319 results about "Carbocatalysis" patented technology

The invention discloses a preparation method of a platinum-carbon catalyst and the platinum-carbon catalyst, and the method comprises the following steps: pretreating a carbon carrier to obtain a target carbon carrier; carrying out platinum loading on the target carbon carrier by adopting a platinum precursor to obtain an initial platinum-carbon catalyst; dipping the initial platinum-carbon catalyst in the amino compound solution to obtain a dipping mixture; the concentration of the amino compound solution is 0.1-10 mmol / L; carrying out ultrasonic treatment on the impregnated mixture for 20-30 minutes at room temperature to obtain an intermediate platinum-carbon catalyst; and carrying out vacuum drying on the intermediate platinum-carbon catalyst at 60-80 DEG C for 8-16 hours to obtain the platinum-carbon catalyst. The amino compound solution is used for modifying the catalyst, the interaction between platinum particles and an oxygen-containing intermediate in the oxygen reduction process is weakened, and the catalytic activity of the platinum-carbon catalyst is improved.

The invention relates to the technical field of ORR catalyst preparation, in particular to an iron-nitrogen-carbon catalyst and a preparation method and application thereof. The invention provides a preparation method of an iron-nitrogen-carbon catalyst, which is characterized by comprising the following steps: dispersing zinc salt and ferrite in methanol to obtain a mixed solution A; the preparation method comprises the following steps: dispersing 2-methylimidazole and 1, 4-terephthalonitrile in methanol under a heating condition to obtain a mixed solution B; stirring and mixing the mixed solution A and the mixed solution B to obtain precursor powder, and calcining the precursor powder in an inert atmosphere to obtain the iron-nitrogen-carbon catalyst with the hierarchical porous structure. The invention provides a novel preparation method for preparing the iron-nitrogen-carbon catalyst with the hierarchical pore structure, and the iron-nitrogen-carbon catalyst with the hierarchical pore structure is prepared by introducing a 1, 4-terephthalonitrile molecular template.

The invention discloses a molasses-based biomass sulfonated carbon catalyst preparation method, which comprises: grinding and mixing solid molasses and sodium hydroxide, calcining at 500-650 DEG C in an inert atmosphere to obtain activated carbon, and carrying out a sulfonation reaction on the activated carbon and concentrated sulfuric acid to obtain the catalyst. According to the method, by-product molasses in the sugar industry is taken as a raw material, a carbon source is rich in source, low in price and easy to obtain, the process is simple, the catalyst has relatively high specific surface area and conversion rate, the by-product can be utilized in a high-valued manner, and the method has certain industrial practical value.

The invention discloses a FeAl diatomic catalyst with axial chlorine modification as well as a preparation method and application thereof, and relates to an atomic-scale dispersion catalyst as well as a preparation method and application thereof. The FeAl diatomic catalyst with axial chlorine modification provided by the invention takes nitrogen-doped carbon as a main body, and FeAlClN6 active sites are distributed in the main body; the structure of the FeAlClN6 is as follows: Fe and Al are coordinated with four N atoms, wherein two N atoms are bridge type N atoms coordinated with Fe and Al at the same time; eight atoms of FeAlN6 are in the same plane, and Al is coordinated with Cl in the vertical direction. The preparation method comprises the following steps: dispersing the carbon matrix, the iron source, the aluminum source and the nitrogen source in a solvent, stirring, drying by distillation, and carrying out heat treatment on a solid in an inert atmosphere to obtain the catalyst. The highest power density of a fuel cell assembled by the catalyst reaches 1339mW / cm < 2 >, the half-wave potential retention rate is 98% after 30,000 cycles of cyclic aging, and the catalyst can be applied to the electro-catalysis fields such as pollutant degradation, chemical nitrogen fixation and carbon sequestration, catalytic energy conversion and the like.

