237 results about "Molybdenum carbide" patented technology

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 discloses a rare earth oxide modified high-entropy hard alloy and a preparation method thereof. A high-entropy hard phase (high-temperature calcination), a high-entropy binding phase and rare earth oxide are adopted, grinding, pressing and air pressure sintering at the temperature of 1450-1550 DEG C are conducted, and the high-entropy hard phase is prepared from tungsten carbide, titanium carbide, zirconium carbide, yttrium carbide, manganese carbide, chromium carbide and molybdenum carbide; the high-entropy binding phase comprises the following components: cobalt and a CoCrFeNi-series high-entropy alloy; and the component of the rare earth oxide is Y2O3 or Nd2O3. The prepared rare earth oxide modified high-entropy hard alloy has the advantages of high strength, high compactness, high hardness, high wear resistance and the like.

The invention discloses a molybdenum carbide / nitrogen-doped carbon composite material and a preparation method and application thereof, and belongs to the technical field of new energy materials and devices. The preparation method comprises the following steps: uniformly mixing ammonium molybdate, glucose and g-C3N4, and carrying out hydrothermal and high-temperature calcination treatment to obtain a composite material (Mo2C / NC) in which a nano Mo2C electrocatalyst is dispersed and distributed on a nitrogen-doped carbon matrix. The nitrogen-doped carbon in the composite material has a hierarchical porous structure, so that the electrolyte permeation and ion transmission capabilities are enhanced; the nitrogen-doped active sites not only enhance the adsorption performance of the porous carbon on polysulfide, but also improve the catalytic activity by optimizing the coordination structure of Mo2C; mo2C can chemically adsorb and efficiently catalyze reversible conversion of polysulfide, and the utilization rate of active substances is increased. When the composite material is used as a positive electrode additive of a lithium-sulfur battery, dissolution and shuttling of polysulfide can be effectively inhibited, so that the battery has high specific capacity, rate capability and excellent cycle reversibility.

The invention discloses a WC-TiC-Mo2C-carbonfiber-8Co hard alloy and a preparation method thereof, and relates to the technical field of hard alloy preparation, the method comprises the following steps: S1, mixing tungsten carbide, cobalt, titanium carbide, molybdenum carbide and carbon fibers to obtain mixed powder; s2, the mixed powder is subjected to pre-pressing forming, and a hard alloy intermediate is obtained; and S3, the hard alloy intermediate is subjected to high-temperature and high-pressure sintering, and the WC-TiC-Mo2C-carbon fiber-8Co hard alloy is obtained. Wherein the conditions of high-temperature and high-pressure sintering are as follows: the sintering temperature is 1300-1450 DEG C, the sintering pressure is 2-6 GPa, and the heat preservation time is 2-10 minutes. By means of the preparation method, the hardness, toughness and other mechanical properties of the hard alloy can be further improved.

This invention belongs to the field of catalytic material preparation technology, specifically relating to a method for preparing high specific surface area pure phase α-type molybdenum carbide by hydrogen intercalation modification of MoO3 and its application, including the following steps: (1) adding MoO3 powder to hydrochloric acid and dispersing it to prepare a mixture of MoO3 and hydrochloric acid; (2) adding metal powder to the mixture in step (1) and performing pre-reduction treatment by in-situ hydrogenation of the metal and hydrochloric acid to prepare H x MoO3 precursor; (3) H prepared in step (2) x The MoO3 precursor is carbonized under a carbon source gas to obtain a pure α-type molybdenum carbide with a high specific surface area. This method is simple and effective, avoids the use of corrosive NH3 gas during carbonization, and does not require a metal as a medium, thus solving the current problem of not being able to prepare metal-free modified pure α-MoC in one step.

Molybdenum(0) coordination complexes comprising ligands which each coordinate to the metal center by nitrogen or phosphorous are described. Methods for depositing molybdenum-containing films on a substrate are described. The substrate is exposed to a molybdenum precursor and a reactant to form the molybdenum-containing film (e.g., elemental molybdenum, molybdenum oxide, molybdenum carbide, molybdenum silicide, molybdenum nitride). The exposures can be sequential or simultaneous.

