53results about How to "Limit reunion" patented technology

The invention provides a nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst and a preparing method and application thereof. The preparing method includes the following steps that a coprecipitation method is used for preparing a SEP compound material from a surfactant and heteropolyacid or polyoxometalate, the surfactant is a cationic surfactant or ionic liquid surfactant, and the heteropolyacid or polyoxometalate contains molybdenum or tungsten; the SEP compound material, melamine and phytic acid are used as raw materials for synthesizing a SEP-MA-PA compound material through a mixing and dissolving method; under protection of inert gas, the SEP-MA-PA compound material is subjected to heat treatment and cooled to obtain the nitrogen-phosphorus codopedcarbon loaded molybdenum carbide or tungsten carbide catalyst. Nanoparticles of the nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst are small in size and areof a porous structure, by means of nitrogen-phosphorus heteroatom doping, the conductivity of the catalyst is enhanced, and the catalyst has efficient performance of electrolyzing water for preparinghydrogen.

The invention discloses a method for preparing nano Ag/polymer antimicrobial film by utilizing <60>Co-gama ray or electronic beam irradiation. The method comprises the steps of: dissolving an NVP (N-vinylpyrrolidone) monomer in one or any two of ethanol, methanol, water and acetone, then adding AgNO3 solution, evenly stirring, putting a polymer film into the mixed solution, vacuumizing, irradiating in a closed reaction container, taking out the polymer film, washing with water and drying to obtain the nano Ag/polymer antimicrobial film. No initiator or reductant needs to be added in the irradiation process, NVP is polymerized on the surface of the polymer when Ag<+> is reduced into nano Ag, the method has the advantages that the technology is simple, the process is controllable, the yield is high, the prepared nano Ag/polymer antimicrobial film has good hydrophilicity and safety, the antimicrobial rate to Escherichia coli 107CFU/ml in 24 hours can reach 97.7%-100%.

A method for preparing tungsten-molybdenum alloy by doping beneficial elements comprises the following steps: preparing doped molybdenum powder; preparing doped tungsten powder; and preparing the tungsten-molybdenum alloy through 82-87.5% of doped molybdenum powder, 11-15% of doped tungsten, and 1.5-3.0% of vanadium oxide. The tungsten-molybdenum alloy prepared by the method is outstanding in high-temperature creep resistance and tensile strength, and high in low-temperature strength; after being plastically deformed, lanthanum oxide and praseodymium oxide are dispersed into fine second-phase particles under high temperature and are regularly arranged, so that the strengthening effect can be achieved.

The invention relates to a metal catalyst which comprises: 1) a nano TiO2 modified porous material as a composite carrier, and 2) a nano particle of at least one out of Pd and other transition metals as an active component, wherein the active component and TiO2 in the composite carrier have strong metal-carrier interaction to form a Pd@TiO2 structure or a Pd-M@TiO2 structure, thereby forming the Pd-M@TiO2/porous carrier catalyst, and M is at least one out of the transition metals except Pd. The invention further relates to a preparation method of the catalyst, and an application of the catalyst in preparing cyclohexanone through selective phenol hydrogenation.

The invention discloses a forming method of a metal base carbon nanotube composite material part. The forming method comprises the following steps: (1) metal powder and a carbon nanotube are preheatedto obtain a metal base carbon nanotube composite material; (2) program files and SLM equipment are prepared; and (3) when the oxygen volume content of a forming chamber is not more than 0.1%, according to the program files and forming process parameters, selective melting is started for gradual stacking to form the needed part. The forming method uses a selective laser melting technology for layer-by-layer melting to improve dispersibility of the carbon nanotube in a metal matrix; due to high cooling speed, the interface reaction of the carbon nanotube and the metal matrix and the element segregation are reduced; through control of core process parameters, the stability of forming the metal base carbon nanotube composite material is improved; the compactness of the formed material can reach above 99.8%; a complicated part can be directly formed; the production period is shortened; the forming efficiency is improved; and higher production and application value is achieved.

The invention discloses a method for preparing an olefin compound based on a catalyst obtained by compounding carbon tubes and transition metals. The method comprises the following steps: preheating and vaporizing an alkane compound, mixing the compound with carrier gas, and carrying out a dehydrogenation reaction in a reactor under the action of a catalyst; and collecting the olefin compound after condensation, wherein the catalyst contains 5-30wt% of transition metals/transition metal oxides and 70-95wt% of carbon tubes. The method is used for preparing aliphatic olefin compounds and aromatic olefin compounds, the catalyst compounded based on the carbon tubes and transition metal elements/transition metal oxides is stable to water, air and heat, the catalytic activity is invariable after the continuous experiment of over 150 hours, continuous operation can be realized, activation is not needed, and the catalyst is economic and convenient. According to the method disclosed by the invention, when the catalyst is applied to ethylbenzene gaseous phase direct dehydrogenation so as to prepare styrene, the conversion rate of the alkane compound is not less than10 percent, and the selectivity of the olefin compound can be more than or equal to 97 percent.

