964 results about "Molybdenum oxide" patented technology

Provided herein are methods of depositing molybdenum (Mo) films. The methods involve depositing a thin layer of a molybdenum (Mo)-containing film such a molybdenum oxide, a molybdenum nitride, or a molybdenum oxynitride. The Mo-containing film is then converted to an elemental Mo film. A bulk Mo film may then be deposited on the elemental Mo film. In some embodiments, the process is performed at relatively low temperatures.

Systems and methods are provided for etching molybdenum in a wet ALE process. The methods disclosed herein use a wide variety of techniques and wet etch chemistries to oxidize a molybdenum surface and form a self-limiting, molybdenum oxide passivation layer in a surface modification step of the wet ALE process. For example, the methods use: (a) ultra-violet (UV) photolysis of peroxide oxidizers to create oxidizing radicals, which limit oxidation of the molybdenum surface and provide quasi-self-limiting oxidation behavior, (b) steric hinderance of oxidizers having large reactant molecules to achieve better self-limiting oxidation behavior, and / or (c) ligand-assisted oxidation to change the surface chemistry of the molybdenum oxide passivation layer and ensure self-limiting oxidation behavior. After forming the molybdenum oxide passivation layer using one or more of the oxidation techniques disclosed herein, the passivation layer is selectively removed in a dissolution step of the wet ALE process to etch the molybdenum surface.

The invention belongs to the technical field of catalysts, and particularly relates to a supported Co-based catalyst with a nano molybdenum carbide auxiliary as well as a preparation method and application of the supported Co-based catalyst. The preparation method comprises the following steps: depositing molybdenum oxide on the surface of a carrier material by adopting an atomic layer deposition method, then carrying out carburizing treatment to obtain a molybdenum carbide catalyst, depositing cobalt oxide on the surface of the molybdenum carbide catalyst by adopting the atomic layer deposition method, and then carrying out reduction treatment to obtain the supported cobalt-based catalyst with the nano molybdenum carbide assistant. According to the preparation method provided by the invention, the size of molybdenum carbide and the dispersity and valence state of cobalt are controlled by regulating and controlling the deposition times of molybdenum oxide, and the prepared catalyst has excellent catalytic activity and stability in the hydroformylation reaction of long-chain olefin with the carbon atom number being greater than or equal to 5.

The invention relates to the technical field of nano material preparation, and provides a molybdenum powder preparation method and molybdenum powder.The molybdenum powder preparation method comprises the steps that original molybdenum trioxide is subjected to thermal shock treatment, and treated molybdenum trioxide is obtained; the defect of the treated molybdenum trioxide is higher than that of the original molybdenum trioxide; adding the treated molybdenum trioxide and a water-soluble carbon source into a solvent, and carrying out ultrasonic dispersion and ball milling treatment to obtain mixed slurry; dehydrating and drying the mixed slurry to obtain precursor powder of organic carbon coated molybdenum trioxide; performing inert atmosphere reduction treatment on the precursor powder to obtain molybdenum dioxide; carrying out gas reduction deoxidation treatment on the molybdenum dioxide to obtain molybdenum powder; and the particle size of the molybdenum powder is nanoscale. The method disclosed by the invention can be used for preparing the nano molybdenum powder with narrow particle size distribution.

The invention discloses a coating type high-molecular flame-retardant material. The composite material is prepared from the following components: organic silicon modified epoxy resin, a bio-based castor oil derivative, hydroxyapatite, carbon nanofibers, expanded graphite, ammonium polyphosphate, zinc borate, nano silicon dioxide, molybdenum oxide, microencapsulated red phosphorus, magnesium hydroxide, melamine cyanurate, aluminum diethylphosphinate, pentaerythritol, trihydroxymethyl phosphine oxide and a silane coupling agent. The coating is prepared from a titanate coupling agent, stearic acid, polyethylene glycol, 2, 6-butylated hydroxytoluene, triphenyl phosphite, 2, 4-dihydroxybenzophenone, sebacic diester, polytetrafluoroethylene micro powder, a modified polydimethylsiloxane flatting agent, organic montmorillonite, a polyether modified silicon defoaming agent and a solvent. The invention has the beneficial effects of high flame retardant efficiency, environmental friendliness, excellent comprehensive performance and excellent processability.

