1730 results about "Thermal reaction" patented technology

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using red mud and tungsten-molybdenum smelting slag, which comprises the following steps of: uniformly stirring and mixing the red mud and the tungsten-molybdenum smelting slag at a high speed, mixing with inorganic strong acid, and performing ultrasonic-assisted stirring to obtain acid leaching slag; the acid leaching residues are subjected to low-temperature plasma activating treatment and then microwave activating treatment, and microwave activated plasma residues are obtained; weighing tricalcium phosphate and microwave activated plasma slag, and uniformly stirring to obtain phosphorus-calcium doped activated slag; weighing an ammonium sulfide solution and the phosphorus-calcium doped activated slag, uniformly stirring, transferring the obtained sulfur-phosphorus-calcium doped activated slag into a hydrothermal reaction kettle, carrying out hydrothermal reaction, carrying out compression molding on the obtained hydrothermal composite material, and carrying out pyrolysis carbonization treatment in an inert gas atmosphere to obtain the phosphorus-calcium doped activated slag. The obtained pyrolysis composite material is soaked with a silane coupling agent solution and then roasted again, and the carbon monoxide oxidation catalyst is obtained. The catalyst prepared by the invention can realize efficient oxidation photocatalysis of carbon monoxide under the conditions of normal temperature and normal pressure.

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using titanium gypsum and a waste hydrogenation catalyst, which comprises the following steps: crushing and pickling the waste hydrogenation catalyst, washing with clear water until the waste hydrogenation catalyst is neutral, and drying to obtain pretreated waste catalytic powder; uniformly mixing and stirring titanium gypsum and the pretreated waste catalytic powder to obtain gypsum doped pretreated waste catalytic powder; mixing a plant extract, crop powder and gypsum, doping the pretreated waste catalytic powder, uniformly stirring, feeding into mixed bacteria consisting of bacillus and aspergillus, and fermenting under a stirring condition to obtain a biological activated mixture; adding water into the biological activation mixture for hydrothermal reaction, filtering, separating and washing the material after the hydrothermal reaction is finished, roasting the washed filter cake, naturally cooling the roasted material, and crushing to obtain the carbon monoxide oxidation catalyst. According to the invention, the titanium gypsum and the waste hydrogenation catalyst are combined, and the biomass material is used for activating treatment, so that the use of chemical precursors is reduced, and the oxidation catalyst with excellent catalytic performance is obtained.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The invention discloses a method for preparing a carbon monoxide normal-temperature oxidation catalyst based on electrolytic manganese residues and landfill leachate. The method comprises the following steps: soaking and purifying the electrolytic manganese residues with deionized water to obtain preliminarily purified electrolytic manganese residues; mixing aryl alcohol dehydrogenase, the preliminarily purified electrolytic manganese residues and the landfill leachate, and standing to obtain enzymolysis electrolytic manganese residue slurry; mixing fly ash, red mud and the enzymolysis electrolytic manganese slag slurry, uniformly stirring, drying and grinding to obtain a multi-component composite raw material; placing the multi-component composite raw material in low-temperature plasma equipment for irradiation to obtain a plasma activated composite material; and carrying out hydrothermal reaction on the plasma activated composite material to obtain a hydrothermal structure composite material, dipping the hydrothermal structure composite material in a solution containing cerium nitrate, drying, and roasting to obtain the carbon monoxide normal-temperature oxidation catalyst. The carbon monoxide normal-temperature oxidation catalyst with high activity and high moisture resistance is prepared by utilizing industrial wastes and landfill leachate enzymolysis derivative liquid.