The invention relates to the technical field of chemical engineering, and particularly discloses a palladium-carbon catalytic hydrogenation reaction material treatment system, which comprises a three-dimensional workshop structure, an air-operated hoist, an air supply system, an air supply system and an air supply system, wherein the top of the three-dimensional workshop structure is provided with an elevator and a hoisting ton bag; the palladium-carbon circulating unit comprises a palladium-carbon preparation kettle, a hydrogenation reaction kettle, a decarbonization filter, a filter pressing cylinder, a sample splitter and a glove box which are connected in sequence, and the sample splitter is connected back to the palladium-carbon preparation kettle through a closed pipeline; the solid feeding unit comprises a ton bag feeder, a pneumatic valve and a spiral conveying pipe, and the tail end of the solid feeding unit is connected with a top feeding hole of the hydrogenation reaction kettle; the gas supply system comprises a hydrogen cylinder group and is connected to a gas distributor at the bottom of the hydrogenation reaction kettle through a pressure reducing valve and a flow regulating valve; through the multi-stage separation design and the safety interlocking mechanism of the palladium-carbon circulating unit, the recovery rate of the catalyst is increased, meanwhile, the pressure, temperature and stirring state are monitored in real time to trigger nitrogen purging or pressure relief, and the risks of hydrogen leakage and reaction out-of-control are reduced in combination with inert gas protection of the glove box.

The present invention relates to the technical field of ORR catalyst preparation, and in particular to an iron-nitrogen-carbon catalyst and its preparation method and application. The present invention provides a method for preparing an iron-nitrogen-carbon catalyst, characterized in that it comprises: dispersing a zinc salt and a ferrous salt in methanol to obtain a mixed solution A; under heating conditions, dispersing 2-methylimidazole and 1,4-terephthalonitrile in methanol to obtain a mixed solution B; stirring and mixing the mixed solution A and the mixed solution B to obtain a precursor powder, and calcining the precursor powder under an inert atmosphere to obtain an iron-nitrogen-carbon catalyst with a hierarchical porous structure. The present invention provides a new preparation method for preparing an iron-nitrogen-carbon catalyst with a hierarchical pore structure, which prepares the iron-nitrogen-carbon catalyst with a hierarchical pore structure by introducing a 1,4-terephthalonitrile molecular template.

The invention discloses a preparation method of a tellurium-doped metal-nitrogen carbon catalyst and application of the tellurium-doped metal-nitrogen carbon catalyst in a zinc-air battery, a metal organic framework precursor is synthesized by utilizing a nitrogen-containing heterocyclic ring ligand and transition metal, and the metal organic framework precursor is mixed with tellurium dioxide and then subjected to high-temperature calcination in an inert atmosphere to obtain the tellurium uniformly dispersed and doped metal-nitrogen carbon catalyst. The prepared tellurium-doped metal-nitrogen carbon catalyst fully utilizes the characteristics of moderate tellurium coordination capability and rich p electrons, further exerts the advantages of a metal-nitrogen carbon monatomic catalyst, avoids the use of a noble metal catalyst which is scarce in resource and relatively high in cost, and is suitable for industrial production. Wide application prospects are realized in the fields of electro-catalytic oxygen reduction, zinc-air batteries and the like.

The invention provides a platinum-carbon catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. The platinum-carbon catalyst is prepared from the following raw materials: a carbon carrier, a platinum precursor and ethylene glycol, wherein the ethylene glycol is simultaneously used as a solvent and a reducing agent. The preparation method comprises the following steps: carrying out heat treatment on the carbon carrier; taking a platinum precursor, ethylene glycol and the carbon carrier subjected to heat treatment, mixing, stirring and performing ultrasonic treatment to obtain a mixed material; adjusting the pH value of the mixed material, and then raising the temperature for reaction; and filtering, washing and drying the reactant in sequence to obtain the product catalyst. A reducing agent and a protective agent do not need to be additionally added in the preparation process, so that the production cost is reduced; meanwhile, the technological process is optimized, operation is easy, waste and loss caused by slurry transfer are avoided, and the product catalyst is good in particle uniformity, uniform in dispersion, excellent in performance and capable of being applied to preparation and assembly of fuel cell products.

The embodiment of the invention relates to the technical field of flow batteries, and provides a carbon felt electrode for a flow battery and a preparation method thereof, and the preparation method comprises the following steps: preparing a mixed salt solution containing first metal ions and second metal ions; preparing an alcohol solution containing 2-methylimidazole; adding the mixed salt solution into the alcohol solution, and uniformly mixing to obtain a precursor solution; immersing the cleaned carbon felt into the precursor solution for a first time, then taking out the carbon felt, cleaning the carbon felt with an alcohol solvent, and drying the carbon felt to obtain a ZIF carbon felt; and putting the ZIF carbon felt into a tube furnace protected by inert gas, and carrying out heat treatment at a preset temperature for a preset second time to obtain the carbon felt electrode. The invention provides a novel bimetallic catalyst, and the interaction between metals can promote the adsorption and activation of reactants on metal atoms and promote the proceeding of the reaction. In the nitrogen-carbon catalyst formed by carbonizing ZIF, metal ions are uniformly dispersed, and agglomeration of the metal ions in the synthesis process is prevented.