The invention discloses a supported iron-molybdenum catalyst for formaldehyde production and a preparation method and application thereof, and belongs to the field of catalysts.The catalyst comprises a core-shell structure, the core of the catalyst is a carrier, molybdenum trioxide is supported on the carrier, and the shell of the catalyst is iron molybdate. The carrier is selected from at least one of silicon dioxide, aluminum oxide, titanium oxide, magnesium oxide, magnesium silicate, a molecular sieve, white carbon black and hydroxyapatite; the preparation method comprises the following steps: firstly, loading molybdenum trioxide on a carrier, then dispersing the carrier in deionized water, dropwise adding a molybdenum source solution and an iron source solution in a parallel flow manner under stirring to perform deposition loading of iron molybdate, and performing aging, drying, forming and calcining to obtain the catalyst. The catalyst is used for preparing formaldehyde by oxidizing methanol, dimethyl ether and methylal; according to the catalyst disclosed by the invention, the raw material cost and the pollutant treatment capacity are obviously reduced due to the reduction of the dosage of molybdenum and iron components, and the catalyst has relatively good activity and stability.

The invention relates to the technical field of lubricating oil, in particular to anti-wear and anti-attrition composite lubricating oil and a preparation method and application thereof. The anti-wear and anti-attrition composite lubricating oil is prepared from the following raw materials: base oil, an anti-wear reagent at extreme pressure, a preservative, an antioxidant, a viscosity index improver and a dispersing agent, the extreme pressure anti-wear agent is obtained by modifying layered molybdenum oxide with metal micelles formed by dodecylamine and wet and then carrying out hydrothermal treatment and vulcanization. The prepared anti-wear and anti-attrition composite lubricating oil has excellent anti-wear and anti-attrition effects and extreme pressure properties, is suitable for the lubrication requirements under high load and harsh conditions, and has a wide application prospect.

The application provides a method for grading diesel deep hydrodesulfurization catalysts, which comprises the following steps: loading catalysts containing AlPO4-5 phosphorus aluminum molecular sieves and catalysts containing ETS-10 titanium silicon molecular sieves in the upper and lower parts of a fixed bed hydrogenation reactor respectively according to a loading mass ratio of 1:3-3:1, so that diesel is subjected to hydrodesulfurization reaction through catalysts containing AlPO4-5 phosphorus aluminum molecular sieves first and then through catalysts containing ETS-10 titanium silicon molecular sieves; the carrier of the catalysts containing AlPO4-5 phosphorus aluminum molecular sieves comprises AlPO4-5 phosphorus aluminum molecular sieves and aluminum oxide powder, the carrier of the catalysts containing ETS-10 titanium silicon molecular sieves comprises ETS-10 titanium silicon molecular sieves and aluminum oxide powder, and the active components of the two kinds of catalysts respectively comprise a combination of two or three of nickel oxide, molybdenum oxide and cobalt oxide. The sulfur content of the hydrogenated diesel obtained through the method can be as low as 10 μg / g or below.

The invention provides a beneficiation and enrichment method for high-molybdenum oxide ore, which comprises the following steps of: performing fraction magnetic separation on a product after ore grinding, regrinding magnetic separation coarse particle tailings, mixing the reground product with magnetic separation fine fraction tailings to perform low-potential sulphide ore flotation, performing oxidized ore flotation on sulphide ore flotation tailings, and the like. And finally, the molybdenum concentrate with the high recovery rate and grade is obtained, the molybdenum ore separation and enrichment effect is achieved, and the fine disseminated-particle-size refractory molybdenum oxide ore resources in the high-oxidation-type molybdenum ore are effectively and comprehensively recycled. In order to quickly optimize and obtain the optimal condition of oxidized ore flotation, the flotation inhibitor with the good inhibition effect is determined through the pure ore flotation test, the flotation collecting agent with the high selectivity is selected through the molecular simulation calculation method, and the flotation efficiency and selectivity are improved. The method provided by the invention can be widely applied to the fields of development of high-oxidation molybdenum ore mines and recycling of fine-fraction refractory molybdenum oxide ore resources in tailings after sulfuration flotation.

