199results about How to "Prevent sintering" patented technology

The invention discloses a preparation method of an ammonia synthesis catalyst and a synthesis method of ammonia, the preparation method of the ammonia synthesis catalyst adopts SiC as a carrier and Ru as an active substance, the SiC is subjected to thermal shock through a Joule heating device, then a certain amount of Ru precursor solution is added into a certain amount of SiC, and after heating, stirring and drying, the ammonia synthesis catalyst is obtained. And carrying out thermal shock treatment on the dried product through a Joule heating device to obtain the Ru / SiC catalyst for ammonia synthesis, the method is simple in process and relatively low in cost, and the catalyst prepared by the method has relatively high catalytic efficiency and stability in the synthesis reaction of ammonia and has potential industrial application prospects.

The invention provides a method for preparing battery-grade lithium iron manganese phosphate from lithium iron phosphate lithium extraction slag and application of the battery-grade lithium iron manganese phosphate. The preparation method comprises the following steps: carrying out acid leaching on the ferrophosphorus slag to obtain a leaching solution and leaching slag; adding a manganese salt and an iron salt into the leachate to supplement manganese and iron, and then mixing with a precipitant solution and a complexing agent solution to carry out coprecipitation reaction to obtain a ferromanganese phosphate precursor; carrying out hydrothermal reaction on the ferromanganese phosphate precursor and a lithium source to obtain a lithium ferromanganese phosphate precursor; and sintering the lithium manganese iron phosphate precursor to obtain the battery grade lithium manganese iron phosphate, wherein acid adopted in the acid leaching process comprises phosphoric acid. According to the preparation method provided by the invention, the recovery rate of phosphorus and iron in the waste residues can reach 96% or above, the obtained lithium manganese iron phosphate material is high in purity, small in particle size and uniform in distribution, and the electrical property can reach the level of battery-grade lithium manganese iron phosphate; in addition, the preparation method is short in technological process, high in production efficiency and suitable for large-scale production.

The invention discloses a preparation method of a high-entropy metal oxide for preparing synthesis gas by carbonate pyrolysis carbon dioxide and methane dry reforming. The high-entropy composite metal oxide is obtained by nucleation of a mixed salt solution and an alkali source solution in a nucleation reactor, crystallization, washing, drying, grinding and high-temperature roasting. The high-entropy composite metal oxide prepared by the method is used for ultrahigh-temperature coupling reaction for preparing synthesis gas by taking carbonate pyrolysis industrial tail gas CO2 and CH4 as raw materials, the synthesis gas is efficiently prepared, and meanwhile, full utilization of waste heat in the carbonate pyrolysis process and resource conversion of CO2 are realized; the contribution is made for promoting the development of environment-friendly society and circular economy; the high-entropy composite metal oxide catalyst has excellent activity, selectivity and stability.

The embodiment of the invention provides a method for improving the self-opening rate of a ladle nozzle and a ladle baking structure, and relates to the field of steelmaking production. The method for improving the self-opening rate of the ladle nozzle comprises the steps that a nozzle material is controlled to be installed at the nozzle of the ladle; the steel ladle is controlled to turn over, so that the water gap faces upwards; and hot air in the steel ladle is controlled to bake the nozzle material. In the working process, after the nozzle material is installed, the steel ladle is turned over to enable the nozzle to face the upper side, hot air in the steel ladle moves towards the upper side, the nozzle material can be baked while the hot air is exhausted, moisture and tar in the nozzle material can be baked out, mixing of the moisture and the tar with stuffing sand is reduced, and the service life of the nozzle material is prolonged. The particles react to generate a liquid phase, a sintering layer is formed at the high temperature of molten steel, and the self-opening rate of the nozzle of the steel ladle is improved by preventing the stuffing sand at the nozzle material from being sintered.

