142 results about "Carbocatalysis" patented technology

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 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 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 utility model belongs to the technical field of wastewater treatment, and particularly relates to an iron-carbon catalytic Fenton reaction tank. Comprising a horizontal tank body, two sides of the horizontal tank body are provided with a water inlet and a water outlet, square tanks are distributed in the horizontal tank body and are communicated with one another, the lower part of each square tank is provided with a precipitation hopper, and a joist is fixed above each precipitation hopper. According to the utility model, the plurality of square pools which are transversely arranged are connected in series, a plurality of modularized iron-carbon fillers can be placed in each pool body, and the plurality of square pools can be flexibly provided with adding points of iron-carbon and Fenton hydrogen peroxide, so that the oxidation-reduction capability of an iron-carbon primary battery and the strong oxidation capability of Fenton are fully coupled; meanwhile, the iron-carbon filler of a single module can be hoisted by a walking type electric hoist to check the hardening condition or be replaced, so that the operation flexibility is greatly improved, the problem of maintenance and replacement of iron-carbon scaling is solved, and in addition, on the basis of retaining the original biochemical pool structure, rapid transformation can be realized through the serial pool body.

The invention relates to the technical field of platinum-carbon catalysts, in particular to a preparation method of a platinum-carbon catalyst. The preparation method comprises the following steps: adding a carbon carrier into a polyol solvent, then adding an acidic dispersing aid, and dispersing to obtain a carbon carrier dispersion liquid; adding a platinum precursor solution into the carbon carrier dispersion liquid, and dispersing to obtain a mixed liquid; adding an alkaline regulator into the mixed solution, regulating the pH value of the system to be alkaline, and dispersing in an inert atmosphere to obtain a liquid mixture; heating the liquid mixture to carry out reduction reaction, then cooling, adjusting the pH value of the cooled product solution to be acidic, and carrying out post-treatment to obtain a solid substance; and heating the solid substance in an inert atmosphere for heat preservation, cooling and grinding to obtain the platinum-carbon catalyst. The carbon carrier dispersion liquid is prepared by jointly mixing the acidic dispersing aid, the carbon carrier and the polyol solvent, so that uniform dispersion and surface property optimization of the carbon carrier are realized, and a foundation is laid for subsequent uniform loading of platinum particles.

The application provides a continuous palladium-carbon hydrogenation reaction method, which is carried out according to the following steps: step one, mixing carbon catalyst with a solvent, and then injecting into the inside of a reactor; step two, connecting and starting a circulating pump to make the inside catalyst partially flow in a circulating mode; step three, injecting p-nitrotoluene and hydrogen, and carrying out heat exchange treatment on the whole reactor through a heat exchanger to keep the temperature stable during the reaction; and step four, discharging the reaction liquid and carrying out filtration treatment. The continuous palladium-carbon hydrogenation reaction method and equipment optimize the catalytic effect of the catalyst, improve the filtration efficiency, ensure that the raw material liquid and hydrogen enter the reactor, make the catalyst freely flow in the whole reaction area without being discharged from the reactor, continuously remove the product from the reactor, keep the temperature stable during the whole reaction process through the heat exchanger, and automatically stir the inside through the hydrogen injection.

The invention discloses titanium-containing leather, which is prepared from a solvent-free PU (polyurethane) mixture prepared by mixing a component A and a component B through blade coating, baking, base cloth attaching and separation processes, and the component A comprises the following components in percentage by mass: 80-85% of polyether polyol, 12-15% of polyester polyol, 2-8% of nano titanium powder, 0.2-0.6% of a zinc-bismuth compound and 0.1-0.4% of a platinum-carbon catalyst. By adding nano titanium powder into a solvent-free PU mixture and combining a specific component ratio and a preparation process, the product has good high temperature resistance, super-strong corrosion resistance and antibacterial property and is suitable for various application scenes such as outdoors, home furnishing, fitness equipment and the like, the leather is endowed with excellent mechanical properties due to the super strength of titanium, the leather is suitable for lightweight design, and the cost is reduced. The leather material has the advantages of high temperature resistance, corrosion resistance, biocompatibility and the like, can be widely applied to the fields of new energy automobiles and aerospace, has excellent biocompatibility, and meets the requirements of scenes such as medical and physical therapy equipment, children products, dining table mats and the like on material safety.

