15 results about "Cobalt aluminate" patented technology

The invention provides an alkali metal loaded cobalt-based catalyst as well as a preparation method and application thereof, and relates to the technical field of preparation of a catalyst for preparing ethanol through hydrogenation of carbon dioxide. The active center of the catalyst is cobalt metal in a cobalt aluminate spinel structure, the catalyst contains Co0 and CoAl2O4 double catalytic active sites, and alkali metal is further introduced, so that the conversion rate of carbon dioxide and the selectivity of ethanol can be remarkably improved. In the carbon dioxide hydrogenation reaction, the conversion rate of carbon dioxide is high, and the selectivity of ethanol is high.

The invention relates to an alkali-etched Co0. 98Pd0. 02Al2O4-delta-alkali catalyst for catalytic oxidation of methane and a preparation method thereof, and belongs to the field of catalytic chemistry and environmental chemistry. The preparation method comprises the following steps: doping palladium into cobalt aluminate crystal lattices based on a one-step synthesis sol-gel method, carrying out high-temperature roasting treatment to obtain a Co < 0.98 > Pd < 0.02 > Al < 2 > O < 4-delta > catalyst, modifying the surface of the catalyst through NaOH, selectively dissolving a part of Al ions on the surface, and carrying out high-temperature roasting again to obtain an etching modified Co < 0.98 > Pd < 0.02 > Al < 2 > O < 4-delta >-alkali catalyst, the catalyst shows excellent low-temperature catalytic activity on methane combustion and has excellent thermal stability. The method has a good application prospect in the field of air pollution control.

The invention discloses an oxygen-vacancy-rich cobalt aluminate Fenton-like catalyst and a preparation method and application thereof, the oxygen-vacancy-rich cobalt aluminate Fenton-like catalyst is spinel type cobalt aluminum oxide, and the content of Co element in the spinel type cobalt aluminum oxide is 20-27 at.%, the content of Al element in the spinel type cobalt aluminum oxide is 10-15 at.%, and the content of O element in the spinel type cobalt aluminum oxide is 60-70 at. The oxygen vacancy-rich cobalt aluminate Fenton-like catalyst disclosed by the invention is used for activating PMS to generate sulfate free radicals and high-valence metals, 94.3% of carbamazepine can be degraded within 7 minutes, and the degradation rate within 10 minutes reaches 99.5%. In addition to carbamazepine, the cobalt aluminate Fenton-like catalyst rich in oxygen vacancy disclosed by the invention has a relatively good degradation rate on various pollutants such as o-nitrophenol, rhodamine B, ciprofloxacin, chloroquine phosphate, tetracycline and the like.

The invention belongs to the technical field of lithium-sulfur battery diaphragms, and discloses a preparation method of a cobalt aluminate modified diaphragm and application of the cobalt aluminate modified diaphragm in a lithium-sulfur battery, and the preparation method comprises the following steps: step 1, dissolving aluminum nitrate, cobalt nitrate, triammonium citrate and ethylene glycol in deionized water, uniformly mixing, and then carrying out oil bath heating to obtain gel; 2, the gel obtained in the step 1 is transferred to a muffle furnace to be heated, then cooled to the room temperature and taken out, and cobalt aluminate is obtained; step 3, uniformly mixing cobalt aluminate with conductive carbon black and a polyvinylidene fluoride adhesive, grinding, then adding N-methyl pyrrolidone to prepare slurry, and then smearing the slurry on a diaphragm to obtain a cobalt aluminate modified diaphragm; the material disclosed by the invention not only can effectively inhibit shuttling of lithium polysulfide, but also can promote rapid transmission of lithium ions, so that the cycle performance of the lithium-sulfur battery is finally improved.

The invention relates to the field of refractory materials, in particular to a La2O3-containing refractory material and a preparation method thereof. The problems that an existing refractory material is low in compression strength and breaking strength, poor in thermal shock resistance and high in apparent porosity are solved. The refractory material is prepared by taking calcium oxide, silicon dioxide, magnesium oxide, aluminum oxide, ferric oxide and lanthanum oxide as base materials and adding strontium cobalt aluminate to coat cerium magnesium aluminum chromium powder, and potassium chloride and sodium chloride are used as molten salts to prepare the cerium magnesium aluminum chromium powder through a dissolution-reprecipitation mechanism. Citric acid monohydrate, strontium acetate, cobalt nitrate hexahydrate and aluminum nitrate form a stable complex, strontium cobalt aluminate is obtained through high-temperature treatment, cerium-magnesium-aluminum-chromium powder is coated with the strontium cobalt aluminate through a first solution, the volume density, thermal shock resistance and mechanical strength of the refractory material are improved, and the strict requirements of high-temperature industry for the high-performance refractory material are met.

