772 results about "Nitrogen atmosphere" patented technology

The invention belongs to the technical field of superfine tungsten powder, and particularly relates to superfine tungsten powder and a preparation method thereof.The preparation method includes the steps that an ammonium tungstate solution, hydrochloric acid and carbon black serve as raw materials to prepare a mixture of tungstic acid and a carbon precursor; calcining the tungstic acid and carbon precursor mixture in a nitrogen atmosphere to obtain a tungsten oxide and carbon mixture; a tungsten oxide and carbon mixture is calcined in an argon atmosphere, the argon atmosphere is kept for natural cooling, the superfine tungsten powder is obtained, the superfine tungsten powder is uniform in dispersion, complete in grain development, smooth in surface, free of pores and complex in morphology, the crystal structure of the superfine tungsten powder is a body-centered cube, the average particle size is smaller than or equal to 0.7 micrometer, and the specific surface area is smaller than or equal to 1.0 m < 2 > / g.

The invention belongs to the technical field of nickel electrode slurry preparation, discloses a preparation process of ultra-fine particle size roll-printed nickel electrode slurry for an ultra-high capacity MLCC, and aims to solve the problems that in the prior art, ultra-fine nickel powder is easy to oxidize, the cost of covering nickel nitride powder is high, a covering layer is easy to damage and agglomerate during dispersion, and the performance of the slurry is poor. The method comprises three steps of raw material pretreatment, synchronization of material dispersion and nitridation, post-treatment and nitrogen protection, wherein the pretreatment is used for removing impurities and preventing oxidation, dispersion and nitridation are carried out synergistically through a sand mill and an ultrahigh-pressure homogenizer in a graded regulation and control mode, the post-treatment comprises filtering, inspection and double-layer vacuum packaging, the raw materials are prepared according to a specific proportion, key parameters are precisely regulated and controlled, and finally the slurry is prepared. Roll printing adaptability and co-firing requirements are met, independent nitridation and reduction procedures are omitted, cost is reduced, slurry uniformity, dispersion stability and MLCC reliability are improved, and large-scale mass production can be achieved.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a preparation method of high-purity lithium sulfide. Comprising the following steps: putting lithium hydroxide and pure water into a reaction kettle, replacing air in the reaction kettle with nitrogen, starting the reaction kettle, and stirring and heating; introducing quantitative hydrogen sulfide gas from the bottom of the reaction kettle, and circulating the gas in the reaction kettle between liquid in the reaction kettle and a gas space through a gas circulating pump; and after the temperature of the reaction liquid in the kettle is reduced to 20-30 DEG C, filtering in a nitrogen atmosphere, washing the residual solid with quantitative ammonia water, transferring the filtered solid into a drying box, and purging and drying with nitrogen until no water exists, thereby obtaining the high-purity lithium sulfide. In the solvent method, water is used for replacing an organic solvent for reaction, the problems of organic solvent separation and recovery, hazardous waste treatment and the like are avoided, the cost is reduced, and the method is environment-friendly.

The invention relates to a high-permeability ultralow-coercive-force soft magnetic stainless steel heat treatment process which comprises the following steps: in a nitrogen atmosphere, firstly heating a hot-rolled wire rod to 900-950 DEG C at a heating rate of 30-50 DEG C / h, preserving heat for 4-6 hours to obtain a fine grain structure of equiaxial recrystallization ferrite, then cooling to room temperature at a cooling rate of less than or equal to 15 DEG C / h to homogenize the ferrite structure, and finally cooling to room temperature at a cooling rate of less than or equal to 15 DEG C / h to obtain the high-permeability ultralow-coercive-force soft magnetic stainless steel. The soft magnetic stainless steel is obtained. The method has the advantages that the maximum magnetic conductivity of the soft magnetic stainless steel is improved, the coercive force of the soft magnetic stainless steel is reduced, and the plasticity index of the soft magnetic stainless steel is improved.

The invention discloses room-temperature end-capped silicone rubber based on 107 glue and a preparation method of the room-temperature end-capped silicone rubber, and relates to the technical field of silicone rubber. The preparation method comprises the following steps: step 1, uniformly mixing 107 glue, isobornyl silane and a catalyst in a nitrogen atmosphere; stirring at room temperature for 1-1.5 hours to obtain room-temperature end-capping base glue; and 2, uniformly stirring and mixing the room-temperature end-capped base rubber, dimethyl silicone oil, the modified filler, methyltrimethoxysilane, gamma-aminopropyltriethoxysilane and an organic tin catalyst in a nitrogen atmosphere, and finally vacuumizing and stirring to obtain the room-temperature end-capped silicone rubber. According to the invention, the prepared room-temperature end-capped silicone rubber has excellent mechanical properties and stability.

