238 results about "Metal nitrate" patented technology

The invention belongs to the technical field of rare earth functional materials, and particularly relates to a rare earth aluminate low-temperature magnetic refrigeration material and a preparation method and application thereof.The preparation method comprises the following steps that 1, rare earth metal nitrate and aluminum nitrate are added into water to be mixed, and a mixed solution is prepared; adding ammonia water into the mixed solution to prepare a precipitate; (2) carrying out annealing treatment on the precipitate to prepare a metal oxide; and (3) calcining the metal oxide to obtain the rare earth aluminate low-temperature magnetic refrigeration material. The rare earth aluminate which has the characteristics of stable structure, low preparation cost, strong mechanical property, high magnetic density and the like and is prepared by adopting a coprecipitation method and combining a high-temperature sintering technology has more excellent magnetocaloric properties in a low-temperature region.

The invention discloses an A-site high-entropy solid oxide fuel cell cathode material as well as a preparation method and application thereof, and provides an A-site high-entropy solid oxide fuel cell cathode material Pr < 0.2 > M < 0.2 > La < 0.2 > Ba < 0.2 > Sr < 0.2 > Co < 0.8 > Fe < 0.2 > O < 3-delta > with a perovskite phase. The preparation method comprises the following steps: S1, weighing multi-element metal nitrates, and mixing to obtain a first mixed solution; s2, dissolving ethylenediamine tetraacetic acid in ammonia water to obtain a second mixed solution; mixing the first mixed solution, the second mixed solution and citric acid to form a mixed precursor solution; s3, carrying out second heating treatment on the mixed precursor solution, and adjusting the pH value to form a gel precursor; and S4, carrying out pre-sintering treatment, third heat treatment and calcination treatment on the gel precursor to obtain a high-grade powder precursor, and carrying out ball milling and sieving treatment to obtain the A-site high-entropy solid oxide fuel cell cathode material. The cathode material is high in stability and good in chemical compatibility with a barrier layer GDC, provides high-quality mass transfer channels and active sites for O2 / O- / O2-, and has good electrochemical performance at medium and low temperatures.

The invention discloses a preparation method and application of a mesoporous confinement nickel-based methane dry reforming catalyst, and belongs to the field of nano-catalyst preparation.According to the method, on the basis of a traditional impregnation method, a small amount of ethylene glycol is added to serve as a surface active agent, high-temperature-resistant SBA-15 with ordered mesoporous channels serves as a carrier, metal nitrate serves as a precursor, and the mesoporous confinement nickel-based methane dry reforming catalyst is prepared through a hydrothermal method; in the high-speed stirring evaporation process, along with evaporation of water, the surface tension of the mixed liquid is gradually reduced, and meanwhile, the viscosity of the solution is increased, so that the metal nitrate precursor can be conveyed into an SBA-15 pore channel and is anchored in the pore channel under the action of high viscosity. And the methane dry reforming catalyst with high activity and high stability is obtained through drying, calcining and hydrogen reduction. The catalyst has the advantages of simple preparation process, low cost, high catalytic efficiency, high stability and the like.

The invention discloses a two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst, which is prepared by the following steps: uniformly grinding glucose, ammonium nitrate and transition metal nitrate, calcining at high temperature to generate a two-dimensional metal oxide nanosheet, mixing the two-dimensional metal oxide nanosheet with surfactant modified reduced graphene oxide powder, and sintering at high temperature to obtain the two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst. And transferring into a high-pressure hydrothermal kettle for solvothermal reaction, so that the reduced graphene oxide and the two-dimensional metal oxide nanosheet are compounded to form the composite burning rate catalyst with a 2D-2D structure. Two two-dimensional materials are compounded through a solvothermal method, the defects of accumulation of reduced graphene oxide and aggregation of the two-dimensional metal oxide due to high surface energy are effectively avoided, meanwhile, the high conductivity of the reduced graphene oxide is utilized, the synergistic catalysis effect of the metal oxide and the carbon material is enhanced, and the performance of the composite material is improved. The composite material has a good catalytic effect on the thermal decomposition process of ammonium perchlorate.

