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

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 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 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 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.