The invention provides a preparation method for preparing porous carbon based on an aerogel method, the porous carbon and application of the porous carbon, and belongs to the technical field of porous carbon material preparation. The preparation method comprises the following steps: mixing polyhydroxy phenol, aromatic aldehyde, acrylamide, graphene oxide and lithium salt according to a mass ratio of 100: (50-200): (5-30): (1-5): (1-5), carrying out hydrothermal reaction at 100-200 DEG C for 1-6 hours, and freeze-drying at-40 DEG C to obtain a hydrogel precursor; and carbonizing the precursor in organic heteroatom gas at 500-800 DEG C, mixing the intermediate with alkali according to the ratio of 100: (100-500), activating at 900-1100 DEG C, pickling and drying to obtain the porous carbon. The conductivity of the product is improved by means of graphene, lithium salt and heteroatoms, and the aerogel method obtains large aperture, has the characteristics of low impedance, high first efficiency and small charge-discharge expansion, and can be efficiently applied to silicon-carbon materials.

The application provides a preparation method of a self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon composite material, a product and application, high-content nitrogen-doped porous carbon material is synthesized by inducing dicyandiamide molecules to undergo a supramolecular self-assembly process, and on this basis, a hydrothermal reaction is carried out to coat molybdenum sulfide sheet layer material on the surface, and finally, a self-heating coiling treatment is carried out to form a carbon-based electrocatalyst of the self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon. Compared with a high specific surface area carbon-based catalyst, high doping concentration of nitrogen atoms can provide more electron-rich properties to facilitate the adsorption of substances, and the self-coiled carbon-based material can exhibit very excellent electrochemical performance, especially in the aspect of electrochemical hydrogen production. The preparation method is simple in operation, low in preparation cost and suitable for large-scale production.

The invention discloses a preparation method and application of a bimetallic sulfide / three-dimensional porous carbon catalyst, and relates to the technical field of electrolyzed water catalysts.The preparation method comprises the following steps that melamine sponge is cleaned, and the clean melamine sponge is obtained; the preparation method comprises the following steps: dissolving metal salt 1 and metal salt 2 in an ethanol aqueous solution, and adding alkali and an aniline monomer to obtain a precursor solution; completely soaking the clean melamine sponge in a precursor solution, carrying out constant-temperature hydrothermal reaction, and sequentially washing and drying to obtain the melamine sponge anchored with bimetal ions; introducing inert gas for protection, and performing high-temperature vulcanization treatment to obtain the three-dimensional porous carbon catalyst embedded with the bimetallic sulfide heterostructure. The catalyst comprises uniformly dispersed bimetallic sulfide nanoparticles and a spongy three-dimensional porous carbon carrier, shows excellent bifunctional catalytic activity and stability when being applied to an electro-catalytic water decomposition reaction, and has a wide application prospect.

The invention belongs to the technical field of nano fluorescent powder, and particularly relates to Ca10 (PO4) 6 (OH) 2: RE < 3 + > nano fluorescent powder as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing Ca (NO3) 2 and RE (NO3) 3 solutions in proportion to prepare a cation solution, dropwise adding a certain amount of H3PO4 to prepare a mixed solution, adjusting the pH value by using a charge compensation agent, uniformly stirring, performing ultrasonic dispersion, performing hydrothermal reaction on the obtained solution, and purifying to obtain the final product Ca10 (PO4) 6 (OH) 2: RE < 3 + > nano fluorescent powder. The charge compensation agent is at least one of KOH and LiOH. By utilizing the methods, the invention provides the Ca10 (PO4) 6 (OH) 2: RE3 + nano fluorescent powder taking K < + > / Li < + > as the charge compensation agent, and the Ca10 (PO4) 6 (OH) 2: RE3 + nano fluorescent powder has the advantages of thermal stability, color stability and high luminescence, and is suitable for temperature sensing, cheilogramma and anti-counterfeiting detection.