The invention discloses a high-dispersion and small-particle-size alpha-MoC1-x / SiO2 catalyst as well as a preparation method and application thereof. The catalyst is composed of alpha-MoC1-x nanoparticles dispersed on a silicon dioxide carrier, the alpha-MoC1-x / SiO2 catalyst is generated in a three-dimensional SiO2 confined network in a limited manner, wherein the three-dimensional SiO2 confined network is constructed by in-situ polycondensation of silica sol under the condition that the pH value is 2.3-2.8, and the molybdenum content is 30-60%; the average particle size of the alpha-MoC < 1-x > nanoparticles is 1.0-2.2 nm, and the alpha-MoC < 1-x > nanoparticles are highly dispersed in the SiO2 confinement structure; the alpha-MoC1-x nano-particles are face-centered cubic phase molybdenum carbide, and the mass fraction of the face-centered cubic phase molybdenum carbide is larger than or equal to 90 wt%. The alpha-MoC1-x / SiO2 obtained by the invention can realize higher methanol selectivity and intrinsic activity under the condition of 140-180 DEG C, and can stably operate for 100 hours. The invention provides a novel small-particle-size and high-dispersion molybdenum carbide catalytic material and a preparation strategy thereof for preparing methanol through low-temperature and high-selectivity CO2 hydrogenation.

MAX-phase Mo2Ga2C is used as a matrix, a liquid phase corrosion method is utilized, the preparation of the two-dimensional vacancy doped molybdenum carbide (Mo2-CTz) nano material is realized through excessive corrosion, and the two-dimensional vacancy doped molybdenum carbide (Mo2-CTz) nano material is applied to the aspect of a hybrid supercapacitor. Compared with other reported MXene materials, the influence of vacancy doping measures on the Mo2CTz nanometer material is studied, the layered MAX ceramic powder is excessively corroded through hydrofluoric acid, vacancies are introduced into a metal layer, vacancy doping of MXene is achieved, and the capacitive performance of the MXene is improved. And vacancy defects are introduced, so that the interlayer spacing of MXene can be increased, activation sites on the surface of the layered structure can be increased, the conductivity of the two-dimensional material can be improved, the utilization rate of pseudocapacitance active sites of the two-dimensional material can be improved, and finally the capacitive performance of the Mo < 2->-CTz-based electrode can be enhanced. The successful development of the two-dimensional vacancy doped Mo < 2->-CTz self-supporting film electrode material lays a foundation for the practical application of electrochemical energy storage devices such as hybrid supercapacitors and ion batteries.

The invention belongs to the technical field of nano confinement, and provides a method for preparing multi-grain-boundary molybdenum carbide nano-particles through a precise double-confinement path and application of the multi-grain-boundary molybdenum carbide nano-particles. The preparation method comprises the following steps of: coating polymer hydrogel on a carbon carrier in situ by taking a Ni-porphyrin cross-linking agent as a nickel source and phosphomolybdic acid as a molybdenum source, and preparing a Ni and PMo12 ortho-position double-confinement carbon-coated precursor by accurately controlling the ratio of the phosphomolybdic acid to the cross-linking agent and cross-linking through a self-confinement Ni-containing cross-linking agent Ni porphyrin cross-linking agent; the proportion of a Mo source to a cross-linking agent is precisely limited, and the multi-grain-boundary molybdenum carbide catalyst regulated and controlled by Ni atoms is prepared based on double-confinement pyrolysis. The molybdenum carbide catalyst containing a plurality of crystal boundaries is accurately prepared on the carbon substrate, and the OER catalytic performance of the molybdenum carbide catalyst is researched. Accurate regulation and control on the defect state of the molybdenum carbide nanosheet are realized, so that the intrinsic catalytic activity of molybdenum carbide is improved. The prepared catalyst shows excellent electrochemical performance in electro-catalysis oxygen evolution, and efficient water electrolysis oxygen evolution is achieved.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method and application of a catalyst for synthesizing deuterated ammonia. The preparation method comprises the following steps: S1, adding molybdenum carbide into a hydrofluoric acid solution, magnetically stirring for 72-96 hours, washing and centrifuging with water, and repeatedly washing and centrifuging until the pH (Potential of Hydrogen) gt; 5, obtaining acid etching molybdenum carbide; s2, adding an alkaline solution into the acid-etched molybdenum carbide, carrying out ultrasonic treatment at room temperature until the pH value of the solution is 7, and then carrying out centrifugal solid-liquid separation to obtain layered molybdenum carbide; and S3, mixing the cobalt chloride hexahydrate solution and molybdenum carbide at 400-600 DEG C to react for 3-6 hours, and performing vacuum freeze drying to obtain the Co / molybdenum carbide catalyst. The catalyst prepared by the method is applied to synthesis of deuterated ammonia by reaction of nitrogen and deuterium gas, and is low in cost, pollution-free, high in conversion rate and simple to prepare.

