26 results about "Molybdenum hexacarbonyl" patented technology

The invention discloses a preparation method and application of a molybdenum monatomic photocatalyst for producing ammonia through nitrogen reduction, and belongs to the technical field of photocatalytic material preparation. According to the preparation method, molybdenum hexacarbonyl is taken as a metal precursor, and molybdenum single atoms are introduced into a covalent organic framework material sp2c-COF by adopting a solvothermal synthesis method, so that the covalent organic framework photocatalyst is obtained; according to the covalent organic framework photocatalyst, molybdenum single atoms are anchored, the local coordination environment of a covalent organic framework is finely controlled, the unique electronic structure and catalytic activity of the molybdenum single atoms can effectively optimize electron cloud distribution of COFs, the adsorption and activation capacity on nitrogen molecules is enhanced, and the covalent organic framework photocatalyst has the advantages that the covalent organic framework photocatalyst is high in catalytic activity and high in catalytic activity; the covalent organic framework photocatalyst can effectively inhibit the compounding of photo-induced electron-hole pairs so as to prolong the service life of photo-induced electrons, so that the covalent organic framework photocatalyst has excellent ammonia production performance, and the ammonia production activity can reach 372.6 [mu] mol.g <-1 >. H <-1 > under the conditions of visible light and pure water.

The invention belongs to the technical field of catalyst preparation, and relates to efficient preparation of clean energy, in particular to an energy-saving hydrogen production system using a binary alloy catalyst formed by rare earth elements under the assistance of ethanol. The preparation method comprises the following steps: uniformly mixing metal precursors of palladium and lanthanum, molybdenum hexacarbonyl and an n-caprylic acid solvent by adopting a wet chemical synthesis method, carrying out an oil bath reaction for a period of time, separating precipitates, and sequentially washing and drying to obtain the binary alloy catalyst. The improvement and promotion effects of ethanol on a traditional water electrolysis hydrogen production system are researched in an H-shaped electrolytic tank, and it is proved that ethanol-assisted hydrogen production is an efficient and energy-saving hydrogen production mode. The preparation method of the catalyst is simple, has few steps and is simple and convenient to operate. Compared with a Pd metal alkene catalyst and commercial Pd black, the catalyst provided by the invention has more excellent catalytic activity and stability. The hydrogen production mode is more efficient, and energy consumption is greatly reduced.

The invention provides a preparation method of a molybdenum boron ion modified and cesium doped Li-Al hydrotalcite solid electrolyte, in the process of Cs < + > doped Li-Al hydrotalcite, a part of lithium ions are replaced by cesium ions, resulting in the change of lattice parameters, the introduction of boron, and the expansion of the space between hydrotalcite layers, so that the stability of the electrolyte is improved. The interlayer spacing is increased, a non-uniform pore structure is formed to promote ion movement, amino groups introduced through ammonia gas treatment and allyl boronic acid pinacol ester are subjected to an amino-acrylic acid addition reaction, functional groups of hydrotalcite are increased, plasma treatment is carried out by using molybdenum hexacarbonyl steam, and the surface area of the hydrotalcite is increased. Boron ions and molybdenum ions are injected into the electrolyte sheet, the mechanical strength and chemical stability of the material are enhanced, meanwhile, a new electrochemical active center is introduced for hydrotalcite, and the electrochemical performance of the material is improved.

The invention discloses a close-packed hexagonal-phase triangular-sheet-shaped nano-palladium catalyst and a preparation method thereof, and belongs to the technical field of nano-material preparation. According to the preparation method, palladium acetylacetonate is taken as a reactant, N, N-dimethylformamide is taken as a reaction solvent, hexadecyl trimethyl ammonium bromide is taken as a reducing agent and a crystal phase structure control agent, molybdenum hexacarbonyl is taken as a morphology control agent, and the close-packed hexagonal-phase triangular-sheet-shaped nano-palladium catalyst with regular morphology and controllable size is prepared through a simple liquid-phase thermochemical reduction method. The specific surface area of the two-dimensional sheet structure is large, the number of unsaturated atoms on the surface is large, interface charge transfer is fast, and improvement of the electro-catalytic performance is facilitated; and the triangular structure can provide more edge active sites, so that the catalytic activity can be further improved.