The invention discloses a low-cost high-first-effect micron silicon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: treating the surface of micron silicon by adopting an oxidant solution to form a silicon dioxide passivation layer, and then carrying out surface modification by using a silane coupling agent; the method comprises the following steps: performing acid-base alternate soaking treatment on a biomass carbon source to reduce the content of metal impurities; mixing the delimed biomass carbon source, the composite carbon source and the pretreated micron silicon, firstly adding a weak acid catalyst for hydrothermal reaction to form a hard carbon inner layer, then adding a weak base catalyst for regulating the pH value of the system to alkalescence in batches, and continuing hydrothermal reaction to form a soft carbon outer layer; and washing and drying the product, and carrying out carbonization treatment in an inert atmosphere to obtain the composite coated micron silicon material. The first efficiency of the material is greater than or equal to 92%, the 1C 1000-time circulation capacity retention ratio is greater than or equal to 82%, the raw material cost is low, the process is simple, and the material is suitable for lithium ion batteries in the fields of power, energy storage and consumer electronics.

The invention discloses a nickel-cobalt-selenium (Co1-xNixSe2) nano material for electrocatalytic oxidation of ethylene glycol as well as a preparation method and application of the nickel-cobalt-selenium (Co1-xNixSe2) nano material. The material is prepared by a hydrothermal method which comprises the following steps: (1) pouring 20mL of deionized water containing 475.9 mg of CoCl2. 6H2O into a 1mol / L NaOH solution containing 0.32 g of selenium powder to prepare a precursor solution; (2) placing in a stainless steel autoclave with a polytetrafluoroethylene lining, carrying out hydrothermal reaction at 180 DEG C for 18 hours, washing with absolute ethyl alcohol and deionized water, and carrying out vacuum drying at 60 DEG C to obtain a CoSe2 material; and (3) the molar feeding ratio of CoCl2. 6H2O to NiCl2. 6H2O is adjusted, so that the nickel / cobalt ratio x is 0.25, 0.50 or 0.75, and materials with different components, namely Co < 0.75 > Ni < 0.25 > Se < 2 >, Co < 0.50 > Ni < 0.50 > Se < 2 > and Co < 0.25 > Ni < 0.75 > Se < 2 >, are prepared. The series of materials are applied to ethylene glycol oxidation under the alkaline condition, the catalytic performance of Co < 0.50 > Ni < 0.50 > Se < 2 > is optimal, the current density reaches 111 mA cm <-2 > under the electric potential of 1.6 V vs.RHE, the total Faraday efficiency reaches up to 91.4%, and the application prospect in the field of PET plastic recovery is wide.

The invention discloses magnesium modified fecal sludge hydrothermal carbon as well as a preparation method and application thereof, and belongs to the technical field of solid waste treatment in the environmental protection industry. The invention relates to a preparation method of magnesium modified fecal sludge hydrothermal carbon. The preparation method comprises the following steps: uniformly mixing fecal sludge powder and a magnesium additive to obtain a mixture; taking water as a solvent, and adding the mixture for hydrothermal reaction to obtain the magnesium modified fecal sludge hydrothermal carbon. According to the invention, waste utilization is carried out on the excrement sludge, modification is carried out through the magnesium additive, and loss of nutrient substances such as nitrogen, phosphorus and the like is effectively reduced. The magnesium modified fecal sludge hydrothermal carbon is applied to soil, can effectively promote the growth of pakchoi, and has certain agricultural value.

The invention relates to a 1D / 2D dual-heterojunction catalyst, a preparation method thereof and application of the 1D / 2D dual-heterojunction catalyst in photo-assisted periodate activated degradation of bisphenol A. The preparation method comprises the following steps: mixing a concentrated hydrochloric acid solution with LiF, adding Ti3AlC2, carrying out a heating reaction, carrying out solid-liquid separation to obtain a solid phase, washing the solid phase to be neutral, and dispersing the solid phase in ethanol to obtain an MXene ethanol solution; adding a cerium source aqueous solution into an MXene ethanol solution, mixing, and placing in liquid nitrogen to obtain a mixed solution; mixing an organic ligand, ethanol and pure water to obtain a mixed solution, carrying out a mixed heating reaction on the mixed solution and the mixed solution, carrying out solid-liquid separation to obtain a precipitate, and freeze-drying to obtain powder; and heating and calcining the obtained powder in an inert atmosphere to obtain the 1D / 2D dual-heterojunction catalyst. According to the invention, photogenerated electron-hole recombination is effectively inhibited by constructing double heterojunctions, and ultrafast electron transfer is realized at the same time, so that the oxidation effect is enhanced, and the efficient photocatalytic activity of '1 + 1gt, 2' is realized.