The invention relates to a metal additive modified Pt-loaded CeO2 catalyst, preparation and application thereof in CO oxidation, and belongs to the technical field of industrial catalysis. The preparation process of the catalyst mainly comprises the following steps: respectively dissolving cerium salt, platinum salt and auxiliary metal salt in deionized water to prepare corresponding precursor solutions; then, mixing the three solutions, and dropwise adding ammonia water under a stirring condition until yellow precipitates are generated; and finally, drying and washing the precipitate, and calcining the solid powder in a proper atmosphere to obtain the assistant metal modified Pt / CeO2 catalyst. La, Pr, Nd or Sm auxiliary metal is introduced into the Pt / CeO2 catalyst, so that the CO catalytic oxidation performance of the catalyst can be improved, and the poisoning resistance of the catalyst in an SO2-containing environment can be enhanced. The method has important significance in the actual industrial application, especially in the catalytic oxidation process under the condition of treating complex flue gas.

The present invention discloses a mixed deoxidizer and its application in HDH, belonging to the technical field of inorganic deoxidizers. The components of the mixed deoxidizer are selected from at least three of borides, carbides, hydrides and titanium dichloride, and the deoxidation method is: the mixed deoxidizer and titanium hydride are mixed and kept at 400-850°C for 1-24h; the amount of the mixed deoxidizer does not exceed 0.1% of the mass of high-oxygen titanium hydride. The mixed deoxidizer of the present invention and its application method in HDH can solve the problems of high oxygen content of titanium hydride, powder agglomeration, poor mechanical properties of related molded products, etc., and improve the actual industrial application value of titanium hydride and its processed products.

The invention belongs to the technical field of energy conservation and environmental protection, and discloses a cement kiln system for coupling oxygen enrichment and staged combustion by using alternative fuel in a large proportion, which comprises a circulating fluidized bed system, a decomposing furnace, a rotary kiln and a grate cooler, the kiln tail of the rotary kiln is connected with the bottom of the decomposing furnace, a bottom gasified gas spraying pipe is arranged between a kiln tail smoke chamber of the cement kiln and a coal spraying pipe of the conical part, and an upper gasified gas spraying pipe is arranged on the upper portion of the middle section of the decomposing furnace; the bottom gasified gas spray pipe and the upper gasified gas spray pipe are both connected to a gasified gas outlet of the circulating fluidized bed system; and a semi-gasified gas spray pipe is arranged at the upper part of the lower section of the decomposing furnace and is connected to a semi-gasified gas outlet of the circulating fluidized bed system. The disposal amount of the alternative fuel can replace 50% of pulverized coal in the decomposing furnace, and the requirement for using the alternative fuel in a large proportion is met.

The invention provides an ordered platinum alloy catalyst, a preparation method and a fuel cell, and belongs to the field of fuel cells. Comprising an inner core, the inner core is a compound of PtMM * alloy and C, M is non-noble metal, and M * is low-melting-point metal; the shell covers at least part of the surface of the inner core, and the shell is a carbon layer. The low-melting-point metal element is added into the ordered platinum alloy catalyst firstly, so that the ordering transformation temperature can be reduced, finally, the ordered alloy can be obtained through heat treatment at the low temperature, and agglomeration and growth of alloy particles are avoided to the maximum extent. And secondly, carbon coating is formed on the outer layers of the PtMM * alloy particles, so that sintering, agglomeration and growth of the metal particles are effectively avoided in the heat treatment process. And finally, the carbon-supported platinum alloy catalyst is prepared by coupling the carbon-supported platinum alloy catalyst and the carbon-supported platinum alloy catalyst, and agglomeration and growth of Pt alloy can be avoided in the process of forming an ordered structure by the Pt alloy catalyst, so that a relatively small and uniform particle size is ensured.

The invention provides a dehydrogenation catalyst as well as a preparation method and application thereof. The catalyst has a microwave response core-shell structure and comprises a carrier and a catalytic active component, the carrier is of the core-shell structure, an inner core is a microwave absorption material, a shell is a catalytic carrier material and comprises one or more of La2O3, TiO2, Al2O3, SiO2, Fe2O3, MnO2, ZrO2, CeO2, K2O and MgO, and the microwave absorption capacity of the inner core material is larger than that of the shell material. The core-shell structure catalyst is designed to deploy microwave field distribution, heat is directly supplied to the interior of the catalyst, the internal temperature is controllable, cascade coupling of the catalyst and the microwave field can be achieved, sintering of catalytic active components is avoided, the catalyst keeps the high activity and stability of the catalyst, heat is supplied to the dehydrogenation reaction in time from the inside to the surface and from the inner core, and the dehydrogenation reaction efficiency is improved. The problem of internal cold and external heat in endothermic reaction can be solved, and dehydrogenation reaction is efficiently enhanced.

