80results about "Molybdenum oxides/hydroxides" patented technology

The invention discloses a molybdenum oxide nanorod material, a preparation method of the molybdenum oxide nanorod material and application of the molybdenum oxide nanorod material to improvement of corn nutrient utilization, growth promotion and lodging resistance, and belongs to the technical field of corn nutrient utilization and agricultural nano material application. The morphology and dispersity of the nanorod are optimized by combining molecular composition characteristics of key enzymes (such as nitrate reductase and glutamine synthetase) in a corn nutrient utilization process, and finally the functional nanorod with targeting property and biocompatibility is obtained and can be widely applied to nutrient regulation and control scenes of corn water culture and field planting. After the material is applied, the activity of nitrate reductase and glutamine synthetase of a corn root system can be activated in a targeted manner, the nutrient utilization efficiency is accurately improved, and sufficient nutrition support is provided for plant growth. After the fertilizer is applied to plants, the root system is promoted to be developed, the stalks are thick and strong, the lodging resistance is remarkably enhanced, the protein content of the plants and grains can be increased, and the synergistic effects of efficient nutrient utilization, robust plant growth, lodging resistance and yield increase are achieved.

A process produces high-purity vanadium chemicals from vanadium raw materials having high molybdenum contents. Molybdenum is selectively precipitated via vanadium from alkaline vanadate solutions using the following process steps: providing a molybdenum-containing alkaline vanadate solution, adding calcium hydroxide as a precipitant in portions while keeping the pH constant between 6 and 7 using acid, mixing the solution, solid-liquid separation of the resulting suspension, and further processing the low-molybdenum alkaline vanadate solution to produce a high-purity vanadium chemical having a molybdenum content of at most 500 ppm.

The present disclosure addresses the problem of providing a method for producing molybdenum trioxide having a lowered Sb content. A method for producing molybdenum trioxide according to the present invention includes: a step for mixing a raw material constituted of molybdenum compounds or hydrates thereof with chlorine, hydrogen chloride or a chloride; and a step for heating the obtained mixture at a temperature of 70°C or higher. Alternatively, a method for producing molybdenum trioxide according to the present invention includes: a step for mixing ammonium chloride with a raw material constituted of molybdenum trioxide, ammonium molybdate or hydrates of these; and a step for heating the obtained mixture at a temperature of 180ºC or higher.

This invention belongs to the field of aerogel technology, and relates to a silicon-based aerogel composite material, its preparation method, and its application. The preparation method of the silicon-based aerogel composite material is as follows: An active component precursor is added to a solvent and stirred until homogeneous, forming an active component precursor solution; ethanol and acid are added to the silicon-based precursor, stirred until homogeneous, and cooled to room temperature to form a silicon-based precursor solution; the active component precursor solution is added to form a precursor-silica sol mixed solution; an alkaline solution is added and stirred until homogeneous, forming a mixed solution; a stepped hot melt-gel treatment is performed, followed by standing to form a silicon-based composite wet gel; solvent replacement and drying yield silicon; the stepped hot melt-gel reaction includes 2-5 temperature stages, each lasting 10-80 minutes at 50-100°C. This invention employs a controllable stepped hot melt-gel process to obtain a silicon-based aerogel composite material with both high specific surface area and excellent mechanical properties.

To provide a novel graphene monoxide material that can be used in many applications such as electrochemical cells and methods of making the same.SOLUTION: Provided are a composition of graphene-based nanomaterials characterized by at least one area of one atomic layer of graphene monoxide, wherein at least a portion of oxygen molecules present in the graphene monoxide are incorporated into specific crystalline structural moieties, methods of making the same, electrodes in electrochemical devices incorporating the same, and compositions of lithium and graphene monoxide, the compositions containing material that result from cycling the electrodes.SELECTED DRAWING: Figure 1-1

