22 results about "Sodium metavanadate" patented technology

The invention discloses a sodium metavanadate-based catalyst activity gradient regulation and regeneration system and method, and relates to the technical field of industrial catalyst regeneration, the sodium metavanadate-based catalyst is of a unique layered structure, the sodium metavanadate-based catalyst comprises an outer layer, a middle layer and an inner layer from the surface to the interior in sequence, and active components and doping elements of all the layers are different; the outer layer is doped with high-content sodium metavanadate and manganese oxide, reactant molecules can be quickly adsorbed and activated in the initial stage of the reaction, the manganese oxide can provide additional active sites, reduce reaction activation energy and promote quick start of the reaction, and the middle layer is doped with a proper amount of sodium metavanadate and cerium oxide, so that the reaction is more stable in the process of the reaction. The cerium oxide can adjust migration and conversion of oxygen species on the surface of the catalyst, optimize the reaction path, improve the selectivity of a target product and reduce side reactions, the inner layer is doped with the low-content sodium metavanadate and tungsten oxide, and the structural stability of the catalyst under high-temperature and long-time reaction is maintained by means of the high stability of the tungsten oxide.

The invention discloses a nickel-vanadium-iron-based self-supporting electrode and a preparation method and application thereof. According to the preparation method, sodium metavanadate and nickel chloride are respectively used as a vanadium source and a nickel source, a sphere-like precursor composed of a sheet structure is synthesized on a foamed nickel substrate through a hydrothermal reaction, anhydrous sodium hypophosphite and ferric nitrate are used as a phosphorus source and an iron source, and the NiO-VO-FeP-coated NF self-supporting electrode is finally formed through phosphating treatment and soaking treatment. According to the electrode obtained by the invention, an adhesive does not need to be added, the preparation process is simplified, the production cost is reduced, the catalytic material is tightly combined with the substrate, the catalyst is prevented from falling off, and the seamless contact provides conditions for rapid transfer of charges, so that the activity of the catalyst is obviously improved. The electrode obtained by the invention has excellent oxygen evolution reaction activity and stability, the oxygen evolution reaction activity of the electrode exceeds that of a commercial RuO2 electrode under high current density, and the electrode shows a good industrial application prospect.

A method for preparing vanadium pentoxide by using ammonium metavanadate, comprising the following steps: (1) preparation of an oxidant loaded with ozone and chloromethyl polystyrene resin of graphene oxide; (2) heating and dissolving crude ammonium metavanadate in water, adjusting the pH value to 8-9 by using a sodium hydroxide solution after dissolving, filtering to obtain a sodium metavanadate solution; (3) heating the sodium metavanadate solution to 60-80 DEG C, adding the oxidant loaded with ozone and chloromethyl polystyrene resin of graphene oxide, stirring for more than 20 minutes, filtering to obtain a filtrate; (4) adding ammonium metavanadate crystals to the obtained filtrate for recrystallization, obtaining ammonium metavanadate precipitate, and performing solid-liquid separation and drying to obtain ammonium metavanadate crystals; (5) calcining the ammonium metavanadate crystals to obtain vanadium pentoxide. The purity of the obtained vanadium pentoxide is greater than or equal to 99.99%, and the sum of the content of tetravalent vanadium and trivalent vanadium is less than or equal to 0.003%.

The invention discloses a catalyst for preparing N-(1-ethyl propyl)-3, 4-dimethylaniline through continuous catalytic hydrogenation and a preparation method and application thereof, the catalyst comprises a carrier, and an active component platinum and an auxiliary component which are loaded on the carrier, the auxiliary component is at least one of sodium citrate, disodium ethylene diamine tetraacetate, sodium metavanadate, oxalic acid, zirconium oxychloride, yttrium nitrate or sodium carbonate; and the active component and the auxiliary component both account for 0.1-10% of the mass of the catalyst. The catalyst is used for preparing N-(1-ethyl propyl)-3, 4-dimethylaniline through hydrogenation, the reaction can be continuous, the safety performance is better, and the catalyst has high catalytic activity and stability.