The invention discloses a preparation method of a metal-doped cobalt-based oxide material, which comprises the following steps: metal nitrate is dissolved in glycerol and isopropanol, a solvothermal method is adopted for reaction to obtain a reaction product, the metal in the metal nitrate comprises cobalt and at least one of nickel, copper, iron or molybdenum, the concentration of cobalt nitrate in the dissolved solution is 0.001-0.05 mM, and the concentration of cobalt nitrate in the solution is 0.01-0.05 mM; the concentration of metal nitrate except cobalt is 0.1-1 mu M; the reaction product is subjected to high-temperature calcination, the metal-doped cobalt-based oxide material with the microstructure being nanospheres with rough surfaces is obtained, the reaction temperature of the solvothermal method is 120-180 DEG C, and the reaction time is 3-6 h. The invention also discloses the metal element doped cobalt-based oxide material obtained by the preparation method and application of the metal element doped cobalt-based oxide material in electrocatalytic nitrate reduction synthesis of ammonia. The preparation method provided by the invention is simple, and the prepared metal-doped cobalt-based oxide material shows excellent electrochemical performance when applied to electrocatalytic nitrate reduction synthesis of ammonia.

The invention relates to the field of porous carbon materials, and provides a preparation method of a three-dimensional porous carbon block electrode based on a polymer material, and the preparation method comprises the following steps: mixing a carbon source with a pyrolysis auxiliary agent to prepare a block precursor with a user-defined target shape; heating the blocky precursor to 1000 DEG C or above in a protective atmosphere to obtain a three-dimensional porous carbon material block with a self-defined target shape; the carbon source is a thermoplastic polymer, and the pyrolysis auxiliary agent is selected from one or more of zinc group metal oxide powder, zinc group metal nitrate powder and zinc group metal carbonate powder. The pyrolysis auxiliary agent is added into the carbon source, zinc oxide is generated in the pyrolysis process, the carbonization process of the carbon source material is converted into a solid state from a molten state, melt flow of a polymer material is inhibited, and the prepared block porous carbon material is excellent in mechanical stability and chemical stability.

The present disclosure generally relates to a method for producing a crystalline NFPP material comprising: a) providing an NFPP precursor material; b) combusting the NFPP precursor material at a temperature of from 200°C to 700°C for 5 to 90 minutes, preferably from 5 to 30 minutes, to yield a carbon coated NFPP material; c) grinding the carbon coated NFPP material into particles; and d) heating the particles obtained in step c) at a temperature of from 400°C to 800°C to yield a crystalline NFPP material, wherein step a) of providing the NFPP precursor material comprises: i) providing an aqueous mixture by mixing a metal nitrate (MeNO3) with sodium dihydrogen phosphate (NaH2PO4) and ascorbic acid (C6H4O2(OH)4), ii) adding citric acid (C6H8O7) to the aqueous mixture, iii) heating the aqueous mixture obtained in step ii) to yield the NFPP precursor material. The present disclosure also relates to a crystalline NFPP material obtained by the method and to a cathode comprising the crystalline NFPP material. Furthermore, the present disclosure relates to a sodium ion battery cell comprising the cathode.

The invention belongs to the technical field of high-entropy metal oxide nano powder materials, and particularly relates to a novel high-entropy metal oxide material for a negative electrode of a lithium ion battery and a preparation method of the novel high-entropy metal oxide material. On the basis of a solution combustion synthesis technology, a redox reaction system is constructed by adopting metal nitrate and organic fuel (such as citric acid, urea and the like), three spinel type high-entropy metal oxide nano powder materials with good electrochemical performance are provided and comprise (FexCoyNizCrmLin) 3O4, (FexCoyNizCrmLinZnq) 3O4 and (FexCoyNizCrmLinMgq) 3O4, the ratio of x: y: z: m: n: q is (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1), and the reversible specific capacity can reach 442.2-1190.3 mAhg <-1 > after 400 cycles under the current density of 500 And the rapid synthesis process significantly shortens the time required by traditional sintering, the obtained powder product also has the characteristics of narrow particle size distribution, high grain boundary purity, excellent chemical uniformity and the like, and an effective preparation way is provided for developing a high-performance electrode material.

