42 results about "Tungsten Compounds" patented technology

The application discloses a high-nickel positive electrode material and a preparation method and application thereof, and belongs to the technical field of new energy sources. x Co y M z M´ w O2 and a porous base material and a gap-filling substance, wherein 0.80<=x<=0.98, 0.02<=y<=0.20, 0<=z<=0.06, 0<w<=0.02; x+y+z+w=1; M is at least one of Mn and Al, M´ is at least one of Y, Sr, La, B, Mg and Ti; the gap-filling substance exists in the inside of the pores and comprises a sintered product derived from an additive B, the additive B comprises a zirconium-containing compound and at least one of a tungsten-containing compound, an antimony-containing compound and a bismuth-containing compound. The high-nickel positive electrode material has excellent long cycle performance and rate performance. The application further provides a preparation method and application of the high-nickel positive electrode material.

Provided is a method for preparing a diol. In the method, a saccharide and hydrogen as raw materials are contacted with a catalyst in water to prepare the diol. The employed catalyst is a composite catalyst comprised of a main catalyst and a cocatalyst, wherein the main catalyst is a water-insoluble acid-resistant alloy; and the cocatalyst is a soluble tungstate and / or soluble tungsten compound. The method uses an acid-resistant, inexpensive and stable alloy needless of a support as a main catalyst, and can guarantee a high yield of the diol in the case where the production cost is relatively low.

The invention belongs to the technical field of recycling of rare and noble metal secondary resources, and discloses a method for preparing a tungsten compound and chloroplatinate from a waste catalyst and application of the method. The method comprises the following steps: (1) firing and crushing the waste catalyst, (2) reacting the waste catalyst with acid, (3) filtering and discarding filtrate, (4) reacting the precipitate with ammonia water, filtering to obtain an ammonium tungstate solution, and retaining filter residues; (5) concentrating the ammonium tungstate solution, crystallizing, separating and drying to obtain an ammonium paratungstate finished product; and (6) reacting the filter residues retained in the step (4) with aqua regia to prepare chloroplatinate. And (7) firing the ammonium paratungstate at a high temperature to obtain tungsten trioxide. According to the method, tungsten and platinum can be effectively separated from the carrier, and the recovery rate of rare and precious metals is increased.

To provide a coating liquid for a positive electrode active material capable of suppressing elution of lithium contained in the positive electrode active material into the coating liquid and constituting an all-solid-state lithium ion secondary battery having stable battery performance, and to provide a method of manufacturing a positive electrode active material with a coating film.SOLUTION: A coating liquid for a positive electrode active material, which is used for forming a coating film made of a composite compound of lithium and tungsten on a positive electrode active material containing lithium, includes an aqueous solution containing a lithium compound and a tungsten compound, and has a lithium concentration in a range of more than 3. 0mol / L and 5. 3mol / L or less. A method for producing a positive electrode active material with a coating film having a coating film composed of a composite compound of lithium and tungsten on a surface of a positive electrode active material containing lithium includes attaching the above-described coating liquid for a positive electrode active material to the surface of the positive electrode active material, followed by drying.SELECTED DRAWING: None

The invention discloses an O-phase sodium ion battery positive electrode material modified by a sodium tungstate-magnesium tungstate composite coating layer and a preparation method of the O-phase sodium ion battery positive electrode material. Relates to the technical field of sodium-ion battery materials. According to the preparation method, an in-situ coating strategy is adopted, the raw materials capable of reacting with the sodium compound are added, residual alkali on the surface of the material is consumed, meanwhile, a stable and uniform coating layer is formed on the surface of the material, and the prepared O-phase sodium ion battery positive electrode material has excellent electrochemical performance; a tungsten-containing compound and a magnesium-containing compound are added in the secondary sintering process, the tungsten-containing compound and the magnesium-containing compound form magnesium tungstate in the sintering process, and meanwhile, the tungsten-containing compound and a sodium source on the surface of the material form sodium tungstate; a double-coating layer formed by magnesium tungstate and sodium tungstate prevents the material from being in contact with an electrolyte, reduces side reaction and improves the cycling stability, and meanwhile, sodium tungstate is preferentially decomposed in the primary cycle of the battery and serves as a sodium supplementing agent, so that the first effect of the material is remarkably improved.

