanism, and preparation of a two-dimensional mesoporous tungsten oxide-based nanosheet (PP-2D-mpR / WO3) gas sensitive material with a specific pore diameter (10-15 nm) and a thickness (12-20 nm) and a device are realized. Based on the advantages that two-dimensional mesoporous tungsten oxide (2D-mpWO3) is large in specific surface area, ideal in mass transfer behavior, high in carrier transmission rate, highly ordered in structure, uniform in oxygen vacancy type and charge environment and the like, the response value is enhanced, the adsorption capacity of oxidation products is reduced and the recovery time is shortened through the sensitization effect of Pt nano particles with large sizes in pore channels; and the method can be expanded to high-resolution sensitive detection of other trace weak polar molecules.

The application belongs to the technical field of inorganic material preparation, and particularly relates to a twice calcined tungsten oxide and a preparation method and application thereof, the preparation method comprising: primary calcination: APT raw materials are added into an industrial rotary kiln with an inclination angle of 5-6 DEG at a feeding speed of 100-500 g / min for calcination to obtain primary calcined tungsten oxide; secondary calcination: the primary calcined tungsten oxide is added into an industrial rotary kiln with an inclination angle of 2-3 DEG at a feeding speed of 800-1000 g / min for calcination to obtain secondary calcined tungsten oxide. The preparation method uses simple equipment, and raw materials are easy to obtain, and the method is easy to be industrialized. By controlling the feeding rate, the inclination angle of the rotary kiln, the rotating speed and the calcination temperature, the obtained tungsten oxide has fine particle size, narrow bulk specific gravity and stable screening performance, and can be applied in ultra-fine crystal rods, petroleum catalysts and photocatalyst materials.

The present application relates to a kind of indium-poor tungsten bronze phase mosaic block assembled composite material and its preparation method, and the indium-poor tungsten bronze phase mosaic block assembled composite material is by In 0.02 WO3 is formed by WO3 compound, there are many tunnels consisting of the interval between tungsten and oxygen atom in the indium-poor tungsten bronze phase mosaic block assembled composite material, and indium ions are randomly distributed on both sides of the tunnel center position.Method: step one, create supersaturated sodium sulfate solution environment;Step two, in the supersaturated sodium sulfate solution environment obtained in step one, add indium nitrate, add NH4Cl hydrothermal reaction;Step three, centrifugation;Step four, sodium tungstate, oxalic acid and ammonium chloride are sequentially added to deionized water, drop into HCL, add the product of step three hydrothermal reaction, centrifugation and washing, finally the indium-poor tungsten bronze phase mosaic block assembled composite material is prepared.The material has high sensitivity to acetone gas, and the working temperature is low.

The invention relates to a Pd-SA / WOS ternary composite gas-sensitive material as well as a preparation method and application thereof, and belongs to the technical field of semiconductor gas sensors. According to the Pd-SA / WOS ternary composite gas-sensitive material, the microstructure of the ternary composite gas-sensitive material is that Pd is uniformly distributed on the surface of a WS2 / WO3 compound in a monatomic form, the WS2 / WO3 compound is of a flower-shaped structure assembled by WS2 / WO3 nanosheets, and the mass ratio of WS2 to WO3 in the WS2 / WO3 compound is 1: (1.2-1.8). The obtained material has high oxygen vacancy, high oxidation-reduction activity, optimized morphological characteristics and an ideal energy band structure. In the aspect of hydrogen detection, the material has the advantages of low working temperature, high response speed, high sensitivity, good selectivity and the like, and can be used for monitoring and early warning of hydrogen leakage.

Provided are surface-treated infrared-absorbing fine particles that are infrared-absorbing fine particles each having a crystallite size greater than or equal to 30 nm and a surface that is coated with a coating layer that contains at least one selected from a hydrolysis product of a metal chelate compound, a polymer of the hydrolysis product of the metal chelate compound, a hydrolysis product of a metal cyclic oligomer compound, and a polymer of the hydrolysis product of the metal cyclic oligomer compound.

The application belongs to the technical field of nanometer materials, and particularly relates to a WO3 / TiO2 composite material, a preparation method and application thereof. The application provides a preparation method of a WO3 / TiO2 composite material, which comprises the following steps: mixing a tungsten precursor, water and a sulfuric acid solution to perform a first hydrothermal reaction to obtain a first product; mixing the first product, a titanium precursor and water to perform a second hydrothermal reaction to obtain a second product; and performing heat treatment on the second product in a hydrogen-containing atmosphere to obtain the WO3 / TiO2 composite material. The application first prepares a WO3 material by using a hydrothermal method, then loads TiO2 nanoparticles on the material, and then performs heat treatment to obtain the WO3 / TiO2 composite material. The WO3 / TiO2 composite material prepared by the application has high sensitivity to ammonia, low detection lower limit, good selectivity, and can be detected at room temperature, and has good application prospect.