The invention belongs to the technical field of metal material micro analysis / welding processes, and particularly relates to an in-situ imaging method for the three-dimensional morphology of small-size inclusions of weld metal. According to the method, a weld metal sample is sequentially subjected to annealing, grinding and polishing, electrolysis and scanning electron microscope sample preparation, and an observable sample is obtained; wherein an organic electrolyte used for electrolysis is prepared from the following components in percentage by mass: 0.9 percent to 1.1 percent of tetramethylammonium chloride, 0.3 percent to 0.8 percent of triethanolamine, 8 percent to 12 percent of acetylacetone, 4 percent to 6 percent of glycerol, 0.4 percent to 0.8 percent of diphenylguanidine, 0.2 percent to 0.4 percent of triphenylphosphine oxide, 0.08 percent to 0.15 percent of sodium metavanadate and the balance of absolute methanol. According to the method, the three-dimensional morphology of the inclusions in the weld metal can be developed in situ.

The scheme provides a cleavage method of low molecular weight aldehyde carboxyl rubber, which comprises the following steps: dissolving rubber in an organic solvent to obtain a rubber solution; heating the rubber solution, adding sodium metavanadate solution and mixing uniformly to obtain a mixed solution; adding hydrogen peroxide drop by drop into the mixed solution until the cleavage reaction is completed to obtain a reaction solution, wherein the molar ratio of the total amount of hydrogen peroxide to the carbon-carbon double bond in the rubber is (1.2-2.5):1; and treating the reaction solution to obtain low molecular weight aldehyde carboxyl rubber. The method can reduce the cost, improve the environmental protection, significantly improve the functional group content and reaction efficiency of the product, and provide a better choice for the large-scale production and application of low molecular weight aldehyde carboxyl rubber.

The invention belongs to the field of vanadium chemical industry, and particularly discloses a method for preparing anhydrous sodium metavanadate by using sodium vanadium solution. The method comprises the following steps: S1, removing silicon, chromium and aluminum from the sodium modified vanadium liquid to obtain an impurity-removed liquid; s2, concentrating the impurity-removed solution to obtain a concentrated solution; s3, putting the concentrated solution into crystallization equipment, and carrying out standing crystallization at the temperature of 10-30 DEG C to obtain anhydrous sodium metavanadate crystals and post-crystallization liquid; and S4, washing and drying the anhydrous sodium metavanadate crystal to obtain the anhydrous sodium metavanadate. According to the method disclosed by the invention, the anhydrous sodium metavanadate is prepared by taking the sodium vanadium solution as a raw material through impurity removal, concentration, crystallization, washing and drying. According to the method, the anhydrous sodium metavanadate can be prepared at low cost, the purity of the prepared anhydrous sodium metavanadate product is high, the technological process is simple, operation is easy, and the requirement for equipment is low.

This invention relates to the field of galvanized steel technology, and proposes a scratch-resistant galvanized steel strip and its preparation method. The scratch-resistant galvanized steel strip comprises, from bottom to top, a steel strip, a hot-dip galvanized layer, and a passivation layer. During the preparation of the passivation layer, each 1L of passivation solution includes the following components: 5-10g sodium molybdate, 1-2g sodium nitrate, 0.1-0.3g sodium metavanadate, 0.5-0.8g titanylfluoride, and 0.2-0.5g bis(1,6-hexanetriamine)pentamethylenephosphonic acid. This technical solution solves the problems of poor scratch resistance and low surface hardness of existing galvanized steel strips.

This application discloses a method for producing acetonitrile by reacting acetate with ammonia, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and vanadate and alkali metal oxide of active components supported on the surface of the support; the vanadate is selected from at least one of bismuth vanadate, silver metavanadate, ammonium metavanadate, lithium vanadate, lithium metavanadate, sodium vanadate, sodium metavanadate, potassium vanadate, and potassium metavanadate; the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; the support is selected from at least one of silicon oxide, alumina, and molecular sieve; the mass content of vanadate is 0.1–10 wt%, and the mass content of alkali metal oxide is 0.01–5 wt%.