The invention discloses a method for regulating and controlling the particle size of platinum alloy in a catalyst by using a surfactant compound, relates to a preparation method of a platinum alloy catalyst, and aims to solve the technical problem that the alloy is easy to agglomerate in the high-temperature sintering process of the existing platinum-based alloy catalyst. The method comprises the following steps: stirring and reacting polyvinylpyrrolidone and a surfactant at the temperature of 25-40 DEG C to obtain a compound solution; and adding a carbon carrier, chloroplatinic acid and transition metal salt into the compound solution, stirring, evaporating the solvent to dryness, and calcining to obtain the platinum-based alloy catalyst with regulated and controlled platinum alloy particle size. The particle size of the platinum alloy in the catalyst is 2.5-4.5 nm, the mass activity of the catalyst is 0.14-0.33 mA / [mu] gPt, the preparation method is simple, the cost is low, and batch production can be realized. The invention can be used in the field of proton exchange membrane fuel cells.

The invention discloses a National VI automobile exhaust after-treatment system, belonging to the technical field of automobile exhaust treatment, comprising an exhaust pipe front section, an exhaust pipe rear section, a control system, and an exhaust gas temperature regulator, a DOC, a DPF, an SCR, an ASC ammonia slip catalyst and a pyrolyzer which are sequentially connected in series between the exhaust pipe front section and the exhaust pipe rear section; the control system is composed of a controller, a first temperature sensor installed at an SCR inlet end, a second temperature sensor installed at a DPF inlet end, a first pressure sensor installed at a DPF inlet end and a second pressure sensor installed at a DPF outlet end; the system can control the emission temperature and airspeed of all working conditions, implement high temperature protection for the catalyst of each device, and control the minimum filter layer of the DPF during continuous passive regeneration; the contact opportunity between the exhaust gas and the catalyst is increased, and the maximum efficiency maximization and the back pressure minimization can be achieved at the same time; the catalyst of the patent has a fast cold start, high conversion efficiency in each working condition, small exhaust resistance, stable performance, long service life and low cost.

The invention relates to a preparation method and application of a Ni-CeO2 catalyst. The method comprises the following steps: (1) dissolving nickel precursor salt, cerium oxide precursor salt and citric acid monohydrate in deionized water to prepare a mixed solution; (2) refluxing, stirring and aging the mixed solution in a water bath at 50-90 DEG C for 1-5 hours; (3) performing rotary evaporation on the aged sol to obtain gel; after drying, grinding into powder, and calcining at 300-500 DEG C to obtain a NiO-CeO2 precursor; (4) reducing the obtained NiO-CeO2 precursor, so as to obtain a Ni-CeO2 catalyst A; the prepared Ni-CeO2 catalyst is used for methanation reaction. The catalyst has excellent carbon dioxide conversion rate and methane selectivity at low temperature, and meanwhile, the catalyst has long-period stability and good carbon deposition resistance.

The invention discloses a preparation method of a CuAlO2-phase-based alumina-based conductive ceramic, and belongs to the technical field of preparation of nano conductive ceramics. The invention relates to a method for converting aluminum oxide ceramic into a novel electric heating element from an insulator by adding a semiconductor component CuAlO2 phase in the aluminum oxide ceramic and continuously distributing the CuAlO2 phase along an aluminum oxide crystal boundary through a process to form a conductive path, which comprises the following steps of: mixing CuO, SiO2, Al2O3 and the like according to a certain proportion, and carrying out ball milling; and the novel aluminum oxide electric heating body is formed after tabletting and sintering. According to the method, the sintering temperature of the aluminum oxide ceramic can be greatly reduced, and complicated processes and equipment are not needed, so that the novel aluminum oxide conductive heating ceramic is low in energy consumption, simple in process, low in equipment requirement and excellent in product performance, and the price of a novel heating body is expected to be greatly reduced.