The application relates to the technical field of molybdenum trioxide production, and particularly discloses a preparation method of high-purity molybdenum trioxide. The method comprises the following steps: preparing a complexing impurity removing agent by taking diatomite, citric acid, ethylenediaminetetraacetic acid disodium and tartaric acid as raw materials; dissolving industrial ammonium dimolybdate to obtain an ammonium molybdate solution, adding the impurity removing agent into the ammonium molybdate solution, complexing impurities under an acidic condition, and deeply removing the impurities through flocculation and precision filtration; adjusting the alkalinity of the filtrate, and cooling and crystallizing the filtrate to obtain high-purity ammonium molybdate; and finally performing program-controlled temperature calcination in an atmosphere with a specific oxygen content by using a quartz boat coated with a composite coating on the inner wall, so as to obtain high-purity molybdenum trioxide. The application combines multi-stage purification with an accurate calcination process, can efficiently remove impurities in raw materials, and has stable process flow; the obtained molybdenum trioxide product has high purity, good crystal morphology, good process stability and good industrialization prospect.

A composite product includes molybdenum disulfide particles and palladium particles, in which an average crystallite size of molybdenum disulfide included in the molybdenum disulfide particles determined from a peak of 2θ=14.4°±0.5° obtained by X ray diffraction measurement is 150 nm or less. A catalyst ink includes the composite product and a dispersing medium. A method for producing the composite product includes a step of mixing molybdenum disulfide particles and a palladium solution, in which an average crystallite size of molybdenum disulfide included in the molybdenum disulfide particles determined from a peak of 2θ=14.4°±0.5° obtained by X ray diffraction measurement is 150 nm or less.

This invention provides an ultrafine intermediate molybdenum oxide material and its preparation method. The method involves placing ammonium molybdate in a reaction vessel and heating it in a vacuum environment at 400℃–600℃ for at least 3 hours to obtain the ultrafine intermediate molybdenum oxide material. The reaction vessel is a sealed structure except for the exhaust end, which is equipped with a one-way gas flow valve. The Fisher particle size of the ultrafine intermediate molybdenum oxide material is 0.8–1.0 micrometers. The method uses a reaction vessel equipped with a one-way gas flow valve, preventing external air from entering during the roasting process while simultaneously allowing the exhaust of gases generated during decomposition, thus ensuring the purity of the obtained molybdenum oxide material. The process conditions are simple and easy to control, making it suitable for industrial production. This material, with its small particle size and high purity, has broad application prospects.

This molybdenum trioxide powder has a specific surface area, as measured using the BET method, of 100 mｍ2 / g-500 m2 / g. The molybdenum trioxide powder may have a median diameter D50 of 5-1000 nm, as determined using a dynamic light scattering method. The molybdenum trioxide powder may have a purity of 99 mass% or more. The molybdenum trioxide powder may include molybdenum trioxide having a β crystal structure.

The application provides a molybdenum trioxide extraction method, and belongs to the field of extraction metallurgy. The molybdenum trioxide extraction method provided by the application comprises the following steps: vacuum smelting a molybdenum-containing material to obtain sublimates, and cooling the sublimates to obtain the molybdenum trioxide; the molybdenum content in the molybdenum-containing material is 37.42-46.31 wt%, and the oxygen content is 30.74-38.13 wt%; the temperature of the vacuum smelting is 880-1200 DEG C, and the vacuum degree is 0.47-10 Pa; and the cooling rate of the cooling is 5-10 DEG C / min. The molybdenum trioxide is obtained by decomposing molybdate in the molybdenum-containing material through vacuum smelting, and the original molybdenum trioxide in the molybdenum-containing material sublimates under high-temperature conditions to obtain high-purity molybdenum trioxide, thereby effectively improving the extraction efficiency of the molybdenum trioxide; and the extraction method is simple, the low-grade molybdenum-containing material is used as the raw material, the extraction cost is lower, and the environment is not polluted.

A molybdenum trioxide powder, which contains an aggregate of primary particles comprising a crystal structure of molybdenum trioxide, the crystal structure comprising α-crystals having an average crystallite size of 50 nm or less. The median particle diameter D50 of the primary particles, which is obtained by a dynamic light scattering method, is 2000 nm or less. 50 is 2000 nm or less.