The invention discloses a ceramic core surface treatment method and a ceramic core prepared by the same. The method comprises the following steps: calcining and forming aluminum oxide to obtain a ceramic core blank; mixing cobalt oxide with water, adding silica sol, and stirring to prepare slurry; dipping a ceramic core blank in the cobalt oxide solution to obtain a ceramic core attached with cobalt oxide; and sequentially airing for 18-24 hours, drying for 1.5-2 hours at the temperature of 100-200 DEG C, finally putting into a sintering furnace, and sintering for 3-4 hours at the temperature of 1200-1250 DEG C to finally obtain the ceramic core attached with cobalt aluminate. According to the invention, through an innovative process of generating cobalt aluminate through high-temperature reaction of cobalt oxide and aluminum oxide, the problem of easy peeling in a traditional coating process is solved. And cobalt oxide is relatively low in cost, so that the production cost is greatly reduced, a more efficient and more economical ceramic core preparation technology is provided for the field of precision casting, and the production quality and efficiency of complex castings are favorably improved.

The invention provides a secondary battery and an electronic device, the secondary battery comprises a positive pole piece and an electrolyte, the positive pole piece comprises a positive pole current collector and a positive pole material layer arranged on at least one surface of the positive pole current collector, the positive pole material layer comprises nickel cobalt lithium aluminate, based on the mole number of metal elements except lithium in the positive pole material layer, the molar percentage content of the aluminum element is C1%, and C1 is more than or equal to 2 and less than or equal to 20; the electrolyte comprises a first component, and the first component is at least one of lithium difluorophosphate, lithium tris (pentafluoroethyl) trifluorophosphate or lithium trifluoroacetate; based on the mass of the electrolyte, the mass percentage content of the first component is m1%, and m1 is larger than or equal to 0.2 and smaller than or equal to 6. The secondary battery provided by the invention can give consideration to high-temperature cycle performance, high-temperature storage performance and dynamic performance.

The invention provides surface layer slurry, ultrasonic mixing equipment and an ultrasonic mixing method.The surface layer slurry is prepared from, by mass, 62%-80% of zircon powder, 15%-30% of silica sol, 1%-7% of cobalt aluminate, 0.1%-0.5% of a wetting agent, 0.1%-0.5% of a defoaming agent, 1%-3% of distilled water and 0.5%-1% of dysprosium oxide. The ultrasonic mixing equipment comprises a placement base which comprises a bottom plate and side plates, a slurry barrel is located on the bottom plate, and a cooling system is arranged in the slurry barrel; the two lifting devices are connected to the side faces, close to the bottom plate, of the side plates correspondingly, and the lifting devices on the two sides are connected through a lifting plate; the stirring power device is connected above the lifting plate; the turntable is positioned below the lifting plate and is connected with the stirring power device through a transmission shaft; an ultrasonic generator is arranged above the turntable, and a piezoelectric transducer is arranged below the turntable; and the amplitude-change pole is fixedly connected with the bottom of the piezoelectric transducer. The surface quality and the forming effect of the casting can be improved.

The invention belongs to the technical field of catalysts and relates to a cobalt aluminate spinel monolithic honeycomb catalyst as well as a preparation method and application thereof. The monolithic honeycomb catalyst is prepared from the following raw materials: fly ash, cobalt hydroxide and bamboo-based carbon; the monolithic honeycomb catalyst comprises a CoAl2O4 spinel crystal. According to the invention, the cheap and abundant fly ash is taken as a core raw material and reacts with the cobalt hydroxide and the bamboo-based carbon to form the integral honeycomb catalyst containing the cobalt aluminate spinel crystal, so that the catalyst has an excellent effect of catalytically converting volatile organic compounds, and high value-added utilization of solid wastes is realized.

The invention provides a secondary battery and an electronic device, the secondary battery comprises a positive pole piece and an electrolyte, the positive pole piece comprises a positive pole current collector and a positive pole material layer arranged on at least one surface of the positive pole current collector, the positive pole material layer comprises nickel cobalt lithium aluminate, based on the mole number of metal elements except lithium in the positive pole material layer, the molar percentage content of the aluminum element is C1%, and C1 is more than or equal to 2 and less than or equal to 20; the electrolyte comprises a first component, based on the mass of the electrolyte, the mass percentage content of the first component is m1%, and m1 is larger than or equal to 0.01 and smaller than or equal to 5. The secondary battery provided by the invention can give consideration to low-temperature discharge performance, low-temperature cycle stability and high-temperature storage performance.