The invention discloses a sulfur-resistant non-noble metal catalyst for removing carbon monoxide and a preparation method thereof. The preparation method comprises the following steps: step 1, dissolving aluminum oxide, cerium-containing metal salt and a precipitator in a solvent, fully mixing, and dispersing to obtain a colloidal dispersion system; a hydrothermal product is obtained after the hydrothermal reaction, and solid powder A is obtained after the hydrothermal product is roasted; step 2, dropwise adding a copper-containing metal salt solution into the solid powder A under a ball-milling condition to obtain a turbid liquid; carrying out heat preservation roasting to obtain solid powder B; 3, roasting the molybdenum-containing metal salt, and performing thermal decomposition to obtain solid powder C; and 4, adding the solid powder C obtained in the step 3 into the turbid liquid of the solid powder B, dispersing, and roasting to obtain the required catalyst. The obtained catalyst is stable in overall structure and can still keep good catalytic performance in a sulfur-containing environment.

The invention discloses a preparation method of a lanthanum ferrite / zinc oxide composite material, which comprises the following steps: preparing lanthanum ferrite LFO, ultrasonically stirring ferric nitrate nonahydrate, lanthanum nitrate hexahydrate and a dispersing agent in a hydrothermal solvent to obtain a mixed solution, preparing an LFO / ZnO composite material, dispersing the LFO prepared in the step S1 and zinc acetate in ethanol, performing ultrasonic treatment, heating and stirring, and condensing and refluxing to obtain the LFO / ZnO composite material. Cooling, and continuously stirring in an ice-water bath; dropwise adding a NaOH ethanol solution at the temperature of 0 DEG C, and stirring for 2 hours; adding deionized water, stirring, centrifuging to remove the supernatant, dispersing the precipitate powder in ethanol, and carrying out hydrothermal reaction; after the hydrothermal reaction is finished, centrifuging the solution, and after centrifugation is finished, pouring out the solution to obtain a precipitate; washing with deionized water and an ethanol solution, drying the precipitate, and calcining the dried powder in a muffle furnace to obtain a p-n type LFO / ZnO composite material; according to the method, the size of lanthanum ferrite can be accurately regulated and controlled through a cooperative regulation strategy of the solvent proportion and the ligand size, and different types of gases can be accurately distinguished.

The invention discloses a tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst, a preparation method thereof and an application of the tetrathiomolybdate intercalated ternary iron-magnesium-zinc layered double hydroxide catalyst in degrading azo dyes by activating peroxymonosulfate. According to the method, a carbonate intercalated ternary LDH precursor is synthesized through a hydrothermal reaction, interlayer anions are replaced with nitrate and tetrathiomolybdate through ion exchange, and the target catalyst is obtained. In the catalyst, a unique Fe-Mg-Zn ternary metal laminate and a MoS < 2-> intercalation structure cooperatively construct a multi-active center, and MoS < 2-> is used as an electron donor to promote cyclic regeneration of Fe < 3 + > / Fe < 2 + >. The catalyst keeps ultrahigh activity in a wide range of pH (potential of hydrogen) of 3-9, can completely degrade 10 mg / L of acid orange 7 within 5 minutes, and is stable in structure and low in metal dissolution risk. The problems of low activity, slow Fe < 3 + > reduction, metal ion dissolution and the like under neutral and alkaline conditions in an advanced oxidation technology based on peroxymonosulfate are solved, and the method has important application value in the field of printing and dyeing wastewater treatment.