The invention relates to the field of carbon-based catalyst preparation, and discloses a preparation method of a carbon oxide catalyst, the prepared catalyst and a method for electrochemically preparing hydrogen peroxide, the method comprises the following steps: (1) mixing a carbon black material with a peroxide solution, and carrying out ultrasonic dispersion to obtain a mixed solution; (2) heating the mixed solution in the step (1) in a protective atmosphere, separating an obtained solid product, and drying to obtain a carbon oxide catalyst; wherein the mass concentration of the peroxide solution is 0.1 to 5 weight percent; the heating conditions comprise that the heating temperature is 60-100 DEG C; the heating time is 1-6 hours. According to the method, the carbon black material is treated by peroxide to obtain the carbon oxide catalyst, the hydrogen peroxide selectivity and reaction activity of the catalyst can be improved, and the preparation method is simple to operate.

The invention belongs to the technical field of new energy materials, and particularly relates to a preparation method of a biomass-based iron-nitrogen-doped carbon catalyst with a full pH range and application of the biomass-based iron-nitrogen-doped carbon catalyst in the field of zinc-air batteries. According to the preparation method, bacterial cellulose, zinc nitrate, ferric chloride and dimethylimidazole are taken as precursors, a clean, efficient and stable soft template method is selected, and Zn < 2 + > gasification and evaporation etching in a pyrolysis process are utilized, so that the derived carbon catalyst generates a large number of defects and a large number of micropores and mesopores, and overgrowth of iron nanoparticles is limited; and the oxygen reduction catalyst with high specific surface area and high catalytic activity and stability in a whole pH range is prepared through drying and high-temperature carbonization process optimization, so that an electrode active material with excellent electrochemical performance is provided.

The invention relates to the technical field of halogen-free flame-retardant antistatic high polymer materials, and discloses a halogen-free flame-retardant antistatic high-temperature-resistant nylon composite material and a preparation method of the halogen-free flame-retardant antistatic high-temperature-resistant nylon composite material. Comprising 50-68.4 parts of high-temperature-resistant nylon resin, 20-40 parts of reinforced fibers, 5-10 parts of a flame retardant, 0.5-1 part of a carbon forming catalyst, 1-3 parts of a synergist and 0.1-1 part of an antioxidant. The reinforcing fiber is a mixture of carbon fiber and glass fiber. The formula composition and the preparation process of the composite material are integrally optimized, so that the halogen-free flame-retardant antistatic high-temperature-resistant nylon composite material has good antistatic performance, and the fire safety and flame retardance of the composite material are greatly improved through a compact carbon layer.

The invention belongs to the technical field of catalysts, and provides an oxygen-doped carbon nitride catalyst and a preparation method and application thereof.The preparation method comprises the steps that melamine, a hydrogen peroxide aqueous solution and acetonitrile are mixed and subjected to a hydrothermal reaction, and a precursor material is obtained; and calcining the precursor material to obtain the oxygen-doped carbon nitride catalyst. The method has the following advantages: (1) the synthesis process of the catalyst is simple, the raw materials for synthesizing the catalyst are cheap and easily available, the equipment requirement for synthesizing the catalyst is simple and convenient, and the operation is easy; and (2) the catalyst has excellent reaction catalytic performance for selective oxidation of sulfides, has good substrate adaptability, is easy to recycle and reuse, and still has high yield after being used for many times. And (3) the adaptability of photocatalytic heterogeneous oxidation to substrate expansion in drug molecules is rarely reported at present, and the invention provides an application method of a metal-free photocatalyst for efficiently and selectively oxidizing sulfide under the condition of no additional additive.