The invention discloses a supported Ni-based alloy catalyst preparation method, which comprises: S1, dissolving a tungsten compound in water, loading on an Al2O3 carrier through an impregnation method, aging, drying, and roasting in air to obtain an intermediate; and S2, dissolving a nickel compound in water, loading the nickel compound on the intermediate through an impregnation method, aging, drying, roasting in air, and performing reduction treatment in an H2 atmosphere to obtain the catalyst. The catalyst is high in activity, good in selectivity and stability, simple in preparation method and low in cost.

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 application discloses a preparation method of DL-tartaric acid, which uses maleic anhydride as raw material, uses WO3-SiO2-ZrO2 solid acid as a catalyst, and is prepared through catalytic oxidation reaction under the condition of an oxidant. The catalyst is prepared through the following steps: mixing and dissolving a tungsten-containing compound and a zirconium-containing compound; adding silica sol, a surfactant and a precipitant to form a gel, and then performing filtration, washing and calcination to obtain the catalyst. Since the active species and the carrier in the catalyst have strong interaction, the recycling rate of the catalyst is high, so that the residual amount of heavy metal tungsten in the prepared tartaric acid crystal is effectively reduced, the DL-tartaric acid yield is still high during recycling, the production cost of the tartaric acid is reduced, and the catalyst is suitable for large-scale production.

The invention relates to tungsten-doped tin dioxide nano-powder, a preparation method thereof and application of the tungsten-doped tin dioxide nano-powder in a semiconductor type gas sensitive element. The preparation method of the tungsten-doped tin dioxide nano-powder comprises the following steps: dissolving a soluble tungsten compound and a soluble tin compound in an aqueous solution containing a surfactant, and adding a complexing agent to obtain a uniform metal ion mixed solution; adding a precipitant into the mixed solution under a stirring condition, and adjusting the pH value to 2-6 to precipitate the metal hydroxide precursor; performing aging, solid-liquid separation, washing and drying on the precipitate to obtain precursor powder; adding a dispersing agent into the precursor powder, and uniformly mixing; and calcining to obtain the tungsten-doped tin dioxide nano powder. The tungsten-doped tin dioxide nano-powder can be used for preparing a semiconductor type gas sensor, an ultraviolet detector, a lithium ion battery negative electrode material, a catalyst or a transparent conductive film.

The present application relates to the field of ethylene glycol preparation, and discloses a method for preparing ethylene glycol. The method comprises the following steps: in the presence of water, a polyhydroxy compound and hydrogen are reacted with a catalyst; the catalyst comprises a metal / COFs material and a tungsten-containing compound; wherein the COFs material in the metal / COFs material is selected from at least one of nitrogen-containing organic framework materials; and the metal in the metal / COFs material is selected from at least one of noble metal elements and nickel elements. The method for preparing ethylene glycol has high ethylene glycol selectivity and yield; and the catalyst used in the method has good cycle stability.

The application discloses a tungsten-boron stainless steel composite material and a preparation method thereof, and relates to the technical field of shielding materials, which comprises a boron-tungsten compound, wherein the boron-tungsten compound particles are dispersed in a stainless steel matrix. The tungsten-boron stainless steel composite material has high density of the dispersed boron-tungsten compound, tungsten is a heavy metal element with stable chemical properties and high gamma shielding efficiency; boron has a high neutron absorption cross section for medium and low energy neutrons, and is a high-efficiency neutron shielding component; the tungsten boride materials of various components have good compatibility with the stainless steel; at the sintering and other hot working temperatures of the stainless steel, the tungsten boride materials do not react with the stainless steel matrix; the boron-tungsten compound is dispersed in the stainless steel matrix, and the composite material prepared by the method has better neutron shielding performance and gamma shielding performance than traditional boron stainless steel.