The invention discloses a preparation method of high-dispersion superfine spherical nickel powder, which comprises the following steps: preparing nickel salt, a complexing agent and a dispersing agent into a nickel salt aqueous solution, converting a precipitant aqueous solution into precipitant micro-nano aerosol, adding the precipitant micro-nano aerosol into the nickel salt aqueous solution, and carrying out gas-liquid phase confinement micro-zone pre-reaction to obtain the high-dispersion superfine spherical nickel powder. And carrying out homogeneous hydrothermal reaction and vacuum roasting to obtain the high-dispersion superfine spherical nickel powder. According to the method, low-cost and low-pollution soluble nickel salt is used as a nickel source, aerosol confinement microcell reaction is established, controllable preparation of spherical nickel particles with high purity, high sphericity degree, high dispersity and uniform morphology is achieved, the high-dispersion superfine spherical nickel powder is effectively obtained under the conditions of low cost and low energy consumption, and the method is suitable for industrial production. The high-dispersion superfine spherical nickel powder meets the requirements of high-dispersion superfine spherical nickel powder required by inner electrode slurry of various sizes for the MLCC, meanwhile, the high-dispersion superfine spherical nickel powder has good fluidity, and preparation of high-performance inner electrode slurry of the MLCC is facilitated.

The invention belongs to the technical field of electro-catalysis water decomposition, and relates to a self-supporting W-NiCoP / NF composite material and a preparation method and application thereof. Cobalt salt, terephthalic acid, acetic acid and foamed nickel are subjected to a first solvothermal reaction, and defect type Co-MOF / NF is obtained; immersing the defect type Co-MOF / NF into a tungstate solution, and then carrying out a second solvothermal reaction to obtain a defect type W-Co-MOF / NF precursor; and carrying out phosphating heat treatment on the defect type W-Co-MOF / NF precursor and a phosphorus source in an inert atmosphere to obtain the W-Co-MOF / NF composite material. According to the preparation method disclosed by the invention, the tungsten-doped nickel-cobalt bimetallic phosphide with rich defect structures is successfully constructed on the foamed nickel substrate through a step-by-step solvothermal and gas-phase phosphating strategy, so that organic combination of a bimetallic synergistic effect and defect engineering is realized; the prepared self-supporting composite material has more active sites, a better electronic structure regulation effect and better stability.

The invention provides a chlorine corrosion resistant cathode for electrolyzing seawater as well as a preparation method and application of the chlorine corrosion resistant cathode. The preparation method comprises the following steps: S1, dissolving a cobalt salt, a nickel salt, a morphology regulating agent and a structure-directing agent in a solvent according to a molar ratio of (1-2.5): (1-2.5): (8-12): (6-10), and stirring to form a first solution; s2, a titanium mesh and the first solution are subjected to a hydrothermal reaction at the temperature of 100-150 DEG C, and CoNi layered double hydroxide with the shape of a nanoneedle array grows on the titanium mesh in situ; s3, selenium powder and a reducing agent are dissolved in a solvent according to the molar ratio of 1: (0.8-1.5) and stirred to form a second solution; and S4, carrying out hydrothermal reaction on the titanium mesh on which the CoNi layered double hydroxides grow in situ and a second solution at 150-190 DEG C so as to grow cobalt-nickel bimetallic selenide of which the morphology is a nanoneedle array in situ on the titanium mesh, thereby obtaining the chlorine corrosion resistant cathode.

The utility model discloses a reaction furnace and a recovery system, and relates to the technical field of chemical equipment. The reaction furnace comprises a furnace body, a crucible and an isolation protection layer, the crucible and the isolation protection layer are both arranged in the furnace body, the isolation protection layer is arranged in the crucible, a reaction chamber is formed in the isolation protection layer, and the reaction chamber is used for containing reactants; the reaction furnace heats reactants in the reaction chamber through the crucible, and the isolation protection layer is used for separating the reactants in the reaction chamber from the crucible. The scheme at least can be used for improving the process quality of the reaction furnace.