The invention provides a manganese zinc ferrite material as well as a preparation method and application thereof. The manganese zinc ferrite material is prepared from main components and auxiliary components, the main component is prepared from the following components in molar ratio: 51.5 to 53.0 mol percent of ferric oxide, 17.0 to 18.5 mol percent of zinc oxide and 29.0 to 30.0 mol percent of manganese oxide; the auxiliary components comprise the following components according to the total weight of the main components: 200 to 2000 ppm of nano-scale bismuth oxide, 200 to 2000 ppm of nano-scale calcium carbonate, 200 to 2000 ppm of nano-scale molybdenum oxide, and 0 to 4000 ppm of nano-scale cobalt oxide. By optimizing the components and the proportion of the ferrite material, improving the preparation process and organically combining the formula and the process, the ferrite material with high magnetic conductivity, high Curie temperature, wide frequency and wide temperature is finally prepared, and large-scale popularization and application are facilitated.

The invention provides a molybdenum-based oxide sintered body, a sputtering target material containing the sintered body, and an oxide thin film formed by the sputtering target material. In the present invention, a specific dopant is added to a molybdenum oxide and a niobium oxide that are difficult to sinter in a prescribed content range, and it is possible to simultaneously ensure improved sinterability, high density characteristics, and uniformity, low reflection, and low resistance characteristics of a thin film obtained by controlling particle growth even if pressureless sintering is performed.

The invention discloses an anti-phosphoric-acid platinum-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of fuel cells. The preparation method of the anti-phosphoric acid platinum-based catalyst comprises the following steps: mixing a carbon-supported platinum catalyst and molybdate in ethylene glycol, and carrying out condensation reflux to obtain a molybdenum oxide modified carbon-supported platinum catalyst; mixing the molybdenum oxide modified carbon-supported platinum catalyst and dopamine hydrochloride in a buffer solution, stirring for the first time, adding transition metal salt, stirring for the second time, performing suction filtration, and drying to obtain a pretreated molybdenum oxide modified platinum-based alloy catalyst; and carrying out annealing treatment on the pretreated molybdenum oxide modified platinum-based alloy catalyst to obtain the anti-phosphoric acid platinum-based catalyst. The anti-phosphoric acid platinum-based catalyst has excellent oxygen reduction initial activity, anti-phosphoric acid performance and electrochemical stability, and can effectively solve the problem of phosphoric acid poisoning of a platinum-based catalyst of a high-temperature proton exchange membrane fuel cell.

The present invention relates to a process for producing molybdenum dioxide dichloride, which is a very efficient process that does not use hazardous chlorine gas and high reaction temperatures and enables the production of molybdenum dioxide dichloride in high yield without solvent.

The invention discloses a preparation method of a high-strength molybdenum alloy wire and the high-strength molybdenum alloy wire. The technical problem that in the prior art, a molybdenum alloy wire is small in tensile strength is solved. The preparation method of the high-strength molybdenum alloy wire comprises the following steps that molybdenum oxide, rhenium oxide, ruthenium oxide and tungsten oxide are subjected to ball milling and mixing; adding a mixed solution containing cerium ions, yttrium ions and lanthanum ions into the ball-milled and mixed slurry, and continuing ball-milling and mixing; carrying out spray drying on the slurry to obtain composite powder; performing high-temperature hydrogen reduction treatment to obtain multi-component doped molybdenum powder; and the high-strength molybdenum alloy wire is obtained through compression molding treatment, high-temperature sintering treatment, high-temperature rotary swaging and wire drawing treatment.