The application provides a preparation method and application of a molybdenum carbide loaded jute derived porous carbon material, and belongs to the technical field of electrochemical catalysis. The preparation method comprises the following steps: pretreating jute fibers to obtain jute powder; placing the jute powder in a molybdenum compound containing solution to obtain a mixture, the jute powder in the mixture adsorbing the molybdenum compound, and the mass ratio of the jute powder to the molybdenum compound in the molybdenum compound containing solution being any value in 1:(2.5-6.25); and carbonizing the jute powder adsorbing the molybdenum compound at 800-900 DEG C to obtain the molybdenum carbide loaded jute derived porous carbon material. The jute fiber derived porous carbon is used as a carrier, and the precursor is fully adsorbed and combined in the molybdenum compound containing solution. By adjusting the mass ratio and the carbonization temperature, the highly dispersed and stably loaded molybdenum carbide is realized, the structural stability and catalytic activity of the molybdenum carbide based catalyst are improved, and the catalytic efficiency of the hydrogen evolution reaction is further improved.

The invention belongs to the technical field of a preparation method of a multi-component composite catalyst, and discloses a preparation method of a nickel-doped molybdenum carbide composite perovskite catalyst, which comprises the following steps: maintaining a constant high-temperature condition in a single reactor, continuously executing minute-level instantaneous gas phase pulse according to a preset time sequence, according to the method, deposition in-situ instantaneous carbonization of molybdenum-containing species and deposition of nickel-containing species are sequentially completed, and finally rapid cooling is carried out. Separation of process time is utilized to cope with migration and agglomeration trends generated by thermodynamic driving of all solid-phase components at continuous high temperature; the formation of the microstructure of the catalyst is controlled by the time sequence of the gas phase pulse instead of a single temperature field, so that the high dispersion state of the active component can be locked and stored by a dynamic process in a necessary high-temperature reaction environment.

The application belongs to the technical field of catalysts, and relates to a supported molybdenum carbide catalyst, which comprises a carrier and an active component; the carrier is MY molecular sieve, and the active component is molybdenum carbide; M is one or two of Co, Ni and Cu. A preparation method thereof is also disclosed, in which a molybdenum source solution is mixed with MY molecular sieve, dried, calcined, and then carbonized in a reducing mixed gas atmosphere to obtain the supported molybdenum carbide catalyst. The Y molecular sieve has good hydrothermal stability, a typical microporous structure, a large specific surface area, and can better disperse the active substance, so that more active components are exposed on the surface and participate in the reaction, and at the same time, smaller and more dispersed metal particles are obtained, which can effectively avoid the contact between the metal particles and the molybdenum carbide; on the other hand, the metal M is beneficial to H2 activation, improves the H2 dissociation capacity, and is helpful to remove the hydroxyl groups remaining on the surface of the molybdenum carbide during the reaction.

