24 results about "Tungsten Compounds" patented technology

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 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 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.

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 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 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.

The present application belongs to the technical field of solid waste resource utilization and process closed loop in hydrometallurgy, and specifically discloses a method for efficiently recovering tungsten from alkali leaching tungsten slag. The tungsten slag is first pretreated by grinding through a ball mill, the obtained pretreated slag is subjected to leaching operation, and then the obtained leaching solution is subjected to cyclic pressure boiling. By optimizing pressure boiling parameters such as alkali concentration, temperature and pressure, the insoluble tungsten compounds in the tungsten slag are directionally dissolved, and the tungsten concentration is gradually enriched to match the main process indicators. No additional evaporation and concentration or purification equipment is needed, the industrialization modification difficulty is low, the existing main process equipment can be directly reused, the tungsten recovery rate is high, the main process is well connected, the alkali solution for pressure boiling is recycled, not only the reagent is saved, but also a large amount of alkali-containing wastewater is avoided, which is environmentally friendly and economical. The tungsten recovery rate is greater than or equal to 95% by using the method, the utilization rate of the material liquid is greater than or equal to 90%, solid waste resource utilization and material liquid closed loop utilization are realized, and the method is suitable for industrialization and popularization.

The present application discloses a method for preparing vicinal diols by olefin oxidation, which comprises contacting an olefin, an oxidant, an acid and a solvent with a composite catalyst to obtain a product containing vicinal diols, wherein the composite catalyst comprises a titanium silicalite and a tungsten-containing compound. The method has the characteristics of mild reaction conditions, simple operation process, high raw material conversion rate, high vicinal diol selectivity and high utilization rate of hydrogen peroxide.

The present disclosure discloses a preparation method of tungsten-doped cobalt tetraoxide and use thereof. The preparation method includes the following steps: dissolving a tungsten-containing compound and a molybdenum-containing compound in an alkali liquid to obtain a mixed solution; concurrently feeding the mixed solution, a cobalt salt solution, and a complexing agent into a base solution to allow a reaction to obtain a precipitate; roasting the precipitate in an oxygen-containing atmosphere to obtain a roasted material; and soaking the roasted material in a sodium sulfide solution to obtain the tungsten-doped cobalt tetraoxide. In the present disclosure, tungsten is doped, and tungsten has a large atomic radius, which stabilizes an internal structure of the material, expands the ion channel, and improves the cycling performance of the material; and molybdenum is removed through a soaking process, which provides atomic vacancies to further improve a specific capacity of the material.

The invention belongs to the technical field of fine chemical synthesis, and particularly relates to a 1, 4-BAC fixed bed catalyst and a preparation method thereof. The cesium-containing compound, the cerium-containing compound and the tungsten-containing compound are used as raw materials to prepare the 1, 4-BAC catalyst containing various metal elements, and the 1, 4-BAC catalyst with high selectivity and high catalytic activity is prepared by adjusting the types of metals in the catalyst and the preparation process, so that the synthesis efficiency of preparing 1, 4-BAC from 1, 4-cyclohexanedimethanol (CHDM) is improved. The catalyst provided by the invention has the advantages of uniform components, good dispersion among metals, strong controllability of the catalyst structure, and accurate regulation and control of the crystal form, the particle size and the pore structure. According to the present invention, with the catalyst, the production process condition of 1, 4-BAC is mild, the original high pressure reaction in the process is adjusted to the medium pressure reaction, the harsh degree of the reaction condition is reduced, the safety coefficient of the process is increased, and the continuous production is provided by the synthesis method so as to improve the productivity.

A catheter tip is configured so that the catheter tip is unlikely to deteriorate even after long-term storage. The catheter tip includes: a resin having an ester bond and / or an amide bond; a tungsten-containing compound; and a hydrolysis inhibitor.

A process for recovering and regenerating a tungsten compound suitable as co-catalyst in converting carbohydrates with hydrogen into alkylene glycols and polyols, from ash comprising one or more tungsten-oxygen components (e.g. comprising a tungstate and / or tungstic acid). Such ash is obtainable from burning a liquid mixture comprising alkylene glycols and / or polyols and sodium tungstate and / or tungstic acid.

To provide a coating liquid for a positive electrode active material capable of uniformly forming a coating film on a surface of the positive electrode active material, suppressing a reaction between the positive electrode active material of a positive electrode member and a solid electrolyte layer, and constituting an all-solid-state lithium ion secondary battery having stable battery performance, and to provide a method of manufacturing the positive electrode active material with the coating film.SOLUTION: A coating liquid for a positive electrode active material, which is used for forming a coating layer 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, a tungsten compound, and ammonia, wherein an ammonia concentration is in a range of 0. 7mol / L or more and 3. 9mol / 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

This invention belongs to the field of luminescent materials technology, and discloses a europium-doped tungstate red fluorescent material, its preparation, and its application. The chemical formula of the fluorescent material is: Ca2La 18‑x W8O 53 :xEu 3+ 0.10≤x≤0.50. The preparation method includes the following steps: Raw materials are weighed according to their chemical formulas and stoichiometric ratios: calcium-containing compounds, lanthanum-containing compounds, tungsten-containing compounds, and europium-containing compounds; the weighed raw materials are thoroughly ground and then placed in a muffle furnace for high-temperature calcination in air to obtain the desired red fluorescent material. Under ultraviolet or blue light excitation, the phosphor emits bright red light. This fluorescent material has high chromatic purity, low correlated color temperature, and high emission intensity. The preparation process is a one-step synthesis method, which is simple, pollution-free, energy-saving, and environmentally friendly, enabling large-scale industrial production.