The invention relates to superfine molybdenum powder and a converter reduction preparation method thereof, belongs to the technical field of rare metal powder metallurgy, and solves the problems that the existing molybdenum powder preparation process is easy to cause hardening and agglomeration, the appearance granularity of the molybdenum powder cannot be controlled, the reduction process is complicated, the efficiency is low, the energy consumption is high and the cost is high. The method comprises the following steps: (1) preparing molybdenum oxide powder; (2) adding the molybdenum oxide into a converter, and introducing hydrogen for reduction; wherein the molybdenum oxide powder is nanoscale molybdenum oxide. The contact area between the adopted nanoscale molybdenum oxide powder raw material and the reducing gas is large, the converter rotates to drive the raw material powder to flow, full contact between the raw material powder and the reducing gas is promoted, hardening and agglomeration are inhibited, the reduction efficiency is improved, one-step reduction is achieved, the morphology is easy to control, and no waste gas is generated; compared with a traditional static pusher furnace, the closed dynamic converter has the advantages that reduction hydrogen escape is greatly reduced, safety is improved, energy consumption is reduced, and the use amount of hydrogen is greatly reduced.

The invention provides a perovskite solar cell and a preparation method thereof, the perovskite solar cell comprises a substrate, a conductive anode, a hole transport layer, a perovskite light absorption layer, an electron tunneling protection layer, a hole barrier layer and a conductive cathode which are stacked in sequence, and the material of the electron tunneling protection layer comprises aluminum oxide and / or molybdenum oxide; the hole blocking layer is made of tin oxide and / or IZO. According to the invention, the electron tunneling protection layer is arranged between the perovskite light absorption layer and the hole blocking layer, so that the damage to perovskite in the process of depositing the buffer layer of the hole blocking layer is blocked, and the stability of the cell is greatly improved; and tin oxide and / or IZO can be directly deposited without using C60, so that the manufacturing cost is greatly reduced, and a device with higher stability is obtained.

The invention discloses a method for purifying electronic grade molybdenum dioxide dichloride, which comprises the following steps of: removing low-boiling-point substances by adopting a sublimation method, collecting sublimation gas of which the main component is a target product by adopting sublimation in a fixed temperature interval, then removing substances with different chemical properties and polarities by adopting a complexing and decomplexing method, and finally further removing impurities by sublimation to obtain the electronic grade molybdenum dioxide dichloride. And finally obtaining the electronic grade molybdenum dioxide dichloride with the purity not lower than 7N grade. The method has the characteristics of good purification effect, multi-method comprehensive impurity removal, industrial large-scale application, stable quality, high yield and simple and easy-to-separate impurity components.

The invention discloses a preparation method of a reverse water gas shift catalyst and an application thereof, comprising the following steps: S1: weighing a metal oxide precursor, a molybdenum oxide precursor and citric acid respectively and dissolving them in a beaker to obtain a mixed solution A; S2. adjusting the pH value of the mixed solution A with an acidic solution; S3. heating and stirring the mixed solution A in a water bath until it is in a gel state and drying, and then calcining it in a muffle furnace to obtain a carrier material; S4-S6. preparing a reverse water gas shift catalyst; the catalyst of the invention loads copper on the carrier material by a co-precipitation method, and the carrier material is reported for the first time, and has the advantages of simple preparation steps, easy availability of raw materials, safe operation, etc. At the same time, the catalyst obtained by the invention has an excellent CO conversion rate and a CO selectivity close to 100%.

The invention discloses a defect passivation perovskite solar cell and a preparation method thereof, and belongs to the technical field of solar cell preparation. The preparation method comprises the following steps: mixing a SnO2 aqueous solution and an organic hydrochloride solution, and carrying out ultrasonic treatment to obtain an organic hydrochloride doped SnO2 precursor solution; preparing a halogen-containing compound solution and an organic salt solution as a perovskite precursor solution; the preparation method comprises the following steps: uniformly mixing Fk209, tBP, Li-TFSI, Spiro-OMeTAD and chlorobenzene or tBP, Li-TFSI, P3HT and chlorobenzene to obtain a hole transport layer precursor solution; the preparation method comprises the following steps: preparing a SnO2 electron transport layer, a perovskite absorption layer and a hole transport layer on a substrate material in sequence, and finally preparing a molybdenum oxide layer and a silver electrode on the hole transport layer. The problem that a large number of defects exist in existing perovskite solar cell preparation is solved, and the carrier transmission capacity and the photoelectric conversion efficiency are improved.