Manufacturing process for tungsten-doped cobalt tetroxide, comprising the following steps: S1: Dissolving a tungsten-containing compound and a molybdenum-containing compound in an alkaline liquid to obtain a mixed solution; S2: simultaneous addition of the mixed solution, a cobalt salt solution and a complexing agent to an alkaline solution to react until a reaction material reaches a target particle size; followed by aging and carrying out a solid-liquid separation (SLS) to obtain a precipitation, wherein the alkaline solution comprises the mixed solution and ammonia water; S3: Roasting the precipitate in an oxygenated atmosphere to obtain a roasted material; and S4: Soaking the roasted material in a sodium sulfide solution, adjusting the pH of the solution to 7.2 to 8.5, and performing SLS to obtain the tungsten-doped cobalt tetroxide.

A thermally conductive particle containing at least an aluminum raw material, a zinc raw material, and a fired product obtained by firing other raw materials than the aluminum raw material and the zinc raw material, the content of the zinc raw material being 25-70 parts by mass (inclusive) per 100 parts by mass of the aluminum raw material, and the content of the zinc raw material being 70-90 parts by mass (inclusive) per 100 parts by mass of the aluminum raw material. The other raw material contains at least one compound selected from the group consisting of a boron compound, a tungsten compound, a titanium compound, a bismuth compound and a fluorine compound, the content of the other raw material is 0.05-20 parts by mass per 100 parts by mass of the aluminum raw material, and predetermined conditions are satisfied.

The invention provides a modified evaporation boat and a preparation method thereof, and belongs to the technical field of evaporation boats, the modified evaporation boat comprises a boat body and a modified layer, the boat body is provided with an evaporation tank, and the modified layer is laid at the bottom of the evaporation tank; wherein the raw material of the modified layer comprises a tungsten compound. The preparation method of the modified evaporation boat comprises the following steps: preparing modified slurry containing a tungsten compound; and coating the modified slurry at the bottom of an evaporation tank of a boat body, and drying to form a modified layer, thereby obtaining the modified evaporation boat. According to the modified evaporation boat provided by the embodiment of the invention, the molten liquid can be effectively spread and can be stably evaporated for a long time, so that the performance and the appearance of an evaporation product can be improved.

A lithium secondary battery according to an embodiment of the present invention comprises: a positive electrode containing a first positive electrode active material; the first positive electrode active material includes a lithium-nickel metal oxide particle and a coating layer disposed on a surface of the lithium-nickel metal oxide particle and including at least one selected from the group consisting of a lithium-phosphorus-containing compound, a lithium-sulfur-containing compound, a lithium-tungsten-containing compound, and a lithium-aluminum-containing compound, and the negative electrode includes a silicon-based active material. The lithium secondary battery according to the present invention can improve high-temperature life characteristics and fast charge / discharge life characteristics, and can reduce the amount of gas generated in the battery.

Product containing, on its surface and / or in its core, an additive selected from: - phosphorus compounds other than glasses and glass-ceramics, - tungsten compounds other than glasses and glass-ceramics, molybdenum compounds other than glasses and glass-ceramics, - iron in metallic form, aluminum in metallic form, silicon in metallic form, and mixtures thereof, silicon carbide, - boron carbide, silicon nitride, boron nitride, - glasses containing phosphorus and / or iron and / or tungsten and / or molybdenum, - glass-ceramics containing phosphorus and / or iron and / or tungsten and / or molybdenum, - and mixtures thereof, and having, excluding the additive, the following chemical analysis, in mass percentages based on oxides: - Cr2O3 - 2%, and - Cr2O3 + Al2O3 + CaO + ZrO2 + MgO + Fe2O3 + SiO2 + TiO2 ≥ 90%, and - Cr2O3 + Al2O3 + MgO ≥ 60%.