The invention discloses a high-performance thermosetting resin plugging material, a preparation method and a water-based drilling fluid, and relates to the technical field of oilfield chemistry, and the preparation method of the plugging material comprises the following steps: stirring an aromatic compound containing two double bonds with sodium tungstate, a transfer catalyst and a hydrogen peroxide solution at room temperature for reaction, and purifying to obtain an epoxy compound; the preparation method comprises the following steps: heating an aromatic compound containing an aldehyde group, ammonium formate and a palladium-carbon catalyst with nitrogen to react to obtain an amine compound, transferring the epoxy compound and the amine compound into a size-adjustable mold, carrying out heating curing treatment, carrying out low-temperature ball milling on a crude product to obtain plugging material particles, and preparing the water-based drilling fluid by using the plugging material particles. The specific aromatic rigid framework monomer is selected, and the molar ratio of epoxy to the curing agent is accurately controlled, so that the mechanical strength and thermal stability of the material are remarkably optimized, and the plugging material has a good treatment effect on cracks and pores in complex stratums.

The invention relates to the technical field of carbon materials, in particular to a nanocarbon catalyst for a carbon nanotube, a preparation method and a preparation method of the carbon nanotube, and the preparation method comprises the following steps: providing a carbon source, a heteroatom source, a metal salt with a catalytic active component and an inert material lining; dissolving a carbon source, a heteroatom source and a metal salt in a solvent to form a reaction solution; the reaction liquid is transferred into an inert material lining, a heating reaction is conducted for a period of time, a product is collected after cooling is conducted, the nano metal / carbon catalyst powder is obtained, the nano metal / carbon catalyst powder is of a C-X-Me structure, C represents a carbon element, X represents a heteroatom element, Me represents a metal element, and the C-X-Me structure is formed by chelating C-X sites and metal nanoparticles. The catalyst activity can be remarkably improved, and the high-temperature aggregation and sintering phenomena of the catalyst can be inhibited.

The invention discloses a preparation method of a platinum-carbon catalyst, which comprises the following steps: adding a metal oxide and a hydrophilic surfactant into deionized water to form a mixed pre-reaction solution; adding carbon powder subjected to hydrophilic treatment, uniformly dispersing to obtain a carbon dispersion liquid, adding an alcoholic solution into the carbon dispersion liquid, stirring, and carrying out hydrothermal or solvothermal reaction; a platinum precursor, a reducing agent and salt or organic matter providing an alkaline environment are added into deionized water to form a platinum precursor solution, a reducing agent solution and an alkaline precursor solution; adding into the treated carbon dispersion liquid; and carrying out acid treatment and water washing to obtain the platinum-carbon catalyst. According to the invention, a surfactant and an oxide are used for adjusting the distance between carbon-loaded platinum nano-metal particles, and a Pt / C precursor with high-loading platinum nano-particles dispersed on carbon carriers with different specific surface areas can be obtained, so that the growth of platinum particles is prevented in a hydrothermal or solvothermal process, and the particle size is controlled.

The invention relates to the technical field of composite materials, in particular to a graphite carbon nitride catalytic membrane material and a preparation method and application thereof. The preparation method comprises the following steps: mixing melamine, a halogen source and water, drying, and carrying out heat treatment to obtain the halogen intercalation carbon nitride composite material; mixing the halogen intercalation carbon nitride composite material dispersion liquid with a metal salt solution, then adjusting the pH value to be alkaline, carrying out an in-situ coprecipitation reaction to obtain a metal oxide / halogen intercalation carbon nitride heterojunction, and carrying out vacuum calcination on the metal oxide / halogen intercalation carbon nitride heterojunction to obtain metal oxide / halogen intercalation carbon nitride heterojunction composite powder; mixing the metal oxide / halogen intercalation carbon nitride heterojunction composite powder, a polymer carrier and N, N-dimethylformamide to obtain a spinning solution, and performing electrostatic spinning to obtain a nascent fiber membrane; and calcining the nascent fiber membrane to obtain the graphite carbon nitride catalytic membrane material. The preparation method is high in operability, and the prepared material has the characteristics of stable structure and high catalytic efficiency.