According to the efficient synthesis method of the amide-containing diheterocyclic compound, aryl iodide is used as a substrate, molybdenum hexacarbonyl is used as a safe carbonyl source, palladium is used as a catalyst, organic phosphine is used as a ligand, potassium carbonate is used as alkali, and indole is used as a nucleophilic reagent, so that the amide-containing diheterocyclic compound is successfully synthesized. The method adopts a one-pot method, and has the characteristics of safety and simplicity in operation, wide substrate range, good functional group compatibility, high bonding efficiency and the like. The amide-containing bis-heterocyclic compound is an important intermediate for synthesizing complex molecules such as drugs and natural products, and the method has important significance in the fields of medicines, pesticides, chemical engineering and the like.

This invention, applicable to the field of medical contrast agents, provides a method for preparing and applying ultrasmall nano-high-entropy alloys for high-energy computed tomography (CT) imaging. Using a low-temperature oil-phase strategy, the method successfully synthesizes uniformly sized, approximately 5 nm, ultrasmall nano-high-entropy alloys (HEAs) from a mixture of cetyltrimethylammonium chloride and oleylamine, with the addition of a metal source and molybdenum hexacarbonyl, at ambient pressure and temperatures not exceeding 250°C. These ultrasmall nano-HEAs can be used in high-energy CT imaging, exhibiting excellent contrast-enhanced imaging capabilities and maintaining strong X-ray attenuation across a wide range of photon energies, particularly at high photon energies. Not only does their attenuation strength surpass that of the commercial contrast agent iohexol, but they also offer a wider energy range of application, making them valuable for the noninvasive and precise detection and diagnosis of lesions.

The invention is suitable for the technical field of medical contrast agents, and provides a preparation method and application of an energy CT imaging ultra-small nano high-entropy alloy. According to the method, a low-temperature oil phase strategy is adopted, a mixed system of hexadecyl trimethyl ammonium chloride and oleylamine is taken as a basis, a metal source and molybdenum hexacarbonyl are added, and the ultra-small nano high-entropy alloy (HEAs) which is uniform in size and about 5nm is successfully synthesized under the conditions of normal pressure and no more than 250 DEG C. The ultra-small nano HEAs can be applied to energy CT (computed tomography) imaging, has excellent contrast-enhanced imaging capability, still keeps high X-ray attenuation in a large photon energy range, especially under high photon energy, has the attenuation intensity superior to that of a commercial contrast agent iohexol, has a wider energy application range, and can be applied to the field of X-ray imaging. The method has an important value for non-invasive accurate detection and diagnosis of the focus.

The invention discloses an interactive response layered superlattice nanoprobe as well as a synthesis method and application thereof, and belongs to the technical field of nanomaterials and biosensing. The nanoprobe is synthesized through a ligand regulation and control self-assembly strategy, specifically, a platinum source, n-caprylic acid and molybdenum hexacarbonyl are mixed and heated for a reaction, and after the reaction is finished, aftertreatment is conducted to obtain the interactive response layered superlattice nanoprobe. The nanoprobe has a highly-ordered layered superlattice structure, and can generate synergistic change of structure and catalytic activity under different H2O2 concentrations, so that specific interactive response to H2O2 is realized. The nanoprobe is controllable in synthesis process and stable in structure, the interactive response performance of the nanoprobe provides core material support for threshold type detection of biomarkers, the technical problems that a traditional nanomaterial is single in response to substrate concentration change and insufficient in sensitivity are solved, and the nanoprobe has important application value in the fields of biosensing, clinical detection and the like.

Use of at least one compound which, upon contact with pH-neutral water, causes a reduction in the pH value, for lowering the freezing point of water and / or aqueous solutions, wherein the compound is an inorganic acid or an acid generator selected from MoO 2 , molybdenum carbide, molybdenum nitride, molybdenum silicide, molybdenum sulfide, molybdenum hexacarbonyl, molybdenum acetylacetonate, tungsten blue oxide, WO 3 , tungsten carbide, tungsten silicide and tungsten sulfide.