A molybdenum trioxide powder contains an aggregate of primary particles having a β crystal structure of molybdenum trioxide. The molybdenum trioxide powder has a MoO3 content ratio of 99.6% or more measured by X-ray fluorescence (XRF), and has an average particle diameter of the primary particles of 1 μm or less. A method for producing the above molybdenum trioxide powder includes vaporizing a molybdenum oxide precursor compound to form molybdenum trioxide vapor, and cooling the molybdenum trioxide vapor.

This invention discloses a method for preparing a nano-zinc sulfide composite material, comprising: (1) dissolving ammonium molybdate in deionized water, stirring evenly to form a 50 g / L solution, then sequentially adding zinc acetate and thiourea, wherein the mass ratio of ammonium molybdate to zinc acetate and thiourea is 2:1, and stirring thoroughly to obtain a mixed solution; (2) transferring the obtained mixed solution to a reaction vessel, reacting at a constant temperature of 160℃ for 12 h, and obtaining a solid powder after treatment; (3) heat-treating at 300-400℃ for 2 h to obtain the nano-zinc sulfide composite material. This invention synthesizes zinc sulfide nanomaterials with different sizes and morphologies, while molybdenum dioxide nanoparticles modify the surface of zinc sulfide. The two work synergistically to have heterogeneous structural characteristics that promote and accelerate electron transport. Using them as electrode materials for electrochemical detection of nicotine and the metabolite cotinine content in cigarettes shows potential application advantages.

The invention relates to the technical field of metal materials, in particular to a preparation method of high-temperature-resistant memory metal for a temperature control device, which specifically comprises the following steps: S1, raw material smelting, S2, ingot casting pretreatment, S3, molding processing, S4, heat treatment and S5, surface treatment. According to the preparation method, the prepared nanorod composite material is added into the raw materials of the memory metal, the nanorod composite material can be used for pinning a grain boundary like a'framework ', preventing grain growth or grain boundary softening at a high temperature and enhancing the stability of a crystal structure, and the nanorod composite material is not easily scattered at the high temperature, so that the reversibility of phase change can be kept, and the mechanical property can be maintained; and the nanorod composite materials can be mutually connected through the fiber net-shaped structure coated on the surface, so that a continuous-phase nanorod layer is formed, the effect of isolating oxygen can be achieved, internal metal is prevented from being further oxidized and corroded, performance stability can still be maintained in a high-temperature environment, and the high-temperature resistance of the memory metal can be effectively improved.

This invention relates to a method for preparing nano metal oxides and its use. The preparation method involves reacting a low-purity initial alloy containing the target metal element M and Al / Zn with a heated concentrated alkaline solution. Under specific reaction conditions, the initial alloy undergoes intense hydrogen evolution and Al / Zn-removal reaction, resulting in nanoscale fragmentation, followed by shape and composition reconstruction to form nano M oxides. Through further post-treatment, crystalline nano M oxides or modified nano M oxides can be obtained. This method is simple, fast, cost-effective, and suitable for large-scale production. It enables the preparation of nano metal oxides with various crystallinities, which have promising applications in fields including composite materials, catalytic materials, ceramic materials, refractory materials, advanced electronic materials, battery materials, chromogenic materials, wave-absorbing materials, wastewater degradation materials, antimicrobial materials, coatings, pigments, thermal spray materials, and sensors.

The invention relates to the technical field of materials, and discloses a modified antibacterial ceramic material and a preparation method thereof.The ceramic material is prepared from potassium feldspar, bentonite, a composite antibacterial agent and the like through the processes of grinding, mixing, aging, standing and defoaming. Wherein the composite antibacterial agent is copper-loaded porous molybdenum oxide of which the surface is coated with a compact cross-linked organic matter layer, pores of the porous molybdenum oxide are blocked after the composite antibacterial agent is coated with the compact cross-linked organic matter layer, copper in the pores can be protected from flowing out in the ball-milling and mixing process with other components, and in the subsequent high-temperature ablation process of ceramic, the corrosion resistance of the composite antibacterial agent is greatly improved. According to the present invention, the organic matter layer has the long-acting antibacterial property, the tamarind gum molecular chain in the organic matter layer can be burnt off, such that the pores of the internal porous molybdenum oxide can be exposed to a certain extent so as to continuously and slowly release the copper in the pores, and the long-acting antibacterial property is provided for the glaze layer in cooperation with the photocatalytic antibacterial effect of the molybdenum oxide, and in addition, the siloxane structure in the organic matter layer can form the silica sol after high temperature ablation so as to achieve the long-acting antibacterial property; and the glaze layer is endowed with good hydrophobic self-cleaning performance.

