38results about How to "Uniform crystal phase" patented technology

The invention belongs to the technical field of preparation of solid materials and particularly relates to a preparation method of a high-performance cerium-zirconium solid solution material. The preparation method comprises the following steps: uniformly mixing metal cerium salt, metal zirconium salt and a surfactant by adopting a spray charging mode; inducing generation of a precipitation by adjusting the charging speed and using a crystal seed generated in the solution; finally, carrying out a hydrothermal aging and roasting process to obtain a cerium-zirconium composite material. According to the preparation method disclosed by the invention, the formation of the precipitation is induced by using tiny crystal seeds generated in an early-stage solution of the precipitation through the spray charging mode and control over the charging speed, so that the uniformity in a precipitating process is improved, and further the formation of a cerium-zirconium solid solution is promoted. The method has the advantages of simple preparation process and low production cost; the prepared cerium-zirconium solid solution has the characteristics of homogenized structure, small particle size, great specific surface area, good stability and the like; moreover, the high-performance cerium-zirconium solid solution material has excellent oxygen storing/discharging property and is the high-performance cerium-zirconium solid solution material with large-scale production and an industrial application prospect.

A Raney nickel catalyst used for low-pressure hydrogenation of dinitrotoluenem. The catalyst is characterized by comprising, by mass, 80-90 wt% of nickel, 5-10 wt% of aluminium and 1.65-10 wt% of an auxiliary agent metal, wherein the nickel is in the form of a simple substance, the aluminium is in the form of the simple substance of an oxide and the auxiliary agent metal is in the form of the oxide. The catalyst is low in price and has an excellent performance of catalytic hydrogenation of the dinitrotoluenem (DNT) without an additional solvent and under a low-pressure condition of 1Mpa.

The invention discloses a charcoal-containing alumina support and a preparation method therefor. The method comprises the following steps: (1) mixing pseudo-boehmite with water, carrying out pulping,adding a mixed acid solution of organic acid and inorganic acid, and carrying out heated refluxing treatment; (2) adding an alkaline nitrogen containing compound into the step (1), carrying out sealedhydrothermal treatment, and subjecting the slurry subjected to the hydrothermal treatment to washing and drying; (3) subjecting a physical pore-enlarging agent and the material obtained in the step (2) to kneading forming, and subjecting the formed substance to drying and roasting, so as to obtain an alumina support; (4) subjecting the alumina support obtained in the step (3) to imbibition with apolyol and/or monosaccharide containing solution, and carrying out drying and roasting; and (5) carrying out microwave treatment on the material obtained in the step (4). The charcoal-containing alumina support prepared by the method is suitable for serving as a hydrotreating support for heavy oil and residual oil, particularly a hydrodemetalization catalyst support, and a hydrodemetalization catalyst prepared from the hydrodemetalization catalyst support not only has relatively high hydrodemetalization activity, but also has good stability.

The invention discloses a dicaryon cadmium organic framework complex as well as a preparation method and application thereof. A chemical formula of the complex is [Cd2(Mu3-cpima)(Mu3-Hcpimda)(H2O)]n,wherein H3cpimada is 1,4-benzoyl-2-propyl-1H-imidazole-4,5-dicarboxylic acid, H2cpiama is another ligand generated by the ligand H3cpimda in reaction through decomposition, namely 1,4-benzoyl-2-propyl-1H-imidazole-4-formic acid. The preparation method comprises the following steps: adding 1,4-benzoyl-2-propyl-1H-imidazole-4,5-dicarboxylic acid and cadmium chloride in the molar ratio of 1:2 into H2O and acetonitrile in the volume ratio of 10:2, and carrying out reaction for 72 hours at the temperature of 160 DEG C in a closed reaction kettle, so that colorless bulk crystals are obtained, and yield is 67%. The complex disclosed by the invention has a two-dimensional skeleton structure, and center metal cadmium (II) ions respectively adopt a hexa-coordinate mode and a seven-coordinate mode. When a light with the wavelength of 340nm is used for exciting the solid-state complex, the emission peak of the complex appears at 400nm, CIE color coordinates are (0.24, 0.21) and are located in a blue light region, and the complex can be applied as an optical material.

The invention a novel continuous charging device used for a single crystal furnace. The novel continuous charging device used for the single crystal furnace comprises a material storage device, a transition device, a fixing device, a liquid exporting device and a heating device and also comprises a batch charging device, wherein the batch charging device is arranged on the upper end of a furnace body; the just lower end of the batch charging device is provided with a material storage device; the material storage device is arranged on the lower end of the furnace body; the inlet end of the transition device is connected with the material storage device; the transition device is arranged on the upper end of the fixing device; the inlet end of the liquid exporting device is connected with theoutlet end of the transition device; the outlet end of the liquid exporting device is arranged on the inner wall of a quartz crucible; the heating device surrounds the outer sides of the transition device and the liquid exporting device. By use of the novel continuous charging device, the problems in the prior art that silicon liquid crystal phase distribution is uneven and silicon liquid consistency is poor after silicon materials are fused are thoroughly solved, pre-charging is not required, charging and material melting time is shortened, silicon rod fusion efficiency and levels are improved, crystal pulling efficiency is improved, labor intensity and production cost are effectively lowered, and meanwhile, the novel continuous charging device is convenient for popularization since input is low.