The invention discloses a method for preparing 4-propyl syringol by catalyzing hydrogenolysis of lignin through cobalt-nitrogen co-doped porous carbon. According to the method, organic soluble lignin is taken as a raw material, lignin-based cobalt-nitrogen co-doped porous carbon is taken as a catalyst, small molecular alcohol is taken as a reaction medium, stirring reaction is performed under the hydrogen pressure of 1-2MPa and at the temperature of 190-260 DEG C, and the organic soluble lignin is selectively hydrogenolyzed into a monophenol chemical mainly containing 4-propyl syringol; the catalyst disclosed by the invention does not need to be subjected to carrier preparation, impregnation and reduction, and also does not need to be subjected to mofs material preparation and roasting, so that the catalyst has obvious advantages in a catalyst preparation process; according to the catalyst, transition metal is used as catalytic active metal, and the metal is uniformly dispersed on the surface of the catalyst in a monatomic-level dispersion degree to form a complex with CoN4 as a main component with carbon and nitrogen; the catalyst is wide in raw material source, low in metal content and obvious in cost advantage, and has the advantage of large-scale production.

The invention discloses a ruthenium-doped cobalt metal oxide nanosheet electrocatalyst and a preparation method and application thereof, and relates to the technical field of electrocatalysts.The preparation method comprises the steps that cobalt salt and trimesic acid are weighed and jointly dissolved in a methanol solution, and a mixed solution A is obtained after primary ultrasonic mixing treatment; dropwise adding a methanol solution containing ruthenium salt into the mixed solution A, carrying out secondary ultrasonic mixing treatment to obtain a mixed solution B, and carrying out hydrothermal reaction on the mixed solution B to obtain a ruthenium-cobalt metal organic framework precursor; and calcining the ruthenium-cobalt metal organic framework precursor. Compared with the prior art, the ruthenium-doped cobalt metal oxide nanosheet electrocatalyst prepared by the method shows excellent hydrogen evolution electrocatalytic activity and stability in an alkaline water electrolysis reaction, the performance of the catalyst is superior to that of a commercial platinum-carbon catalyst, and stable potential output can be kept in a 100-hour continuous test without obvious attenuation.

The invention discloses a method for preparing a fuel cell platinum-carbon catalyst, and relates to the technical field of fuel cells, and the method comprises the following steps: (1) mixing: fully mixing an alkali solution, a chloroplatinic acid solution and carbon carrier slurry according to a mass ratio, and uniformly dispersing to obtain platinum-carbon precursor slurry; (2) reaction: transferring the platinum-carbon precursor slurry into a reaction device, and carrying out first-step reaction; (3) secondary reaction: heating the cooled solution to 110-130 DEG C, carrying out secondary reaction for 10-30 minutes, ending the reaction, stopping heating, and cooling the reaction solution to 50-70 DEG C; and (4) adjusting the pH of the system. (5) cleaning and filtering: cleaning and filtering for 5-10 times by using ultrapure water to obtain a wet catalyst; and (6) drying: transferring the wet platinum-carbon catalyst into a vacuum drying box at 70-90 DEG C, and carrying out vacuum drying for 8-12 hours.

The invention relates to the field of adsorption materials, in particular to a discrete carbon-based biological base material for targeted treatment of high-concentration organic wastewater and a preparation process thereof.The discrete carbon-based biological base material is prepared from, by weight, 65-70 parts of activated carbon fibers, 8-10 parts of PLA fibers, 5-7 parts of sodium lignin sulfonate, 5-8 parts of ferroferric oxide magnetic particles and 8-10 parts of a carbon nitride catalyst; biPO4 is doped in the carbon nitride catalyst. According to the discrete carbon-based biological base material, the activated carbon fibers rapidly adsorb organic matters in high-concentration wastewater, the PLA releases a carbon source and accelerates formation of a biological membrane, and the biological membrane is degraded by taking the adsorbed organic matters as a substrate; the carbon nitride catalyst generates active oxygen under visible light to oxidize small molecular acid, and ferroferric oxide magnetic particles catalyze the reaction to break refractory toxins (such as antibiotics); after the reaction, the magnetic field recovers the material, sodium lignin sulfonate protects ferroferric oxide magnetic particles from corrosion, and regeneration performance is provided.