The invention discloses a method for gradient separation and recovery of vanadium, tungsten and titanium from a waste SCR (Selective Catalytic Reduction) catalyst, which realizes activation of titanium to obtain a product nano titanium dioxide by strictly controlling reaction conditions and using a leaching agent, realizes gradient leaching and separation of vanadium and tungsten to obtain products vanadium oxide and tungsten oxide, and has the advantages of high recovery rate and high recovery rate. And full-quantitative comprehensive utilization of the waste SCR catalyst is realized. The technology is a new technology which is easy to industrialize, short in process, low in energy consumption, green and environment-friendly. According to the method, the leaching rates of vanadium and tungsten both reach 99% or above and are far higher than the effect of the prior art.

The invention relates to a tungsten oxide nano material with an ultrafast photochromic response characteristic and a preparation method of the tungsten oxide nano material, and belongs to the technical field of photochromic materials. Aiming at the technical bottlenecks of complex preparation process, high production cost, severe reaction conditions, too high material filling ratio and the like commonly existing in the existing photochromic material, the invention innovatively provides a simple hydrothermal synthesis strategy with controllable size. According to the method, a tungsten source, a surfactant, an acid source and a dispersing agent are mixed according to a specific ratio, and the nanoscale tungsten oxide material with the ultrafast photochromic response characteristic can be prepared through a one-step hydrothermal method. The obtained product can realize 0.1 s rapid response and stable photochromic performance by virtue of unique microstructure and only needing 1% of solid content in a dispersion system. The novel nano material provides an innovative solution for solving the technical problem that the preparation cost and the color changing performance of a traditional photochromic material are difficult to consider at the same time, and has important popularization value and wide application prospects in the application field of photochromic materials such as intelligent windows, optical storage and optical filters.

The present invention relates to a cathode material for a zinc secondary battery including a tungsten oxide, a vanadium oxide, and a carbonaceous material, and a method for producing the same.

The application belongs to the technical field of photocatalytic materials, and particularly relates to a surface oxygen vacancy-containing tungsten trioxide and a preparation method and photocatalytic acetonitrile oxidation application thereof. The application adds a sodium tungstate solution dropwise into a hydrochloric acid solution under stirring, stirs after the dropwise addition is completed, centrifuges, washes and dries the precipitate after the reaction is completed, and obtains monoclinic tungsten trioxide; the obtained monoclinic tungsten trioxide is annealed to obtain the surface oxygen vacancy-containing tungsten trioxide. The surface oxygen vacancy-containing tungsten trioxide prepared by the application can photocatalyze the selective oxidation of acetonitrile to formic acid with high activity and high selectivity, realizes efficient degradation of acetonitrile and conversion into formic acid product which also has economic value. The application can degrade acetonitrile wastewater by means of photocatalysis, obtain formic acid product with high added value at the same time, greatly reduce the treatment cost, and the catalyst does not decrease in performance in a catalytic test of five cycles for 30 hours, and has wide application prospects in practical application.

The application discloses a kind of pre-transition metal oxide nanoparticles and its preparation method and oxygen reduction synthesis hydrogen peroxide application.The active component of the material is pre-transition metal oxide nanoparticles.Preparation method includes: with soluble pre-transition metal salt and ammonium chloride as raw material, dissolving, evaporating to dryness to obtain mixed precursor, then by calcining at different temperatures in tube furnace to obtain pre-transition metal oxide nanoparticles.The pre-transition metal oxide nanoparticles catalyst prepared can be used for oxygen reduction to prepare hydrogen peroxide, with very high hydrogen peroxide selectivity and excellent stability, greatly improving the energy utilization efficiency.The application has the characteristics of low cost, low energy consumption, simple operation, no security risks, etc., and is suitable for large-scale industrial production.

The invention provides a method for preparing nano tungsten trioxide from micron tungsten trioxide through photoelectric synergistic oxidation and etching and application of the nano tungsten trioxide in a ternary lithium battery, and belongs to the technical field of nano material preparation and new energy batteries. Micron tungsten trioxide is loaded on a titanium mesh to prepare an anode, a graphite plate is used as a cathode, ultraviolet irradiation is carried out on one side of the anode, and photoelectric synergistic oxidation and etching reaction are carried out to prepare the electrode. Citric acid radicals are selectively adsorbed on the high-energy crystal face of tungsten oxide through carboxyl, growth of the high-energy crystal face is strongly inhibited, and the low-energy crystal face is dominated and expanded, so that a regular appearance is formed. The anisotropic growth tendency of the direct-current electric field is broken through the pulsed electric field by means of periodic relaxation and mass transfer resetting, uniform and mild deposition is achieved, and isotropic crystals are obtained. The growth rates of different sites are coordinated through multiple paths of charge compensation, in-situ oxidation and dynamic passivation, and uniform and regular development of the morphology is promoted. The nano tungsten trioxide can be used as a positive electrode material additive to improve the electrochemical performance of the ternary lithium battery.