The invention provides a molybdenum oxide-molybdenum carbide composite catalyst for producing hydrogen by electrolyzing water and a preparation method thereof. The preparation method mainly comprises the following steps: 1) performing hydrothermal reaction on ammonium molybdate and urea to obtain a molybdenum oxide nanobelt; 2) performing low-temperature primary thermal carbonization on the molybdenum oxide nanobelt to obtain a precursor MoOx / C nanobelt; and 3) carrying out secondary microwave carbonization and reduction heat treatment on the precursor MoOx / C nanobelt to prepare the molybdenum oxide-molybdenum carbide composite catalyst. According to the prepared molybdenum oxide-molybdenum carbide composite catalyst, catalytic active sites are remarkably increased, the electronic structure is effectively adjusted, and then the excellent performance of hydrogen evolution through electrolysis of water is shown. The method has the advantages of simple process, low cost, good controllability and the like, is suitable for large-scale popularization and application, and has a wide application prospect in the field of hydrogen production by water electrolysis.

This invention discloses a method for preparing and applying a three-dimensional self-supporting rGO-MoO2-S cathode material. This material is composed of nitrogen-doped rGO, ultrafine MoO2 nanoparticles, and sulfur, exhibiting high specific surface area, porous structure, and excellent electrochemical performance. The preparation method involves dissolving MoCl5 in deionized water, adding ammonia and GO nanosheet dispersion, stirring until homogeneous, and then preparing GO-MoO2 hydrogel via a hydrothermal method. After freeze-drying and high-temperature calcination under a nitrogen atmosphere, a self-supporting rGO-MoO2 aerogel is obtained. Finally, it is composited with sulfur to prepare the rGO-MoO2-S cathode material. As a cathode material for sodium-sulfur batteries, this material can effectively suppress the shuttle effect of NaPSs from both physical encapsulation and chemical adsorption levels, improving battery cycle stability and rate performance. The self-supporting structure eliminates the need for additional binders and conductive additives, further enhancing the actual energy density of the battery. This provides a high-performance cathode material for the large-scale energy storage application of room-temperature sodium-sulfur batteries, which is of great significance.

The present disclosure addresses the problem of providing a method for producing molybdenum trioxide in which the Sb content is reduced. A method for producing molybdenum trioxide comprises a step for mixing a starting material comprising a molybdenum compound or a hydrate thereof with chlorine gas, hydrogen chloride, or a chloride, and a step for heating the resulting mixture at a temperature of 70 DEG C or higher. Furthermore, a method for producing molybdenum trioxide comprises a step for mixing a raw material comprising molybdenum trioxide, ammonium molybdate, or a hydrate thereof with ammonium chloride, and a step for heating the resulting mixture at a temperature of 180 DEG C or higher.

The invention discloses a nanoparticle introduced with a second-phase coherent defect as well as a preparation method and application of the nanoparticle. The Nb14Mo3O44 phase and the Nb12MoO33 phase are included, and a coherent heterostructure is formed between the Nb14Mo3O44 phase and the Nb12MoO33 phase through an atomic-scale matched shear co-boundary interface. The nanoparticles are of a tetragonal system, the space group is C2 / m, and the particle size is 50-200 nm. The preparation method comprises the following steps: forming a precursor solution from a niobium source, a molybdenum source and a ligand in N, N-dimethylformamide or ethanol, carrying out a hydrothermal reaction, and sintering in a protective atmosphere. The nano-particle is used as a lithium ion battery negative electrode material, solves the contradiction that the fast charging performance and the capacity of the traditional niobium-based oxide cannot be obtained at the same time, is suitable for electric automobiles and high-power energy storage equipment, is green and controllable in preparation process, and has a large-scale industrialization prospect.

