32results about How to "Regular crystal structure" patented technology

The invention relates to a high-energy-storage-density strontium-sodium-niobate-base glass ceramic energy storage material, and preparation and application thereof. The strontium-sodium-niobate-base glass ceramic energy storage material comprises SrO, Na2O, Nb2O5 and SiO2 in a mole ratio of 42x:42(1-x):28:30. The preparation method comprises the following steps: weighing the raw materials, mixing by ball milling, drying, and carrying out high-temperature melting to obtain a high-temperature melt; and casting the high-temperature melt into a preheated metal mold, carrying out stress-relief annealing to obtain transparent glass, cutting the transparent glass into glass sheets with the thickness of 0.9-1.2mm, and carrying out controlled crystallization to obtain the product. The product is applicable to an energy storage capacitor material. Compared with the prior art, the preparation method provided by the invention is simple, does not need complicated after-treatment steps, and is economical and practical. The prepared glass ceramic energy storage material has higher breakdown field strength resistance (2402kV / cm), and the energy storage density of the material is obviously enhanced to 16.86J / cm<3>. The strontium-sodium-niobate-base glass ceramic energy storage material is applicable to an energy storage capacitor material.

The invention provides a preparation method of silver powder with low heat shrinkage rate. The preparation method comprises the steps that a silver nitrate water solution and a reducing agent solutionare simultaneously added into a dispersing agent water solution to obtain silver powder particles, then after the surface of the silver powder is coated with a surfactant, the silver powder particlesproduce mutual impact, collision and friction shearing by jet stream, so as to achieve the surface smoothness and dispersion treatment of the silver powder, finally a high-energy pulse current is utilized to provide high energy in a very short time to promote the recrystallization of the silver powder in a faster way at a lower temperature, the crystal defects of the silver powder is improved, and the silver powder particles are prevented from agglomerating. The heat shrinkage rate of the prepared silver powder is less than 5% at 700 DEG C, good degree of sphericity and dispersity are achieved, the particle size D100 is not more than 5 [mu]m, the tap density is not less than 4 g / cm<3>, and a broad application prospect in the field of miniaturization and high-reliability circuits is achieved.

The invention relates to a strontium barium niobate-based glass ceramic energy storage material and a preparation method thereof. The strontium barium niobate-based glass ceramic energy storage material is prepared from BaCO3, SrCO3, Nb2O5, SiO2, Al2O3 and B2O3 in a molar ratio of 20:20:20:(30-35):5:(0-5). The preparation method of the strontium barium niobate-based glass ceramic energy storage material comprises the following steps: carrying out ball milling and mixing, drying, then melting at high temperature, rapidly pouring high-temperature melt into a copper mould to be moulded, then carrying out stress relief annealing, cutting into glass slices with the thickness of 1.5mm, and finally carrying out controlled crystallization, so that the strontium barium niobate-based glass ceramic energy storage material is obtained. Compared with similar materials, the strontium barium niobate-based glass ceramic energy storage material has excellent machining property and can be processed into slices with the thickness below 150Mum through mechanical polishing, thereby being convenient for follow-up processing of small devices; meanwhile, the strontium barium niobate-based glass ceramic energy storage material has excellent dielectric property and resistance to breakdown field strength, and energy storage density of the strontium barium niobate-based glass ceramic energy storage material can reach 7.4J / cm<3>.

Provided is a preparation method for micrometer barium-doped zinc oxide. According to the method, barium-doped zinc oxide materials with three micrometer structures, namely, a clavate, a flower-like and a hexaprismatic double layer structure, are prepared with polyvinylpyrrolidoneK-30 as a template, zinc acetate dihydrate as a zinc source and barium chloride dihydrate as a structural modificationagent and doping agent by controlling the concentration of reactants, hydro-thermal growth time and reaction temperature. The micrometer barium-doped zinc oxide material prepared in the invention hasthe characteristics of high purity, a standardized crystal structure, good controllability in morphology and a short production period, and has a significant application prospect in fields like fuel cells, photoelectric conversion materials and chemical sensors.