This invention provides a method for the catalytic hydroboration of nitrile compounds, belonging to the field of nitrile reduction technology. The method uses nitrile compounds as substrates, molybdenum hexacarbonyl as a catalyst, and pinacolborane as a hydrogen source, with the hydroboration reaction occurring at 78-82°C for 7.5-8.5 h. The reaction utilizes molybdenum hexacarbonyl as a catalyst, which is simple and readily available, requiring no complex synthesis. Furthermore, the reaction process does not require the participation of ligands. Using pinacolborane as a hydrogen source eliminates the need for strictly nitrogen-protected experimental conditions, enabling the hydroboration of nitriles. The substrate applicability is broad, applicable not only to aromatic nitriles but also to aliphatic nitriles and even some dinitriles. The reaction process does not require solvents, making it environmentally friendly. The corresponding hydroboration product is obtained directly after the reaction without further purification, and the reaction yield is high, ranging from 84-100%.

This invention relates to a low-temperature carbon nanotube catalyst, its preparation method, and its application. The method includes: immersing alkali-free glass fibers in an acidified H₂O₂ solution, controlling the pH to 4-5, followed by reaction and washing to obtain activated alkali-free glass fibers; adjusting the pH of a 3-aminopropyltriethoxysilane / anhydrous ethanol solution to 4-5, stirring at room temperature to induce a hydrolysis reaction; immersing the activated alkali-free glass fibers in the solution to induce a condensation reaction; washing the alkali-free glass fibers to neutrality to obtain amino-modified alkali-free glass fibers; adding the amino-modified alkali-free glass fibers to an ethylene glycol mixed solution of iron acetylacetonate, cobalt acetylacetonate, and molybdenum hexacarbonyl, then adding sodium borohydride, stirring the mixture until homogeneous, and then reducing, filtering, washing, and drying to solidify. This invention reduces the erosion of the glass fiber surface by the catalyst metal during heat treatment by loading a low-temperature carbon nanotube catalyst onto the surface of the alkali-free glass fibers.

The present invention discloses a palladium-iridium-based ultrathin two-dimensional alloy nanosheet electrocatalyst and a preparation method thereof. Its general composition formula is Pd x Ir y M z , where M is selected from one or more of Pt, Mo, and Ru, x + y + z = 1, 0.3 ≤ x ≤ 0.6, 0.1 ≤ y ≤ 0.5, 0 ≤ z ≤ 0.6, and it has excellent electrocatalytic performance for hydrogen conversion. The present invention realizes the general synthesis of binary to quinary palladium-iridium-based ultrathin two-dimensional alloy nanosheets based on an oil-phase wet chemical synthesis method. Using palladium acetylacetonate, dodecacarbonyltetrairidium, platinum acetylacetonate, ruthenium acetylacetonate, and hexacarbonylmolybdenum as the precursors of each metal element, after fully pre-dissolving with a carbonyl reducing agent and an inorganic salt structure inducer in an organic solvent, slowly raise the temperature to a high temperature for reaction, and then wash and disperse to obtain a palladium-iridium-based ultrathin two-dimensional alloy nanosheet electrocatalyst with uniform size and controllable composition. This material has high intrinsic catalytic activity and excellent anti-poisoning performance, and the preparation method is simple and rapid, providing important technical support for promoting the commercialization of hydrogen energy and fuel cell catalysts.

The application discloses a selective hydrogenation reduction method of an alpha, beta-unsaturated amide compound. After mixing the alpha, beta-unsaturated amide compound, water, a metal promoter, a ligand and an organic solvent, a reduction reaction is carried out, and a reaction liquid is obtained after the reaction is completed. The alpha, beta-saturated amide compound is obtained by separating and purifying the reaction liquid through a silica gel column. The application has high yield, mild reaction condition, no irritating odor and is environment-friendly. Compared with a hexacarbonylmolybdenum, sodium, ferroferric oxide and other catalysts or promoters, the zinc powder is more inexpensive and easy to obtain. Compared with a phenylsilane and hydrazine and other hydrogen sources, the water as the hydrogen source is more easy to obtain, and the reaction condition is relatively simple.