The invention discloses an iron-carbon catalytic material based on coal gasification slag as well as a preparation method and application of the iron-carbon catalytic material, and belongs to the technical field of industrial solid waste recycling. The preparation method comprises the following steps: adding dried coal gasification slag into an oxalic acid solution for extraction to obtain a suspension A; adding a reducing agent into the suspension A, carrying out precipitation reaction, and then carrying out solid-liquid separation to obtain a solid B; and sintering the solid B to obtain the composite material. The invention further discloses the iron-carbon catalytic material based on the coal gasification slag prepared by the method and application of the iron-carbon catalytic material. According to the method, the industrial solid waste coal gasification slag is used as a carrier, endogenous iron in the coal gasification slag is converted by adopting an acid leaching-reduction precipitation-roasting method, the iron-supported catalytic material with a stable structure and excellent performance is obtained, the process is green, the cost is low, the organic wastewater treatment capacity is excellent, and the practical value is relatively good.

The invention relates to a ball-milling modified biomass carbon material as well as a preparation method and application thereof, and belongs to the field of electro-catalytic materials. The preparation method comprises the following steps: cleaning, drying and crushing biomass, and collecting 40-100-mesh particles to obtain biomass powder; heating and carbonizing the biomass powder under an inert atmosphere condition, dipping a carbonized product in an acid solution to remove ash, then washing with a washing solution until filtrate is neutral, and carrying out solid-liquid separation to take a solid phase, so as to obtain an activated carbon material; mixing and ball-milling the activated carbon material and ball-milling beads to obtain the ball-milling modified biomass carbon material. The material comes from solid waste, the preparation process is simple, chemical reagents do not need to be added, and the carbon catalyst prepared through the ball milling method has good conductivity and electrocatalytic hydrogen peroxide production performance and is good in stability. Under a neutral condition, the catalyst has high selectivity. In addition, waste lychee shells are used as raw materials, the cost is low, the lychee shells are easy to obtain, and secondary utilization of solid waste is achieved.

This invention provides a composite derived carbon catalyst, its preparation method, and its application, belonging to the field of wastewater degradation technology. The preparation method includes the following steps: immersing denim single-thread fibers in a sodium hydroxide solution for ultrasonic treatment, followed by sequential drying and crushing; immersing fibrous denim in an iron salt aqueous solution, adding sodium hydroxide solution dropwise, and then sequentially allowing it to stand and dry; subjecting the dried product to pyrolysis under a nitrogen atmosphere, and post-treating the carbonized product to obtain the composite derived carbon catalyst. In this invention, iron clusters are uniformly distributed on the surface of the denim fiber-derived carbon, fully exposing active sites and thus providing higher catalytic activity and better degradation effect. This catalyst efficiently degrades various pollutants such as dyes, antibiotics, and phenols in wastewater within a wide pH range of 3-9, exhibiting the advantage of wide applicability.

This invention belongs to the field of catalyst technology, specifically relating to a polyoxometalate-anchored cobalt single-atom catalyst, its preparation method, and its application. The invention uses a polyoxometalate as the anchoring substrate and electronic control unit. First, a cobalt-substituted polyoxometalate precursor is prepared via a coordination reaction, then composited with a ZIF-derived conductive carbon substrate, and finally reduced with hydrogen to obtain the target catalyst. This catalyst effectively inhibits cobalt single-atom aggregation, achieving a cobalt single-atom loading of 3.55 wt%. Under alkaline conditions, it exhibits excellent oxygen reduction catalytic activity, stability, and methanol resistance, with a half-wave potential of 0.826 V. When used in a zinc-air battery, it achieves an open-circuit voltage of 1.48 V and a flow rate of 239.6 mW / cm². 2 With maximum power density and excellent cycle stability, it can replace commercial platinum-carbon catalysts.

This invention relates to a mesoporous platinum@platinum-nickel core-shell framework nanowire and its preparation method, comprising the following steps: (1) uniformly mixing platinum precursor, nickel precursor, structure directing agent, and reducing agent with a first solvent, and performing a hydrothermal reaction to obtain Pt@Pt-Ni core-shell nanowires; (2) uniformly mixing the Pt@Pt-Ni core-shell nanowires with a second solvent and acetic acid, and performing an etching reaction to obtain etched mesoporous platinum@platinum-nickel core-shell framework nanowires. This invention employs a hydrothermal method, which is simple, reproducible, and allows for batch production with safety. Compared with traditional commercial platinum-carbon catalysts, the catalytic activity is greatly improved, the stability is greatly enhanced, and the production cost is reduced.

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.

