117 results about "Cobalt metal" patented technology

The invention relates to the technical field of metallurgy, in particular to an efficient-utilization copper-cobalt ore dump leaching treatment method which comprises the steps that after copper-cobalt sulfide ore and copper-cobalt oxide ore are subjected to crushing treatment respectively, heap building is conducted; a solution of acidithiobacillus ferrooxidans is added into a sulfuric acid solution to serve as spraying liquid, heap leaching treatment is conducted on the heap-built copper-cobalt ore through a spraying device, and the spraying flow of the spraying device is controlled in the heap leaching treatment process according to changes of the environment temperature and humidity and changes of the pH value of heap leaching liquid; the obtained dump leaching liquid is subjected to extraction-electrodeposition treatment, and cathode metal copper, sediment and raffinate are obtained; and the raffinate serves as spraying liquid to be subjected to spraying circulation, precipitation is neutralized, and metal cobalt is recycled. The spraying flow of the spraying device is accurately controlled and adjusted, and the leaching effect of copper and cobalt metal in the copper-cobalt ore is improved.

The invention relates to the technical field of electrocatalysts, and discloses a heterojunction catalyst composed of cobalt-copper co-doped ruthenium dioxide and metal ruthenium as well as a preparation method and application of the heterojunction catalyst. The preparation method comprises the following steps: carrying out hydrothermal reaction on cobalt salt and trimesic acid in a mixed solvent to prepare a cobalt metal organic framework precursor; a cobalt-copper bimetal organic framework is obtained through ion exchange of a copper salt solution; preparing a ruthenium-cobalt-copper ternary metal organic framework by adopting secondary ion exchange of a ruthenium salt solution; and carrying out air calcination treatment to obtain the cobalt-copper co-doped ruthenium dioxide and metal ruthenium heterojunction catalyst. According to the method, cobalt and copper atoms are uniformly doped in ruthenium dioxide crystal lattices through a step-by-step ion exchange strategy, and metal ruthenium nano-particles are grown on the surface in situ to form a heterogeneous interface. The obtained catalyst shows excellent performance in an acidic electrolyzed water anode oxygen evolution reaction, the overpotential is only 199 mV under the current density of 10 mA. Cm, and the stability can be maintained for 40 hours.

The invention discloses a nickel-cobalt metal-based wear-resistant and corrosion-resistant coating and a preparation method thereof, and relates to the technical field of surface coatings, and the technical key points of the nickel-cobalt metal-based wear-resistant and corrosion-resistant coating comprise the following steps: S1, carrying out oil removal and sand blasting roughening treatment on the surface of a metal substrate, then cleaning with absolute ethyl alcohol, and drying; s2, nickel-cobalt metal-based alloy powder is prepared, wherein the nickel-cobalt metal-based alloy powder is prepared from, by weight, 55-65 parts of nickel, 20-30 parts of cobalt, 15-18 parts of chromium, 4-6 parts of molybdenum, 3-5 parts of tungsten, 1-3 parts of iron, 0.8-1.5 parts of silicon, 0.5-1.2 parts of carbon and 0.5-1.0 part of boron; the technical effect is that a regular non-smooth micro-pit array is manufactured on the surface of a sprayed layer through interlayer laser micro-texturing treatment. And the molten particles of the next layer of spraying material are embedded into the micro pits to form a strong mechanical interlocking effect, so that the interlayer bonding strength and the anti-shearing capability are greatly improved, and interlayer dislocation and stripping are effectively prevented.

The present invention discloses a cobalt-based armor nanozyme and its preparation method and application. The method comprises uniformly mixing a cobalt salt solution, a 2,2'-bipyridine solution, and a g-C3N4 dispersion, performing sufficient reaction followed by pretreatment to obtain a precursor, and grinding and calcining the precursor to obtain the cobalt-based armor nanozyme. The cobalt-based armor nanozyme prepared by the present invention has high catalytic activity and the stability of carbonaceous materials. While ensuring efficient catalysis, it greatly reduces secondary pollution caused by cobalt metal leaching. The cobalt-based armor nanozyme can be used to remove organic pollutants from solid pollutants such as soil and water, and can also be used for targeted enrichment of numerous organic pollutants in contaminated wastewater, thereby improving removal efficiency.