The invention relates to the technical field of alloy processing, and discloses a high-performance corrosion-resistant nickel-based alloy plate and a preparation method thereof, and the method comprises the following steps: raw material preparation, smelting treatment, casting treatment, hot rolling treatment, solution treatment, aging treatment and surface passivation treatment. According to the invention, when a composite acid system is adopted for passivation treatment, the concentration of chromium / molybdenum atoms in a passivation film is optimized and balanced due to the specific ratio of nitric acid to chromic acid, a chromium oxide provides a compact passivation barrier, and a molybdenum oxide endows the film layer with a self-repairing characteristic to synergistically inhibit pitting nucleation; meanwhile, nano titanium dioxide particles pretreated by silane are embedded into the passivation film in situ under the action of ultrasonic oscillation, organic pollutants adsorbed on a film layer can be decomposed by the photocatalytic characteristic of the nano titanium dioxide particles, the local corrosion effect of a battery caused by dirt coverage is avoided, and the performance of the battery is improved through double upgrading of components and the structure of the passivation film. And the alloy plate has excellent pitting corrosion resistance and fouling resistance in a chloride ion-containing medium.

The invention provides a preparation method of high-purity molybdenum trioxide, which belongs to the technical field of molybdenum trioxide production and comprises the following steps: S1, crushing, grinding and roasting molybdenum ore sand to obtain crude molybdenum oxide, adding the crude molybdenum oxide into a sodium hydroxide solution, heating, stirring and filtering to obtain a crude sodium molybdate solution; s2, adjusting the pH value of the crude sodium molybdate solution to 5.5-7.0, introducing the crude sodium molybdate solution into an exchange column of macroporous cation exchange resin, then adjusting the pH value of the solution to 7.0-8.5, and introducing the crude sodium molybdate solution into an exchange column filled with anion exchange resin to obtain a high-purity sodium molybdate solution; s3, excessive ammonia water is added into the high-purity sodium molybdate solution, ammonium molybdate is separated out, washing and drying are conducted, and high-purity ammonium molybdate is obtained; and S4, the high-purity ammonium molybdate is put into a rotary calcining furnace, rare earth oxide is sprayed on the inner wall of a furnace tube, and the high-purity molybdenum trioxide is prepared by adopting a calcining mode of firstly heating, then cooling and then heating. According to the invention, the purpose of producing high-purity molybdenum trioxide is realized.

The present invention relates to the technical field of heavy oil hydrodesulfurization, and discloses a hydrodesulfurization catalyst preparation process, which comprises: adding deionized water, a nickel source, a molybdenum source and a dispersant into a reaction container, stirring to obtain a metal solution, pouring into a container filled with gamma-Al2O3, impregnating, drying, and roasting to obtain the hydrodesulfurization catalyst. The dispersing agent contains a large number of nitrogen atoms and a plurality of carboxyl groups and hydroxyl groups, has very strong coordination chelation performance on nickel and molybdenum, improves the dispersity of nickel and molybdenum precursors, enables the nickel and molybdenum precursors to be uniformly impregnated into a gamma-Al2O3 carrier, and nickel oxide and molybdenum oxide are uniformly distributed in the gamma-Al2O3 carrier after calcination, so that the nickel and molybdenum oxide-modified gamma-Al2O3 composite material is prepared. The obtained hydrodesulfurization catalyst can expose more nickel-molybdenum catalytic active centers, effectively catalyzes and removes sulfur-containing substances such as thiophenes in straight-run diesel oil, shows a higher desulfurization rate, and improves the quality of oil products.