A sulfur-modified iron-nitrogen-carbon catalyst and its preparation and application. The present application relates to a preparation method of a series of sulfur-doped iron-nitrogen-carbon catalysts with high catalytic activity obtained by changing the addition amount of thiourea in the catalyst synthesis process and its application. Even under the water quality conditions containing a series of high-concentration inorganic anion humic acid, the catalyst can still achieve high-efficiency degradation of hydroxybenzoic acid. The sulfur atom doping plays a very important role in improving the activity of the main catalytically active site Fe-N4 activated persulfate, forming a catalytic reaction system dominated by singlet oxygen active groups, and realizing selective degradation of organic pollutants with different molecular structures, not only meeting the requirements of high catalytic activity, high stability and high adaptability of the catalyst, but also providing an effective preparation method for improving the catalytic activity of the traditional Fe-N4 structure site, which has good prospects in the application field of degrading organic wastewater containing a large amount of complex matrix.

The invention provides a biomass pyrolysis gas self-heating type carbon catalytic reforming carbonization activation gasification system and method, and relates to the technical field of catalytic reforming. The system comprises a gasification furnace and at least one carbonization activation furnace. A synthesis gas outlet of the gasification furnace is connected with the dust removal device and the intercooler; a gas outlet of the intercooler is communicated with the pressure swing adsorption device; cO2-rich gas and CO + H2-rich gas are separated by the pressure swing adsorption device and are respectively stored in a first gas storage cabinet and a second gas storage cabinet; proportional valves are arranged at gas outlets of the two gas storage cabinets, and mixed gas entering a smoke cooling balance gas inlet of a combustor of the energy-supply oxygen-deficient combustion chamber is adjusted and introduced into the energy-supply oxygen-deficient combustion chamber of the carbonization activation furnace for cooling; a combustion cracking gas inlet of a combustor of the energy supply oxygen-deficient combustion chamber is communicated with a gas outlet of the intercooler and a gas collecting assembly of the carbonization activation furnace, and a carbon material and clean fuel gas are produced by mixing an activating agent. The system realizes all-component graded utilization of synthesis gas and closed-loop recovery of heat energy, and solves the problems of waste heat waste, large carbon emission and insufficient temperature control precision in the traditional process.

The invention relates to the technical field of compound synthesis, in particular to a synthesis method of N, N-dimethylaminoethoxyethanol. The synthesis method comprises the following steps: mixing diglycolamine, a formaldehyde aqueous solution, a palladium carbon catalyst and hydrogen, and carrying out methylation reaction. The synthesis method is simple to operate, high in reaction conversion rate, high in product purity and good in economical efficiency.

The application discloses a preparation method of a sludge source iron-based metal organic framework derived carbon material. Mainly, the iron-rich industrial sludge and the printing and dyeing white mud containing terephthalic acid are synthesized into the sludge source MOFs material through a solvothermal method, and then the sludge source iron-based metal organic framework derived carbon catalyst is prepared through a high-temperature pyrolysis method without adding additional chemical raw materials. The application provides a preparation method for converting two kinds of sludge into a high-value iron-based metal organic framework derived carbon catalyst, and the performance of the catalyst synthesized by using pure sludge is better than that of the MOFs derived carbon catalyst synthesized by using pure chemical reagents, realizes high-value utilization of the sludge, changes waste into treasure, has low preparation cost, is pollution-free, and has wide application prospects in treating organic dyes in water.

The application discloses an activated persulfate catalyst and a preparation method and application thereof, and relates to the technical field of catalysts.The catalyst is a bismuth-carbon intercalation catalyst in a chain structure, and the preparation method comprises the following steps: S1, taking a bismuth salt and an acyl benzene ligand as reaction substrates, and synthesizing Bi-MOFs through a hydrothermal reaction; and S2, calcining the Bi-MOFs at 500-700 DEG C under an inert gas atmosphere to obtain the bismuth-carbon intercalation catalyst.The bismuth-carbon intercalation catalyst activates persulfate through a non-radical direct electron transfer path, has higher activity and selectivity, can more effectively sterilize and disinfect specific structures and metabolic processes of target microorganisms, and improves the treatment efficiency; and can reduce the generation of by-products, effectively reduces the risk of the environment and the human body.