The invention provides a cracking method of medium-low molecular weight aldehyde-terminated carboxyl rubber. The cracking method comprises the following steps: dissolving rubber by adopting an organic solvent to obtain a rubber solution; heating the glue solution, adding a sodium metavanadate solution, and uniformly mixing to obtain a mixed solution; dropwise adding hydrogen peroxide into the mixed solution until the cracking reaction is finished to obtain a reaction solution, wherein the molar ratio of the total usage amount of the hydrogen peroxide to the carbon-carbon double bond in the rubber is (1.2-2.5): 1; the method has the advantages that the cost is reduced, the environmental protection property is improved, the functional group content and the reaction efficiency of the product are obviously improved, and a better choice is provided for the large-scale production and application of the medium-low molecular weight aldehyde-terminated carboxyl rubber.

The application provides a method for co-extracting vanadium and chromium from high-chromium vanadium slag and application thereof. The method comprises the following steps: roasting high-chromium vanadium slag and calcium salt to obtain roasted clinker, leaching the roasted clinker with a leaching agent to obtain a leaching solution, cooling the leaching solution to obtain sodium orthovanadate and a crystallization mother liquor; adding calcium oxide to the crystallization mother liquor to obtain a chromium-containing solution, performing first reduction on the chromium-containing solution to obtain chromium hydroxide, and performing first calcination on the chromium hydroxide to obtain chromium trioxide; mixing the sodium orthovanadate, water and carbon dioxide to obtain sodium metavanadate, sequentially performing transformation and second reduction on the sodium metavanadate, and performing second calcination to obtain a reduction clinker; mixing the reduction clinker, washing water and sodium bicarbonate mother liquor to obtain a sodium-containing solution and primary vanadium trioxide, and washing the primary vanadium trioxide to obtain vanadium trioxide. The application realizes high-value conversion of high-chromium vanadium slag, and simultaneously considers simplicity and economy, and no high ammonia nitrogen, high salt water and ammonia-containing waste gas are generated.

The application provides a vanadium slag cleaning vanadium extraction method and application thereof. The method comprises the following steps: mixing vanadium slag and sodium salt, sintering, adding roasting clinker, water, chromium removal mother liquor and impurity removal slag, leaching to obtain tailings and leaching liquor, removing impurities from the leaching liquor to obtain purified liquor, performing precipitation treatment on the purified liquor to obtain vanadium precipitation mother liquor and calcium vanadate; adding a first reducing agent to the vanadium precipitation mother liquor to obtain chromium hydroxide, calcining to obtain chromium sesquioxide; performing vanadium leaching on the calcium vanadate, carbon dioxide, crystallization mother liquor and calcination tail gas to obtain calcium salt and sodium vanadate solution, evaporating and crystallizing the sodium vanadate solution to obtain sodium metavanadate, performing high-temperature reduction on the sodium metavanadate, an auxiliary agent and a second reducing agent to obtain reduced clinker, and performing sodium removal on the reduced clinker, sodium bicarbonate mother liquor and water to obtain vanadium sesquioxide. The application successfully prepares chromium sesquioxide and vanadium sesquioxide products, and realizes high-value utilization of high-chromium vanadium slag.

The invention provides a composite sodium vanadium phosphate material and a preparation method thereof, a positive pole piece and a secondary battery, and relates to the technical field of sodium ion batteries. The preparation method of the composite sodium vanadium phosphate material comprises the following steps: mixing sodium metavanadate, sodium dihydrogen phosphate, phosphorous acid and an inorganic carbon source, and carrying out dispersion treatment to obtain a dispersed material; in an inert atmosphere, the dispersed material is subjected to segmented calcination, and a composite sodium vanadium phosphate material is obtained; the step-by-step calcination sequentially comprises first calcination and second calcination, the calcination temperature of the first calcination is 120-200 DEG C, and the calcination temperature of the second calcination is 600-650 DEG C. According to the preparation method, phosphorous acid with reducibility, sodium metavanadate with oxidability, sodium dihydrogen phosphate and an inorganic carbon source are mixed by a dry method, and a segmented calcination process is adopted, so that the composite sodium vanadium phosphate material with relatively high compaction density, relatively low powder internal resistance and relatively good electrochemical performance is prepared.