The present application relates to the field of sodium ion battery, in particular to a kind of hard carbon negative material of fast charging sodium ion battery and preparation method thereof, for solving the shortcomings of existing hard carbon negative material of fast charging sodium ion battery, capacity is low, cycle performance is poor, limit the popularization of sodium ion battery in practical application problem;The present application can improve the conductivity and reaction kinetics of the material by doping nickel-cobalt metal oxide into nitrogen-containing hard carbon microspheres, thereby improving the theoretical capacity of the material, can significantly improve the charge-discharge rate of sodium ion battery, enhance the electrochemical performance of battery, and after being coated by composite gel structure, the structural stability of the material can be effectively improved, the volume change of the material in the cycle process is reduced, the cycle stability of sodium ion battery can be significantly improved, long cycle life and high capacity retention rate can be maintained while realizing fast charging, prolong the service life of battery.

The invention provides a lithium battery valuable metal separation and recovery method based on multi-stage synergistic extraction. The method comprises the following steps: obtaining an electrode material from a waste lithium battery, and crushing and roasting the electrode material; carrying out multi-stage extraction on the roasted electrode material, and sequentially carrying out lithium element extraction, cobalt and nickel element extraction and manganese element extraction; and carrying out back extraction, separation and metal recovery on the lithium-containing organic phase, the cobalt-nickel-containing organic phase and the manganese-containing organic phase obtained by the multi-stage extraction to respectively obtain lithium carbonate, metal cobalt, metal nickel and manganese dioxide. According to the method, a multi-stage synergistic extraction process is adopted, a specific extraction agent and optimized extraction conditions are selected according to the properties of different valuable metals in the lithium battery, and the valuable metals are extracted in a graded and coordinated manner in combination with a pi-pi conjugated amphiphilic dissolution aid, so that the valuable metals such as lithium, cobalt, nickel, manganese and the like are efficiently separated and recycled, and the resource utilization rate is effectively increased.

This invention discloses a SiC-supported LDH nanocomposite material, its preparation method, and its application as a microwave absorbing and corrosion-resistant material. The SiC-supported LDH nanocomposite material has a core-shell structure, wherein the core is silicon carbide nanowires and the shell is a layered bimetallic hydroxide doped with a third metal. nw The loading of the third metal-doped layered bimetallic hydroxide is 43.1%–168%. This invention improves the microwave absorption performance of the composite material by adjusting the LDH shell content and doping the LDH with cobalt to form a ternary LDH. Furthermore, the core-shell structure of the SiC-loaded LDH nanocomposite not only provides multiple scattering conditions for microwaves but also acts as a physical barrier, extending the corrosion path and acting as a labyrinth effect to hinder the intrusion of corrosive media. Moreover, the LDH memory effect and anion exchange effect further resist chloride ion intrusion, achieving a lightweight, integrated application of microwave absorption and corrosion protection.

The application discloses a kind of bifunctional catalyst and its application in microwave-assisted preparation of biodiesel, belong to catalysis technical field.The application introduces cobalt metal in ZIF-8 skeleton, when MOFs derivative is prepared by calcination, the introduction of transition metal can construct magnetic center, adjust the magnetic loss ability of derivative material, so that the prepared catalyst has strong wave-absorbing performance under 2.45GHz industrial microwave field, can effectively absorb microwave energy and convert it into heat energy, thereby improving the energy utilization efficiency of reaction system, and finally improving the catalytic performance of catalyst, further improve the preparation efficiency of microwave-assisted biodiesel, and has good application value and prospect in catalysis technical field.