This invention discloses a compound of formula I and a method for preparing minocycline hydrochloride. The method for preparing compound I involves dissolving 6-demethyltetracycline in acidic water, adding a chlorination reagent for chlorination, then adding p-aminobenzenesulfonic acid diazonium hydrochloride and alkaline solution for coupling reaction, followed by post-treatment. The method for preparing minocycline hydrochloride uses 6-demethyltetracycline as a starting material, proceeding through the intermediate of compound I, and removing the C7 chlorine, p-aminobenzenesulfonic acid group, and C6 hydroxyl group via catalytic hydrogenation, followed by reductive amination and post-treatment. This invention achieves low-pressure palladium-carbon catalytic removal of the C6 hydroxyl group by introducing an electron-donating amino group at the C7 position, eliminating the need for expensive rhodium-carbon catalysts. The reaction conditions are mild, column chromatography purification is unnecessary, the overall yield is ≥85%, and the product purity is ≥96%, making it suitable for industrial production.

The present application belongs to the technical field of catalyst preparation, and relates to a preparation method and application of a black and odorous water sludge-based carbon catalyst. The preparation method of the black and odorous water sludge-based carbon catalyst comprises the following steps: (1) mixing, drying and grinding black and odorous water sludge and non-sludge biomass materials to obtain carbon-increased sludge; and (2) activating the carbon-increased sludge with an activator, pyrolyzing and cooling the carbon-increased sludge in an inert atmosphere to obtain the black and odorous water sludge-based carbon catalyst. The present application improves the carbon content of sludge carbon, reduces the yield, ash content, conductivity and element ratios of H / C, N / C and O / C of sludge carbon by co-pyrolyzing black water sludge and non-sludge biomass materials. In addition, co-pyrolysis reduces the content and toxicity of heavy metals in biochar. Co-pyrolysis of black and odorous water sludge and non-sludge biomass materials rich in C elements not only simultaneously disposes the sludge and non-sludge biomass materials, but also improves the C element content of biochar, thereby improving the catalytic ozone activity of the biochar.

The invention relates to a catalytic synthesis method of N, N-dimethylethanolamine. The method comprises the following steps: preparing reaction raw materials ethanolamine, methanol and a ruthenium / carbon catalyst in proportion; the method comprises the following steps: adding raw materials ethanolamine, methanol and a ruthenium / carbon catalyst into a high-pressure reaction kettle; replacing air in the reaction kettle with nitrogen for three times, starting stirring, mixing and heating reactants, and carrying out heat preservation reaction; after the reaction is finished, cooling the reaction kettle, and exhausting; opening the reaction kettle, filtering the reaction mixture, and recovering the solid catalyst; and distilling the filtrate at normal pressure to recover excessive methanol, then carrying out reduced pressure distillation, and collecting corresponding fractions to obtain N, N-dimethylethanolamine. The method has the advantages that the N, N-dimethylethanolamine is prepared through the reaction of ethanolamine and methanol under the catalytic action of the ruthenium / carbon catalyst, the catalytic reaction activity is high, the selectivity is good, the reaction condition is mild, the yield is high, the catalyst can be recycled and reused, the method is environmentally friendly, and the production cost is reduced.

The invention relates to a boron-doped carbon carrier, a boron-doped platinum-carbon catalyst, and preparation methods and applications of the boron-doped carbon carrier and the boron-doped platinum-carbon catalyst. The preparation method of the boron-doped platinum-carbon catalyst comprises the following steps: mixing and grinding a porous carbon material and phenylboronic acid according to a mass ratio of 1: (1.5-6), and roasting in an inert atmosphere at 600-900 DEG C to obtain a boron-doped carbon carrier; and mixing the boron-doped carbon carrier with a platinum precursor solution, adding an alcoholic solution, adjusting the pH value to 7-8 by using alkali liquor, heating and reducing in an oil bath at 80 DEG C for 4 hours, and washing and drying to obtain a final product. According to the invention, the interaction between the platinum and the carbon carrier is enhanced through boron doping, the average particle size of platinum nanoparticles of the obtained platinum-carbon catalyst is 2-3 nm, and the platinum-carbon catalyst has the advantages of uniform dispersion, high hydrogen evolution activity, good stability and the like, and is especially suitable for proton exchange membrane water electrolysis cathode hydrogen evolution reaction.

The application discloses an atomic transition metal modified nitrogen-carbon catalyst and a preparation method and application thereof, and relates to the technical field of environmental functional materials.The atomic transition metal modified nitrogen-carbon catalyst is composed of edge-sharp wrinkle nanosheets, and the wrinkle nanosheets comprise an N3C carrier and transition metals uniformly distributed on the N3C carrier in the form of single atoms and atomic clusters.The atomic transition metal modified nitrogen-carbon catalyst is obtained by modifying transition metal atoms on the basis of nitrogen-carbon, constructing a metal active center, increasing the light-heat absorption capacity of the material, and not damaging the inherent morphology of the catalyst, so that the atomic transition metal modified nitrogen-carbon catalyst has high light-heat conversion capacity, can activate active oxygen species by activating molecular oxygen, and can realize efficient light-heat catalytic inactivation of pathogenic microorganisms by combining the physical and chemical synergistic effects of the sharp edges of the material.