The invention belongs to the technical field of organic synthesis, and particularly discloses a composite catalyst and a preparation method and application thereof in synthesis of 4-cyanopyridine, the composite catalyst comprises the following components by weight: 8-10% of an active component, 1-2% of a promoter, 88-90% of a carrier, and 0.5-1% of a performance regulator; the active component is a vanadium source and comprises ammonium metavanadate, vanadium pentoxide and sodium metavanadate; the promoter is a cerium source and comprises cerium nitrate, cerium oxide and cerium oxalate; the carrier is a titanium source and comprises titanium dioxide, tetrabutyl titanate, titanyl sulfate and isopropyl titanate; the performance regulator is graphene quantum dots. According to the composite catalyst and the preparation method thereof, the composite catalyst is applied to the synthesis process of 4-cyanopyridine, a target product can be efficiently prepared in a high-selectivity and low-energy-consumption mode, and then the composite catalyst has the practical value and application potential of industrial continuous production.

The invention belongs to the technical field of electro-catalytic materials, and particularly relates to a preparation method and application of a vanadium-doped cobalt phosphide heterogeneous composite material. The preparation method comprises the following steps: firstly, growing a ZIF-67 precursor on carbon cloth by an impregnation method to obtain ZIF-67 / CC; then, the ZIF-67 / CC is soaked in a sodium metavanadate solution for etching, and a Co3V2O8 / CC intermediate is formed; the vanadium-doped cobalt phosphide heterogeneous composite material has excellent electro-catalysis oxygen evolution performance and good full water decomposition performance under the alkaline condition, shows excellent conductivity and good stability, can be used as an excellent catalyst for electro-catalysis oxygen evolution reaction, and has good application prospects. The preparation method has certain practical application potential, and is simple, short in process and convenient for commercial popularization.

This invention discloses a water-based fast-drying anti-rust paint and its preparation process and method. The paint comprises a core-shell acrylic emulsion, an acrylic phosphate emulsion, a nano-composite zinc phosphomolybdate, nano-graphene, a phytic acid-modified silicon quantum dot composite, sodium metavanadate, and additives. It has excellent long-lasting anti-corrosion, fast-drying application, and environmental friendliness, and is particularly suitable for rust prevention and protection of steel substrates in high-chlorine corrosion environments such as marine environments.

The application discloses a method for preparing high-purity sodium metavanadate, which comprises the following steps: (1) preparing a sodium hydroxide solution by taking sodium hydroxide and water; (2) adding vanadium pentoxide into the sodium hydroxide solution to dissolve, obtaining a first mixed solution, and then performing first temperature rising and first stirring; (3) adjusting the PH value of the first mixed solution to 8.5-10 by adding vanadium pentoxide or sodium hydroxide, obtaining a second mixed solution, and then performing second temperature rising and second stirring; (4) filtering the second mixed solution at a certain temperature, adding a flocculating agent into the filtrate, obtaining a third mixed solution, and then performing first temperature falling and third stirring; and (5) filtering the third mixed solution, allowing the filtrate to be static crystallization, drying the crystals to obtain sodium metavanadate, and the obtained filtrate can be reused. The method can prepare high-purity sodium metavanadate, and the produced wastewater solution can be recycled.

The invention discloses a macroporous ZSM-5 molecular sieve loaded heteropolyacid desulfurization catalyst as well as preparation and application thereof, and belongs to the technical field of light fuel oil desulfurization. The method comprises the following steps: adding sodium metavanadate dihydrate, sodium dihydrogen phosphate hydrate and sodium molybdate dihydrate as raw materials into an aqueous solution, adjusting the pH value to about 4, refluxing for 8 hours, cooling, extracting with diethyl ether to obtain vanadium-substituted Dawson type heteropolyacid, and adjusting the material ratio to obtain different amounts of vanadium-substituted heteropolyacid. Then, the supported catalyst POM-CNTs (at) MOF-199-ZSM-5 is prepared through a one-pot method, and the obtained catalyst is applied to oxidative desulfurization of a light fuel simulation system. Oxygen in air is used as an oxidizing agent, and the thiophene removal rate can reach 98.90% after 2.5 h at 70 DEG C.