The invention discloses a preparation method of ultra-small cerium oxide nanoparticles, which comprises the following steps: preparing a mixed solution from magnesium sulfate and cerium salt, adding organic solvents such as ethanol, precipitating cerium-containing magnesium sulfate heptahydrate, drying to obtain cerium-containing anhydrous magnesium sulfate, and calcining the dried substance below the decomposition temperature of magnesium sulfate to obtain cerium-containing anhydrous magnesium sulfate; and washing the mixture with water to obtain the high-dispersion cerium oxide nano-particles with the ultra-small particle size, wherein the high-dispersion cerium oxide nano-particles with the ultra-small particle size are obtained. According to the method, high-temperature sintering of the cerium oxide nano-particles can be avoided, the high-dispersion cerium oxide nano-particles with the particle size being only 3-4 nm are prepared, the process cost is low, and large-scale production is easy to achieve.

The invention belongs to the technical field of catalyst preparation, and provides a preparation method of a long-acting operation catalyst for methanol synthesis, and the preparation method comprises the following steps: adding graphene into deionized water, stirring, adjusting the pH value, adding a LaCl3. 6H2O solution, heating for reaction, adjusting the pH value, adding an anionic surfactant, continuously reacting, centrifugally washing, and drying to obtain the long-acting operation catalyst for methanol synthesis. Performing vacuum drying and grinding to obtain modified graphene; then adding a copper nitrate solution, a zinc nitrate solution and an aluminum nitrate solution into deionized water, heating, stirring and mixing, adding a precipitator, adjusting the pH value, carrying out a co-precipitation reaction, filtering, washing and drying to obtain a precipitation material; and finally, uniformly mixing the precipitation material with the modified graphene, roasting the mixture in a muffle furnace in an air atmosphere, and tabletting and grinding to obtain the catalyst. The obtained catalyst has high activity, high selectivity and good heat resistance, the preparation method is simple, and the cost is low.

The invention relates to the field of catalysts, in particular to a copper-based catalyst and a preparation method and application thereof.The preparation method comprises the following steps that S1, a first solution containing a zinc source and an aluminum source and an alkaline precipitator solution are subjected to first mixing to obtain turbid liquid; carrying out second mixing on the turbid liquid, a second solution containing a copper source and the alkaline precipitant solution to obtain a mixed material; s2, carrying out aging treatment on the mixed material to obtain aged slurry; s3, washing the aged slurry, and then carrying out drying treatment and roasting treatment; wherein the second solution also contains a coupling agent and a metal additive; the coupling agent comprises a titanate coupling agent; the metal additive contains a first metal element, and the first metal element is selected from at least one of an IIA group element, an IVB group element and a VIB group element. The copper-based catalyst provided by the invention can significantly improve the yield of methanol in a reaction for preparing methanol by hydrogenation of carbon dioxide.

The utility model belongs to the technical field of grinding machines, and particularly relates to a water grinding machine which comprises a mounting frame, an upper mounting plate arranged on the mounting frame, a mounting box fixed on the upper mounting plate, a bidirectional motor mounted on the mounting box, a ceramic grinding wheel mounted on the bidirectional motor, a lower mounting plate mounted on the mounting frame, a water tank mounted on the mounting plate and a water pump mounted on the lower mounting plate. The water tank communicates with a first water conveying pipe and is provided with a shunt valve, the water pump communicates with a second water conveying pipe, the mounting box is provided with a water valve, the shunt valve communicates with a shunt pipe, the water valve communicates with a cooling pipe, the cooling pipe is provided with a sprinkler head, and the upper mounting plate is provided with a backflow assembly. By starting the water pump, cooling water in the water tank flows through the first water conveying pipe, the second water conveying pipe, the water distributing pipe and the cooling pipe, so that the cooling water can be sprayed out of the water spraying head, the temperature in the grinding process is effectively reduced, sintering of the ceramic grinding wheel due to friction overheating is prevented, the service life of the ceramic grinding wheel is prolonged, and dust is reduced; and the working environment is optimized.