To provide a method for producing molybdenum trioxide powder that can reduce material costs and decrease the environmental burden and disposal costs associated with the disposal of by-products generated by calcination. [Solution] The manufacturing method comprises: a first calcination step S11 in which a first raw material mixture containing a molybdenum oxide precursor compound and metal compound particles other than the molybdenum compound is placed in a sheath and calcined; a first cooling step S12 to generate molybdenum trioxide powder; a first crushing step S13 to crush the residue containing metal oxides derived from the metal compound particles remaining in the sheath to form first crushed particles; a second calcination step S21 in which a second raw material mixture containing a molybdenum oxide precursor compound and the first crushed particles is placed in a sheath and calcined; a second cooling step S22 to generate molybdenum trioxide powder; and a second crushing step S23 to crush the residue containing metal oxides derived from the first crushed particles remaining in the sheath to form second crushed particles.

The application discloses a molybdenum trioxide material containing oxygen vacancies, which is prepared by a seed layer assisted hydrothermal method, and preparation raw materials include seed liquid and precursor solution; the chemical formula of the molybdenum trioxide material is MoO 3‑x , wherein 0

For treating petrochemical catalysts for the selective extraction of molybdenum therefrom, a plant and a process are proposed for extracting the molybdenum by charging a batch of catalysts to a rotary kiln of which the refractory is heated or preheated to a high temperature, and setting the kiln in rotation so that the catalyst charge undergoes constant renewal of the surface in contact with the superheated refractory. The catalyst charge is brought to temperatures of the order of 1300° C. (1250 to 1350° C.), which allow around 95% of the molybdenum present to sublime.

This invention relates to the field of metal materials technology, specifically to a method for preparing a high-temperature resistant shape memory metal for temperature control devices. The method includes S1 raw material smelting, S2 ingot pretreatment, S3 forming and processing, S4 heat treatment, and S5 surface treatment. In this invention, by adding the prepared nanorod composite material to the shape memory metal raw material, the nanorod composite material acts like a "skeleton" to anchor grain boundaries, preventing grain growth or grain boundary softening at high temperatures, enhancing the stability of the crystal structure, and preventing it from being easily "disintegrated" at high temperatures. This maintains the reversibility of phase transformation and preserves mechanical properties. Furthermore, the nanorod composite materials are interconnected through a surface-coated fibrous network structure, forming a continuous phase nanorod layer that isolates oxygen, preventing further oxidation and corrosion of the internal metal. This ensures stable performance even at high temperatures, effectively improving the high-temperature resistance of the shape memory metal.

Provided is a method for producing molybdenum trioxide fine particles, which is capable of producing molybdenum trioxide fine particles at a high recovery rate, even with low energy consumption, by means of easy ON / OFF control and selective heating. The method for producing molybdenum trioxide fine particles according to the present invention comprises: a gasification step for heating and gasifying molybdenum trioxide by irradiating the molybdenum trioxide with electromagnetic waves; and a granulation step in which the vaporized molybdenum trioxide is cooled in an unheated atmosphere and granulated to obtain molybdenum trioxide microparticles. And the frequency of the electromagnetic wave is in a range of 300 to 30000 MHz.

The invention relates to a method for preparing a patterned molybdenum dioxide thin film through laser induction and a flexible electronic device, and belongs to the technical field of functional material preparation and processing, precursor ink containing molybdenum trioxide nanoparticles, polyvinylpyrrolidone and isopropanol is prepared, a substrate is coated with the precursor ink to form a precursor thin film, and the patterned molybdenum dioxide thin film is prepared. And after drying and curing, carrying out laser direct writing reduction sintering on the precursor film, and reducing and sintering into molybdenum dioxide by utilizing a photothermal effect generated by surface plasmon resonance. The invention aims to overcome the dependence of a traditional process on a high-temperature vacuum environment, and provides a method for efficiently preparing a molybdenum dioxide film with high conductivity and biocompatibility in an environment atmosphere in a patterning manner, and a multifunctional flexible electronic device is constructed based on the film.