The invention discloses a cobalt / nitrogen co-doped carbon nanotube catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a carbon nanotube, a nitrogen precursor, cobalt salt and an organic solvent to prepare a mixture, and calcining to obtain the cobalt / nitrogen co-doped carbon nanotube catalyst. According to the preparation method, under the combined action of the organic solvent and the nitrogen precursor, more cobalt metal can be infiltrated into the nanotubes, cobalt / nitrogen co-doping can be completed in the calcination process, and more cobalt nanoparticles can be uniformly dispersed in pores and on the surfaces of the pores on the premise that the original pore structure of the carbon nanotubes is not damaged; the prepared catalyst is complete in pore structure, rich in active site, stable in structure and excellent in catalytic performance, can be used for efficiently activating periodate as a novel catalyst with excellent performance, can realize efficient degradation of organic pollutants, and has very important significance on water environment restoration.

The invention relates to the technical field of wastewater treatment, and particularly provides a preparation method of a boron-nitrogen co-doped cobalt monatomic catalyst, which comprises the following steps: S1, synthesizing a boron-nitrogen functionalized graphene quantum dot solution based on a graphene quantum dot precursor, an amino precursor and a boron source; and S2, obtaining the boron-nitrogen co-doped cobalt monatomic catalyst based on the boron-nitrogen functionalized graphene quantum dot solution, a cobalt source, a nitrogen source and carbon particles. According to the preparation method disclosed by the embodiment of the invention, cobalt and boron-nitrogen functional groups are subjected to chelation reaction, and cobalt monoatoms are stably and uniformly anchored on the surface of the cobalt monoatoms to improve the dispersity of the monoatoms, so that the purposes of preventing cobalt monoatom aggregation and improving the metal utilization rate are achieved. The prepared cobalt monatomic catalyst not only has high metal loading capacity (the cobalt metal loading capacity in the catalyst can reach 6-10 wt%) and monatomic dispersity, but also has high two-electron oxygen reduction capacity, and the number of active sites and the metal utilization rate in the persulfate activation process are remarkably increased.

The present invention discloses a ruthenium-doped cobalt metal oxide nanosheet electrocatalyst, its preparation method and application, which relates to the technical field of electrocatalysts. The preparation method is as follows: Weigh cobalt salt and trimesic acid and dissolve them together in a methanol solution. After a first ultrasonic mixing treatment, a mixed solution A is obtained; Drop the methanol solution containing ruthenium salt into the mixed solution A. After a second ultrasonic mixing treatment, a mixed solution B is obtained. The mixed solution B is subjected to a hydrothermal reaction to obtain a ruthenium-cobalt metal-organic framework precursor; The ruthenium-cobalt metal-organic framework precursor is subjected to a calcination treatment. Compared with the prior art, the ruthenium-doped cobalt metal oxide nanosheet electrocatalyst prepared by the present invention exhibits excellent hydrogen evolution electrocatalytic activity and stability in the alkaline water electrolysis reaction. The performance of this catalyst is superior to that of commercial platinum-carbon catalysts, and it can maintain a stable potential output during continuous testing for 100 hours without obvious attenuation.

The invention discloses an in-situ growth carbon nanotube loaded iron-cobalt bifunctional catalyst as well as a preparation method and application of the in-situ growth carbon nanotube loaded iron-cobalt bifunctional catalyst, and relates to the technical field of zinc-air batteries. Comprising a nitrogen-iron co-doped carbon nanotube conductive network and iron-cobalt metal atoms loaded on the carbon nanotube conductive network, the nitrogen-iron co-doped carbon nano tube is used as a conductive network, the stable structure of the carbon nano tube is not affected, meanwhile, the carbon nano tube has a rich pore structure, rich iron-based active sites and a high specific surface area, iron-cobalt metal atoms are attached to the carbon nano tube more easily, and excellent catalytic performance is shown; the preparation method comprises the following steps: preparing a carbon nanotube conductive network, then loading iron-cobalt metal atoms on the conductive network, so that more iron-cobalt metal atoms are uniformly and firmly attached to the carbon nanotube conductive network, and through the interaction between iron-cobalt diatom catalytic active sites, the dual-function catalysis of ORR and OER is realized, and the performance of the zinc-air battery is improved.

