101results about How to "Prevent sintering" patented technology

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 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 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 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 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 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.

This invention discloses a two-step hydrothermal method for preparing nickel-iron bimetallic MOF derivatives and its application. By controlling the precursor structure through a two-step hydrothermal strategy, the nickel-iron bimetallic MOF derivative catalyst forms a foam-like hierarchical porous carbon framework. The metal nanoparticles are uniformly dispersed, small in size, and encapsulated by carbon layers, significantly improving the specific surface area and accessibility of active sites. It exhibits excellent hydrogen yield and anti-carbon deposition performance in plastic pyrolysis tar reforming. The synergistic effect of nickel and iron electrons effectively inhibits metal sintering and carbon deposition, and has good catalytic stability. This invention solves the problem in existing nickel-iron bimetallic MOF derivatives where phase separation easily occurs in one-step synthesis due to the difference in nucleation and growth rates between nickel and iron ions and organic ligands, leading to uneven metal distribution, increased particle size, underdeveloped pore structure, and low accessibility of active sites, thus affecting catalytic reforming activity and anti-carbon deposition ability.

This invention discloses a method for preparing a metal phosphide catalyst. The method involves uniformly mixing a carbon-containing precursor with a phosphorus-containing precursor solution and then drying the mixture to obtain a solid product. The solid product is then pyrolyzed under an inert atmosphere. The pyrolyzed solid product is washed and dried to obtain a phosphorus-doped carbon material. A metal salt solution is then uniformly mixed with the obtained phosphorus-doped carbon material, dried, and reduced under a hydrogen-containing gas atmosphere to obtain the metal phosphide catalyst. Thus, this invention prepares phosphorus-doped porous carbon through the pyrolysis of a carbon precursor and a phosphorus-containing precursor. This utilizes the binding effect of phosphorus functional groups with metal ions to inhibit the migration and aggregation of metal particles under high-temperature conditions, effectively preventing metal particle sintering and improving the yield of the target catalytic product.

The utility model discloses a waste gas combustion temperature adjusting system, and belongs to the technical field of waste gas purification. A waste gas combustion temperature adjusting system comprises a control cabinet, a first temperature sensor, a second temperature sensor, a first oxygen adjusting valve, a second oxygen adjusting valve and a waste gas control valve. The first temperature sensor is mounted at the exhaust end of the first reactor; the second temperature sensor is mounted at the exhaust end of the second reactor; the first oxygen regulating valve is mounted at the gas inlet end of the first reactor; the second oxygen regulating valve is mounted at the gas inlet end of the second reactor; the control cabinet is electrically connected with the first temperature sensor and the second temperature sensor and used for detecting the exhaust gas temperature of the exhaust ends of the first reactor and the second reactor; the control cabinet is electrically connected with the first oxygen regulating valve and the second oxygen regulating valve and is used for controlling the rate of oxygen introduced into the first reactor and the second reactor.

The invention belongs to the technical field of catalysts, and particularly relates to a composite carrier dehydrogenation catalyst for preparing gamma-butyrolactone through dehydrogenation of 1, 4-butanediol as well as a preparation method and application of the composite carrier dehydrogenation catalyst. According to the composite carrier dehydrogenation catalyst disclosed by the invention, a Y-type molecular sieve / gamma-Al2O3 is used as a composite carrier, and an active component copper oxide is loaded on the composite carrier; wherein the mass ratio of the Y-type molecular sieve to the gamma-Al2O3 is (1-2): 1, the copper element content is 10%-20% according to the weight ratio of the composite carrier, and the zinc element content is 6%-10% according to the weight ratio of the composite carrier. By adopting a composite carrier structure, the dispersity and stability of active metals Cu and Zn are effectively enhanced. The composite carrier dehydrogenation catalyst prepared by the preparation method provided by the invention has the advantages of high catalytic activity, high selectivity and high stability.