The invention discloses an algae-based iron-carbon catalyst as well as a preparation method and application thereof, and relates to the technical field of new material research and development and sewage treatment. The preparation method comprises the following steps: mixing ferrocene, diatomite and a solvent to obtain a mixed solution; adding a hydrogen peroxide solution into the mixed solution, and then heating for reaction to obtain an intermediate; and roasting the intermediate to obtain the algae-based iron-carbon catalyst. According to the invention, ferrocene and diatomite are used as raw materials, and the high-performance algae-based iron-carbon catalyst is prepared through simple solvothermal reaction and roasting treatment. The obtained algae-based iron-carbon catalyst is stable in structure, high in activity and wide in applicable pH range in a persulfate oxidation system, and can be used for activating persulfate to degrade antibiotic pollutants in water.

The invention relates to the technical field of photocatalytic materials, in particular to a metal single atom loaded defect carbon nitride catalyst and a preparation method and application thereof. The method comprises the following steps: by taking melamine as a nitrogen source, soluble metal salt as a metal source and ethylenediaminetetraacetic acid as a chelating agent, carrying out freeze drying in a solvent system, calcining in a protective atmosphere, and carrying out thermal polymerization, so as to obtain the metal single atom loaded defective carbon nitride catalyst. The metal in the soluble metal salt is copper, iron or manganese. Precise anchoring and high dispersion of metal ions are achieved through complexing of ethylenediamine tetraacetic acid, a stable metal-N coordination structure is formed, metal agglomeration is avoided, a defect structure is constructed synchronously, and the metal monatomic loading capacity is 1 wt.%-7 wt.%. The catalyst can efficiently catalyze and activate peroxymonosulfate and rapidly degrade antibiotic pollutants such as tetracycline, has the advantages of being low in preparation cost, environmentally friendly, high in catalytic activity and high in stability, and is suitable for the field of water pollution remediation.

The invention discloses a preparation method and application of an MOF (Metal Organic Framework) derived carbon catalyst for regulating and controlling oxygen reduction catalytic performance based on surface strain. The method comprises the following steps: firstly, constructing a cubic MOF core under the assistance of a cationic surface active agent template through coordination self-assembly of a cobalt ion node and an imidazole ligand; then, an MOF heterogeneous core-shell layer is constructed on the surface of the core through a zinc ion mediated epitaxial growth technology, and a double-layer cubic MOF precursor with a clear core-shell interface is formed. Through carbonization treatment at different temperatures, the core MOF generates controllable surface strain in the carbonization process, metal active site coordination and electronic structures can be adjusted, and the adsorption strength of sites to oxygen reduction intermediates is optimized. A rigid porous carbon frame formed after carbonization of an epitaxial MOF heterogeneous core-shell layer constructs a three-dimensional through mass transfer network through micro-mesoporous synergy, meanwhile, the rigid porous carbon frame and the strained core form a nanoscale space isolation area, and thermal migration of metal active sites and Ostwald curing are effectively inhibited by means of the geometric confinement effect. The activity and the stability of the catalyst are remarkably improved based on multiple synergistic effects caused by evolution of an intrinsic micro-nano structure induced by surface strain. The MOF derived carbon catalyst for regulating and controlling the oxygen reduction catalytic performance based on the surface strain, provided by the invention, is simple in preparation process and low in cost, and shows excellent performance and wide application prospect in a zinc-air battery.

The invention relates to a method for preparing hydrogen peroxide by electrocatalytic oxygen reduction and preparing carboxylic acid by coupling ketone oxidation, belongs to the technical field of electrocatalysis, and solves the problems of relatively high energy consumption and / or relatively low economic value of an anode product in the existing method for preparing hydrogen peroxide by electrocatalytic oxygen reduction. The method comprises the following steps: taking a carbon catalyst electrode as a cathode, wherein catholyte comprises a sodium sulfate solution; a NiCo2O4 electrode is used as an anode, and an anolyte is a solution containing potassium hydroxide and ketone; the catholyte and the anolyte are separated by a proton exchange membrane; the cathode is subjected to an electrocatalytic oxygen reduction reaction to generate hydrogen peroxide, and the anode is subjected to an electrocatalytic ketone oxidation reaction to generate carboxylic acid. The COR reaction is used for replacing the oxygen evolution reaction (OER) of the anode in the prior art, so that energy consumption is reduced, the anode converts ketone into carboxylic acid with high added value, and the economic value of the anode product is improved.