The invention relates to the technical field of coated glass, in particular to self-cleaning low-emissivity hollow coated glass and a preparation process thereof. The invention relates to a preparation process of self-cleaning low-emissivity hollow coated glass. The preparation process comprises the following steps: preparing single-layer coated glass; preparing double-layer coated glass; preparing three layers of coated glass; preparing modified sericite powder and modified talcum powder; and preparing the hollow coated glass. The preparation method comprises the following steps: firstly dissolving tin tetrachloride pentahydrate, then adding molybdenum hexacarbonyl and neodymium chloride hexahydrate, fully stirring and dissolving to prepare precursor sol, then uniformly coating the precursor sol on the surface of a yttrium-doped zinc oxide coating of single-layer coated glass, and calcining to form a neodymium-molybdenum co-doped tin dioxide coating, so that the carrier concentration and mobility can be improved; and an infrared light absorption path is destroyed, and energy loss is reduced, so that the infrared reflection effect is further enhanced, and the radiance of the hollow coated glass is reduced.

The application discloses a kind of MOCVD preparation method and device of wafer level single crystal molybdenum disulfide;The preparation method uses six carbonyl molybdenum Mo (CO) 6 and liquid carbon disulfide CS2 as molybdenum source and sulfur source respectively, different from traditional MOCVD growth process, precursor used in the application does not contain hydrogen element, avoid the side effect caused by hydrogen element, and increase the pre-reaction of source cracking, by introducing oxygen, generate intermediate product molybdenum trioxide (MoO3) and sulfur element (S) in pre-reaction chamber, to the reaction chamber on the substrate surface deposition, effectively avoid the introduction of carbon impurities, realize the nucleation and epitaxial growth of single crystal orientation on the substrate surface, obtain high uniformity and continuity single crystal molybdenum disulfide film, realize 6 inch and above size single crystal wafer scale preparation, meet the key needs of high density, high performance electronic device integration.

The invention relates to a low-temperature carbon nanotube catalyst as well as a preparation method and application thereof. The method comprises the following steps: immersing alkali-free glass fibers in an acidified H2O2 solution, controlling the pH value to be 4-5, reacting and cleaning to obtain activated alkali-free glass fibers; the method comprises the following steps: adjusting the pH value of a 3-aminopropyltriethoxysilane / absolute ethyl alcohol solution to 4-5, stirring at normal temperature, and carrying out hydrolysis reaction; immersing the activated alkali-free glass fiber in the solution, and carrying out condensation reaction; washing the alkali-free glass fiber to be neutral to obtain amino-modified alkali-free glass fiber; the preparation method comprises the following steps: adding amino-modified alkali-free glass fibers into an ethylene glycol mixed solution of ferric acetylacetonate, cobalt acetylacetonate and molybdenum hexacarbonyl, then adding sodium borohydride, uniformly stirring the mixed solution, reducing, filtering, washing, drying and curing. The low-temperature carbon nanotube catalyst is loaded on the surface of the alkali-free glass fiber, so that corrosion of catalyst metal to the surface of the glass fiber in the heat treatment process is reduced.

The invention provides a method for catalyzing the hydroboration reaction of nitrile compounds, which belongs to the technical field of nitrile reduction, the nitrile compounds are used as a substrate, molybdenum hexacarbonyl is used as a catalyst, pinacolborane is used as a hydrogen source, and the hydroboration reaction is carried out at 78-82 DEG C for 7.5-8.5 hours. Molybdenum hexacarbonyl is used as a catalyst in the reaction and is simple and easy to obtain, complex synthesis is not needed, and in addition, ligand participation is not needed in the reaction process; according to the method, pinacolborane is used as a hydrogen source, the reaction process does not need strict nitrogen protection experiment conditions, the nitrile hydroboration is realized, the substrate application range is wide, and the reaction is not only suitable for aromatic nitrile, but also suitable for fatty nitrile and even some dinitrile; in the reaction process, no solvent is needed, and the method is environment-friendly; after the reaction is finished, a corresponding hydroboration product can be obtained without further purification, and the reaction yield is high and is 84-100%.