The invention provides a preparation method of micron-sized spherical silver-coated copper powder for the electronic industry, and belongs to the technical field of conductive materials.The preparation method comprises the steps that a copper sulfate solution and ethyl alcohol react to obtain a first solution; adding an ammonium oxalate solution into the first solution to obtain slurry; adding a silver nitrate solution and an ammonium oxalate solution into the slurry, and performing stirring, standing and vacuum drying to obtain an oxalate precursor precipitate; mixing the oxalate precursor precipitate with stearic acid, carrying out first vacuum mixing and kneading, adding fumed silica particles, and carrying out second vacuum mixing and kneading to obtain powder; and heating the powder to 135-145 DEG C in a vacuum state, preserving heat for 1.5-2.5 hours, continuously heating to 270-320 DEG C, preserving heat for 1.5-2.5 hours, cooling to room temperature along with a furnace, and carrying out acid pickling, suction filtration, washing, drying and sieving. The micron-sized spherical silver-coated copper powder is high in oxidation resistance, short in process period and high in yield.

The invention belongs to the technical field of catalysts, and particularly relates to a novel full-fraction waste mineral oil hydrogenation catalyst and a preparation method thereof. According to the invention, polyethylene glycol is adopted as a surfactant, and a catalyst carrier with a high specific surface area is prepared through a coprecipitation process. And on the basis of the Mo-Co catalyst, a certain amount of metal manganese and cerium are added. Dispersion of active components in the catalyst is promoted through the pre-deposited cerium oxide auxiliary agent, interaction between metal and the carrier is weakened, and increase of the specific surface area of the catalyst is promoted. The addition of manganese can enhance the interaction of the components of the catalyst, and especially the formation of manganese oxide can effectively promote the dispersion of active components and prevent excessive sintering of the catalyst, thereby effectively improving the activity of the catalyst. The catalyst has the advantages of high specific surface area and pore size, high catalytic activity, effective improvement of the desulfurization and denitrification rate of the waste mineral oil, and wide application prospect.

The invention discloses an indium-based catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. The indium-based catalyst comprises a molecular sieve carrier and an active metal component limited in a molecular sieve; wherein the molecular sieve carrier is an all-silicon MFI type molecular sieve carrier; wherein the active metal component comprises a main active metal component and a noble metal auxiliary agent; the main active metal component comprises In, and the precious metal auxiliary agent comprises any one or a combination of at least two of Fe, Co, Ni, Cu, Zn, Ru, Rh, Pd, Pt or Ir. The catalyst disclosed by the invention has relatively high carbon dioxide hydrogenation activity, the catalyst is not inactivated within 100 hours of reaction, and the reaction performance is maintained at a relatively high level. The prepared indium-based metal confinement catalyst has excellent performance in the reaction of preparing methanol through carbon dioxide hydrogenation, and has a good application prospect.

The invention relates to a preparation method of an intermetallic compound nano catalyst with one-dimensional morphology. The method comprises the following steps: adding a noble metal salt, a non-noble metal salt, a surfactant and a reducing agent into oleylamine to obtain a colloid, and then ultrasonically dispersing the colloid together with a carbon carrier in a mixed solution of cyclohexane and ethanol to obtain a nano catalyst precursor with a one-dimensional morphology and a disordered structure; and quickly heating the precursor, and performing high-temperature annealing in an atmosphere with strong adsorbability to metal atoms to obtain the final intermetallic compound nano-catalyst with one-dimensional morphology. The method does not need processes such as coating and coating removal, and has the advantages of simple method, easiness in batch production and the like.