The invention discloses a fused salt phase change heat storage composition as well as a preparation method and application thereof, and belongs to the technical field of heat storage. The fused salt phase change heat storage composition provided by the invention comprises the following components: a fused salt material, the melting point of the fused salt material is 100-1500 DEG C, and the absorption coefficient of the fused salt material to infrared waves is 0-100m <-1 >; the infrared absorbing material comprises at least one of transition metal chlorine salt, metal carbonate, metal sulfate, metal nitrate, a carbon-based material, silicon carbide and spinel. The fused salt phase change heat storage composition provided by the invention has high heat exchange power (average heat release power) and heat storage energy density. The invention further provides a preparation method and application of the fused salt phase change heat storage composition.

The invention discloses a nitrogen-doped carbon-coated catalyst and a preparation method and application thereof, and the preparation method of the nitrogen-doped carbon-coated catalyst comprises the following steps: 1, dissolving anhydrous zinc chloride in a solvent, and adjusting the pH value of the mixed solution to 9.5-11.5; adding 1H-1, 2, 3-triazole, and stirring at room temperature, so as to obtain an MET-Zn precursor; 2, respectively dissolving the MET-Zn precursor and Fe, Co or Ni metal nitrate in a solvent, then mixing the two solutions, and carrying out ion exchange under the protection of nitrogen to obtain an M-MET precursor subjected to ion exchange; and 3, carbonizing the M-MET precursor subjected to ion exchange in an inert atmosphere to obtain the nitrogen-doped carbon-coated catalyst. The invention provides an application of the nitrogen-doped carbon-coated catalyst in a liquid-phase catalytic hydrogenation reaction of o-chloronitrobenzene. The nitrogen-doped carbon-coated catalyst has the characteristics of high catalytic activity, selectivity and stability and capability of being magnetically recycled.

The application discloses a kind of metal-loaded starch aerogel and its preparation method and application, comprising the following steps: (1) starch and water are prepared into starch milk, starch milk is heated, and gelatinized starch solution is obtained;(2) sodium laurate is added to the gelatinized starch solution and heated to react, and after the reaction is completed, starch-sodium laurate complex solution is obtained;(3) metal nitrate solution is added to the above-mentioned complex solution, and after stirring uniformly, a reducing agent is added to reduce metal ions, and metal-loaded starch hydrogel is obtained;(4) the above-mentioned hydrogel is pre-frozen and freeze-dried to obtain metal-loaded starch aerogel.The metal-loaded starch aerogel of the application has excellent ethylene adsorption capacity, with an adsorption capacity of about 32 mL / g, good adsorption stability, and the adsorption process can be carried out at normal temperature and pressure, which can be used for fruit preservation.

The invention discloses a preparation method of a high-entropy layered oxide, which comprises the following steps: 1) weighing metal nitrate and an organic compound, adding deionized water, stirring and dispersing to form a uniform complex; 2) transferring the complex to Joule thermal equipment, and further performing Joule thermal reaction to obtain a high-entropy layered oxide precursor; 3) grinding and uniformly mixing the high-entropy layered oxide precursor prepared in the step 2), a sodium source and a lithium source to obtain solid powder; and 4) placing the solid powder in Joule thermal equipment for Joule thermal reaction to obtain the high-entropy layered oxide powder. According to the method, metal nitrate is adopted as an oxidizing agent, an organic compound is adopted as a reducing agent, a violent oxidation-reduction reaction occurs during Joule thermal reaction, a large amount of gas and heat are released, metal cations are rapidly diffused, and uniform high-entropy layered oxide is formed. The high-entropy layered oxide has relatively high specific surface area, good crystallinity and excellent electrical properties.