The invention relates to a preparation method and application of a supported cobaltosic oxide catalyst, and the preparation method comprises the following steps: 1) dissolving a cobalt source and a carrier precursor in ethanol and water, adding 2-methylimidazole, stirring, standing, aging, and drying to obtain ZIF-67-based precipitate; and 2) carrying out primary roasting on the ZIF-67-based precipitate in a reducing atmosphere and carrying out secondary roasting in an oxidizing atmosphere in sequence to obtain the supported cobaltosic oxide catalyst, and applying the supported cobaltosic oxide catalyst to the reaction of catalyzing propane to generate carbon dioxide and water. Compared with the prior art, the method for preparing the supported cobaltosic oxide catalyst based on the ZIF-67 not only simplifies the preparation process and reduces the cost, but also remarkably improves the performance of the catalyst, and has important practical significance for improving the efficiency and economical efficiency of a VOCs catalytic oxidation technology; the preparation method provides a new and efficient solution for the development of a VOCs catalytic oxidation technology, and is expected to realize more environment-friendly and more economical VOCs treatment in industrial application.

The present invention belongs to the technical field of catalyst preparation, and provides an ordered mesoporous carbon-confined nickel phosphide catalyst, a preparation method thereof, and an application of catalytic cellulose to sorbitol. The phytic acid used in the present invention has a strong chelating effect, and each phytic acid molecule can complex six nickel ions, so the ratio of nickel to phosphorus in phytic nickel is relatively fixed. Due to the close complexation of nickel and phosphorus, a high phosphorus utilization rate can be achieved by controlling the volume space velocity of flowing air and flowing hydrogen, so that the generated hydrogenation active center is pure phase Ni2P. In addition, the catalyst precursor is first heat-treated in an atmosphere of flowing air, the purpose is to introduce oxygen, reduce the content of carbon species, and avoid excessive carbon species from burying the metal active center; then switch to an atmosphere of flowing hydrogen, continue to heat up for reduction treatment, the purpose is to reduce the phytic nickel to generate Ni2P active center, and then increase the content of pure phase Ni2P.

The application belongs to the technical field of ship exhaust purification, and particularly relates to a catalyst for decomposing N2O in the exhaust of a ship ammonia internal combustion engine and a preparation method thereof. 3+ By replacing Co ions in the Co3O4 spinel lattice into the lattice, the doping behavior can effectively reduce the number of hydroxyl groups on the surface of the catalyst, significantly weaken the adsorption and combination ability of water molecules, and thus improve the stability of the catalyst in a high-humidity exhaust environment. As an additive, CeO2 uses its oxygen storage capacity to promote the migration and desorption of oxygen species in the reaction, preventing the deactivation of active sites due to oxygen poisoning. The molecular sieve carrier not only provides a highly dispersed surface for the active component to prevent sintering, but also optimizes the adsorption and activation path of N2O and alleviates the poisoning effect of nitrogen-containing intermediate species or impurities in the exhaust on the Co active center during the reaction.

The invention discloses an ammonia-methanol coupling gas production device and a use method thereof, and belongs to the technical field of controllable atmosphere preparation, the ammonia-methanol coupling gas production device comprises a central combustion zone, a peripheral cracking zone and a tail mixing purification zone which are coaxially nested; the central combustion area comprises a hearth wall, and the hearth wall is of a honeycomb-shaped porous heat exchange structure; the peripheral cracking area is arranged on the outer side of the central combustion area, a catalyst bed layer of a spiral flow guide structure is arranged in the peripheral cracking area, and a high-temperature-resistant heat-conducting filling layer is arranged between the catalyst bed layer and the hearth wall of the central combustion area; the tail mixing and purifying area is connected to the downstream of the central combustion area and the peripheral cracking area and used for mixing and purifying combustion products from the central combustion area and cracking gas from the peripheral cracking area. By optimizing a heat exchange interface and a catalyst bed layer structure, the heat transfer uniformity and the response speed are enhanced, so that stable temperature control and preparation of high-purity mixed gas are realized.