The present invention provides a copper-based catalyst, a preparation method and an application thereof, and relates to the technical field of synthesizing indole. The copper-based catalyst is composed of a carrier, an active component and an auxiliary metal, wherein the active component accounts for 5% to 15% of the carrier mass, and the auxiliary metal accounts for 3% to 15% of the carrier mass; wherein the carrier is a silica carrier doped with zirconium silicate, and the doping amount of zirconium silicate is 0 to 20% of the silica carrier mass; the active component is copper; the auxiliary metal is a first auxiliary metal and a second auxiliary metal with a mass ratio of 2 to 10:1 to 5, the first auxiliary metal is one or more of zinc, magnesium, calcium, cobalt, and nickel, and the second auxiliary metal is one or more of yttrium, lanthanum, cerium, praseodymium, samarium, aluminum, gallium, indium, chromium, molybdenum, and tungsten. The copper-based catalyst provided in the embodiment of the present invention has excellent performance and has significant advantages in terms of sustained reaction life. When preparing indole, the copper-based catalyst can react continuously for 10 h with a yield of more than 60%, react for 200 h, and maintain a yield of more than 40%, and react for 500 h with a yield of more than 32%.

The application belongs to the technical field of carbonyl sulfur hydrolysis catalysts, and discloses a high-efficiency sulfur-resistant catalyst for carbonyl sulfur hydrolysis, a preparation method and application thereof.The preparation method comprises the following steps: (1) preparing a porous ceramic carrier containing alumina, titanium dioxide and zirconium dioxide; (2) in-situ growing a metal organic framework material containing lanthanum, bismuth and cerium on the surface of the porous ceramic carrier by using a solvothermal method; (3) performing a calcination treatment on the porous ceramic carrier loaded with the metal organic framework material in an oxygen-containing atmosphere to obtain a catalyst precursor; and (4) performing a reducing gas plasma bombardment treatment on the catalyst precursor to obtain the high-efficiency sulfur-resistant catalyst.The high-efficiency sulfur-resistant catalyst has high-efficiency low-temperature activity, excellent sulfur resistance and long service life.

The invention provides a uniform roasting method for a 500KA full-graphitization electrolytic cell, and relates to the technical field of electrolytic cell roasting. The roasting method comprises the steps that grooves between cathode carbon blocks are filled and leveled up with cryolite wrapped with a plastic film, a medium is laid on the surface of a cathode boss, a mixture of graphite scraps and coke powder with the mass ratio being 1: 6 is laid on corner poles, pure coke powder is laid on an intermediate pole, and the laying thickness is 20 mm; filling calcium fluoride, cryolite, sodium carbonate and electrolyte powder into a tank; electrifying and roasting. Through the method, the conductivity of the corner pole can be improved, the current distribution is uniform, the corner pole and the cathode lining are fully roasted, the stability of the electrolytic cell is enhanced, and the service life of the electrolytic cell is prolonged.

The invention relates to the technical field of carbon dioxide dealkylation, and discloses a catalyst for removing hydrocarbon impurities in carbon dioxide and a preparation method of the catalyst. According to the catalyst for removing hydrocarbon impurities from carbon dioxide, active components are loaded on composite carrier particles; the composite carrier particles are obtained by loading a catalytic promoter cerium oxide on composite aerogel, grinding and sieving; the composite aerogel is prepared from a coagulant aid and at least two aerogel precursors by a sol-gel method. The preparation method of the catalyst for removing hydrocarbon impurities in carbon dioxide comprises the following preparation steps: 1) preparing composite aerogel from an aerogel precursor and a coagulant aid through a sol-gel method; 2) soaking the composite aerogel in a cerium nitrate solution, naturally airing, drying, roasting, grinding and sieving to obtain composite carrier particles; and 3) dipping the composite carrier particles in a mixed solution of active components, standing, drying and roasting to obtain the catalyst for removing hydrocarbon impurities from carbon dioxide.

This invention relates to the field of marine propulsion technology, specifically to an auxiliary propulsion structure for electric ships. The structure includes a ship hull, a propeller mounted on the bottom of the hull, and rotating rods fixedly connected to both sides of the hull. An auxiliary propeller is mounted on each rotating rod. Through an idling cooling mechanism, when the water inlet is above the water surface, causing the drive rod to drive the auxiliary propeller to idle, the idling cooling mechanism opens an emergency water path. This allows pre-stored cooling water from the tank to be precisely delivered via drip pipes to the junction of the drive rod and the bearing. This directional dripping forms a water film at the friction interface, providing immediate lubrication and drag reduction, as well as rapid heat absorption and cooling, preventing high-temperature wear, deformation, or sintering of components. Compared to traditional unprotected designs, this mechanism is fast-responding and highly targeted, minimizing damage to core components during idling and ensuring reliable operation of the auxiliary propeller in complex waters.