The application discloses a kind of microspheroidal high-entropy spinel type ferrite wave-absorbing materials and preparation method thereof, belong to electromagnetic wave absorbing material technical field, the preparation method includes with the designed molar ratio six metal nitrate is weighed and dissolved in deionized water, then add ammonium fluoride, urea, after stirring, the obtained solution is hydrothermal reaction at a certain temperature for a certain time to obtain precursor, the precursor is calcined to obtain microspheroidal high-entropy spinel type ferrite.The obtained wave-absorbing material is single-phase spinel structure, micron-sized spherical morphology, its chemical formula is MFe2O4;Wherein M=Co, Ni, Cu, Zn, Cr.The microspheroidal high-entropy spinel type ferrite wave-absorbing material and preparation method thereof are used, and the performance of pure ferrite wave-absorbing material can be effectively improved, with the characteristics of simple preparation, strong absorption performance, absorption frequency bandwidth.

According to the preparation method of the metal atom supported layered manganese oxide electrocatalyst, a precursor solution and foamed nickel are subjected to a hydrothermal reaction, cooling is performed to reach the room temperature after the reaction is finished, the foamed nickel after the reaction is dried, and the layered manganese oxide electrocatalyst is obtained. The layered manganese oxide electrocatalyst is placed in a metal salt electrolyte for electrochemical deposition so as to obtain the metal atom loaded layered manganese oxide electrocatalyst. According to the invention, heterogeneous atoms form metal load on the surface of manganese oxide so as to improve the electrocatalytic activity, selectivity and stability of the catalyst, which is an effective way. The metal load can further regulate and control the interlayer spacing and the electronic structure, more active sites are exposed, and the reaction kinetics can be optimized through bimetal coordination and electronic structure regulation and control; the metal atom doped needle-shaped manganese oxide electrocatalyst is prepared by combining a hydrothermal method with an electrodeposition method, and the preparation method is relatively simpler. In addition, the invention further provides the metal atom supported layered manganese oxide electrocatalyst and application.

The invention discloses an AgBr-loaded ZnO material, a preparation method of the AgBr-loaded ZnO material and an isopropanol sensor. The method comprises the following steps: firstly, dissolving glucose and urea in deionized water, uniformly stirring, and then adding a zinc source; carrying out hydrothermal reaction on the obtained solution, and firing a product to obtain a ZnO material; and dispersing a proper amount of ZnO powder into deionized water, sequentially adding a bromine source solution and a silver source solution, stirring, collecting a product, washing, and drying to obtain the AgBr-loaded ZnO material. According to the method, the concentration of oxygen adsorbed on the surface of ZnO is remarkably improved by utilizing the overflow effect of noble metal Ag and photoelectron transfer between AgBr and ZnO, so that the chemical reaction between the oxygen and isopropanol is promoted. The prepared AgBr-loaded ZnO material has the characteristics of high sensitivity, rapid response, low detection lower limit, good selectivity and the like for isopropanol gas at a relatively low working temperature.

The invention belongs to the technical field of catalysts, and particularly relates to a formaldehyde removal catalyst and a preparation method and application thereof. The formaldehyde removal catalyst is prepared by carrying out hydrothermal reaction and roasting treatment on a mixture of the following raw materials: metal salts including Mn salt, Co salt and Fe salt; an organic precursor, wherein the organic precursor comprises 2-nitroaniline and carboxymethyl cellulose; wherein the molar ratio of the Mn element to the Co element to the Fe element in the metal salt is (4.5 to 5.0): (2.0 to 2.5): (1.5 to 1.8); the ratio of the total mass of the Mn element, the Co element and the Fe element in the metal salt to the mass of the organic precursor is (80-85): (15-20). According to the formaldehyde removal catalyst, the metal elements are loaded on the hydrophobic carbon layer of the nitrogen-containing structure, so that the problem that the toluene adsorption capacity is weak due to the fact that a traditional catalyst does not have specific sites is solved, and the problem that the catalyst is inactivated due to the fact that multiple pollutants compete for active sites and a product overflows slowly can also be solved.