The invention provides an efficient composite diaphragm for hydrogen production through alkaline electrolysis of water and a preparation method of the efficient composite diaphragm, and belongs to the technical field of hydrogen production through electrolysis of water. The preparation method comprises the following steps: S110, dissolving a polymer raw material in a solvent, stirring and mixing to form a spinning solution; s120, preparing a polymer non-woven fabric from the spinning solution through a flash evaporation method; s130, the polymer non-woven fabric is sequentially soaked in a strong alkali solution and a metal chlorate or metal nitrate solution, and conductive inorganic particles are formed on the surface and in pore channels of the polymer non-woven fabric after roasting; and S140, repeating the step S120 and the step S130 for multiple times, and cleaning the membrane material to obtain the porous composite membrane. The polymer non-woven fabric prepared by adopting a flash evaporation method is used as a diaphragm framework, the thickness of the diaphragm is greatly reduced while the high mechanical strength of the diaphragm is ensured, and the resistance of the diaphragm is further reduced, and then conductive inorganic particles are grown on the surface of the polymer non-woven fabric and in pore channels by adopting an in-situ chemical deposition method. The preparation process is simple, and industrial amplification is easy.

The invention discloses an electrolyte, a lithium battery and electric equipment. The electrolyte comprises a solvent, a lithium salt and an additive, the additive comprises crown ether, alkali metal nitrate and cyclic lactone, and the alkali metal nitrate comprises at least one of potassium nitrate, rubidium nitrate and cesium nitrate. The electrolyte can form an SEI film with an inorganic-polymer composite structure on the surface of lithium metal, and the inorganic SEI film layer improves the uniformity of lithium ion transmission and inhibits the generation of lithium dendrites; the toughness of the SEI film is improved by the polymer part, and the damage of volume change to the integrity of the SEI film is reduced. Meanwhile, according to the scheme, the fast charging capacity of the electrolyte can be improved, and high-rate charging and discharging of the lithium metal battery can be achieved. Therefore, the electrolyte can stably act for a long time, and can tolerate the volume change of lithium metal.

The invention discloses a high-entropy perovskite oxide, a preparation method thereof and application of the high-entropy perovskite oxide as an electrocatalyst, and belongs to the technical field of high-entropy transition metal oxides. A sol-gel method is adopted, various metal nitrates and lanthanum nitrate are dissolved in water and ethylene glycol in an equimolar mode, and an ammonium citrate complexing agent is added. And then heating at 120 DEG C for 10 hours. And heating the obtained gel precursor to 600 DEG C in a muffle furnace at a heating rate of 10 DEG C / min, maintaining the temperature for 2 hours, and cooling to obtain the high-entropy perovskite oxide LaBxO3. The high-entropy perovskite oxide electrocatalyst which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained, and the electrocatalyst can be applied to electrocatalytic nitrate radical reduction and sulfur ion oxidation; and a foundation is laid for developing other high-entropy transition metal oxides as electrocatalysts for synthesizing value-added chemicals by electrocatalyzing nitrate radicals and sulfur-containing wastewater.

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.

The application discloses a high-activity alkaline electrolytic water oxygen evolution reaction catalyst based on transition metals and a preparation method and application thereof, and belongs to the fields of new energy technologies and electrocatalytic material applications.The electrocatalyst is expressed by a chemical formula of Ni m Fe n LDH / CeO 2‑x / NF.The preparation method comprises the following steps: dissolving a nitrate precursor containing a Ce element in deionized water, then performing electrodeposition on a foam nickel which has been treated in advance, placing the foam nickel in a corresponding transition state metal nitrate solution containing Ni and Fe after high-temperature annealing treatment, and finally performing a hydrothermal reaction to obtain the electrocatalyst. m Fe n LDH / CeO 2‑x / NF.The oxygen evolution performance of the electrocatalyst is obviously superior to that of single-metal-based Ni LDH / CeO 2‑x / NF, single-layer Ni m Fe n LDH / NF and Ni m Fe n LDH / CeO2.The main reasons for improving the oxygen evolution activity of the catalyst are that the catalyst introduces low-spin Fe doping, formation of a heterojunction interface and creation of multi-oxygen vacancies.Meanwhile, the material exhibits sustained high stability, and the design of the catalyst provides technical feasibility for large-scale electrolytic water hydrogen production.