The application belongs to the technical field of functional materials, and particularly relates to super coarse plate-shaped tungsten oxide and a preparation method thereof. The preparation method of the super coarse plate-shaped tungsten oxide comprises the following steps: S1, ammonium tungstate is added into deionized water, and is stirred and dissolved at a temperature of 70-90 DEG C to obtain a clear ammonium tungstate solution; S2, the clear ammonium tungstate solution is cooled to normal temperature at a cooling rate of 0.5-2 DEG C / h, and then plate-shaped ammonium tungstate crystals are obtained by suction filtration; S3, the plate-shaped ammonium tungstate crystals are calcined to obtain super coarse plate-shaped tungsten oxide; the application uses ammonium tungstate as raw material, has high controllability, and obtains tungsten oxide with uniform particle size and complete plate shape through optimized crystallization and calcination, and the purity is greater than or equal to 99%, so that the problems of traditional tungsten oxide agglomeration and chaotic morphology are solved, the functional adaptability is strong, the plate-shaped structure can be oriented, the dielectric, breakdown and other performances are improved, and the application is suitable for multiple high-end scenes; the parameters are easy to control, the operation is simple, and the application is green and safe.

The invention belongs to the technical field of nano material preparation, and particularly relates to sphere-like nano tungsten oxide and a preparation method thereof.The preparation method of the sphere-like nano tungsten oxide comprises the following steps that S1, an ammonium tungstate solution is obtained; s2, dropwise adding liquid nitrogen into the ammonium tungstate solution to obtain a sphere-like nanocrystal; s3, calcining the sphere-like nanocrystals to obtain sphere-like nano tungsten oxide; the method is simple in process, high in controllability, easy in parameter adjustment, simple in raw materials and suitable for large-scale industrial enlarged production, a liquid nitrogen shock cooling process is introduced, and a solution is highly supersaturated instantly and generates a large number of fine crystal nucleuses in an ultralow-temperature environment; and small nitrogen bubbles formed by vaporization of liquid nitrogen effectively inhibit collision and agglomeration among new crystal nucleuses, so that good dispersity of the product is ensured.

The application relates to a preparation method of a composite hydrogen-induced color change film and relates to a preparation method of a color change film. In order to solve the problems of high cost and complex process of existing magnetron sputtering, plasma vapor deposition and other methods and equipment, sol and ZnO sol are prepared by adopting a sol-gel method; mixed sol is uniformly attached to the surface of a glass substrate by adopting a pulling and dipping method; and a composite hydrogen-induced color change film is prepared by adopting a thermal decomposition method and loading a catalyst. The application explores the optimal addition amount of ZnO and the optimal heat treatment temperature, and improves the response rate of the composite film to hydrogen. A catalyst loading method based on the thermal decomposition method is provided. The composite film has a fast response rate to hydrogen, good reversibility, obvious color difference before and after color change, can rapidly and accurately detect hydrogen leakage in the environment, and has a wide prospect in the field of hydrogen leakage detection. The application belongs to the technical field of hydrogen leakage detection.

The application relates to the technical field of semiconductor photocatalysis and functional nanomaterials, and discloses a two-step hydrothermal method for synthesizing high-purity orthorhombic WO3 crystals, which comprises the following steps: preparation of a precursor solution, addition of a complexing agent, protonation reaction, hydrothermal treatment, product collection and washing, drying treatment and calcination treatment; the two-step hydrothermal method uses concentrated sulfuric acid as a protonation reaction medium, avoids the introduction of an organic carbon additive, realizes accurate control of crystal nucleation and growth kinetics in the hydrothermal reaction process, promotes the formation of an orthorhombic structure, and obtains WO3 crystals with a cubic morphology, pure crystal form and inhibited surface defects; meanwhile, the addition of citric acid as a complexing agent can stabilize tungsten species and ensure uniform distribution of the precursor, and improves the integrity and uniformity of the crystal structure.

This invention belongs to the field of photochromic nanomaterials, and relates to tungsten oxide nanoparticles, a gel electrolyte, their preparation method, and applications. It provides hydrated tungsten oxide prepared by a chemical reaction in solution without drying. The hydrated tungsten oxide is added to water and dispersed evenly, then ethylene glycol is added, making the volume ratio of water to ethylene glycol 2–10:4–10. After sealing, the mixture is heated to 70–110°C and reacted for 15–45 min to obtain the final product. The dispersion concentration after the reaction is 0.5–8 mg / mL. The tungsten oxide nanoparticles prepared by this invention exhibit photochromic properties, and the preparation method is simple, low-cost, and environmentally friendly.