The invention belongs to the technical field of synthesis of 2-methoxy-4-methylphenol, and particularly discloses a bimetallic-based catalyst for synthesizing 2-methoxy-4-methylphenol through vanillin hydrogenation as well as a preparation method and application of the bimetallic-based catalyst. Molybdenum carbide (alpha-MoC) is adopted as a carrier, cobalt and iron are loaded by an impregnation method to obtain the bimetallic-based catalyst, and the bimetallic catalyst can be used for obtaining a 2-methoxy-4-methylphenol product with high added value at high yield by taking vanillin as a raw material under mild reaction conditions. The method is short in synthesis process, low in cost, economical, effective, high in universality, environment-friendly, free of corrosion to equipment and high in product quality. The bimetallic-based catalyst not only has excellent catalytic hydrodeoxygenation performance on vanillin, but also has relatively high selectivity on 2-methoxy-4-methylphenol, and in addition, the bimetallic-based catalyst also has excellent cycle stability, wide market prospect and remarkable economic potential.

The invention provides a method for generating molybdenum dioxide or molybdenum carbide through reduction of molybdenum trioxide and application, and the method comprises the following steps: dispersing MoO3 powder in a mixed solution of monohydric alcohol and polyhydric alcohol, adding a triblock copolymer P123 stabilizer, carrying out microwave-assisted solvothermal reaction on the obtained suspension, centrifuging or filtering and washing to obtain molybdenum dioxide or molybdenum carbide; the obtained brown H0. 93MoO3 / C precursor microspheres are placed in an argon plasma environment, high-temperature calcination is carried out at the temperature of 500-600 DEG C for 30-60 min, and brown black MoO2 / C microspheres are obtained; or placing the H0. 93MoO3 / C precursor in a hydrogen-argon plasma environment, and calcining the H0. 93MoO3 / C precursor at a high temperature of 500-600 DEG C for 30-60 minutes to obtain the gray Mo2C / C microspheres. The MoO2 / C and Mo2C / C materials prepared in the invention have nanocrystalline characteristics and excellent electrochemical performance, and have good commercial application prospects as lithium battery negative electrode materials.

A reflective photomask blank has a substrate 10; and a multilayer reflective film 50. The multilayer reflective film 50 has a periodic stacked structure in which a low refractive index layer 30 containing ruthenium (Ru), a high refractive index layer 20 containing silicon (Si), and a diffusion prevention layer 40. The diffusion prevention layer 40 is formed in contact with the low refractive index layer 30 on both or one of a side of the low refractive index layer 30 close to the substrate 10 and a side of the low refractive index layer 30 away from the substrate 10. The diffusion prevention layer 40 is one or more sublayers selected from a layer containing a silicon nitride (SiN), a layer containing silicon carbide (SiC), a layer containing molybdenum (Mo), a layer containing a molybdenum nitride (MoN), and a layer containing molybdenum carbide (MoC).

The invention provides a nitrogen-doped carbon nanosphere-molybdenum carbide-carbon nanotube composite material and a preparation method and application thereof in hydrogen evolution by electrolysis of water, the preparation method comprises the following steps: combining phosphomolybdic acid with dopamine through interaction, grinding with melamine to fully mix, and finally calcining in one step to obtain the nitrogen-doped carbon nanosphere-molybdenum carbide-carbon nanotube composite material. The nitrogen-doped carbon nanosphere-molybdenum carbide-carbon nanotube composite material is prepared by the following steps of: carbonizing polydopamine and melamine and doping nitrogen and molybdenum, catalyzing molybdenum to generate a carbon nanotube, and finally obtaining the nitrogen-doped carbon nanosphere-molybdenum carbide-carbon nanotube composite material, and applying the nitrogen-doped carbon nanosphere-molybdenum carbide-carbon nanotube composite material to the catalytic research of hydrogen evolution reaction by electrolysis of water. Compared with the traditional preparation method, the method disclosed by the invention is simple, rapid, mild in reaction condition and high in yield, and the prepared composite material is uniform in morphology and has excellent electro-catalytic performance on a water electrolysis hydrogen evolution reaction.