The positive electrode active material for a lithium secondary battery according to embodiments of the present invention comprises lithium-nickel metal oxide particles, wherein the lithium-nickel metal oxide particles have the form of secondary particles in which a plurality of primary particles are aggregated, and wherein the lithium-nickel metal oxide particles comprise a tungsten compound at the interface between the primary particles, and the tungsten content measured by energy-dispersive X-ray spectroscopy (EDS) satisfies Equation 1, thereby increasing the surface stability of the positive electrode active material and improving high-temperature performance.

This agricultural heat-shielding film comprises: an intermediate layer 2 that contains first resin; an outer layer 3 that contains second resin and is provided on one surface of the intermediate layer 2; and an inner layer 4 that contains third resin and is provided on the other surface of the intermediate layer 2. Endothermic material 5 containing a tungsten-containing compound is dispersed in the outer layer 3 and the inner layer 4.

Process for the preparation of ethylene glycol and / or propylene glycol by reacting a carbohydrate source with hydrogen in the presence of tungsten compound and a heterogeneous catalyst comprising a metal of groups 8, 9 and 10 on a support which heterogeneous catalyst has (a) an active metal surface area (AMSA) of from 4.0 to 8.0 m2 / g, as determined by hydrogen chemisorption, and (b) a ratio of the percentage of the adsorbed ammonia that is desorbed at a temperature range of 100° C. to the temperature of the first peak(%⁢ DA⁢100-FP)⁢ to⁢ the⁢ AMSA⁢ (%⁢ DA⁢100-FP / AMSA)⁢ of⁢ from 0.35 to 8.,and⁢ (c) 7.18×AMSA-%⁢(DA⁢100-FP)AMSAis at least 26.38, and process of selecting such heterogeneous catalyst.

A cathode active material for a lithium secondary battery according to embodiments of the present invention includes lithium-nickel metal oxide particles. The lithium-nickel metal oxide particles have the form of secondary particles in which a plurality of primary particles are agglomerated, and include a tungsten compound at interfaces between the primary particles. When the content of tungsten measured by energy-dispersive X-ray spectroscopy (EDS) satisfies Equation 1, surface stability of the cathode active material is increased, thereby improving high-temperature performance.

The present application relates to the technical field of lubricating technology and electrical insulation medium technology, and provides a lubricating composition for an electrically driven coupling transmission system and a preparation method and application thereof.The lubricating composition takes poly-alpha-olefin as a main body, is matched with synthetic ester, alkylated naphthalene, ash-free total base number carrier, a sulfur-free and phosphorus-free organic tungsten compound with a tungsten element content of 100-300 ppm and a mole ratio of amine nitrogen to tungsten of 0.5-3.0, functionalized hexagonal boron nitride nanosheet, a sulfur-free and phosphorus-free organic molybdenum compound and demulsification aid.The lubricating composition has low power factor, high breakdown voltage and high volume resistivity under the conditions of low ash, low sulfur, low phosphorus and prohibition of ZDDP and 1,3,4-thiadiazole, and the 10 mu m filtration one-pass rate is not less than 98% under the condition of a water content of 300+ / -30 mg / kg, and is suitable for an integrated electric drive system of a motor, a gear and a bearing.

The present disclosure can bring excellent output characteristics to a nonaqueous electrolyte secondary battery that uses a cathode active material containing tungsten while desired durability is secured. The battery of the present disclosure includes a cathode, an anode, and a nonaqueous electrolyte. The cathode includes a cathode active material layer that contains a granular cathode active material. The cathode active material includes a core part that contains a lithium-transition metal composite oxide of a layered structure; a tungsten-concentrated layer that is formed over a surface of the core part and has a higher tungsten concentration than in the core part; and a lithium-tungsten compound particle that adheres to at least part of a surface of the tungsten-concentrated layer and contains tungsten and lithium. In the battery of the present disclosure, the tungsten-concentrated layer has an amorphous structure. This can bring excellent output characteristics while desired durability is secured.