The invention relates to a preparation method of a high-activity transition metal phosphide catalyst, which comprises the following steps: taking basic nickel cobalt carbonate (NiCo-OH / NF) grown on foamed nickel in situ as a precursor, placing the precursor at the downstream of a tubular furnace, placing NaH2PO2 at the upstream of the tubular furnace, annealing in a nitrogen atmosphere at 350 DEG C for 2 hours, and naturally cooling to obtain NiCoP / NF; the preparation method comprises the following steps: soaking NiCoP / NF in a potassium salt solution of a boride, washing, and carrying out vacuum drying to obtain a boron-potassium modified catalyst precursor NiCoP-BK / NF; in a three-electrode system, electrodeposition is carried out in an electrolyte containing a Ni source, a Fe source and deionized water, and the high-activity transition metal phosphide-nickel iron hydroxide NiCoP-BK-coated NiFe-LDH / NF heterojunction composite catalyst is obtained. The activity and stability of the transition metal phosphide catalyst can be remarkably improved, and the preparation method is simple and low in cost.

The invention belongs to the technical field of pollutant detection, and relates to an iron-based nano enzyme and application thereof in quinolone antibiotic detection. The preparation method comprises the following steps: adding ferric trichloride hexahydrate and cerium nitrate hexahydrate into water, uniformly mixing to obtain a mixed solution A, uniformly mixing the mixed solution A with an organic polyacid ligand solution, and then carrying out a reflux reaction to prepare a Ce / Fe-MOF precursor; and adding the Ce / Fe-MOF precursor and sodium hypophosphite into a tubular furnace, and calcining in a nitrogen atmosphere to prepare Ce / Fe-P. According to the present invention, the synthesized material has the nanometer prism mesoporous structure, the contact area with the substrate is effectively increased, the visual detection of the NOR can be achieved based on the principles of low-concentration NOR activity improving and high-concentration Ce / Fe-P activity inhibition, and the high sensitivity, the low detection limit, the wide linear response range and the good selectivity and the good stability are provided.

The invention provides a preparation method and system for improving the reliability of a gallium nitride transistor, and relates to the technical field of manufacturing, and the method comprises the steps: placing a pretreated sapphire substrate in metal organic chemical vapor deposition equipment, introducing trimethyl gallium and ammonia gas as precursors, and carrying out the epitaxial growth of gallium nitride; an alternating pulse supply technology is adopted, and trace iron doping is introduced in the epitaxial growth process so as to reduce the background carrier concentration in the gallium nitride layer; forming a source electrode structure, a drain electrode structure and a grid electrode structure on the gallium nitride epitaxial layer by adopting photoetching and plasma etching technologies; then, a layer of hafnium oxide with the thickness of 5-10 nanometers is deposited in the grid electrode area through the atomic layer deposition technology to serve as a grid dielectric layer; then a plasma enhanced chemical vapor deposition technology is adopted; and finally, the whole device is processed by using a laser annealing technology, and the annealing process is carried out in a nitrogen atmosphere so as to eliminate an interface state and reduce leakage current.

The invention provides a method for additive forming of a high-performance Ti2AlNb three-period minimal curved surface lattice structure in a nitrogen atmosphere, and belongs to the technical field of additive manufacturing. Comprising the following steps: step 1) modeling an implicit function of a TPMS configuration: designing a CAD model of the TPMS configuration and exporting the CAD model as an STL file; 2, pretreatment of the Ti2AlNb lattice structure formed through L-PBF, wherein an STL file is subjected to slicing treatment, and technological parameters are set; 3, L-PBF forming of the Ti2AlNb lattice structure is conducted, specifically, in the nitrogen-argon mixed atmosphere, the Ti2AlNb lattice structure is formed through the L-PBF technology; and (4) the TPMS configuration Ti2AlNb lattice structure is subjected to surface treatment. According to the method, the Ti2AlNb lattice structure with the TPMS configuration is designed through implicit function modeling, the Ti2AlNb lattice structure with the TPMS configuration is formed through L-PBF in the nitrogen-argon reaction atmosphere, the problems that in traditional particle strengthening, reinforcements are distributed unevenly, and the solid solution strengthening effect is limited are solved, and good matching of the strength, plasticity and toughness of the lattice structure is achieved.