A cobalt metal complex of 2-amino-4-hydroxy-6-methylpyrimidine, whose structural formula is as follows: #imgabs0# The synthesis method of the 2-amino-4-hydroxy-6-methylpyrimidine cobalt metal complex crystal I is to separately weigh CoCl2·6H2O (0.949 g, 3.99 mmol) and the ligand 2-amino-4-hydroxy-6-methylpyrimidine (1.0 g, 7.9 mmol)), dissolve them in 100 mL of anhydrous methanol and 25 mL of water, and reflux and stir for 30 hours. Perform hot filtration and allow natural evaporation at room temperature. After 3 days, light red crystals appear. The use of the 2-amino-4-hydroxy-6-methylpyrimidine cobalt metal complex crystal I is as an anticancer reagent, showing certain inhibitory activity in liver cancer cell experiments, and its IC 50 value is 21.72 ± 0.78.

The invention relates to the technical field of sewage treatment, in particular to preparation of a cobalt metal alkene-doped tungsten disulfide piezoelectric material and application of the cobalt metal alkene-doped tungsten disulfide piezoelectric material in synergistic degradation of antibiotics and hexavalent chromium. The material is prepared by combining a hydrothermal synthesis method with a chemical vapor deposition technology, and cobalt metal alkene is uniformly doped in a tungsten disulfide nanosheet layer to form a composite catalyst with excellent piezoelectric property. The material realizes efficient synergistic degradation of antibiotics and hexavalent chromium under the ultrasonic action, and has good cycle stability. The preparation method provided by the invention is simple and low in cost, and the obtained material has wide application prospects in the fields of sewage treatment, environmental remediation and the like, and is particularly suitable for efficient synergistic treatment of combined pollution.

[Problem] To provide: a nickel plating film that has suitable bath stability, pattern deposition properties, and plating deposition properties in a fine pad part, and excellent in solder connection reliability and surface smoothness; and an electroless nickel plating solution useful for forming the plating film. [Solution] A nickel plating film is formed on an object to be plated by subjecting the object to be plated to surface treatment using an electroless nickel plating solution that contains at least S2+ and a Co metal and in which the Co metal is included in the form of Co2+ and Co3+.

This application provides a method for recovering nickel and cobalt elements, which involves acid leaching a mixed slurry comprising laterite nickel ore and a hard material to separate a solution containing nickel and cobalt elements; wherein the hard material comprises quartz sand and / or mullite. This recovery method utilizes the high hardness of the hard material to achieve online cleaning of scale layers inside the reactor, thus avoiding contamination of the acid leaching system and solving the problem of scale accumulation inside the reactor, thereby effectively improving the production efficiency of nickel and cobalt metals.

The application provides a ternary composite nanofiber for marine metal corrosion prevention and electromagnetic wave absorption, and a preparation method and application thereof. The preparation method of the ternary composite nanofiber comprises the following steps: (1) preparation of a precursor solution: dispersing copper salt and a cobalt compound in a first solvent, stirring until fully dissolved, adding a polymer, and uniformly mixing to obtain the precursor solution; (2) preparation of a nanofiber membrane: electrospinning the precursor solution to obtain a nanofiber membrane loaded with copper and cobalt metal ions; (3) carbonization: drying the nanofiber membrane, and performing high-temperature treatment after drying, so that the ternary composite nanofiber for marine metal corrosion prevention and electromagnetic wave absorption is obtained. The preparation method of the ternary composite nanofiber is simple, low in cost, and has great application prospect in electromagnetic wave shielding in marine and other corrosive environments.