The invention belongs to the technical field of catalysts, and discloses a fluorite type high-entropy oxide catalyst and a preparation method and application thereof.The molecular formula of the fluorite type high-entropy oxide catalyst is shown as x% ZnO / AO2, A is ions of five transition metal elements including Ce, Zr, Y, La and Ti, and the five transition metal elements are equal in molar content; the configuration entropy Sconfig of the fluorite type high-entropy oxide catalyst is greater than or equal to 1.61 R; wherein the molar fraction x% of the auxiliary agent ZnO is in a range of 0-30%; the preparation method comprises the following steps: dissolving metal nitrate containing A-type elements, zinc nitrate, citric acid and ethylene glycol in distilled water to obtain a mixed solution; stirring the mixed solution to obtain gel, and calcining the dry gel to obtain the fluorite type high-entropy oxide catalyst. The high-entropy oxide AO2 and ZnO serving as an auxiliary are applied to the reverse water-gas shift reaction of carbon dioxide as catalysts, and good activity, selectivity and stability are shown.

The invention provides a preparation method of a copper-based alloy quantum dot / metal oxide composite catalyst and application of the copper-based alloy quantum dot / metal oxide composite catalyst to photocatalytic CO2 reduction, and belongs to the technical field of catalysts, and the catalyst is prepared by depositing copper nitrate and other metal nitrate in different molar ratios on a metal oxide substrate through light induction. The Cu-M alloy has a nano-sized quantum dot structure, and the composite catalyst shows excellent photocatalytic carbon dioxide (CO2) reduction performance and especially has high selectivity to methane (CH4). The catalyst provided by the invention is simple and convenient in preparation process, low in cost and environment-friendly, and has efficient catalytic activity and good cycle stability. The method is expected to have a wide application prospect in the fields of photocatalytic CO2 reduction, methane production and the like, and has an important promotion effect on clean energy development and environmental governance.

The invention relates to a metal-doped modified calcium-based material based on MOF as well as a preparation method and application of the metal-doped modified calcium-based material. The preparation method of the metal-doped modified calcium-based material based on the MOF comprises the following steps: (1) mixing and dissolving an organic ligand and N, N-dimethylformamide to obtain a precursor solution; adding metal nitrate into the precursor solution, and stirring to obtain a mixed solution; (2) carrying out heat treatment on the mixed solution to obtain white crystal powder; cleaning the white crystal powder, centrifugally separating, collecting solid precipitate, and drying to obtain white solid; and (3) grinding the white solid into powder, and calcining to obtain the metal-doped modified calcium-based material based on MOF. According to the preparation method disclosed by the invention, the pore limiting effect of MOF is utilized, the metal oxide is kept unchanged in the high-temperature calcination process, and the organic ligand is decomposed to release small molecules, so that a highly dispersed porous structure is formed, and the CO2 adsorption performance and the sintering resistance of the material are remarkably improved.

The invention discloses a method for synthesizing sustainable aviation kerosene through CO2 hydrogenation in biogas. The method comprises the following steps: taking Fe / Mn-CaO as a CO2 adsorption separating agent, taking NiMoGa ternary liquid metal as a catalyst for methane decarbonization hydrogen production, and taking a metal oxide-molecular sieve as a catalyst for synthesizing aryl aviation kerosene through CO2 hydrogenation. According to the metal oxide-molecular sieve catalyst for synthesizing the aromatic sustainable aviation kerosene through CO2 hydrogenation, a metal oxide (ABO3) with a perovskite structure is synthesized through a sol-gel method, and the metal oxide (ABO3) is physically mixed with a molecular sieve; a in ABO3 is lanthanum, and a B element comprises iron, chromium, cobalt or nickel; the molecular sieve contains ZSM-5 (Zeolite Socony Mobil-5), ZSM-11 (Zeolite Socony According to the oxide catalyst disclosed by the invention, a polydentate chelate is formed by metal nitrate and citric acid, and a special perovskite structure can be formed through simple drying and roasting, so that the oxide catalyst has excellent carburization resistance, and a formed oxygen-containing intermediate is diffused into a zeolite molecular sieve to form aromatic aviation kerosene; the preparation of aryl aviation kerosene from bio-based CO2 hydrogenation is realized.