The application provides a Mo2C / MoO3 flaky heterostructure gas-sensitive material and a preparation method and application thereof. The application has simple preparation process and low cost. MoO3 nanosheets are obtained by intercalating block MoO3 with organic amine. Mo2C nanosheets are obtained by high-temperature carbonization in an inert atmosphere. The Mo2C nanosheets are annealed in air to obtain the flaky Mo2C / MoO3 heterostructure. Molybdenum carbide has a wide d-orbital structure similar to noble metal Pt, and shows similar catalytic performance to Pt. The catalytic performance is conducive to the sensing reaction, and molybdenum carbide has good conductivity, which is conducive to the electron transfer in the sensing process, thereby improving the gas-sensitive performance of the MoO3 gas-sensitive material to triethylamine. The Mo2C / MoO3 flaky heterostructure gas-sensitive material has ultrahigh response (R a / R g =551,50 ppm,110℃) and excellent repeatability and selectivity to triethylamine, and can be used for high-sensitivity detection of triethylamine.

The application provides a wave-absorbing material and a preparation method thereof, and the method comprises the following steps: (1) uniformly mixing an ammonium molybdate solution with nitric acid, and obtaining alpha-MoO3 powder after reaction; (2) dissolving a reducing agent powder and a metal salt powder in water to obtain a mixed solution, uniformly mixing the alpha-MoO3 powder with the mixed solution, and obtaining the wave-absorbing material after reaction. According to the scheme, the alpha-MoO3 powder is subjected to a hydrothermal reduction reaction with a mixed solution prepared by mixing a reducing agent powder and a metal salt powder, so that metal ions are inserted into the van der Waals layer of molybdenum oxide, the valence of part of molybdenum elements is lowered by replacing van der Waals force with metal ion bonds, and the conductivity and the electrochemical stability of the wave-absorbing material are improved; in addition, the volume expansion of the material caused by the metal ions entering the interlayer of molybdenum oxide endows the wave-absorbing material with a nano effect, and defects such as vacancies are formed on the surface of the material, the polarization loss is enhanced, and finally the wave-absorbing performance of the wave-absorbing material is enhanced.

A meta-stable ferroelectric structure including one of the following oxides: an isovalent combination of the formula MxM′1-xO2-δ, wherein M, M′={Zr, Hf, Pb, W, Mo, Nb, Te, Ti}, 0≤x≤1, 0≤δ≤0.5 excluding {HfxZr1-xO2 all x in Pca21 phase}; an aliovalent combination of the formula MIxMII1-xO2-δ, wherein MI, MII={Bi, Y, Ta, In, Mo, Nb, Sc, Tl, Pd, Sb, W, Cr, Ge, Rh, Ti, Ag, Sn, Au, Ir, Pd, Ni, Ru, Hg}, 0≤x≤1, 0≤δ≤0.5, excluding certain aliovalent combinations; or an isovalent-aliovalent combination of the formula MxMIyMII1-x-yO2-δ, wherein M, MI, and MII are as set forth above, 0≤x≤1, 0≤y≤1, 0≤δ≤0.5; wherein the ferroelectric structure is in a Pca21 or Pmn21 space group or a subgroup thereof.

The application provides a preparation method of a molybdenum oxide-nickel sulfide heterostructure nanometer array electrocatalyst, and comprises the following steps: 1) preparing a nickel foam (NF) substrate; 2) preparing a homogeneous solution of thiourea and (NH4)6Mo7O 24 ·4H2O in a molar ratio of 10-20:1; 3) dissolving the thiourea and (NH4)6Mo7O 24 ·4H2O in deionized water to obtain a homogeneous solution after stirring; and 4) reacting the nickel foam substrate prepared in the step 1 with the homogeneous solution prepared in the step 2 to obtain a MoO x -Ni3S2 / NF heterostructure nanometer array sample. The technical scheme of the application can greatly improve the conductivity and catalytic efficiency of the catalyst and reduce the manufacturing cost.