The invention discloses a carbonizer for producing nano calcium carbonate. The carbonizer comprises a calcium hydroxide blending tank, a calcium hydroxide slurry storage tank, a primary carbonization nucleation reactor, a primary carbonization growth reactor, a primary carbonization ageing tank, a secondary carbonization tubular reactor and a calcium hydroxide activating tank; and a slurry carbonization reaction tube and a carbon dioxide porous reaction tube which have two-end uninterrupted repeated arch structures are arranged in the primary carbonization nucleation reactor, the primary carbonization growth reactor and the secondary carbonization tubular reactor respectively. By the method for producing the nano calcium carbonate through the carbonizer, the calcium carbonate can be produced by the nucleation stage and the growth stage, and is controlled stepwise, the reaction degree of the whole carbonization process can be monitored, the nano calcium carbonate with uniform particle size distribution, regular crystal structures and stable quality can be produced, and the invention has the advantages of small equipment investment, short carbonization time, low energy consumption and the like.

The invention provides a high-nickel ternary positive electrode material and a preparation method thereof. The preparation method of the high-nickel ternary positive electrode material comprises the following steps of placing a high-nickel ternary precursor in a roasting furnace or a rotary kiln with a stirring function, carrying out low-temperature dehydration presintering while stirring is performed, and acquiring high-nickel ternary oxide; weighing a lithium source and a high-nickel ternary oxide according to a molar ratio of n (Li) / n (Ni+Co+Mn) of 1.03-1.20 respectively, and premixing to obtain a mixture; putting the mixture into the roasting furnace with the stirring function, and carrying out two-stage roasting while stirring; and washing, drying and secondarily sintering the roasted material to obtain the high-nickel ternary positive electrode material. According to the method, the original morphology of the high-nickel ternary precursor can be maintained, and the uniformity, the cycling stability and the rate capability of the high-nickel ternary positive electrode material are greatly improved.

The invention provides a lithium iron phosphate composite material coated with a ternary carbon source and a preparation method of the material and belongs to the technical field of positive materials for lithium ion cells, aiming at the defects of poor conductivity and low tap density of lithium iron phosphate. The invention provides a modification method of the lithium iron phosphate composite material coated with the ternary carbon source according to the characteristics including pyrolysis characteristics, carbonization degrees, dispersion manners, residual carbon structures, reduction activity and the like of different carbon sources, based on a process and reaction process of preparing the lithium iron phosphate by using a carbon heat reduction method; micro-molecular water-soluble organic matters, high-molecular polymers, graphene compounds, iron source compounds, phosphorus source compounds and lithium source compounds are ball-grinded and homogenized and then are dried to prepare a composite precursor; then the composite precursor is sintered to obtain the lithium iron phosphate composite material. According to the lithium iron phosphate composite material coated with the ternary carbon source, the problems that the conductivity of the lithium iron phosphate composite material is low, the lithium ion diffusion coefficient is low, the tap density is low, and the like are solved.

The invention relates to the technical field of preparation of hydrotalcite-like compounds, and discloses a pure cobalt hydrotalcite-like compound and a preparation method thereof. A constant pH precipitation method is adopted, cobalt nitrate serves as a cobalt source, a mixed solution of methyl alcohol and water (the volume ratio is 1: 1-8: 1) serves as a solvent, the cobalt nitrate solution is slowly dropwise added into a sodium carbonate solution at the room temperature, the pH of the solution is adjusted to be 8-12, and the pure cobalt hydrotalcite is obtained through the steps of hydrothermal aging, suction filtration, washing, drying and the like. The hydrotalcite-like compound is single in crystalline phase, regular in structure and good in layered structure and flaky morphology, the average thickness of nanosheets ranges from 5.9 nm to 12.8 nm, and the high crystallinity degree is achieved. The preparation process is simple and easy to operate, the raw materials are cheap and easy to obtain, the preparation conditions are mild, the period is short, the purity and the yield of the hydrotalcite-like compound are high, and quantitative synthesis can be realized.