The invention provides a preparation method and a low-temperature spray freeze-drying dispersion method of ultra-long BNNT, a boron source, metal nitrate and nano metal oxide are uniformly mixed, mixed gas is introduced, heating annealing is performed to prepare the ultra-long BNNT, the diameter of the prepared ultra-long BNNT is 50-150 nm, the tube length of the BNNT is 100-500 [mu] m, and the wall thickness of the BNNT is 10-30 nm; the mixed gas is nitrogen and ethanol. The agglomeration effect of the nanotube powder is not obvious, the freeze-drying efficiency of the nanotube powder is greatly improved, and the homogeneous dispersion process of the prepared BNNT is simple in process, high in efficiency and good in uniformity and has great industrialization advantages.

The invention discloses a preparation method of an SCR (Selective Catalytic Reduction) denitration catalyst, which belongs to the technical field of denitration catalysts and comprises the following steps: mixing and stirring composite gel, a metal nitrate compound and deionized water to obtain slurry; and dipping the pretreated foamed nickel into the slurry, stirring, calcining, and cooling to room temperature to obtain the medium and low temperature SCR denitration catalyst. The dispersity of the modified graphene oxide and the modified carbon fiber in the denitration catalyst is improved by the composite gel; the composite gel and the metal nitrate are compounded to form slurry to be adsorbed into a porous structure of the foamed nickel, a lignin cross-linked network mechanism in the composite gel contains a large number of hydroxyl sites, adsorption sites are provided for active components in the metal nitrate, the active components are evenly dispersed on the composite gel, and the adsorption efficiency is improved. The contact area of the catalyst and nitrogen oxide is increased.

The invention discloses a gas generating agent and a safety airbag. The gas generating agent comprises a combustible agent, an oxidizing agent and a framework composition; the backbone composition includes a combination of carbides, and metal nitrates and / or metal oxides. The gas generating agent is prepared by combining the substances, and a large amount of gas is emitted by utilizing rapid combustion of the combustible agent and the oxidizing agent, so that the interior of the air bag is rapidly inflated; the framework composition in the gas generating agent can quickly form a smoke and fire framework in an integral block shape after combustion, on one hand, the smoke and fire framework has an integral block-shaped structure, so that the weight of a filter screen can be reduced, or the filter screen is not used, and on the other hand, the smoke and fire framework can also adsorb smaller combustion residues, so that the gas discharged into the air bag is cleaner.

The invention relates to a catalyst for treating nitrogen-containing VOCs and application thereof in treatment of nitrogen-containing VOCs, the main preparation steps are as follows: a carrier component containing Si, Al and optional Mg, a cross-linking agent, a rare earth oxide and water are put in a ball mill for ball milling to prepare coating slurry, the coating slurry is coated in cordierite honeycomb ceramic channels by a vacuum coating method, and the catalyst is prepared. And then the coated honeycomb ceramic is quickly dried. Preparing a metal nitrate solution as an impregnation liquid, impregnating the nitrate on the dried honeycomb ceramic, aging, quickly drying the impregnated honeycomb ceramic, and roasting the dried honeycomb ceramic for a certain time to obtain the catalyst. According to the preparation method disclosed by the invention, the catalyst for treating the nitrogenous VOCs, which is formed in a honeycomb manner, low in preparation cost, relatively high in N2 selectivity, good in catalytic oxidation effect and high in stability, can be produced, so that the problems of long technological process, short service life of the catalyst, secondary pollution of NOx and the like in the conventional process for treating the nitrogenous VOCs are solved.