The invention relates to a molybdenum carbide-based catalyst for hydrogen production by methanol reforming and a preparation method and application thereof, the molybdenum carbide-based catalyst is CCu / MoC, Cu / MoO3 is used as a precursor, and activated carbon is doped to prepare the molybdenum carbide-based catalyst; in the molybdenum carbide-based catalyst, a metal component Cu loaded on alpha-MoC is a main active component; the preparation method comprises the following steps: roasting molybdenum metal oxide to obtain MoO3; adding a copper metal compound into MoO3, grinding, further drying, and roasting to obtain a Cu / MoO3 catalyst precursor; and uniformly mixing the Cu / MoO3 catalyst precursor with the modified activated carbon, reducing, carbonizing and passivating to obtain a CCu / MoC catalyst, namely the molybdenum carbide-based catalyst. Compared with the prior art, the preparation method has the advantages that the formation of an alpha-MoC crystal phase in the carbonization process of the molybdenum carbide-based catalyst can be effectively promoted, and the dispersion degree of active components on the surface of the carrier is greatly improved, so that the catalyst has good low-temperature activity and hydrogen production efficiency, and meanwhile, the catalyst also has good stability and relatively low CO selectivity.

The application discloses a biomass-based nitrogen-doped carbon-carbide molybdenum composite catalyst and a preparation method and application thereof, and is characterized in that: a widely-sourced biomass, especially agricultural biomass waste, is used as a carbon and nitrogen source, ammonium molybdate is used as a molybdenum source, and a nitrogen-doped carbon-carbide molybdenum composite catalyst is prepared through one-step pyrolysis under an ammonia atmosphere; the catalyst is mesoporous nitrogen-doped carbon loaded with pure beta-phase carbide molybdenum, has the characteristics of a large pore size, high dispersion of beta-phase carbide molybdenum and the like, and has good thermal stability; the catalyst can efficiently denitrogenate quinoline and directively convert the quinoline, and high-selectivity aromatic hydrocarbon products can be obtained; the conversion rate is not less than 99%, the denitrogenation rate is not less than 99%, the selectivity of aromatic compounds is not less than 86%, and the catalyst has the characteristics of low hydrogen consumption due to the avoidance of hydrogen saturation reaction.

The invention belongs to the field of catalyst preparation, and particularly discloses a method for preparing carbon-coated molybdenum phosphide, which comprises the following steps: by using molybdenum carbide as a framework and a template, replacing carbon atoms in the molybdenum carbide through phosphorization reaction to obtain the molybdenum phosphide. The in-situ replacement mode belongs to a non-destructive replacement reaction, the original morphology and structure of molybdenum carbide can be kept, and meanwhile, part of the replaced carbon is deposited on the surface of molybdenum phosphide to form an in-situ carbon layer which is tightly coated on the surface of molybdenum phosphide. According to the in-situ replacement method provided by the invention, the preparation difficulty of the carbon-coated molybdenum phosphide can be greatly reduced, and the preparation which is short in period, simple, convenient and easy to industrialize is realized.

The present invention relates to a method for preparing a fluorine-doped Mo₂C nanocatalyst on a nitrogen-carbon nanosheet. This method uses a simple two-step pyrolysis method. First, two molybdenum sources are introduced, and MoO₃: ammonium molybdate = 1: (2-2.5). Then, ammonium fluoride (NH₄F) and molybdenum-dopamine (Mo-PDA) are uniformly mixed by solid-phase grinding. After calcination, the anion fluorine is doped into molybdenum carbide and modifies it, and then the fluorine-doped Mo₂C nanocatalyst on the nitrogen-carbon nanosheet can be obtained. The catalyst obtained by the present invention has higher catalytic activity, cyclic stability and hydrogen production efficiency in the reaction of electrolyzing water under alkaline conditions, and has the advantages of simple synthesis process, simple operation and short synthesis cycle.