The invention relates to the technical field of energy-saving glass, in particular to self-cleaning heat-reflecting coated glass and a preparation method thereof. The invention relates to a preparation method of self-cleaning heat-reflecting coated glass. The preparation method comprises the following steps: preparing modified silicon dioxide sol, preparing hydrophobic modified coating liquid, preparing titanium-doped powder and preparing the self-cleaning heat-reflecting coated glass. The preparation method comprises the following steps: respectively dissolving bismuth nitrate pentahydrate and sodium metavanadate, mixing and reacting to generate a precipitate, mixing a precipitate dispersion liquid with an absolute ethyl alcohol solution of tetrabutyl titanate, drying and calcining to prepare titanium-doped powder; the preparation method comprises the following steps: firstly preparing a silicon dioxide film layer on the surface of a glass substrate, then preparing a doped tin dioxide film layer on the surface of the glass substrate coated with the silicon dioxide film layer, then preparing the titanium-doped powder into a coating target material, and depositing on the surface of the doped tin dioxide film layer, so that the heat reflection capability of the coated glass can be synergistically enhanced by compounding the titanium-doped powder and the doped tin dioxide film layer, the heat penetrating through the glass is obviously reduced, and the energy consumption is reduced.

The application discloses a rare earth neodymium-containing polyoxometalate and a preparation method and application thereof, and relates to the technical field of water treatment. The rare earth neodymium-containing polyoxometalate K 15 Nd(GeW 10 VO 39 )2.nH2O is synthesized by taking germanium dioxide, sodium metavanadate, potassium chloride, neodymium nitrate and other reagents as raw materials. The rare earth neodymium-containing polyoxometalate prepared in the application has a remarkable degradation effect on active red X3B, and the degradation rate of the active red X3B reaches 99.94% after ultraviolet light irradiation for 40 min.

This invention provides a method for the resource-based regeneration of waste tungsten based on low-temperature catalytic leaching, belonging to the technical field of waste tungsten resource recycling. The method includes: collecting tungsten waste, pre-treating it to obtain tungsten particles; adding a leaching agent and catalyst to the tungsten particles for low-temperature catalytic leaching, collecting the tungsten leachate after solid-liquid separation; adding oxalic acid to adjust the pH to 2.5-4.0, allowing it to stand to remove silicon and phosphorus, then adding sodium sulfide solution to remove heavy metals, obtaining a pure tungsten solution after solid-liquid separation; preparing ammonium paratungstate or tungsten trioxide from the pure tungsten solution; and performing staged reduction heat treatment to obtain regenerated tungsten powder. The leaching agent is a mixture of sodium hydroxide and hydrogen peroxide; the catalyst is a mixture of sodium metavanadate and sodium carbonate. This invention covers the entire process of tungsten waste recycling, pre-treatment, leaching, purification, product preparation, and waste recycling, with each link working synergistically to form a closed-loop industrial chain, maximizing the utilization of waste tungsten resources and avoiding resource waste.

The invention relates to a method for separating aluminum and vanadium in a sodium metaaluminate solution. According to the technical scheme, the method comprises the following steps: preheating a sodium metaaluminate solution to a certain temperature, and adding a pH regulator into the sodium metaaluminate solution; adjusting the pH value, carrying out solid-liquid separation, adding clear water into the filter cake, uniformly stirring, adding a certain amount of vanadium removal agent, carrying out hydrothermal aging under certain conditions, and carrying out solid-liquid separation on the slurry after hydrothermal aging to obtain a hydrated alumina filter cake; washing and drying the hydrated alumina filter cake to obtain an aluminum product; the filtrate is a sodium metavanadate solution. The method has the characteristics of simple process and good aluminum-vanadium separation effect, the content of V2O5 in the aluminum product is less than or equal to 0.02%, and the vanadium separation rate is more than 99.75%.