The invention belongs to the related technical field of preparation of inorganic nano materials, and particularly relates to a preparation method of a bifunctional material for storage-in-situ oxidation of VOCs (volatile organic compounds), the preparation method takes ZSM-5 as a substrate material, an ion exchange method is used for modification, and the preparation method comprises the following steps: adding a pretreated commercial H-type molecular sieve into a metal nitrate solution, and stirring to obtain a mixed solution; stirring and reacting under a water bath condition, and then filtering, washing, drying and calcining to obtain the bifunctional material. The method disclosed by the invention has the advantages of simple process, low cost and the like, and the prepared bifunctional material has excellent storage-in-situ oxidation performance on toluene.

The invention relates to the technical field of catalysts, in particular to a transition metal porous nanosheet catalyst for synthesizing deuterated methanol and a preparation method of the transition metal porous nanosheet catalyst. The preparation method comprises the following steps: adding metal nitrate into a mixed solution of water and ethylene glycol, adding a surfactant and urea in the stirring process, and stirring until the metal nitrate is completely dissolved; s2, aging the reaction solution in the step S1 for a period of time, then reacting the reaction solution at 120-160 DEG C for 6-18 hours, washing and drying to obtain a catalyst precursor; and roasting the catalyst precursor for 2-4 hours at the temperature of 200-400 DEG C to obtain a Cu-Ni-Zn-Mg mixed metal oxide. The prepared transition metal porous nanosheet catalyst has excellent activity on synthesis of deuterated methanol through reaction of deuterium gas and carbon monoxide, can inhibit condensation of deuterated methanol and higher alcohol generation reaction, and effectively improves the selectivity of generation of deuterated methanol, and the selectivity reaches 94% or above.

This invention discloses a process for preparing ultrafine glass powder using a spray pyrolysis method in the field of glass encapsulation materials. The process first prepares a homogeneous solution A using boric acid, aluminum nitrate nonahydrate, alkaline earth metal nitrates, lithium acetate, sodium acetate, and potassium acetate. Tetraethyl orthosilicate is dissolved in anhydrous ethanol to obtain solution B. A rare earth transition metal composite oxide nanoclusters encapsulated with a silica shell hybrid inorganic modifier is dispersed in anhydrous ethanol to obtain suspension C. Solution B and suspension C are mixed, and deionized water and hydrochloric acid are added to adjust the pH. After pre-hydrolysis and cooling, triethyl borate is added dropwise for co-condensation, and then mixed with solution A. After adjusting the pH and aging, the mixture is ultrasonically atomized and spray pyrolyzed to obtain ultrafine glass powder. The glass powder obtained by this invention has small particle size, high sphericity, and can be continuously produced.

The application discloses a preparation method of a metal oxide passivation film on a gallium nitride surface; the method comprises the following steps: mixing a metal nitrate precursor solution and a hole sacrificial agent to obtain a mixed solution; placing a substrate containing a GaN layer into the mixed solution and performing photochemical deposition under ultraviolet light to obtain a metal oxide passivation film formed on the surface of the GaN layer. The preparation method uses a metal nitrate as a precursor, and under ultraviolet light, photo-generated electrons and holes of the GaN are used to initiate a redox reaction at a solid / liquid interface to form a uniform and dense metal oxide passivation film. The method is simple in process, is performed at room temperature, does not need vacuum, has small interface damage, can be used to reduce the trap state density of the GaN surface, improve the interface stability and reliability of a device, and is suitable for surface / interface passivation treatment of power electronic and ultraviolet photoelectric devices.

The preparation method for growing the metal organic framework on the dendritic porous silicon dioxide comprises the following steps: treating the dendritic silicon dioxide by using organosilane and anhydride in sequence to obtain carboxyl-functionalized dendritic porous silicon dioxide. And growing a metal organic framework on the surface of the carboxyl functionalized dendritic porous silicon dioxide by using a metal nitrate solution. The preparation method is simple and controllable, the synthesized dendritic porous dioxide-metal organic framework composite material has large metal organic framework loading capacity, and the metal organic framework material has regular growth morphology on the surface of dendritic silicon dioxide, shows excellent corrosion resistance, and has good application prospects. Good application prospects are realized in the field of intelligent anti-corrosion coatings.