The invention discloses a hydrogenation catalyst as well as a preparation method and application thereof. The hydrogenation catalyst comprises a carrier and active metal components, the carrier is a core-shell carrier, a core layer is alumina, a shell layer is alumina containing molybdenum carbide, and the active metal components comprise at least one of VIII group metal oxides and at least one of VIB group metal oxides. The catalyst can be used for hydrogenation of heavy oil, residual oil and the like, is especially suitable for a residual oil hydrogenation process, and realizes efficient hydrogenation.

The invention belongs to the technical field of lubricating oil, and particularly relates to an internal combustion engine oil composite additive and a preparation method and application thereof. The internal combustion engine oil composite additive is prepared from the following raw materials in percentage by mass: 5 to 25 percent of sulfonate, 5 to 12.5 percent of an oxidation and corrosion inhibitor, 5 to 12.5 percent of an anti-wear agent, 5 to 10 percent of an antioxidant, 1 to 2.5 percent of heptadecenyl imidazoline succinate, 0.5 to 1 percent of a nano compound and the balance of a dispersing agent, the nano compound is a compound of nano molybdenum carbide and nano aluminum oxide. Lubricating oil adopting the internal combustion engine oil composite additive has good wear resistance, water resistance and corrosion resistance, meanwhile, good low-temperature fluidity and low loss, oxidative deterioration of engine oil and generation of sediments can be effectively inhibited, the low-speed preignition frequency of an engine can be reduced, and the service life of the engine oil is prolonged. Timing chain abrasion protection and valve system abrasion protection are provided for an engine.

The invention relates to the technical field of semiconductor materials, and particularly discloses a flexible flow guide ring, a preparation method and a silicon carbide crystal growth method applying the flexible flow guide ring. The flexible flow guide ring comprises any one or more of tantalum carbide, tungsten carbide, molybdenum carbide, niobium carbide and zirconium carbide. The preparation method of the flexible flow guide ring comprises the following steps: placing a flexible flow guide ring blank in heat treatment equipment containing silicon carbide powder or carbon powder, vacuumizing, filling argon, carbonizing, and obtaining the flexible flow guide ring after carbonization is finished. The silicon carbide crystal growth method using the flexible flow guide ring comprises the following steps: assembling the flexible flow guide ring and a crucible containing silicon carbide seed crystals and silicon carbide powder, transferring the crucible to a single crystal growth furnace after the assembly is completed, growing the silicon carbide crystals by using a PVT method, and obtaining the high-quality silicon carbide crystals after the growth is completed. The problems of crystal defects and flow guide ring cracking in the growth process of the silicon carbide crystal can be reduced.

The invention discloses a liquid-phase laser preparation method of a molybdenum carbide carrier loaded metal composite material, which comprises the following steps: firstly, based on a liquid-phase pulse laser corrosion technology, corroding an elemental Ag or Au target material in acetone to obtain uniformly dispersed Ag or Au nanoparticles coated with 1-2 carbon layers, and in the process, the size distribution of the metal nanoparticles is uniform and adjustable; and performing in-situ carbonization on the oxide MoO3 powder in a high-carbon reduction liquid phase environment (acetone) by using a pulse laser irradiation technology to convert the oxide MoO3 powder into MoC nanoparticles. And finally, irradiating the mixed solution of the metal nanoparticles and MoC by using laser with the wavelength of 355 nm to prepare a series of composite materials such as Ag-coated MoC or Au-coated MoC and the like. According to the method, the traditional metal-doped molybdenum carbide process is improved, no other chemical reagents such as surfactants and stabilizers need to be added, and generation of other impurity products is avoided. The method is simple to operate, green, efficient and high in universality.