The invention relates to the technical field of medicine analysis and detection, and particularly discloses a method for detecting the content of protein in a 3D-MLA adjuvant, which comprises the following steps: (1) preparing a test solution: firstly dissolving the 3D-MLA adjuvant by using a hydrochloric acid solution, performing 300-600W ultrasonic treatment for 2-5min, centrifuging 10000-13000g for 4-7min, and taking supernate; adding a compound enzyme into the supernate for enzymolysis; then adding concentrated hydrochloric acid, uniformly mixing, hydrolyzing for 20 + / -2 hours in a nitrogen atmosphere at 105-115 DEG C, blow-drying, and dissolving with a hydrochloric acid solution to obtain a test sample stock solution; adding a derivatization reagent into the test sample stock solution, and carrying out derivatization treatment, extraction and dilution to obtain a test sample solution; and (2) high performance liquid chromatography determination. According to the detection method provided by the invention, the residual quantity of the host cell protein in the 3D-MLA can be rapidly and accurately determined, and the quality control of the 3D-MLA is realized.

The invention discloses a self-template synthesized linear biochar-based bimetallic material as well as a preparation method and application thereof, and belongs to the technical field of carbon materials. The method comprises the following steps: pretreating ganoderma lucidum residues, and pyrolyzing in a nitrogen atmosphere to prepare charcoal; and mixing the prepared biochar with cobalt nitrate and sodium molybdate to prepare CoMoO4 nanoparticles with in-situ growth of the biochar, and then washing and drying to obtain the BC-coated CoMoO4 linear biochar-based bimetallic material. Heterojunctions formed by binding sites of cobalt-molybdenum bimetal and biochar in the material form more defect sites, the synergistic effect of the metal and the micro-nano fibrous biochar is exerted, the degradation rate in the application of catalytic degradation of bisphenol A can reach 98.18% or above, a multiple reaction mechanism with sulfate free radicals is jointly shown, and the photocatalytic degradation of bisphenol A is realized. And the method has higher adaptability and effectiveness for complex pollutants.

The invention relates to a pickling process of a cold-rolled strip, and belongs to the technical field of metal surface treatment. The acid pickling process comprises the steps of surface pretreatment, sand blasting treatment, acid pickling, water washing, passivation and the like. In the surface pretreatment, an oil removing agent and a rust removing agent are used for removing oil stains and rust stains on the surface of the cold-rolled strip, and then deionized water is used for cleaning. 200-mesh brown aluminum oxide and high-purity nitrogen are used for blowing and removing solid impurities in the sand blasting treatment. And pickling is carried out by using a 180-220g / L hydrochloric acid solution at 60-80 DEG C for 3-10 minutes. And after washing, drying at 110 DEG C in a nitrogen atmosphere. In the passivation step, a sodium nitrite passivation solution with the mass fraction of 30-50% is sprayed under the nitrogen atmosphere, and a laser drying method is used for drying. In addition, the invention further provides a preparation method of the oil removal agent and the rust removal agent and specific parameters of sand blasting treatment, nitrogen purging, acid pickling, spraying and laser drying.

The invention relates to the technical field of high polymer materials, and particularly discloses a nuclear-grade cable for spent fuel aftertreatment and a preparation method of the nuclear-grade cable. Comprising the following steps: S1, taking hydroxyl-containing cyclotriphosphazene, tetra (4-hydroxybenzene) ethylene, oleic acid acyl chloride, guar gum hydroxypropyl trimethyl ammonium chloride, triethylamine and a mixed solvent, cooling, dropwise adding triethylamine in a nitrogen atmosphere, dropwise adding a phenoxyphosphoryl dichloride solution, stirring for reaction, filtering, and performing rotary evaporation to obtain a composite flame retardant; s2, polyethylene, aluminum hydroxide, a composite flame retardant and an anti-radiation agent are added into an internal mixer for mixing, a cross-linking agent is added, uniform mixing, extrusion and granulation are performed, and a cable material is obtained; the cable material is used for preparing an outer sheath layer of a nuclear-grade cable. S3, twisting a plurality of copper metal monofilaments to form a conductor, wrapping the conductor with an insulating layer, and wrapping the conductor with a polyimide film to form a wire core; a plurality of wire cores are twisted to form a cable core; a non-woven fabric wrapping tape layer and an outer sheath layer are wrapped outside the cable core; and obtaining the nuclear-grade cable.