The invention relates to a preparation method of a carbide-loaded noble metal monatomic catalyst, and belongs to the technical field of electro-catalytic materials. The technical problems of high preparation cost and low metal utilization rate of a noble metal catalyst for an electrochemical hydrogen production reaction at present are solved. In the synthesis process of a metal organic framework precursor, noble metal ions are introduced to be complexed with heteropolyacid and embedded into an organic framework pore channel in a self-assembly mode, and the precursor is subjected to high-temperature heat treatment and acid etching to obtain the carbide-loaded noble metal monatomic catalyst. The result shows that the loaded noble metal is uniformly dispersed on the carbide nanoparticles in a monatomic form. The catalyst shows good activity in alkaline electrochemical hydrogen evolution reaction. The preparation process of the catalyst is simple and easy to implement, the utilization rate of precious metal is remarkably increased, the cost of the electrocatalyst is effectively reduced, and the catalyst has wide application prospects.

The invention relates to a method for preparing a polyurethane-nano silver long-lasting antimicrobial film by a modification method after ultraviolet-irradiation. The method comprises the steps: (1) conducting a mixed reaction of diisocyanate and polytetrahydrofuran; adding an acetone solution containing a cross-linking agent and a chain extender, adding dimethylol propionic acid and a catalyst to react, and obtaining PU; adding a dimethylformamide solution of silver nitrate to a polyurethane solution, stirring evenly to form a film, conducting heat treatment, and obtaining a polyurethane-nano silver film; (2) reacting 4,4'-dihydroxybenzophenone with long chain haloalkane, and obtaining 4,4'-double-long chain alkoxy benzophenone; reacting the 4,4'-double-long chain alkoxy benzophenone with hydrazine hydrate, and obtaining 4,4'-double-long chain alkoxy benzophenone hydrazone; conducting oxidizing reaction on the 4,4'-double-long chain alkoxy benzophenone hydrazone, and obtaining long chain alkyl diazomethane; (3 ) dissolving the long-chain alkyl diazomethane in solvent, spraying on the surface of the polyurethane-nano-silver film, after ultraviolet-irradiation, and obtaining the product. The invention can achieve long-term anti-microbial.

The invention provides a method for preparing nanometer silicon carbide at a low temperature. The method adopts the 'double confinements' process and comprises the following steps: firstly preparing asilicon dioxide/carbon compound through the pyrolysis of a silicon dioxide/polymer compound; then mechanically mixing the obtained compound with magnesium metal/calcium and performing thermal treatment in a closed reactor; finally sequentially cleaning with hydrochloric acids and hydrofluoric acids to obtain the nano-structured SiC. In a synthetic route, a carbon skeleton in the silicon dioxide/carbon compound provides a first confinement effect to confine the growth of the nanometer silicon carbide, and the closed reactor provides a second confinement effect to reduce the carbothermal reduction temperature. The nanometer silicon carbide prepared by the method has large specific surface area and abundant porosity, can load a metallic silver catalyst as a carrier and is used for a lithiumion battery anode material. The method for preparing the nanometer silicon carbide, provided by the invention, is simple in process and convenient for realization of large-scale production.

The invention discloses a PPy/GO composite electrode and a preparation method and application thereof, and belongs to the technical field of capacitive deionization. According to the preparation method of the PPy/GO composite electrode, a foamed nickel substrate is used as a current collector, firstly a pyrrole monomer is dissolvoed in a sodium dodecylbenzenesulfonate (SDBS) solution, then a graphene oxide dispersion solution is added, a mixture is ultrasonically dispersed and fully stirred, a PPy/GO composite coating is formed on the foamed nickel current collector by a one-step anodic electrochemical co-deposition method, and the mixture is washed and dried to prepare the PPy/GO composite electrode. The method for preparing the electrode material is simple, operable and reproducible, andis suitable for mass production. The synergistic action of GO and PPy enables the conductivity of the electrode material to be significantly improved while more adsorption sites are given for the electrode material, and the capacitive properties and absorption and desorption properties of the electrode material are further improved.

The invention discloses a preparation method for a nanoscale base material of a crude oil pourpoint depressant and belongs to a crude oil pourpoint depressant and the technical field of the crude oil pourpoint depressant. In the method, a thermal weight loss test, a crystallization property test, an X-ray diffraction test, a powder particle size test, a water content test and a viscosity test in which a compounding agent formed by the nanoscale base material of the crude oil pourpoint depressant is added into the crude oil are adopted, wherein polar groups are grafted to the surfaces of inorganic nanoparticles; when results of the thermal weight loss test, the crystallization property test, the X-ray diffraction test, the powder particle size test and the water content test are considered to be qualified, the nanoscale base material of the crude oil pourpoint depressant is considered to be qualified. As the nanoscale base material of the crude oil pourpoint depressant is considered to be qualified by testing, the self-aggregation easily generated by the nanoscale base material of the crude oil pourpoint depressant is limited; the originally owned performance can be fully played.