The present invention discloses a preparation method of a platinum-carbon catalyst, a platinum-carbon catalyst, and a catalyst coating film, comprising the following steps: step 1, adding a dispersing aid solution to a polyol solution of a platinum precursor, causing a coordination reaction, and obtaining a first material; step 2, adding a carbon carrier polyol slurry to the first material obtained in step 1, mixing, and obtaining a second material; step 3, heating the second material obtained in step 2 to 125° C. to 160° C., reacting for 1 h to 5 h, performing a reduction reaction, and cooling; then adding deionized water, continuing to stir for 1 h to 5 h, and obtaining a third material; step 4, concentrating the third material obtained in step 3, and then performing a dry grinding process to obtain a platinum-carbon catalyst. The method of the present invention avoids the introduction of other harmful impurities, does not require washing, has simple steps, and has low process costs; platinum nanoparticles can be evenly dispersed on the carbon carrier, have weak agglomeration, and the platinum-carbon catalyst has a high electrochemical active area and good stability.

The application discloses a bimetallic doped hierarchical porous carbon catalyst and a preparation method and application thereof. The bimetallic doped hierarchical porous carbon catalyst is prepared from two transition metal salts and specific biomass powder as raw materials through 160-180 DEG C hydrothermal carbonization and 200-500 DEG C calcination. The catalyst has simple components, is cheap, and has a simple preparation process. The catalyst can efficiently catalyze synthesis of 2,5-furan dicarboxylic acid from 5-hydroxymethylfurfural under mild conditions. The target product has high yield and simple separation, and has a good industrial application prospect.

The utility model relates to the technical field of catalyst preparation equipment, in particular to a reaction kettle for efficiently preparing a platinum-carbon catalyst. The utility model provides a reaction kettle for efficiently preparing a platinum-carbon catalyst. The reaction kettle comprises a cart, a reaction kettle body, a controller, a pump machine, a liquid conveying pipe, a gas conveying pipe, a connecting pipe and the like, a reaction kettle body is fixedly connected to the top of a top plate of the cart, a first cavity and a second cavity are formed in the reaction kettle body, a controller is fixedly connected to the bottom of the top plate of the cart, a pump is fixedly connected to the upper portion of the front side of the reaction kettle body, one end of a liquid conveying pipe is communicated with the inner bottom of the first cavity, the other end of the liquid conveying pipe penetrates through the pump and is communicated with a connecting pipe, and a gas conveying pipe is communicated with the connecting pipe. According to the utility model, by arranging the ultrasonic vibration rod and the stirring mechanism, ultrasonic dispersion and mechanical stirring of raw materials are realized, uniformly dispersed turbid liquid is obtained, the reduction reaction can be fully carried out, platinum particles can be more uniformly loaded on a carbon carrier, and thus the performance of the prepared platinum-carbon catalyst is improved.

Provided are a carbon catalyst, an electrode, and a battery that exhibit high catalytic activity while effectively avoiding problems caused by iron. The carbon catalyst has an L / La ratio of an average carbon network plane size L to a crystallite size La of 12 or more, the average carbon network plane size L being obtained by a temperature programmed desorption analysis capable of raising the temperature to 1600 DEG C, the crystallite size La is obtained from a diffraction peak near a diffraction angle (2 [theta]) of 43 DEG in an X-ray diffraction pattern obtained by powder X-ray diffraction using a CuK [alpha] ray, and the carbon catalyst has an iron content of 3000 ppm or less.

The invention relates to the field of organic synthesis, in particular to a synthetic method of (2R, 4S)-N-BOC-4-hydroxypiperidine-2-methyl formate. The synthesis method of (2R, 4S)-N-BOC-4-hydroxypiperidine-2-methyl formate comprises the following steps: mixing a material A, a material B, potassium carbonate, sodium iodide and a solvent, and reacting to obtain a material C; mixing the material C, the material D, triethylamine and a solvent, and reacting to obtain a material E; mixing the material E, ammonia water and a solvent, and reacting to obtain a material F; and mixing the material F, di-tert-butyl dicarbonate, a palladium carbon catalyst and a solvent, and carrying out a reaction to obtain the (2R, 4S)-N-BOC-4-hydroxypiperidine-2-methyl formate. The process route is easy to operate and has no special dangerous reaction. Reaction materials are cheap and easy to obtain, and the prepared product is high in purity.