The invention provides a molybdenum mineral content measuring method, and belongs to the field of process mineralogy, and the method comprises the following steps: carrying out ore grinding, ore washing and desliming treatment on a to-be-measured sample to obtain slurry and ore washing concentrate; the ore washing concentrate is subjected to gravity separation, and gravity separation concentrate and gravity separation tailings are obtained through separation; mixing the slime and the gravity concentrate to obtain a mixed sample, and performing molybdenum phase analysis to obtain the content of molybdenum oxide; an automatic mineralogical analysis sample of the mixed sample and an automatic mineralogical analysis sample of the gravity separation tailings are prepared respectively, automatic mineralogical analysis is carried out, and a molybdenite content correction coefficient and a molybdenum oxide content correction coefficient are calculated; and calculating the content of various molybdenum minerals in the to-be-detected sample in combination with the correction coefficient and the mineral content data. By optimizing the sample preparation process, molybdenite oxidation is reduced, and the mineral recognition accuracy is improved. Molybdenum oxide and molybdenum sulfide are treated separately, different correction processes are adopted, and the accuracy of ore molybdenum mineral measurement is improved in a targeted mode.

The invention discloses a Mo-Bi-based catalyst and a preparation method and application thereof.The catalyst comprises active components, the active components comprise spherical particles and molybdenum oxide nanorods attached to the surfaces of the spherical particles, and the spherical particles contain molybdenum and / or molybdenum oxide and bismuth and / or bismuth oxide. When the catalyst is applied to propylene oxidation synthesis of acrolein, the catalyst has the technical effect of high acrolein selectivity.

The invention belongs to the technical field of solar cells, and particularly relates to a composite layer for a laminated solar cell and application of the composite layer. The invention aims to provide a novel intermediate composite layer material based on metal nitrogen oxide, the novel intermediate composite layer material specifically comprises titanium oxynitride, tantalum oxynitride and molybdenum oxynitride, and the composite layer material has the advantages of proper energy level matching, good light transmission, small parasitic absorption, excellent carrier recombination performance, low preparation cost and good stability. The material is prepared by adopting magnetron sputtering and atomic layer deposition methods, the preparation process is simple, the deposition damage is small, the photoelectric property of the material can be regulated and controlled by adjusting deposition parameters, and then excellent carrier recombination performance is achieved. Compared with a common doped indium oxide composite layer and a doped silicon film tunnel junction, the metal nitrogen oxide intermediate composite layer has the advantages of simple preparation process, low cost, small optical parasitic absorption and the like; and the lateral conductivity is relatively low, so that the method is suitable for preparing a large-area perovskite / crystalline silicon laminated cell.

The present invention belongs to the technical field of lithium-ion batteries and relates to a method for preparing a surface-coated manganese dioxide negative electrode material. The present invention discloses a method for preparing a surface-coated manganese dioxide negative electrode material, wherein manganese sulfate and potassium permanganate are dissolved in deionized water, and then the entire solution is transferred into a polytetrafluoroethylene-lined autoclave, and subjected to a high-temperature hydrothermal reaction. The precipitate after the reaction is washed and dried to obtain a product MnO 2 , the prepared MnO 2 Re-disperse in deionized water and add copper acetate, (NH 4 ) 6 Mo 7 O 24 •4H 2 O; add folic acid ethanol solution to the above dispersion, stir at room temperature for several hours, separate and wash the precipitate, dry the precipitate and calcine it in an argon atmosphere in a tube furnace to obtain a coated manganese dioxide negative electrode material. The surface coating layer of the manganese dioxide negative electrode material of the present invention is molybdenum oxide, copper and nitrogen-doped carbon, and the three components in the coating layer enhance the electrochemical properties of the composite material through a synergistic effect.