The invention discloses a molybdenum-doped iridium-based composite catalyst for water electrolysis and a preparation method of the molybdenum-doped iridium-based composite catalyst, and belongs to the technical field of hydrogen production by water electrolysis. The catalyst comprises an active component and a carbon matrix, and has a porous nanostructure, the chemical general formula of the active component is IrxMo (1-x) O2, and x is 0.1-0.5. The preparation method comprises the following steps: taking chloroiridic acid and molybdenum hexacarbonyl as precursors, and carrying out blending, three-stage hydrothermal reaction, cooling purification, drying and carbonization treatment to obtain the molybdenum-doped iridium-based composite catalyst for electrolyzed water. The catalyst has high specific surface area, excellent conductivity and structural stability, shows excellent oxygen evolution reaction activity and durability in an acidic electrolyte, and is suitable for a proton exchange membrane electrolysis water system. The method is controllable in process and good in repeatability, and a new way is provided for development of low-cost and high-performance electrolyzed water catalysts.

The invention belongs to the technical field of catalyst preparation, and relates to a bowl-shaped binary PtCo bimetallic catalyst, in particular to a preparation method and application of bowl-shaped binary PtCo bimetallic. The preparation method comprises the following steps: uniformly mixing precursors of two metals in an n-caprylic acid solution containing molybdenum hexacarbonyl by adopting a one-step synthesis method, carrying out an oil bath reaction for a period of time, separating precipitates, and sequentially washing and drying to obtain the bowl-shaped binary bimetallic catalyst. The preparation method disclosed by the invention is simple, few in steps and simple and convenient to operate. The prepared bowl-shaped binary PtCo bimetallic catalyst has excellent catalytic activity and stability in the aspect of electro-catalysis glycerol oxidation in an alkali environment.

The application discloses a preparation method of RuMo nanoflower and application thereof, and comprises the following steps: (1) dissolving ruthenium trichloride trihydrate in an organic solvent; (2) dispersing polyvinylpyrrolidone and molybdenum hexacarbonyl in the organic solvent; (3) mixing materials obtained in steps (1) and (2), and ultrasonic dispersing at room temperature, then carrying out programmed temperature rising, rising to 180 DEG C within 30 min, and cooling to room temperature after heat preservation reaction for 1-3 h; (4) centrifugally cleaning the material obtained in step (3) with a mixed solution of acetone and ethanol, and the RuMo nanoflower is obtained; the organic solvent is benzyl alcohol or ethylene glycol. The application has simple synthesis, high biosafety of the prepared RuMo nanoflower, good enzyme catalytic activity and good photo-thermal performance.

The present invention discloses a preparation method of a palladium nanosheet electrode catalyst supported on titanium carbide in the field of electrocatalytic technology, aiming to solve problems such as the aggregation and stacking of two-dimensional palladium nanostructures and the hindrance of the synergistic effect between the substrate and palladium metal in the prior art. It includes: preparing a reaction precursor of titanium carbide nanosheets; adding the reaction precursor of titanium carbide nanosheets into a 1-methyl-2-pyrrolidone solution, and performing ultrasonic dispersion to obtain a mixed solution I; adding polyvinylpyrrolidone and hexacarbonylmolybdenum into the mixed solution I, and performing ultrasonic mixing to obtain a uniform mixed solution II; adding palladium acetylacetonate into the mixed solution II, uniformly mixing and then adding acetic acid, and performing an oil bath reaction to obtain a black precipitate, followed by centrifugal washing and freeze-drying to obtain a palladium nanosheet / titanium carbide catalyst. The palladium nanosheet electrode catalyst supported on titanium carbide prepared by the present invention has a large specific surface area and a high electron mobility, and can effectively improve the electrocatalytic activity.