The invention discloses a preparation method of a ZnIn2S4 photocatalyst by hydrothermal synthesis of ionic liquid microemulsion. The preparation method comprises the following steps: (1) adding a sulfur source into the ionic liquid and a surfactant, heating, and stirring until the sulfur source is dissolved to obtain a mixture A; (2) fully dissolving a divalent zinc salt and a trivalent indium salt in deionized water to obtain a mixture B; (3) transferring and mixing the mixture A and the mixture B in an autoclave having polytetrafluoroethylene lining and uniformly stirring; (4) closing the autoclave, placing the autoclave at 50-90 DEG C and reacting for 4-24 hours and naturally cooling at room temperature to obtain a yellow precipitate; and (5) respectively washing the yellow precipitate with deionized water and anhydrous ethanol, transferring to a drying oven and drying overnight at 40-90 DEG C to obtain the final product. The preparation process is simple, rich in raw materials and low in cost, and the product has the advantages of large specific surface area, high catalytic activity and high hydrogen generation efficiency.

The invention relates to a high-energy-storage-density strontium-sodium-niobate-base glass ceramic energy storage material, and preparation and application thereof. The strontium-sodium-niobate-base glass ceramic energy storage material comprises SrO, Na2O, Nb2O5 and SiO2 in a mole ratio of 42x:42(1-x):28:30. The preparation method comprises the following steps: weighing the raw materials, mixing by ball milling, drying, and carrying out high-temperature melting to obtain a high-temperature melt; and casting the high-temperature melt into a preheated metal mold, carrying out stress-relief annealing to obtain transparent glass, cutting the transparent glass into glass sheets with the thickness of 0.9-1.2mm, and carrying out controlled crystallization to obtain the product. The product is applicable to an energy storage capacitor material. Compared with the prior art, the preparation method provided by the invention is simple, does not need complicated after-treatment steps, and is economical and practical. The prepared glass ceramic energy storage material has higher breakdown field strength resistance (2402kV / cm), and the energy storage density of the material is obviously enhanced to 16.86J / cm<3>. The strontium-sodium-niobate-base glass ceramic energy storage material is applicable to an energy storage capacitor material.

The invention belongs to the technical field of petroleum processing, and relates to a method for preparing a catalytic cracking light gasoline aromatization catalyst; the preparation method of the catalyst mainly includes modification of nano ZSM-5 molecular sieves, preparation of a carrier, preparation of a catalyst, etc., and the prepared catalyst It can minimize the low-carbon olefins in catalytic cracking light gasoline and ensure that the octane number does not decrease or even increase. The present invention comprehensively considers the characteristics of reducing the content of low-carbon olefins to produce aromatization catalysts rich in aromatics, the activity, selectivity and stability of the prepared catalyst are well distributed, the experimental operation is simple, and the process can be changed in a wide range condition.

The invention relates to the technical field of preparation of hydrotalcite-like compounds, and discloses a pure cobalt-like hydrotalcite compound and a preparation method thereof. Using the constant pH precipitation method, using cobalt nitrate as the cobalt source, methanol-water (volume ratio 1:1–8:1) mixed solution as the solvent, slowly add the cobalt nitrate solution to the sodium carbonate solution at room temperature and adjust the pH of the solution =8–12, after hydrothermal aging, suction filtration, washing, drying and other steps, pure cobalt-based hydrotalcites can be obtained. The hydrotalcite-like crystal phase is single, the structure is regular, and it presents a good layered structure and sheet morphology. The average thickness of the nanosheets is 5.9-12.8 nm, and it has a high degree of crystallinity. The preparation process of the invention is simple and easy to operate, the raw materials are cheap and easy to obtain, the preparation conditions are mild, the cycle is short, the purity and yield of the hydrotalcite-like stone are high, and the quantitative synthesis can be realized.