The invention belongs to the field of metal-based composite materials, and relates to a micro-nano particle reinforced metal-based composite material and a preparation method thereof. Comprising the following steps: mixing micro-nano reinforced particles and salt particles in proportion, heating to melt the salt particles, and ultrasonically stirring to obtain molten salt-micro-nano turbid liquid; smelting a metal matrix to obtain a metal melt, adding the molten salt-micro-nano suspension into the metal melt, stirring to obtain a mixture melt, and preserving heat; stopping stirring, allowing the mixture melt to stand, allowing the micro-nano reinforced particles to enter the metal melt from the molten salt to form an alloy melt, and keeping the temperature until the molten salt and the alloy melt are layered; and casting the alloy melt and the molten salt together, cooling, and stripping the salt body to obtain the micro-nano particle reinforced metal matrix composite material. According to the preparation method, the metal-based composite material with uniformly dispersed micro-nano particles is obtained by optimizing the preparation process, meanwhile, the preparation difficulty and the preparation cost are reduced, and a solution with application potential is provided for industrial production of the metal-based composite material.

The invention discloses a copper-silicon catalyst for plasma treatment as well as a preparation method and application of the copper-silicon catalyst. According to the method, a copper-silicon catalyst precursor prepared by a traditional ammonia distillation method is subjected to dielectric barrier discharge plasma treatment in the atmosphere of H2 / Ar and the like, and traditional high-temperature roasting and reduction processes are replaced. According to the method, efficient reduction and high dispersion of copper can be achieved at the room temperature, the Cu < + > / Cu0 proportion is regulated and controlled, and the strong interaction between metal and a carrier is enhanced. The catalyst is used in a reaction for preparing ethylene glycol through hydrogenation of dimethyl oxalate, the activity, selectivity and stability of the catalyst are higher than those of a traditional heat treatment catalyst, the dimethyl oxalate conversion rate reaches up to 100%, the ethylene glycol selectivity is larger than 97%, and the stability reaches 1000 h or above. The method is simple in process, low in energy consumption and environment-friendly, and has a wide industrial application prospect.

The embodiment of the application provides a kind of propane ammoxidation preparation acrylonitrile, it is related to acrylonitrile generation technical field;The method comprises: propane, ammonia and oxygen are mixed, and mixed gas is obtained;The mixed gas occurs ammoxidation under the action of metal oxide composite catalyst, and acrylonitrile is obtained;The metal oxide composite catalyst includes Mo-V base metal oxide, and also includes alkali metal or alkaline earth metal.The method of the present application has relatively mild reaction conditions, the yield can basically reach more than 60%, the selectivity can reach more than 80%, improves the raw material utilization rate, reduces energy consumption and equipment investment, thereby effectively reducing the production cost of acrylonitrile.At the same time, the process of the present application can effectively control the side reaction in the reaction process, reduce the generation of by-products, and reduce the difficulty of subsequent separation and purification of reaction products.

The utility model provides a battery pack charging circuit and electric equipment. The battery pack charging circuit comprises a first anode charging terminal, a first cathode charging terminal, a charging capacitor and a first contactor. The first anode charging terminal is used for connecting a battery pack anode terminal to form a first anode circuit, and the first cathode charging terminal is used for connecting a battery pack cathode terminal to form a first cathode circuit; one end of the charging capacitor is electrically connected with the first positive electrode circuit, and the other end of the charging capacitor is electrically connected with the first negative electrode circuit; the first contactor is connected with the charging capacitor in series and located between the first positive electrode circuit and the first negative electrode circuit, so that large current can be prevented from flowing through the first contactor when the direct-current boost charging port is used for charging, the current flowing through the first contactor is greatly reduced, the size of the first contactor is reduced, the arrangement space on a whole vehicle is saved, and the service life of the whole vehicle is prolonged. And the occupied power distribution space of the whole vehicle is saved.