The application provides a molybdenum-based monolithic catalyst, a preparation method and application thereof, and the preparation method comprises the following steps: S1, providing an electrically conductive carbon carrier and pretreating; S2, mixing a molybdenum-based precursor and a high-molecular alcohol substance in water to form a stable impregnation liquid system; S3, placing the pretreated electrically conductive carbon carrier into the impregnation liquid system, ultrasonic impregnating, and then drying to obtain a catalyst precursor; and S4, calcining the catalyst precursor under an inert gas to obtain the molybdenum-based monolithic catalyst. The application adopts a modified impregnation liquid to replace a traditional modified carrier strategy, improves the wettability of the impregnation liquid to the hydrophobic electrically conductive carbon carrier, and ensures the uniform distribution of the molybdenum-based active component on the electrically conductive carbon carrier. In addition, a core-shell high-activity catalytic structure of MoO2 core-molybdenum carbide shell is constructed, which can synergistically significantly improve the catalytic activity and stability.

The invention belongs to the field of new energy materials and technologies, and particularly relates to a non-noble metal difunctional electrolyzed water catalyst and a preparation method and application thereof. According to the non-noble metal bifunctional electrolyzed water catalyst, foam metal serves as a matrix, molybdenum carbide, iron-cobalt layered double hydroxides or derivatives of the iron-cobalt layered double hydroxides are evenly loaded on the matrix, and the molybdenum carbide and the iron-cobalt layered double hydroxides or the derivatives of the iron-cobalt layered double hydroxides are in contact doping to generate FeCoMo nano-particle heterojunctions in irregular shapes. The preparation process of the non-noble metal bifunctional water electrolysis catalyst is simple, the production cost is reduced, the production efficiency is improved, the performance of the catalyst is improved, and a more efficient, economical and environment-friendly catalyst solution is provided for hydrogen production through water electrolysis.

The application provides a method and application for reducing molybdenum trioxide to generate molybdenum dioxide or molybdenum carbide, which comprises the following steps: dispersing MoO3 powder in a mixed solution of monohydric alcohol and polyhydric alcohol, adding a triblock copolymer P123 stabilizer, and obtaining a suspension which is subjected to microwave-assisted solvothermal reaction, centrifugation or filtration and washing, and then brown H 0.93 The MoO3 / C precursor microspheres are placed in an argon plasma environment and calcined at a high temperature of 500-600 DEG C for 30-60 min to obtain brown-black MoO2 / C microspheres; or the H 0.93 The MoO3 / C precursor is placed in a hydrogen-argon plasma environment and calcined at a high temperature of 500-600 DEG C for 30-60 min to obtain gray Mo2C / C microspheres. The MoO2 / C and Mo2C / C materials prepared by the application have nanocrystalline characteristics and excellent electrochemical performance, and have a good commercial application prospect as negative electrode materials of lithium batteries.

Methods for depositing molybdenum-containing films on a semiconductor substrate are described. The substrate is exposed to a bis(arene)molybdenum (0) precursor and a halide-free reactant to form the molybdenum-containing film (e.g., molybdenum metal (elemental molybdenum), molybdenum carbide, molybdenum carbonitride, molybdenum silicide, molybdenum carbosilicide, molybdenum sulfide, molybdenum carbosulfide, molybdenum nitride, molybdenum phosphide, or molybdenum carbophosphide. The exposures can be sequential or simultaneous.

A composite catalyst for electrochemical hydrogenation (ECH) of furfural (FF) to 2-methylfuran (MF) includes Molybdenum Mxene and carbon nitride. In an example, the composite catalyst is two dimensional (2D)-on-2D Mo3C2@g-C3N4. By performing the ECH of FF with the composite catalyst in a mild electrolyte solution and enabling the selective production of MF at particular applied potentials, the composite catalyst minimizes challenges commonly associated with conventional ECH methods. The structure of the composite catalyst, in which Molybdenum sites act as active centers and nitrogen facilitates the hydrogenation of FF, enables direct hydrogenation of FF to MF, thereby increasing selectivity and efficiency. The composite catalyst shows a high preference for FF reduction over HER, significantly increasing the faradaic efficiency (FE). The Molybdenum Mxene can be Molybdenum carbide. In an example, an amount of Molybdenum Carbide in the composite catalyst is between about 5 and about 10 mass percent.