The invention discloses a selective hydrogenation reduction method of an alpha, beta-unsaturated amide compound, which comprises the following steps: mixing the alpha, beta-unsaturated amide compound, water, a metal accelerator, a ligand and an organic solvent, carrying out reduction reaction to obtain a reaction solution, and carrying out silica gel column separation and purification on the reaction solution to obtain the alpha, beta-unsaturated amide compound. The method is high in yield, mild in reaction condition, free of pungent smell and environmentally friendly, zinc powder is cheaper and easier to obtain compared with catalysts or accelerators such as molybdenum hexacarbonyl, sodium and ferroferric oxide, water serving as a hydrogen source is easier to obtain compared with hydrogen sources such as phenylsilane and hydrazine, and the reaction condition is simple.

Provided is a process for the vapor deposition of molybdenum or tungsten, and the use of molybdenum hexacarbonyl (Mo(CO)6) or tungsten hexacarbonyl (W(CO)6) for such deposition, e.g., in the manufacture of semiconductor devices in which molybdenum-containing or tungsten-containing films are desired. In accordance with one aspect of the invention, molybdenum hexacarbonyl (Mo(CO)6) has been found in vapor deposition processes such as chemical vapor deposition (CVD) to provide low resistivity, high deposition rate films in conjunction with a pulsed deposition process in which a step involving a brief pulse of H2O is utilized. This pulsing with H2O vapor was found to be effective in reducing the carbon content of films produced from Mo(CO)6-based CVD processes.

The invention belongs to the technical field of preparation of metal organic compounds, and particularly relates to a preparation method and device of molybdenum hexacarbonyl. The preparation method comprises the following steps: S1, introducing molybdenum powder and carbon monoxide into a reaction device, and carrying out catalytic reaction under the action of a catalyst to generate crude molybdenum hexacarbonyl; s2, cooling the crude molybdenum hexacarbonyl product to obtain liquid molybdenum hexacarbonyl; s3, carrying out reduced pressure distillation on the cooled liquid molybdenum hexacarbonyl; and S4, purifying the liquid molybdenum hexacarbonyl after reduced pressure distillation to obtain the final product molybdenum hexacarbonyl. The preparation device comprises a storage tank, a purifier, a reaction kettle, a condenser, a reduced pressure distillation tower and a recrystallization device which are sequentially arranged along the material flow direction. According to the method, the high-purity molybdenum is prepared through the reduction reaction of the carbon monoxide and the molybdenum powder at the high temperature, and the method has the advantages of being high in raw material purity, accurate in reaction temperature control, high in reaction efficiency and the like, and is particularly suitable for high-quality production of the molybdenum.

The present invention discloses an intermetallic NiMo alloy catalyst and a preparation method and application thereof. The catalyst is prepared by a liquid phase synthesis method: nickel acetylacetonate and molybdenum hexacarbonyl are used as precursors and prepared into a solution with a complexing agent; then reacted to obtain a NiMo alloy with an alloy structure. The alloy is used for partial oxidation of methane to achieve high activity and high selectivity to partially oxidize methane to produce synthesis gas, and has broad application potential in the field of methane reforming to produce hydrogen.

The invention discloses a hydrothermal synergistic reduction preparation method of a PtMoNi entropy alloy catalyst with high ammoxidation activity, and relates to the field of new energy materials.The hydrothermal synergistic reduction preparation method comprises the steps that platinum acetylacetonate, nickel acetylacetonate, molybdenum hexacarbonyl, glucose, hexadecyl trimethyl ammonium chloride and carbon black are mixed, N, N-dimethylformamide is added, the mixture is placed in a hydrothermal kettle for staged heating, and the mixture is cooled to room temperature; cooling, centrifugally washing to obtain a sample, drying the sample in a vacuum drying oven to obtain a catalyst Pt4Mo4Ni1 / C, and performing temperature control and reduction on a precursor and uniform nucleation by utilizing CO and glucose released by molybdenum hexacarbonyl in a heating process; cTAC regulates and controls particle growth through micelle confinement, so that the PtMoNi ternary medium-entropy alloy catalyst is uniformly distributed in the form of nanoparticles; the PtMoNi ternary entropy alloying structure optimizes the adsorption and desorption behaviors of * NHx and * OH, inhibits the strong adsorption of * N on the surface of Pt, reduces the kinetic adsorption energy of AOR, and realizes the ammoxidation performance and stability.