The present invention provides a method for preparing a supported carbon catalyst, the method comprises at least the following steps: (1) contacting a gas containing an organic silicon source with a silicon oxide-based material to obtain a precursor; (2) contacting the precursor with a gas containing an organic carbon source to obtain the supported carbon catalyst. The temperature and energy consumption of the chemical vapor deposition of heteroatom-containing carbon material on silica-based materials can be greatly reduced in this method, and the cost of the catalyst can be effectively reduced.

The invention discloses a method for preparing a confined iron-based porous carbon catalyst from a compound extracted from printing and dyeing alkali-decrement white mud and application of the confined iron-based porous carbon catalyst. The specific method is as follows: the printing and dyeing alkali-decrement white mud is uniformly dispersed in an organic solvent, filtrate containing terephthalic acid is extracted through oscillation and suction filtration, then ferric trichloride hexahydrate is dropped into the filtrate, and the filtrate is filtered to obtain the confined iron-based porous carbon catalyst. Performing stirring hydrolysis and hydrothermal reaction to synthesize an MIL-101 (Fe)-W precursor, and performing pyrolysis in an inert atmosphere to obtain the confined iron-based porous carbon catalyst Fe (at) C-W. The catalyst has a high specific surface area and a confinement structure, and the prepared catalyst can be used for activating hydrogen peroxide to degrade organic pollutants. The industrial waste is recycled, and the catalyst is high in degradation efficiency, suitable for a wide pH range and good in stability.

The application discloses a modified carbon black material, a preparation method thereof and application of the modified carbon black material in a fuel cell catalyst, and relates to the technical field of fuel cell catalysts. The preparation method of the modified carbon black material comprises the following steps: (1) a carbon black material is subjected to a crushing treatment, and after sieving, a carbon black powder is obtained; (2) the carbon black powder is placed in a mixed solution of a small-molecule organic acid and a solvent, and a modification reaction is carried out to obtain a modified mixture; and (3) the modified mixture is subjected to positive pressure filtration and drying to obtain the modified carbon black material. The small-molecule organic acid is used to modify the carbon black material, the modified carbon black material has rich carboxyl functional groups, and the pore volume is adjusted, so that when the modified carbon black material is applied to the preparation of a fuel cell platinum-carbon catalyst, platinum can be guided into pores, the loading of platinum is facilitated, the size of platinum nanoparticles is limited, and the comprehensive performance of the platinum-carbon catalyst is improved.

The invention relates to the technical field of nano energy catalytic materials, in particular to an electrocatalyst for hydrogen production by water electrolysis of a proton exchange membrane, a preparation method and application of the electrocatalyst. The preparation method comprises the following steps: uniformly mixing ruthenium salt, nickel salt, bismuth salt, a solid surfactant, a reducing agent and a liquid surfactant, and heating and stirring to obtain a solid catalyst; the solid catalyst is placed in an acid solution for acid treatment, and the proton exchange membrane water electrolysis hydrogen production electrocatalyst is obtained. The electrocatalyst for hydrogen production by water electrolysis of the proton exchange membrane has high catalytic activity on hydrogen evolution, and has lower overpotential and higher stability compared with commercial platinum-carbon and commercial ruthenium-carbon catalysts.

This application relates to a method for preparing piperidine and a trickle-flow reaction apparatus. The method for preparing piperidine includes: using a trickle-flow reaction apparatus, which includes a reaction vessel with an open top, a feed pipe inserted into the reaction vessel, a top-closed collection vessel fitted outside the reactor, and a heating assembly for heating the reaction vessel. The temperature of the reaction vessel is 160℃~200℃. A catalyst is fixed inside the reaction vessel, and the outlet end of the feed pipe is lower than the fixed position of the catalyst. The preparation process includes: adding liquid pentanediamine into the reaction vessel through the feed pipe; vaporizing the liquid pentanediamine through the heating assembly to obtain gaseous pentanediamine; and contacting and reacting the gaseous pentanediamine with a ruthenium-carbon catalyst. This method for preparing piperidine results in a low reaction temperature, high conversion rate, and high purity of the crude product.