The invention relates to a method for optimizing the quality of a perovskite layer through atmosphere annealing, and belongs to the technical field of perovskite layer quality optimization, and the method comprises the steps: preparing precursor materials: taking methylamine hydrochloride, cesium iodide, formamidine iodide and lead iodide as perovskite precursor materials; the preparation method comprises the following steps: preparing a solvent: mixing N-methyl pyrrolidone with dimethylformamide; solution preparation: mixing the precursor material with a solvent to prepare a precursor solution; stirring and filtering the solution; preparing a substrate: sputtering NiO serving as a hole transport layer material on the glass substrate; blade coating of a perovskite precursor solution: uniformly blade coating the precursor solution on the glass substrate coated with the NiO film; preliminary drying; vacuum annealing preparation: placing the glass substrate coated with the perovskite precursor film in a vacuum cavity; nitrogen atmosphere filling: filling high-purity nitrogen; in the nitrogen atmosphere, the temperature in the cavity is increased to a certain temperature range, annealing is conducted at the temperature, and the optimized annealing temperature and time are selected; and cooling and packaging.

A perfluoroelastomer according to the present disclosure satisfies requirement 1 and has a crosslinkable group. Requirement 1: When the perfluoroelastomer is heated in a nitrogen atmosphere from a starting temperature of 40°C at a heating rate of 10°C / min from 40°C to 90°C, then held at 90°C for 120 minutes, then heated at a heating rate of 1°C / min from 90°C to 200°C, then held at 200°C for 240 minutes, then heated at a heating rate of 1°C / min from 200°C to 305°C, and held at 305°C for 720 minutes, the weight loss is 1.8 mass% or less.

The invention discloses a double transition metal / chitosan-based carbon aerogel composite material and a preparation method and application thereof.The method comprises the steps that a nitrogen source and transition metal salt are added into a hydrochloric acid solution of chitosan, stirred, dissolved and evenly dispersed to prepare a mixed solution, the mixed solution is subjected to freeze drying, and the double transition metal / chitosan-based carbon aerogel composite material is obtained. Chitosan aerogel containing transition metal and a nitrogen source is prepared; the transition metal salt is any two of ferric salt, cobalt salt and nickel salt; the chitosan aerogel containing the transition metal and the nitrogen source is placed in a methanol solution of 2-methylimidazole, after vibration treatment and drying, the chitosan aerogel is placed in a nitrogen atmosphere to be subjected to heat treatment, and the double-transition-metal / chitosan-based carbon aerogel composite material is prepared. The preparation method is simple and reasonable in design, the prepared material has good specific surface area and porosity, the formed metal-nitrogen double active center effectively improves the adsorption performance of the material, and the material has good catalytic performance.

The invention discloses a Ni3InC0.5 wave-absorbing material and a preparation method thereof, and the preparation method comprises the following steps: (1) dispersing Ni (CH3COO) 2.4 H2O and In (CH3COO) 2.6 H2O into N, N-dimethylformamide (DMF), and magnetically stirring to obtain a liquid A; (2) dispersing terephthalic acid (PTA) and triethylamine (TEA) into DMF, and magnetically stirring to obtain liquid B; (3) pouring the liquid B into the liquid A, and continuously stirring to obtain a Ni3InC0.5 precursor solution; (4) putting the solution obtained in the step (3) into a circulating water suction filter for suction filtration to obtain a gelatinous sample; and (5) taking a sample obtained in the step (4), calcining the sample in a nitrogen atmosphere, and naturally cooling the sample to room temperature to obtain Ni3InC0.5. The method has the characteristics of simple process and low cost, and the material is applied to the field of wave absorption for the first time.

The invention discloses a preparation method of a 6-alkyl aza-uracil compound, which comprises the following steps: in a nitrogen atmosphere solvent, irradiating a reaction mixture of an aza-uracil derivative and carboxylic acid active ester with visible light, adding a catalyst and stirring for reaction, and after the reaction is completed, performing column chromatography separation on the reaction mixed solution to obtain the 6-alkyl aza-uracil compound. The product 6-alkyl aza-uracil compound can be prepared. The synthesis method of the 6-alkyl aza-uracil compound provided by the invention does not need to use a photosensitizer and a metal catalyst, the reaction conditions are green and mild, and the operation is simple, convenient, rapid and efficient.