The invention discloses tetragonal system germanium dioxide and a hydrothermal synthesis method thereof. According to the method, hexagonal crystal system germanium dioxide is taken as a raw material, a hydrothermal reaction is carried out in an acidic aqueous solution, and efficient conversion from a hexagonal crystal system to a tetragonal crystal system is realized by controlling the reaction temperature to be 120-240 DEG C, the reaction time to be 24-48 hours and the pH value to be 1-3. According to the preferable scheme, the raw materials are subjected to calcination pretreatment at the temperature of 500-600 DEG C, the yield of the tetragonal crystal phase can be remarkably increased, and the synthesis temperature can be reduced to 120 DEG C. According to the invention, stable synthesis of tetragonal system germanium dioxide is realized for the first time under the mild condition of 240 DEG C and below, and the technical problem that high-temperature transformation at 1000 DEG C or above is needed in the traditional method is solved. The tetragonal crystal system germanium dioxide prepared by the method is of a regular polyhedral structure, has the particle size of 400-500nm, and can be used as a high-efficiency catalyst for polyester synthesis. The process is energy-saving and environment-friendly, the total utilization rate of the raw materials is increased by recycling the waste liquid, and the process has remarkable industrial application value.

A method for forming a film, including: atomizing a raw material solution into a mist to form raw material mist; mixing raw material mist and a carrier gas to form gas mixture; placing a substrate on a placement section of susceptor; supplying gas mixture from an atomizer to the substrate to perform film formation by thermal reaction on substrate; and discharging gas mixture after the film formation through an exhaust unit, wherein in the step of supplying the gas mixture from atomizer to substrate to perform film formation by thermal reaction on the substrate, at least a part of gas mixture is supplied from a smooth section adjacent to placement section to a surface of substrate, the smooth section having a surface roughness of 200 μm or less. A method for forming a film capable of uniformly and stably producing a high-quality film on a surface of a large-diameter substrate.

The invention discloses a preparation method of a carbon composite material doped with multiple metal elements. The preparation process comprises the following steps: S1, dispersing a porous carbon precursor, organic lithium fluoride, an organic rare earth compound and an organic catalyst in a solvent, performing hydrothermal reaction, and drying to obtain a porous carbon precursor loaded with lithium / rare earth element / catalyst; s2, uniformly mixing the obtained material with an activating agent and a doping agent, and activating at the temperature of 900-1100 DEG C to obtain multi-metal element doped porous carbon; and S3, carrying out reduction treatment and surface passivation treatment on the multi-metal element doped porous carbon to obtain the multi-metal element porous carbon composite material. According to the obtained material, lithium-doped and rare earth-doped porous carbon is utilized to improve the electronic conductivity of the material and increase the interlayer spacing of the carbon material, a carbon nanotube is grown by utilizing a catalyst to improve the conductivity of the material and reduce expansion, and through reduction and passivation treatment, the surface activity of the material is reduced, and the first efficiency is improved.

The application discloses a preparation method of a molybdenum-nickel hydroxyl oxide catalyst and application thereof, and the preparation method comprises the following steps: firstly, a precursor MoNi LDH material is obtained through a hydrothermal reaction; and then, the MoNi LDH material is electrochemically oxidized to obtain the molybdenum-nickel hydroxyl oxide material; and the electrochemical oxidation time is 10-60 minutes. The molybdenum-nickel hydroxyl oxide material has excellent urea catalytic activity and stability. When the molybdenum-nickel hydroxyl oxide material is applied as an anode catalyst, urea removal and hydrogen peroxide preparation can be realized, the problem of activity reduction caused by the lack of OH- in a traditional electrocatalytic process is solved, the urea removal rate in water can reach 100%, 28 g / L of hydrogen peroxide is obtained at the same time, the Faraday efficiency of H2O2 generation is maintained at 80%-90%, the device can maintain stable urea removal and H2O2 generation performance in a long running time, the activity of the generated H2O2 is high, and the H2O2 can be used for Fenton treatment of sulfamethoxazole pollutants in water, and the removal rate of sulfamethoxazole is more than 90%.