The invention relates to the technical field of zinc-air batteries, and particularly discloses a quasi-solid zinc-air battery cathode material as well as a preparation method and application thereof. According to the cathode material, carbon black particles with aminated surfaces are used as a carrier, and ruthenium-cobalt bimetallic active components are loaded as a catalytic center. The preparation method of the cathode material comprises the following steps: dispersing aminated carbon black particles, ruthenium metal salt and cobalt metal salt in a water / methanol mixed solution, carrying out ultrasonic dispersion, and carrying out a hydrothermal reaction at a certain temperature; centrifuging, washing and drying the reaction product to obtain a solid precursor; and finally, carrying out thermal annealing treatment on the solid precursor under the inert gas protection condition to obtain the cathode material. The cathode material provided by the invention is suitable for an air cathode of a quasi-solid-state zinc-air battery, and has good catalytic activity and application prospect.

The present invention discloses a method for preparing high-purity cobalt by deeply purifying copper and nickel ions in a cobalt solution, which relates to the technical field of cobalt metal purification and preparation. High-purity cobalt is prepared through three steps: replacing Cu ions with cobalt powder, adsorbing Ni ions with resin, and cobalt electrowinning. Cobalt powder is added to the cobalt solution containing Cu and Ni impurity ions, stirred and mixed to replace Cu elemental precipitation and obtain a filtrate, and a Cu-rich pure solution is obtained after extraction. The filtrate passes through an ion exchange resin column to adsorb Ni<supgt;2+< / supgt; on the ion exchange resin, and the resin exchange post-liquid is subjected to insoluble anode electrowinning to obtain high-purity cobalt with a purity of 5N. Through the analysis and prediction of the Ni<supgt;2+< / supgt; adsorption process, the adjustment of the ion adsorption time is realized; the present invention has low cost, simple operation, high production efficiency, and maximizes the resource utilization of recycled copper and nickel, which is of great significance to the industrial preparation technology of high-purity cobalt.

The invention belongs to the technical field of electrochemical oxygen reduction, and relates to a preparation method and application of a high-dispersion mesoporous carbon sphere loaded nano platinum-cobalt intermetallic compound electrocatalytic oxygen reduction material, a high-dispersion mesoporous carbon sphere precursor is firstly prepared, then the high-dispersion mesoporous carbon sphere precursor is subjected to high-temperature carbonization treatment to obtain high-dispersion mesoporous carbon spheres, and the high-dispersion mesoporous carbon spheres are subjected to high-temperature carbonization treatment to obtain the high-dispersion mesoporous carbon sphere loaded nano platinum-cobalt intermetallic compound electrocatalytic oxygen reduction material. Then, mesoporous carbon spheres loaded with platinum-cobalt intermetallic compound precursors are prepared on the basis of the obtained high-dispersion mesoporous carbon spheres, finally, the mesoporous carbon spheres are subjected to high-temperature heat treatment, and finally the high-dispersion mesoporous carbon sphere loaded nano platinum-cobalt intermetallic compound electro-catalytic oxygen reduction material is prepared. According to the invention, the high specific surface area and regular pore structure of the mesoporous carbon spheres are utilized to realize high dispersion and confinement of the platinum-cobalt precursor, and intermetallic compound nanoparticles with uniform size and uniform distribution are formed through heat treatment. The obtained material has high precious metal utilization rate and excellent stability, the synthesis method is simple, operation is easy and convenient, repeatability is high, and large-scale production is easy to achieve.

This invention belongs to the field of catalyst preparation technology, specifically disclosing a hydrotalcite-derived metal oxide catalyst, its preparation method, and its application. The preparation method includes the following steps: dissolving cobalt and aluminum metal salts in deionized water to obtain solution A; dissolving copper metal salt in deionized water to obtain solution B; preparing an alkaline precipitant solution C containing hydroxide and carbonate ions; under heating conditions, adding solution C dropwise to solution A while vigorously stirring, adjusting the pH to alkaline, obtaining a mixed solution; simultaneously titrating solution B and solution C together into the mixed solution, adjusting the pH to alkaline, aging the reaction, washing, drying, grinding, and calcining in an oxygen atmosphere to obtain the hydrotalcite-derived metal oxide catalyst. This hydrotalcite-derived metal oxide catalyst can promote the adsorption and conversion of NH3 and the generation of N2, showing good application prospects in the selective catalytic oxidation and degradation of NH3.