The invention relates to the technical field of biological medicine. The invention discloses a preparation method and application of a nano material capable of improving tumor radiotherapy sensitivity. The preparation method comprises the following steps: S1, dissolving a tungsten compound and a copper compound in an organic solvent in proportion to prepare a mixed solution; s2, transferring to a reaction kettle, adding a surfactant or a polymer, and reacting at a certain temperature to form a rod-shaped initial nano material; s3, cooling to room temperature, and centrifugally washing to obtain a wet material; and S4, after drying, the Cu-W18O49 nano material is obtained. The Cu-W18O49 nano material disclosed by the invention can be injected through veins or in tumors, and is targeted to tumors by virtue of an EPR effect. When near-infrared light and X-ray are combined for treatment, the photothermal effect temperature rise improves hypoxia, and radiotherapy killing is enhanced. The compound is applicable to triple-negative breast cancer and the like, tumor is inhibited through tungsten secondary electrons, copper ion Fenton-like reaction and photothermal effect, CT or photoacoustic imaging monitoring can be performed, and immune response can be activated when the compound is combined with an immune checkpoint inhibitor.

The invention relates to the field of VOCs oxidation catalysis, and discloses a VOCs oxidation catalyst and a preparation method and application thereof.The method comprises the following steps that 1, a carrier is soaked in a mixed solution containing a palladium source, a vanadium precursor and an auxiliary precursor, and a co-soaked product is obtained; and (2) drying and roasting the co-impregnated product obtained in the step (1) to obtain the VOCs oxidation catalyst, wherein the mixed solution in the step (1) further comprises oxalic acid, and the auxiliary agent precursor is a tungsten-containing compound. The preparation method is simple, the condition controllability is high, and the prepared catalyst has good activity, selectivity and stability on catalytic oxidation of nitrogen-containing VOCs.

The invention provides a synthetic method of a dicarboxylic acid compound, which comprises the following steps: by taking a compound as shown in a formula (1) and / or a formula (2) as a raw material, reacting in the presence of a catalytic system, hydrogen and oxygen to prepare the dicarboxylic acid compound as shown in a formula (3), wherein the formula (1), the formula (2) and the formula (3) are shown in the specification; the catalytic system comprises a first catalyst and a second catalyst, the first catalyst comprises a carrier and an active component loaded on the carrier, the active component is a first metal or an alloy formed by the first metal and a second metal, the first metal is selected from one or more of palladium, platinum, rhodium and iridium, and the second metal is gold and / or tin; the second catalyst is a tungsten-containing compound. According to the synthetic method, the compound shown in the formula (1) and / or the formula (2) can be efficiently converted into the corresponding dicarboxylic acid compound, the reaction path is simple, the product yield is high, the method is more environmentally friendly, and the economical efficiency and sustainability of the process are good.

The application discloses a preparation method of a silicic ether catalyst and application of the silicic ether catalyst in synthesis of silicic ether, and the preparation method comprises the following steps: a) preparation of a tungsten sulfide precursor; and b) preparation of the silicic ether catalyst. The application also provides application of the silicic ether catalyst prepared by any one of the preparation methods in synthesis of silicic ether. The application uses tungsten compounds as a tungsten source and sulfides as a sulfur source, uniformly disperses the tungsten compounds and the sulfides in deionized water, and obtains a tungsten sulfide solution by drying; the tungsten sulfide solution is dried and calcined in a microwave tube furnace to obtain the silicic ether catalyst; and the catalyst can be used in a silane and alcohol dehydrogenation coupling reaction to catalyze preparation of different types of silicic ethers. The application provides a fast and efficient preparation method of the silicic ether catalyst, the synthesized catalyst can catalyze a plurality of silane and alcohol dehydrogenation coupling reactions, the experimental operation is simple, the reaction condition is mild, and the catalyst has potential application value in the catalytic synthesis of silicic ethers.