The invention relates to a RuSe2-MoSe2 / NF heterojunction bifunctional catalyst for fully hydrolyzed seawater as well as a preparation method and application of the RuSe2-MoSe2 / NF heterojunction bifunctional catalyst, and belongs to the technical field of seawater electrolysis electrocatalysis. The preparation method of the bifunctional catalyst comprises the following steps: (1) mixing deionized water and absolute ethyl alcohol, and magnetically stirring to obtain a mixed solvent; then adding sodium borohydride and selenium powder into the mixed solvent, and stirring until the mixture is completely dispersed to obtain a mixed solution; adding sodium molybdate dehydrate and ruthenium trichloride into the mixed solution, introducing high-purity nitrogen, replacing air, and continuing magnetic stirring to obtain a dark brown precursor mixed solution; and (2) completely immersing the pretreated nickel foam NF in the precursor mixed solution, carrying out hydrothermal reaction, cooling to room temperature after the reaction, taking out the nickel foam NF, washing with deionized water for 3-5 times, then washing with absolute ethyl alcohol for 3-5 times, and drying to obtain the nickel foam NF. The bifunctional catalyst provided by the invention can efficiently catalyze a hydrogen evolution reaction and an oxygen evolution reaction in seawater at the same time.

The invention discloses a method for preparing a carbon-coated cobalt-cerium composite material by using rapid Joule heat, and belongs to the technical field of catalytic materials and hydrogen production by electrolyzing water. The method comprises the following steps: dissolving a cobalt source and a cerium source in a solvent to obtain a mixed metal salt precursor solution, and then uniformly dipping or dropwise adding the mixed metal salt precursor solution onto a cellulose-based porous carbon source precursor to obtain a supported precursor; and finally, placing the load type precursor at two ends of an electrode of a Joule thermal reaction device, and under a vacuum condition, applying instantaneous current to carry out Joule thermal shock treatment so as to prepare the CoCe-C composite material. The preparation process is extremely simple, the energy consumption is extremely low, expensive precious metal and complex equipment are not needed, the obtained CoCe-C material serves as an anode catalyst to be applied to a hydrazine oxidation auxiliary water electrolysis system, the excellent catalytic activity and stability are shown, the voltage of an electrolytic bath can be remarkably reduced, low-energy-consumption, efficient and safe hydrogen production is achieved, and the method is suitable for industrial production. Wide industrial application prospects are realized.

The invention discloses a modified cobaltosic oxide catalyst and a preparation method and application thereof.The catalyst comprises a carrier foamed nickel, tungsten and chlorine co-doped cobaltosic oxide nanosheets W and Cl-Co3O4, the tungsten and chlorine co-doped cobaltosic oxide nanosheets W and the Cl-Co3O4 are loaded on the carrier, cobalt chloride and tungsten salt serve as precursors of the catalyst, and the tungsten and chlorine co-doped cobaltosic oxide nanosheets W and the Cl-Co3O4 are loaded on the carrier. The preparation method comprises the following steps: firstly, carrying out a hydrothermal reaction to obtain a nickel foam loaded tungsten-doped basic cobalt chloride nanosheet W-Co2 (OH) 3Cl2, and then carrying out in-situ conversion on the Co2 (OH) 3Cl2 into a nickel foam loaded tungsten and chlorine co-doped cobaltosic oxide nanosheet W, Cl-Co3O4 through calcination. According to the invention, chlorine and tungsten are introduced into cobaltosic oxide, so that the activity and stability of electrocatalytic oxygen evolution are improved, and the cobaltosic oxide is used as an anode catalyst for electrocatalytic seawater decomposition and has excellent activity and stability of electrocatalytic oxygen evolution.