The invention provides a regeneration method for a deactivated transition metal catalyst. The method includes the steps of (1) roasting the deactivated catalyst in an oxygen-containing gas; (2) carrying out purging with a protective gas to replace the oxygen-containing gas; (3) introducing a reducing gas for a reduction reaction to obtain a regenerated catalyst. By adopting the high-temperature solid-phase reaction and controlled reduction strategies, carbon deposition can be eliminated to realize regeneration of the catalyst deactivated by carbon deposition, and meanwhile agglomerated metal nanoparticles can be dispersed again to realize regeneration of the catalyst deactivated by metal sintering. The method is easy and convenient to implement and high in regeneration efficiency, the catalyst can be repeatedly regenerated, the carbon deposition and sintering resistance of the regenerated catalyst is improved, and the service life of the regenerated catalyst is prolonged.

The invention provides a preparation method of a high-transmission composite Ag film. The preparation method comprises the following steps that glass base plate pretreatment is carried out; a TiO2 film is prepared, specifically, a radio frequency magnetron sputtering method with the sputtering power of 120W - 140 W is adopted, a deposition chamber is vacuumized, a TiO2 target is adopted, working gas is a mixed gas of oxygen and argon, and annealing is carried out after deposition; a Cr-containing Ag film is prepared, specifically, a pure Ag target embedded with a chromium slice is used, the Cr-containing Ag film is deposited through vacuum magnetron sputtering, the sputtering power is 30W - 50 W, and sputtering gas is argon; and the TiO2 film is prepared again. According to the composite Ag film prepared by the preparation method, a TiO2 / Ag (Cr) / TiO2 multilayer structure has low resistance and high optical transmittance.

The invention discloses a ruthenium and nitrogen co-doped porous carbon catalyst as well as a preparation method and application thereof in hydrogen evolution by electrolysis. The catalyst is prepared by taking ethylenediamine tetraacetic acid salt as a ligand and a carbon source, preparing a ruthenium complex precursor by combining with ruthenium salt, and then performing high-temperature pyrolysis on the ruthenium complex precursor to obtain a target product. The catalyst provided by the invention has efficient hydrogen evolution activity and lasting stability, and has a wide application prospect.

The invention relates to a biomass waste residue-based monatomic metal catalyst and a preparation method and application thereof, the preparation method comprises the following steps: 1) drying, crushing and sieving biomass waste residues to obtain waste residue powder, and then performing oxygen-limited pyrolysis to obtain biomass charcoal; 2) mixing the biomass charcoal with a potassium hydroxide solution, stirring, drying, and carrying out secondary pyrolysis under a limited oxygen condition to obtain porous charcoal; and 3) dissolving the metal precursor and o-phenanthroline in an organic solvent, then adding the porous carbon, stirring, then drying to obtain powder, uniformly mixing the powder with a cyanamide compound, and sintering in a protective atmosphere. Compared with the prior art, the biomass waste residue-based monatomic metal catalyst prepared by taking the porous carbon prepared by pyrolyzing the biomass waste residues as the carrier shows excellent activity and stability, can meet the requirements of application and development in related fields, and particularly has high oxidation activity on organic pollutants.

The invention discloses a preparation method of a cathode material of a lithium ion battery and a related product thereof. The method comprises the steps of selecting a piece of metal foil as a current collector, preprocessing the metal foil, and cleaning the surface of the metal foil; attaching a porous nano template to the surface of the preprocessed metal foil; depositing SnO2 by using a pulsedlaser deposition system; carrying out annealing treatment; and removing the porous nano template to obtain a SnO2 nano pillar array on the metal foil. The method adopts pulsed laser deposition to prepare the cathode material of the lithium ion battery, agglomeration of products can be well limited, introduction of impurities is avoided, and thus the method has the advantages of simple preparationprocess, reliable process and the like; meanwhile, the prepared highly-ordered SnO2 nano pillar array material has the advantages of clear interface, complete structure and the like; and when the prepared material is used as the cathode material of the lithium ion battery, an efficient electron transmission channel can be provided, and most importantly, volume expansion can be effectively relieved in the charging and discharging process, thus the cycle performance of the battery is improved, and the service life of the battery is prolonged.

The invention discloses a defect type TNTs composite material capable of achieving magnetic separation and a preparation method thereof. P25, a water-soluble divalent iron salt and a trivalent ferriciron salt are used as raw materials, and Fe3O4 nanoparticles grow in situ on TiO2 nanotubes (TNTs) under an alkaline hydrothermal condition to synthesize the defect type TNTs composite material capable of achieving magnetic separation. The prepared Fe3O4-TNTs nanocomposite material capable of achieving magnetic separation has a good magnetic property, the saturation magnetization strength is 22.60emu/g, and the separation and recovery of the composite material can be achieved; when illumination is carried out for 120 minutes, the removal rate of methylene blue by the magnetic Fe3O4-TNTs nanocomposite material is 99.67%, and the prepared defect type TNTs composite material capable of achieving magnetic separation has excellent adsorption performance, photocatalytic activity and magnetism and can be separated and recovered through an externally applied magnetic field.