A catalyst for coupling pyridine to prepare 2,2-bipyridine and a preparation method thereof, relates to the technical field of catalyst preparation. The catalyst takes nickel oxide as an active component, enhances the basicity of the catalyst surface by introducing an auxiliary element, loads the active component on alumina by a deposition precipitation method, and is prepared by kneading and extruding into a strip. The method is simple in preparation and low in cost. The obtained catalyst can make the conversion rate of pyridine reach 14.98% and above under low temperature reaction conditions of 110 DEG C, the selectivity of 2,2-bipyridine is as high as 80% and above, and the catalyst has good catalytic activity and application prospect.

The invention relates to a preparation method of multi-layer framework high-entropy ceramic nano aerogel, and belongs to the technical field of aerogel materials. The method comprises the following steps: adding metal oxide nanoparticles and inorganic acid into deionized water, and uniformly stirring and mixing at room temperature to obtain an acidic dispersion liquid; the method comprises the following steps: carrying out high-temperature and high-pressure hydrothermal reaction on an acidic dispersion liquid to prepare nanocrystal wet gel, pressing the nanocrystal wet gel into a wet gel thin layer with a certain thickness, flatly laying a fiber-reinforced grid fabric on the wet gel thin layer, repeating the step for several times to obtain multi-layer composite wet gel, and carrying out pressure maintaining on the multi-layer composite wet gel to obtain water-based multi-layer framework wet gel; and placing the water-based multi-layer framework wet gel in a low-surface-tension mixed solvent for solvent exchange to obtain low-surface-energy solvent-based multi-layer framework wet gel, and performing drying, high-temperature heat treatment and quenching on the low-surface-energy solvent-based multi-layer framework wet gel. The nano-skeleton of the high-entropy ceramic nanocrystal aerogel is thick and strong, and the problems of collapse, volume shrinkage and heat insulation failure of the nano-skeleton of the aerogel can be effectively avoided.

The utility model discloses a dry type granulator for preparing sodium ion particles, which comprises a granulator body, a sodium ion drying box communicated with the inside of the granulator body is fixedly mounted at the top of the granulator body, and a driving motor is fixedly mounted on the front side of the sodium ion drying box. And an output shaft of the driving motor penetrates through and extends into the sodium ion drying box, and a synchronous roller is fixedly connected to the output shaft of the driving motor. According to the utility model, the sodium ion drying box at the top of the granulating machine body is used for realizing segmented drying of sodium ion solution, so that the evaporation rate of moisture and the formation of powder can be better managed, and in the initial stage, the gaps are reserved, so that the moisture can be quickly evaporated, the retention time of the solution at high temperature is reduced, and overheating or sintering can be prevented; in the sealed drying stage, the temperature and the pressure can be controlled more accurately, more uniform and finer powder particles can be formed, the sodium ion powder can enter in an orderly and equivalent mode through the multiple sets of bent plates, and the granulation quality is improved.

The invention discloses a methane reforming catalyst capable of improving hydrothermal resistance as well as a preparation method and application of the methane reforming catalyst, and belongs to the technical field of catalyst preparation. According to the catalyst, a modified HAP-Ce composite carrier is prepared through coprecipitation, hydrothermal treatment and calcination, metal precursor salt serves as a modification component, Ni is impregnated and loaded, calcination is conducted, and then water vapor / nitrogen high-temperature hydrothermal treatment and hydrogen reduction are conducted to obtain the target catalyst. According to the catalyst, a heterogeneous metal oxide composite interface is constructed in situ, stable pinning of Ce species is achieved, and the Ni anchoring effect is enhanced, so that Ce migration and Ni sintering under the hydrothermal condition are inhibited, and high reaction activity, excellent carbon deposition resistance and good hydrothermal stability are shown; the preparation method has the advantages of controllable conditions and simple steps, and is easy for large-scale production and application.