The present invention discloses a vanadium-phosphorus oxide and a preparation method thereof, wherein the grain size of the vanadium-phosphorus oxide is less than 100 nm, and the grain size distribution adopting the volume as the benchmark is that the content of the particles with the grain size of less than 15 nm is 9-15%, the content of the particles with the grain size of 15-30 nm is 62-80%, and the content of the particles with the grain size of 30-100 nm is 11-23%. According to the present invention, the nanometer vanadium-phosphorus oxide is prepared by using an immersion circulating type impinging stream reactor, and a silane coupling agent is added to obtain the vanadium-phosphorus oxide with characteristics of small grain, concentrated grain size distribution and large specific surface area; and the octahedron structure of the vanadium-phosphorus oxide crystal phase is regular, the active crystal face (020 crystal face) exposure is large, the activity of the catalyst prepared from the precursor is high, and with the application of the vanadium-phosphorus oxide of the present invention to catalyze the maleic anhydride preparation reaction through the n-butane oxidation, the n-butane molar conversion rate can achieve 90-95%, and the maleic anhydride selectivity can achieve 75-88 mol%.

The invention relates to a chemical extraction method of agricultural waste, particularly a method for extracting cellulose from tobacco waste based on a reductant-oxidant, comprising the following steps: crushing the dried tobacco waste, putting the crushed waste in water to immerse for no less than 6 h to obtain a pretreatment liquid; carrying out solid-liquid separation on the pretreatment liquid and taking the solids, adding a reductant-oxidant solution having the volume of 3-150 times of the volume of the tobacco waste and having the volume percentage of no less than 3%, reacting for at least 15min at 20-90 DEG C to obtain a reaction solution, carrying out solid-liquid separation on the reaction solution, and taking the filter residues, wherein the filter residues are cellulose. The method has the advantages of simple process, energy saving and environmental protection. Compared with the methods for processing tobacco cellulose by traditional acid, alkali activation treatment and other physicochemical treatment, the production cost can be greatly reduced.

The invention discloses a Mo-Eu co-doped titanium dioxide / aluminum phosphate molecular sieve composite photocatalyst. The aluminum phosphate molecular sieve is used as a carrier, and the Mo-Eu co-doped titanium dioxide nano-microsphere is used as an active component. The preparation method includes the following steps. : prepare the nano-microsphere active ingredient of Mo-Eu co-doped titanium dioxide; mix ionic liquid, phosphoric acid, aluminum source, organic amine, and hydrofluoric acid evenly; mix the Mo-Eu co-doped titanium dioxide nano-microsphere prepared in step S1 The spherical active ingredient is added to the mixed solution in step S2, and the mass fraction ratio of each substance in the mixture is: ionic liquid: phosphoric acid: aluminum source: organic amine: hydrofluoric acid: Mo-Eu co-doped titanium dioxide nano-microsphere activity Composition=10‑12:2‑3:1:5‑6:0.5‑0.8:0.3‑0.5; the mixture was crystallized at 350‑400℃ for 30‑50min; centrifuged, washed, dried, and calcined. The Mo-Eu co-doped titanium dioxide / aluminum phosphate molecular sieve composite photocatalyst provided by the invention can efficiently degrade the pollutants of printing and dyeing wastewater under the action of visible light, and the catalyst usage amount is small.

The invention relates to a lanthanum oxide doped strontium-barium niobate based glass ceramic energy storage material and a preparation method thereof. The preparation method includes: blending according to a molar ratio of 20BaCO3-20SrCO3-20Nb2O5-33.5SiO2-5Al2O3-1.5B2O3-xLa2O3; after barreling and mixing, drying, and melting at high temperature; quickly pouring high-temperature melt into a copper die for forming; destressing and annealing at certain temperature, cutting into glass sheets, and performing controlled crystallization to obtain the lanthanum oxide doped strontium-barium niobate based glass ceramic energy storage material. Compared with similar materials, the glass ceramic energy storage material has excellent machining performance, and can be mechanically ground and processed into sheets with thickness lower than 80 um, and convenience is brought to subsequent machining of small devices; the glass ceramic energy storage material has excellent dielectric performance and breakdown field strength resistance.