The invention discloses a method for synthesizing 1,3-butadiene by using a bismuth molybdate catalyst with a nanosheet structure. According to the method, the bismuth molybdate catalyst with the nano-sheet structure is first prepared, and then the nanosheet catalyst is used for the oxidative dehydrogenation of 1-butene to produce 1,3-butadiene. More specifically, a bismuth salt, a molybdenum saltand deionized water are mixed according to a certain molar ratio, the pH value is adjusted by an alkaline solution, the mixture after full stirring is transferred to a PTFE lined container for hydrothermal reaction, the product is subjected to centrifugal separation, washing, drying and roasting, and then the product is subjected to grinding and sieving to obtain the bismuth molybdate catalyst with the nanosheet structure. Compared with a bismuth molybdate catalyst prepared by the traditional co-precipitation method, the catalyst has the nanosheet-shaped morphology, and exhibits better reaction performance in the reaction.

The invention relates to a production technology for a nickel-hydrogen battery electrode material, and particularly discloses a preparation method for a hydrogen storage alloy material; the preparation method comprises the following steps of: a, measuring raw materials according to a proportion; b, sequentially inputting the raw materials into a smelting furnace with argon gas protection accordingto the feeding order of yttrium, lnthanum, cerium, manganese, samarium and nickel; c. removing moisture in the materials; d, removing low boiling point volatiles; e. fully melting the raw materials;f, repeatedly crushing and melting; g, inputting a product into the smelting furnace, wherein the temperature is raised to 850-920 DEG C, the temperature is kept for 5-10min, and then the temperatureis cooled to the normal temperature at a rate of 20-50 DEG C / min. The advantages are as follows: 1) solving the problem of Mg volatilization during alloy smelting; 2) greatly reducing the effect ofimpurities on the alloy; 3) making the internal crystal phase of the alloy more stable and increasing the number of cycles of the alloy; 4) improving the capacity of the alloy hydrogen storage material; expanding the applicable temperature of the alloy hydrogen storage material; reducing the hydrogen absorption and desorption pressure, and 5) making the alloy crystal phase more uniform.

The invention belongs to the technical field of solid material preparation, and particularly relates to a method for preparing a nickel-cerium solid solution material through ultrasonic assistance. The method comprises the steps that nickel salt, cerium salt, organic acid and an organic macromolecular structure guide agent sufficiently interact through the ultrasonic assistance in a solvent heat treatment manner; and under a self-assembly effect, a flower-shaped or spherical nickel-cerium solid solution with a uniform crystalline phase is formed. The nickel-cerium solid solution material prepared by the method is lower in nickel content, has the characteristics of high specific surface area, high nickel atom dispersity, small crystal particle size, uniform crystalline phase and the like, has excellent oxidoreduction performance and oxygen storage and release performance, has the oxygen storage quantity of 400-600 [mu]mol O/g, and has good application prospects in the fields of environment catalysis, solid fuel batteries, sensors and the like.

The invention discloses a preparation method of a blast furnace slag-based composite material, and belongs to the technical field of recycling of industrial waste residues. The method mainly comprises the following steps: (1) alkali fusion of blast furnace slag, (2) a reaction with phosphate, and (3) hydrothermal aging to prepare the blast furnace slag-based hydroxyapatite-zeolite composite material with high added value, and comprehensive utilization of useful components in the blast furnace slag is realized. The method disclosed by the invention has the characteristics of strong adaptability, simple process, convenience in operation, mild reaction conditions, high added value of products and the like; according to the method, the blast furnace slag is used as a cheap raw material, so that the environmental problem caused by massive stockpiling of the blast furnace slag can be effectively relieved, and the construction and operation cost of a storage yard of an enterprise can be reduced to a certain extent.

The invention relates to the technical field of glass production, and especially relates a glass, and a preparation method and application thereof. The glass provided by the invention comprises, by weight, 20-50% of CaO, 10-40% of MgO, 10-40% of SiO2, 1-30% of B2O3, 0-5% of ZrO2, 0-5% of Al2O3 and 0-5% of La2O3. According to the glass, the proportion of each component is adjusted, the ratio of a glass phase to a ceramic phase is adjusted, the thermal expansion coefficient of the glass is increased, the thermal expansion coefficient of the glass is measured to be 10.95-11.65 ppm/DEG C through experiments, and the thermal expansion coefficient is large, and is matched with the thermal expansion coefficient of a common material stainless steel of a connector of a solid oxide fuel cell, so therisk of battery leakage caused by mismatching of thermal expansion coefficients of the two can be reduced.