The present invention relates to a method of producing a catalyst structure comprising molybdenum carbide on a porous carrier compound, comprising preparing a mixture comprising a porous carrier compound and a molybdenum oxide; shaping the mixture into a porous green body by a 3D-printing technique; and carburizing the porous green body by exposing the mixture to a reducing atmosphere comprising a carbon-comprising gas at a temperature between 650 °C and 1000 °C, thereby converting at least a portion of the molybdenum oxide into molybdenum carbides and obtaining a catalyst structure having an elevated temperature; cooling the catalyst structure having an elevated temperature to room temperature in an atmosphere which is inert with respect to molybdenum oxide, thereby obtaining the catalyst structure; wherein the concentration of molybdenum oxide in the mixture is such that a ratio of the molybdenum content in the mixture to the BET surface area of the porous carrier compound in the mixture is equal to or lower than 2.5 * 10-5 molMo / m², wherein the molybdenum content in the mixture is measured by ICP-OES and the BET surface area is measured by multi-point BET analysis of a N2 adsorption isotherm. The invention further relates to a catalyst structure obtained by the methods of the invention.

The invention relates to the technical field of nano powder material preparation, in particular to a method for preparing molybdenum powder based on a spray granulation precursor and the molybdenum powder. The method for preparing the molybdenum powder comprises the steps that ammonium molybdate and a pore forming agent are dissolved in ultrapure water at the room temperature, and mixed slurry is obtained; carrying out spray granulation treatment on the mixed slurry to obtain composite powder particles containing the pore-forming agent and ammonium molybdate; the composite powder particles are placed in an oxygen-containing atmosphere to be roasted, and superfine nano molybdenum trioxide is obtained; placing the superfine nano molybdenum trioxide in a hydrogen atmosphere for primary reduction treatment to obtain superfine molybdenum dioxide powder; and the superfine molybdenum dioxide powder is subjected to second-stage reduction treatment, the superfine molybdenum powder is obtained, and the reduction conditions of the first-stage reduction treatment and the second-stage reduction treatment are different. According to the preparation method, the superfine molybdenum powder with good uniformity and dispersity can be prepared.

The invention relates to the technical field of superfine molybdenum powder preparation, in particular to a preparation device and method for low-oxygen superfine molybdenum powder. The specific preparation device comprises a sublimation bin, a reaction area and a gas-solid separation bin which are sequentially connected, the reaction zone comprises a preheating zone, a reduction zone and a conversion zone; a part of the hydrogen pipeline and a part of the carbon monoxide pipeline are arranged in the preheating area; one end of the hydrogen pipeline extends to the reduction area and is used for providing preheated hydrogen and carrying out gas-phase reduction reaction on the preheated hydrogen and the gas-phase MoO3 subjected to heat preservation; one end of the carbon monoxide pipeline extends to the conversion area and is used for providing preheated carbon monoxide and reacting with water vapor to complete primary water vapor conversion; meanwhile, partial carbon monoxide is subjected to a disproportionation reaction to generate micro carbon powder, and the micro carbon powder and water vapor are subjected to a water gas reaction to complete secondary water vapor conversion. The problem that the oxygen content of existing superfine molybdenum powder prepared through gas-phase molybdenum trioxide reduction is too high is solved.

The invention provides a preparation method of a molybdenum phosphide / titanium nitride composite material and a battery positive electrode material and a lithium-carbon dioxide battery, and belongs to the technical field of new energy materials. And then a titanium nitride conductor layer is deposited on the molybdenum phosphide by using an atomic layer deposition technology to prepare the molybdenum phosphide / titanium nitride, the molybdenum phosphide is combined as a transition metal phosphide to have stable catalytic performance, and the titanium nitride is used as a conductor to have excellent conductivity. The lithium-carbon dioxide battery positive electrode catalyst with high catalytic activity, high conductivity and excellent stability is obtained through the synergistic effect of the two materials, and when the lithium-carbon dioxide battery positive electrode catalyst is applied to a lithium battery, higher energy density, longer cycle life and better rate capability are shown, so that the overall performance of the battery is improved, and the application prospect is wide. The requirements on high-performance batteries in the fields of electric automobiles, energy storage systems and the like are met.