The invention discloses an insulating oxidation-resistant plastic-coated pipe and a preparation method thereof, and relates to the technical field of new materials. The preparation method comprises the specific steps of reacting 2-[4-(3a, 7a-dihydro-3H-indole-2-ethyl) phenyl]-3H-indole with 2-diphthalic anhydride-1, 3-propane hexafluoride, and modifying by using a rare earth solution so as to obtain a polyimide liquid crystal; reacting the prepared perfluorinated succinic anhydride with sodium peroxide, and purifying so as to prepare perfluorinated acyl peroxide; catalyzing by using a sodium hydroxide solution, initiating bisphenol A and epoxy chloropropane to polymerize by using perfluoroacyl peroxide, and then adding polyimide liquid crystal to prepare fluorinated epoxy resin; and carrying out thermal spraying on the pretreated stainless steel pipe by using aliphatic amine polyether, fluorinated epoxy resin, polyimide liquid crystal and a mixed additive, and curing to obtain the insulating oxidation-resistant plastic-coated pipe. The plastic-coated pipe prepared by the preparation method disclosed by the invention has relatively high insulating property and oxidation resistance, and also has extremely excellent toughness.

The present invention provides a preparation method for a novel nitrogen-rich ZMOF type metal-organic framework porous material. According to the preparation method, an azole-rich compound is adopted as a reaction ligand, and the azole-rich compound and a Zn<2+>-containing soluble zinc salt are subjected to a solvothermal reaction in an organic solvent to obtain a nitrogen-rich ZMOF type metal-organic framework porous material; and then washing, evacuation and high temperature activation are performed to remove the organic solvent from the nitrogen-rich ZMOF type metal-organic framework porous material. The nitrogen-rich ZMOF type metal-organic framework porous material prepared by the method has characteristics of regular crystal structure, uniform pore size distribution, good physical and chemical stability, and excellent selective CO2 absorption capacity, such that the method has good application prospects in technical fields of CO2 capture separation, organic molecule separation, and the like.

The invention provides a method for preparing silver powder with low thermal shrinkage rate. Silver powder particles are obtained by adding silver nitrate aqueous solution and reducing agent solution to dispersant aqueous solution at the same time. Mutual impact, collision, friction and shearing are used to smooth and disperse the surface of the silver powder. Finally, the high-energy pulse current is used to provide high energy in a very short time, which promotes the recrystallization of the silver powder at a lower temperature and in a faster way, improving the silver powder. Crystal defects and no agglomeration of silver powder particles. The thermal shrinkage rate of the silver powder prepared by the present invention is not more than 5% at 700°C, and has good sphericity and dispersibility, the particle size D100 is not greater than 5 μm, and the tap density is not less than 4g / cm 3 , has broad application prospects in the field of miniaturized and high-reliability circuits.

The invention discloses a vanadium phosphorus oxygen catalyst and a preparation method thereof. The nano-vanadium phosphorus oxide is used as a precursor, and it is obtained by first activating and then forming or first forming and then activating; the grain size of the nano-vanadium phosphorus oxide is less than 100nm, and its grain size distribution is as follows based on volume, The proportion of <15nm particles is 9-15%, the proportion of 15-30nm particles is 62-80%, and the proportion of 30-100nm particles is 11-23%. The nano-vanadium phosphorus oxide is prepared by adding a silane coupling agent in a submerged circulating impingement flow reactor. The catalyst of the invention is used in the catalytic reaction of n-butane oxidation to prepare maleic anhydride, the conversion rate of n-butane can reach 90-95 mol%, and the selectivity of maleic anhydride can reach 75-88 mol%.