The invention relates to the technical field of photocatalysis, and discloses a photocatalyst and a preparation method thereof.The photocatalyst comprises a 3D honeycomb-shaped nitrogen-doped graphite carbon loaded cobalt metal catalyst; the non-noble metal hydroxide is loaded on the surface of the 3D honeycomb-shaped nitrogen-doped graphite carbon loaded cobalt metal catalyst. The photocatalyst has sufficient active sites, can effectively improve the activation rate and conversion rate of reactants in a carbon dioxide reduction reaction, and also has relatively high carrier separation efficiency, so that the number of photo-induced electrons and hole pairs participating in photocatalysis is increased, and the reduction reaction has relatively high quantum efficiency.

The invention provides a method for preparing high-value-added acid and hydrogen by electrooxidizing biomass sugar with a nickel-cobalt catalyst, which is characterized in that a platinum net is used as a cathode catalyst, cobalt metal loaded on a foamed nickel substrate is used as an anode catalyst, and a high-value-added organic acid product is obtained at an anode while high-efficiency hydrogen preparation is realized by applying constant voltage. The method has the advantages of high hydrogen / organic acid selectivity, mild conditions and low material cost, is suitable for large-scale production, and has excellent industrial application prospects.

A method for laser cladding a gradient layer on the surface of a copper continuous casting crystallizer relates to a surface repair method for continuous casting crystallizers. The laser cladding gradient layer of this invention consists of an iron-based cladding layer and a nickel-based cladding layer. The iron-based cladding layer, serving as a transition layer, is composed of pure iron and pure cobalt metal powders. The nickel-based cladding layer, serving as the working layer, is composed of pure nickel, pure chromium, pure cobalt, and 99.999% yttrium oxide powder. These metal powders are dried at 200°C for 2 hours, then dry-milled at low speed using Al2O3 microspheres as the grinding media. A laser is used to transfer the intersection zone of the mixed powder and the laser light onto the workpiece to prepare the laser cladding gradient layer. This invention's laser cladding gradient layer strengthens the surface of the copper continuous casting crystallizer, enabling repeated repair of the copper crystallizer and improving material utilization.

The application discloses a coke oven gas deaminating agent and a preparation method thereof. The deaminating agent takes zinc and copper metal salts as active components, nickel and cobalt metal salts as auxiliary component, and takes magnesium aluminate spinel prepared from aluminum oxide and magnesium oxide as a carrier. The deaminating agent has the characteristics of high deaminating activity, high ammonia content penetration, and renewable utilization, is used for gas phase deamination, and is particularly suitable for a coke oven gas purification process, and can reduce the ammonia content to 0.1 ppm.

The invention relates to an amino acid mediated molybdenum-doped cobalt-based three-dimensional layered heterostructure catalyst and application thereof. A preparation method of the catalyst comprises the following steps: preparing a foamed nickel substrate; the preparation method comprises the following steps: dissolving cobalt metal salt, a carbon source precursor and amino acid in a mixed solution containing N, N-dimethylformamide, ethanol and deionized water, and carrying out a hydrothermal reaction to obtain a cobalt-based precursor coated with a carbon layer; calcining the cobalt-based precursor coated with the carbon layer in an inert atmosphere to obtain a cobalt-based catalyst coated with the carbon layer; molybdenum metal salt is dissolved in deionized water, the cobalt-based catalyst coated with the carbon layer is immersed in the solution, a hydrothermal reaction is carried out, and the amino acid mediated molybdenum-doped cobalt-based three-dimensional layered heterostructure catalyst is obtained. The molybdenum-doped cobalt-based three-dimensional layered heterostructure catalyst is prepared through hydrothermal and calcination methods, and the obtained catalyst has high catalytic activity and good stability in a urea oxidation coupling hydrogen production reaction.