This invention relates to a mullite fiber modified ceramic mold shell and its preparation method. The preparation method of the mullite fiber modified ceramic mold shell includes the following steps: (1) placing a wax mold in a surface slurry, coating it with slurry, and then sapping it with sand to obtain a surface mold shell; the raw materials of the surface slurry include silica sol, mullite fiber, cobalt aluminate, and zircon powder; (2) placing the surface mold shell obtained in step (1) in a back slurry, coating it with slurry, and then sapping it with sand to obtain a back mold shell; the raw materials of the back slurry include silica sol, mullite fiber, and zircon powder; (3) dewaxing the back mold shell obtained in step (2) and then calcining it to obtain the mullite fiber modified ceramic mold shell. The preparation method provided by this invention can improve the structural strength of the ceramic mold shell and maintain good air permeability and high temperature stability, while significantly reducing the amount of raw materials used and saving production costs.

The invention relates to halogen-doped lithium nickel cobalt aluminate and a preparation method and application thereof, and the method comprises the following steps: S1, carrying out first solid phase mixing on nickel hydroxide and an aluminum source to obtain a first solid material; s2, carrying out second solid phase mixing on the first solid material and a cobalt source, and carrying out first heat treatment on the obtained mixed material in a first oxygen-containing atmosphere to obtain a second solid material; s3, carrying out third solid phase mixing on the second solid material and a lithium source, and carrying out second heat treatment on the obtained mixed material in a second oxygen-containing atmosphere; the cobalt source and / or the aluminum source contains halogen. The method is simple in step and beneficial to industrial amplification implementation and batch production, and all elements in the prepared halogen-doped lithium nickel cobalt aluminate are mixed relatively uniformly; when the composite material is used as a positive electrode material of a lithium ion battery, the composite material has relatively high specific capacity and relatively good cycle performance.

The present invention discloses a method for manufacturing a turbine mold shell with refined grains for investment casting, comprising the steps of preparing a coating, the coating comprising a surface coating, a transition coating, and a back coating; applying the surface coating; applying the transition coating; applying the back coating; dewaxing the mold shell; and sealing the inner and outer edges of the pouring nozzle. This investment casting silica sol mold shell manufacturing process reinforces the granular filler bonded to the inner and outer edges of the pouring nozzle by adding an inner and outer slurry sealing process to the pouring nozzle, preventing the granular filler on the pouring nozzle from falling into the mold shell. The mold shell coating is divided into three different coatings, and the surface coating uses a finer-grained cobalt aluminate powder additive, thereby increasing the smoothness of the mold shell surface layer, making the surface layer more dense, resulting in a mold shell with refined grains on the inner surface, thereby making the cast turbine casting a fine-grained casting with a smoother surface and higher precision.

The invention relates to a preparation method of a nickel cobalt lithium aluminate material, which comprises the following steps: mixing a ternary precursor with a first lithium source, and carrying out first sintering to obtain a first lithiation product; and coating the first lithiation product, mixing the coated first lithiation product with a second lithium source, and carrying out second sintering to prepare the nickel cobalt lithium aluminate material. By applying the preparation method, the stability and long cycle performance of the nickel cobalt lithium aluminate material can be improved, and the preparation method also has the advantages of easiness in implementation and large-scale preparation, and has a good application prospect.

The invention belongs to the technical field of battery materials, and particularly relates to a coated modified nickel cobalt lithium aluminate positive electrode material as well as a preparation method and application thereof. The lithium nickel cobalt aluminate positive electrode material comprises an inner core and a coating layer coated on the inner core, a is greater than or equal to 1.01 and less than or equal to 1.05, x is greater than or equal to 0.75 and less than or equal to 0.90, y is greater than or equal to 0.05 and less than or equal to 0.20, z is greater than or equal to 0.01 and less than or equal to 0.05, and p is greater than or equal to 0 and less than or equal to 0.05; l comprises one of Mg, Zr, Mo, Ti and Zn; and the tap density of the coated and modified nickel cobalt lithium aluminate positive electrode material is 2.7-3.2 g / cm < 3 >. The coated modified nickel cobalt lithium aluminate positive electrode material provided by the invention has relatively good electronic conductivity and rate capability, and can inhibit lattice collapse caused by phase change under high voltage, reduce intergranular gaps, enhance thermal stability of the material, inhibit capacity fading caused by structure looseness in charge and discharge processes, and prolong the cycle life of a battery.