The invention relates to the field of inorganic powder preparation, and particularly discloses a preparation method and application of aluminum nitride powder. The preparation method of the aluminum nitride powder comprises the following steps: (1) by taking water as a dispersion medium, dispersing hydroxyl aluminum oxide and a carbohydrate into the dispersion medium, and then carrying out hydrothermal reaction to obtain a precursor; the precursor has a carbon-coated hydroxyl alumina core-shell structure; (2) calcining the precursor in a nitrogen-containing atmosphere to obtain aluminum nitride powder; wherein the volume equivalent diameter of the aluminum hydroxide is less than 0.82 mu m. By implementing the method, the aluminum nitride powder with high purity and excellent particle size distribution can be obtained.

The invention discloses a preparation method of a composite magnetic powder core of iron-nickel doped carbonyl iron powder, and belongs to the technical field of metal soft magnetic composite magnetic powder cores, the preparation method comprises the following steps: preparing spherical iron-nickel magnetic powder through a gas atomization method; processing the spherical iron-nickel magnetic powder by using a coupling agent to obtain modified spherical iron-nickel magnetic powder; and adding the modified spherical iron-nickel magnetic powder, carbonyl iron powder, kaolin, a binder and a release agent into a V-shaped stirrer, uniformly mixing to obtain mixed magnetic powder, pressing the mixed magnetic powder into a magnetic ring, performing annealing treatment in a nitrogen atmosphere, and performing furnace cooling to room temperature. According to the method, the high-sphericity-degree iron-nickel magnetic powder is firstly produced through a gas atomization method, then large pores among iron-nickel particles are filled with small carbonyl iron particles, and finally the magnetic core density is improved, so that the relative permeability and the direct-current bias performance of a composite magnetic powder core sample are improved; in addition, due to the fact that the nickel metal raw material is high in cost, the raw material cost for preparing the iron-nickel composite magnetic powder core is reduced through doping of the carbonyl iron powder.

The invention discloses a carbon-nitrogen packaged nickel-based binary metal hydrogen evolution catalyst, a preparation method and application, a nickel source, a molybdenum source and foamed nickel are subjected to a hydrothermal reaction, then landfill is carried out through CH4N2O, calcination is carried out at a high temperature in a nitrogen atmosphere, and the carbon-nitrogen packaged nickel-based binary metal hydrogen evolution catalyst is prepared. According to the method, 1 mol / L of KOH is used as an electrolyte, a graphite rod is used as a counter electrode, a reference electrode is Hg / HgO, the carbon-nitrogen packaged nickel-based binary metal hydrogen evolution catalyst is tested, the overpotential is only 44 mV under the current density of 10 mA / cm < 2 > through testing, the catalyst is still excellent in performance under the high current density, and data shows that the overpotential can still be kept within 125 mV under the current density of 100 mA / cm < 2 >.

The invention discloses an adsorbent for adsorbing V0Cs and a preparation method of the adsorbent. The adsorbent is prepared from the following raw materials in parts by weight: 50-80 parts of activated carbon, 20-40 parts of titanium dioxide, 10-30 parts of graphene, 10-20 parts of zeolite and 5-15 parts of a metal organic framework material. The preparation method comprises the following steps: S1, mixing the raw materials, adding deionized water, and stirring to form a uniform dispersion liquid; s2, performing ultrasonic treatment on the dispersion liquid, and drying to obtain a precursor; s3, calcining the precursor in a nitrogen atmosphere, and cooling to obtain the adsorbent. The preparation method has the beneficial effects that titanium dioxide realizes adsorption-degradation coupling through photocatalysis, so that the regeneration efficiency is improved; regular pore channels of zeolite realize molecular sieving, and selectivity is improved; the adsorption capacity is further optimized through the ultrahigh specific surface area and the adjustable aperture of the MOFs, dispersion of the nano-particles is promoted through ultrasonic treatment, and agglomeration is avoided; a stable composite interface is formed through high-temperature calcination, and the acting force between materials is enhanced; impurities are removed through acid activation, and the effective pore diameter is enlarged.