The application provides an oxygen-coordinated cobalt monatomic catalyst, a preparation method and application thereof. The oxygen-coordinated cobalt monatomic catalyst is composed of a porous carbon skeleton, cobalt monatomic and oxygen atoms. The specific surface area of the porous carbon skeleton is 100-3000 m 2 / g, the mass content of the cobalt monatomic is 0.01%-10%, and the mass content of the oxygen atoms is 1%-15%. The catalyst anchors the cobalt metal center by using an oxygen-rich metal organic framework, and forms Co-O-C after carbonization. In the oxygen-coordinated cobalt monatomic catalyst, the oxygen-coordinated structure can adjust the electronic structure of the central metal cobalt to promote the transfer of active sites, provide the optimal adsorption energy of the intermediate OOH, and thus improve the selectivity of 2e ‑ ORR.

The present application relates to the technical field of semiconductors, and provides a cobalt metal thin film and a preparation method therefor. The method of the present invention comprises: putting a substrate into an inner cavity, and then reacting a cobalt source with a reaction gas in such a manner that CVD and ALD are carried out at the same time, thereby depositing a cobalt metal thin film on the substrate. The present application further provides a spraying assembly, which can fully diffuse and evenly mix the cobalt source and a reducing gas before deposition, reduce the influence of the non-uniformity of a reaction area and a gas phase diffusion effect on the uniformity of deposition, and improve the film thickness uniformity of the deposited thin film. In the present application, CVD and ALD processes are combined; compared with deposition by means of ALD alone, the growth rate of the cobalt metal thin film is higher; and compared with deposition by means of CVD alone, the prepared cobalt thin film has stable growth uniformity and relatively low film resistivity.

The application relates to a method for synthesizing 2,5-furan dicarboxylic acid from 5-hydroxymethylfurfural by using a ruthenium-loaded copper-cobalt metal oxide composite magnesium oxide catalyst. The method comprises the following steps: mixing and grinding a copper-cobalt hydroxide precursor prepared by a hydrothermal-calcination method with anhydrous magnesium acetate and then calcining to obtain a catalyst carrier; and using an impregnation-reduction method to load ruthenium nanoparticles on the carrier as an active component. The synergistic effect of the active component and the carrier enables 5-hydroxymethylfurfural to be catalytically converted into 2,5-furan dicarboxylic acid in a high-efficiency and selective manner. The catalyst preparation process is simple and easy to scale up. In the absence of alkali, the conversion rate of 5-hydroxymethylfurfural can reach 100%, and the yield of 2,5-furan dicarboxylic acid is 86.1%. The semi-preparative liquid chromatography is used for green separation and purification of the product, and 2,5-furan dicarboxylic acid with a purity of more than 99% is obtained. The method has potential application value for large-scale production of 2,5-furan dicarboxylic acid.

The invention discloses a uniform thermostable polycrystalline diamond compact and a preparation method thereof, the diamond compact comprises a hard alloy matrix, a diamond layer and a transition layer arranged between the hard alloy matrix and the diamond layer, the diamond layer is a modified diamond micro powder layer, the modified diamond micro-powder is boron-doped diamond micro-powder uniformly coated with metal cobalt; the transition layer is a metal layer and is deposited on the hard alloy matrix, and the hard alloy matrix and the diamond layer are sintered at high temperature and high pressure to form the polycrystalline diamond compact. According to the composite sheet, cobalt metal is evenly distributed, cobalt-rich and cobalt-poor areas can be avoided, the thermal stability of the composite sheet is excellent, and the composite sheet is more wear-resistant.