The invention discloses a preparation method of tantalum-doped barium bismuthate tungstate with an X-ray absorption function. The preparation method comprises the following steps: preparing the following raw materials in molar mass: 0.2 to 0.5 mol of bismuth compound, 0.2 to 0.5 mol of tantalum compound, 0.1 to 0.2 mol of barium salt and 0.1 to 0.2 mol of tungsten compound; the preparation method comprises the following steps: dissolving the raw materials in 500-2000mL of polar solvent, and carrying out hydrothermal reaction; alternately washing the obtained precursor with distilled water and absolute ethyl alcohol to remove impurities, and then carrying out drying treatment; and finally, calcining to finally form the nano powder. The invention provides a preparation method of tantalum-doped barium bismuthate with an X-ray absorption function, solves the problems of a traditional lead-containing protective material, and also has the X-ray absorption function, and the invention also provides an application of the tantalum-doped barium bismuthate with the X-ray absorption function in the X-ray protective material.

Conformally deposited molybdenum films having reduced resistivity and methods of forming the same are disclosed. The methods include converting an amorphous silicon layer to a metal layer by thermally soaking the amorphous silicon layer comprising silicon atoms in the presence of a metal compound selected from the group consisting of a molybdenum compound and a tungsten compound until at least a portion of the silicon atoms in the amorphous silicon layer are replaced by metal atoms selected from the group consisting of molybdenum atoms and tungsten atoms. The methods include conformally depositing a molybdenum film on the metal layer.

The application provides a method for preparing a functionalized triazine covalent organic framework material and application of the functionalized triazine covalent organic framework material in catalysis of cellulose to prepare low-carbon alcohols, and belongs to the fields of new material development and catalysis, and comprises the following steps: using a monomer with at least two nitrile bonds as raw material, using a tungsten salt as a catalyst, and adopting an ionothermal method to perform reaction; after the reaction is completed, water is added to continue the reaction; and then the product is collected to obtain a triazine covalent organic framework material loaded with a tungsten compound, namely the functionalized triazine covalent organic framework material. The WOx / CTFs is prepared in one step, the steps are simple, the reaction condition is relatively mild, the application needs can be met, and the W is tightly loaded on the CTFs. The functionalized covalent triazine framework material prepared in the application can efficiently catalyze the cellulose to prepare low-carbon alcohols.

The invention discloses a cobalt-based small-diameter flux-cored wire for nuclear power and a preparation process of the cobalt-based small-diameter flux-cored wire. The cobalt-based small-diameter flux-cored wire comprises an outer skin and a flux core wrapped in the outer skin. Wherein the outer skin comprises the following components: Fe and Co, and the content of Co is greater than 82 wt%; the filling rate of the flux core in the welding wire is 39-48 wt%; the powder of the flux core comprises the following components in percentage by weight: 0.01-2 wt% of mineral powder; 2-8 wt% of silicon powder or a silicon compound; 0.2 to 4 wt% of electrolytic manganese powder; 60-80 wt% of a compound of metal chromium powder and chromium; 0-35 wt% of metal tungsten powder; 0 to 35 wt% of a tungsten compound; 0 to 20 weight percent of metal molybdenum powder; 0-6 wt% of metal nickel powder and 0-6 wt% of metal cobalt powder, the total percentage being 100%; and the content of Fe in chemical components of deposited metal after welding is less than 3wt%. Under the conditions of the same welded base metal, welding process, heat treatment process, service condition and the like, the Fe content of a surfacing layer near a fusion line can be reduced, so that the tendency of forming intermetallic compounds is reduced, and the phenomena of cracking and falling of the surfacing layer in the service process are improved.