The invention discloses a visible-light-induced method for synthesizing DCPTA, which belongs to the technical field of organic synthesis, and comprises the following reaction steps: under a nitrogen atmosphere, sequentially adding o-dichlorobenzene, N, N-diethylaminoethanol, a novel metal iridium complex, a nickel catalyst and a solvent into a Schlenk tube, and reacting under the irradiation of a blue LED lamp at room temperature; determining whether the reaction system is terminated or not through a silica gel plate point plate; and after the reaction is ended, carrying out reduced pressure rotary evaporation, and carrying out silica gel column chromatography separation and purification to obtain the product DCPTA. The method for synthesizing the DCPTA through visible light induction has the advantages of cleanness, high efficiency, few side reactions and high reaction yield.

The present invention belongs to the technical field of phase change material microcapsules, and specifically discloses a multifunctional phase change microcapsule and its preparation method and application. First, an oil phase solution and a boron nitride lignin hybrid are prepared, and the prepared boron nitride lignin hybrid is dispersed in water and homogenized and emulsified with a water-soluble polyol and an oil phase solution to obtain a Pickering emulsion; in a nitrogen atmosphere, the mixture is heated to 50-80°C and stirred to react for a period of time, and after the reaction is completed, the multifunctional phase change microcapsule is obtained after suction filtration, washing, and drying. Compared with the prior art, the multifunctional phase change microcapsule prepared by the present invention has the characteristics of high thermal conductivity, high latent heat, compact shell structure, excellent ultraviolet shielding, etc., and can be used to prepare fabrics or coatings with ultraviolet shielding function.

The invention relates to application and a preparation method of a nano nitride dispersion strengthened nickel-based superalloy, and belongs to the technical field of superalloy materials. The alloy comprises the following components in percentage by mass: 50.0 to 55.0 percent of Ni, 21.0 to 35.0 percent of Cr, 3.5 to 5.5 percent of Nb, 3.0 to 5.0 percent of Mo, 1.0 to 3.0 percent of Co, 0.3 to 1.1 percent of Al, 0.6 to 2.2 percent of Ti, 0.1 to 0.3 percent of Si, 0.01 to 1.0 percent of rare earth element (RE), 0.01 to 0.05 percent of C, 0.01 to 0.15 percent of N, 0.002 to 0.020 percent of B and the balance of Fe and impurities. By regulating and controlling the RE / N atomic ratio (1: 1-2: 3) and the Ti / Al ratio (1.5-2: 1) and combining selective laser melting (SLM) 3D printing and a multi-stage heat treatment process in a nitrogen-containing atmosphere, nanoscale rare earth nitride particles with the average size of 1-10 nm and the number density of 1 * 10 < 22 >-3 * 10 < 24 > m <-3 > are generated in an alloy matrix, and gradient distribution is formed at a gamma phase interface and a grain boundary (the surface density is 20-50% higher than that of the interior). The yield strength of the alloy at 750 DEG C reaches 1150-1260 MPa, the creep life is prolonged by 2-10 times compared with that of a traditional alloy, the use temperature upper limit is improved by 50-100 DEG C, and the alloy is suitable for high-temperature parts such as aero-engine turbine discs and combustion chambers and has high strength, long service life and oxidation resistance.

The invention relates to the technical field of lithium ions, in particular to a preparation method of a nitrogen and boron-doped silicon-carbon negative electrode material, which comprises the following steps: in a nitrogen atmosphere, putting porous carbon into a first reaction container, heating to a first reaction temperature, introducing nitrogen source gas, preserving heat for a first time, cooling to room temperature, and discharging to obtain a nitrogen-doped porous carbon material; and placing the obtained nitrogen-doped porous carbon material in a second reaction container, heating to a second reaction temperature in a nitrogen atmosphere, introducing a boron source gas and a silicon source gas, carrying out second heat preservation for a second time, heating the second reaction container to a third reaction temperature, introducing a carbon source gas, carrying out third heat preservation for a third time, cooling to room temperature, and discharging to obtain the nitrogen-doped porous carbon material. At the moment, boron-doped nano amorphous silicon particles are deposited in pores in the nitrogen-doped porous carbon material. The problems of structure pulverization and short cycle life caused by volume expansion of the silicon-based negative electrode material in the cycle process are solved.

The invention provides a preparation method and application of a nitrogen-doped carbon coated non-noble bimetal honeycomb core-shell catalyst. The method comprises the following steps: stirring soluble metal salt and imidazole ligands in an aqueous solution to react to synthesize a double-center metal framework material, one is zinc, and the other is cobalt, iron or nickel; soaking the metal organic framework in a semi-polymerized glucose solution in a low-pressure environment to form a core-shell type compound; and calcining the compound in a nitrogen atmosphere to obtain the catalyst. Compared with a traditional supported metal catalyst, the catalyst provided by the invention has the advantages that the mesoporous rate is high, the size is wide, active sites are uniformly dispersed, the catalyst shows excellent performance in a reaction for preparing aniline through nitrobenzene hydrogenation, and complete conversion of nitrobenzene gt can be realized under mild conditions; the aniline yield is 99%. The preparation process of the catalyst is short in time consumption and high in yield, no by-product or waste is generated, the catalyst also has excellent selectivity on the aromatic nitro compound, and the selectivity of the corresponding amino product can reach 99%.

The present invention discloses a Ni3InC 0.5 absorbing material and a preparation method thereof. (1) Ni(CH3COO)2·4H2O and In(CH3COO)2·6H2O are dispersed in N,N-dimethylformamide (DMF), and after magnetic stirring, liquid A is obtained; (2) terephthalic acid (PTA) and triethylamine (TEA) are dispersed in DMF, and after magnetic stirring, liquid B is obtained; (3) liquid B is poured into liquid A, and stirring is continued to obtain a Ni3InC 0.5 precursor solution; (4) the solution obtained in step (3) is filtered by a circulating water suction filter to obtain a gel-like sample; (5) the sample obtained in step (4) is calcined under a nitrogen atmosphere, and after natural cooling to room temperature, Ni3InC 0.5 is obtained. The present invention has the characteristics of simple process and low cost, and for the first time, this material is applied to the field of wave absorption.

The invention discloses a method for synthesizing 3, 3 '-difluorobenzene. The invention discloses a method for preparing 3, 3 ', 5, 5'-tetramethyl-4, 4 '-dihydroxybiphenyl and derivatives thereof, which comprises the following steps of: adding 1.0 mmol of 4-halogenated aryl phenol compound, 0.05 mmol of photocatalyst and a solvent into a reaction container in a nitrogen atmosphere, stirring until the materials are dissolved, adding 0.05 mmol of metal catalyst and 0.06 mmol of ligand which are prepared in advance, turning on a light source, stirring for 24 hours at room temperature, performing thin layer chromatography detection reaction, filtering, washing and drying to obtain the 3, 3', 5, 5 '-tetramethyl-4, 4'-dihydroxybiphenyl and derivatives thereof. And after the reaction is finished, filtering the reaction liquid, removing the solvent through rotary evaporation, and carrying out recrystallization or column chromatography by using a mixed solvent to obtain the target product 3, 3 ', 5, 5'-tetramethyl-4, 4 '-dihydroxybiphenyl and the derivative thereof. According to the method, the 4-halogenated aryl phenol compound is used as a raw material, the required compound is obtained in one step through'nickel + light 'catalysis, and waste and related pollution caused by the use of high-explosive gas or a reducing agent are not needed; and a recyclable photocatalyst is used, so that the method is more environment-friendly and has a good industrial application prospect.

The invention relates to the field of electrode materials, in particular to a preparation method of a silicon-carbon composite electrode material. The method comprises the following steps: carrying out crushing pretreatment on the silicon-containing agricultural residues, and mixing the silicon-containing agricultural residues with tetraethyl orthosilicate according to a mass ratio of (3-5): 1; raising the temperature to 200-800 DEG C at the speed of 5 DEG C / min in a nitrogen atmosphere, and performing constant-temperature pyrolysis for 30-60 minutes; in the pyrolysis process, the TEOS is decomposed to generate a SiO2 nano-template to regulate and control a pore structure, part of the SiO2 nano-template is reduced into SiO nano-particles, and a SiO (at) C core-shell structure material with microporous and mesoporous graded pores is formed in situ; the product, conductive carbon and polyvinylidene fluoride are prepared into slurry according to the ratio of (6-7): (1.5-3): (1-1.5), the slurry is coated on activated carbon cloth, and the activated carbon cloth is freeze-dried to prepare the electrode. According to the preparation method, through design of the green activating agent, synchronous silicon-based compounding, pore regulation and control and pyrolysis process optimization, the defects of the traditional technology in the aspects of environmental protection, pore regulation and control accuracy and functional compounding are effectively overcome, and the electrochemical performance of the agricultural residue-based electrode material is remarkably improved.