94 results about "Hydrogen atmosphere" patented technology

The invention discloses a synthesis method and application of nitrogen-doped carbon-coated Co porous spheres, cobalt nitrate hexahydrate and 4-picolinic acid are dissolved in a mixed solution, the mixed solution comprises dimethylformamide and absolute ethyl alcohol, then the mixed solution is transferred into a reaction kettle for heating reaction, and after the reaction is finished, centrifugal drying is performed to obtain a Co coordination compound precursor; and calcining the precursor in an argon hydrogen atmosphere, and selecting and setting a proper heating rate, a proper calcining temperature and a proper calcining time to obtain the nitrogen-doped carbon-coated Co porous ball. The obtained nitrogen-doped carbon-coated Co porous ball is used as the air cathode of the zinc-air battery, so that high power density and excellent charge-discharge cycle stability are realized.

A process for producing C2 to C5 hydrocarbons, the process comprising introducing a feed stream comprising hydrogen and a carbon-containing gas selected from the group consisting of carbon monoxide, carbon dioxide, and mixtures thereof into a reaction zone of a reactor, and converting the feed stream into a product stream comprising C2 to C5 hydrocarbons in the presence of a shaped mixed catalyst in the reaction zone. The shaped mixed catalyst comprises a metal oxide catalyst component comprising nickel oxide, gallium oxide, and zirconium oxide; a microporous catalyst component is a molecular sieve having 8-MR (member ring) pore openings; and wherein the mixed catalyst is reduced in a hydrogen-containing atmosphere at a temperature of 450°C to 750°C.

This invention relates to the field of alloy materials and discloses a method for preparing copper-chromium alloys by recycling copper-chromium alloy waste, comprising: 1) degreasing: immersing the copper-chromium alloy waste in an organic solvent to remove oil, cleaning, and drying; 2) embrittlement: placing the copper-chromium alloy waste in a hydrogen atmosphere, heating to above 500°C for at least 1 hour to embrittle, and then cooling; 3) cryogenic crushing: ball milling the copper-chromium alloy waste in liquid nitrogen medium to obtain copper-chromium alloy powder; 4) molding and pre-sintering: molding and pre-sintering the copper-chromium alloy powder to obtain a sintered blank; 5) densification: densifying and sintering the sintered blank to obtain a copper-chromium alloy. This invention sequentially processes copper-chromium alloy waste through degreasing, embrittlement, cryogenic crushing, molding and pre-sintering, and densification to obtain a copper-chromium alloy with high purity, high electrical conductivity, and high strength, achieving efficient recycling and reuse of copper-chromium alloy waste.

The application discloses a preparation method of a key intermediate of dapagliflozin, and belongs to the technical field of preparation of medical intermediates. The preparation method of the key intermediate of dapagliflozin comprises the following steps: 1, 1-ethoxy-4-methylbenzene is prepared by using p-cresol, sodium hydroxide and diethyl sulfate; 2, (4-ethoxybenzyl) phenyl sulfide is prepared by using 1-ethoxy-4-methylbenzene, thiophenol, a palladium catalyst, an alkali and an oxidant; 3, 1-benzyl-4-ethoxybenzene is prepared by using (4-ethoxybenzyl) phenyl sulfide under a hydrogen atmosphere; 4, 4-ethoxy-2'-chlorobenzhydrol is prepared by carrying out chlorination reaction on 1-benzyl-4-ethoxybenzene; and 5, 5-bromo-2-chloro-4'-ethoxybenzhydrol is prepared by carrying out bromination reaction on 4-ethoxy-2'-chlorobenzhydrol. The yield and purity of 5-bromo-2-chloro-4'-ethoxybenzhydrol prepared by the method are higher, the process is safer, and the production cost is reduced.

The application belongs to the technical field of molecular sieve catalytic material preparation, and particularly relates to a method for preparing a zinc-modified HZSM-5 molecular sieve catalyst by a double-bed in-situ reduction method and application thereof. The application forms a double-bed structure by loading ZnO and HZSM-5 molecular sieves in the same reaction tube respectively, and performs in-situ reduction treatment under a hydrogen-containing atmosphere, so that zinc species acts on the HZSM-5 molecular sieve in a mode different from traditional ion exchange methods and impregnation methods, thereby obtaining a zinc-modified HZSM-5 molecular sieve catalyst. The method is clear in steps and simple in operation, and can be used for adjusting the structural properties, acid characteristics and catalytic performance in a methanol-to-aromatics reaction of the HZSM-5 molecular sieve.

The application relates to the technical field of organic silicon synthesis, and particularly discloses a high-selectivity platinum catalyst and a vinyl double-seal head synthesis method. The high-selectivity platinum catalyst comprises a carrier and a platinum active component loaded on the carrier, the platinum active component is obtained by reducing and activating a platinum precursor and a ligand under a hydrogen atmosphere at 250-350 DEG C after coordination modification, and the molar ratio of the ligand to the platinum element in the platinum precursor is 2-3:1. In the application, the platinum active component is obtained by reducing and activating the platinum precursor and the ligand after coordination modification, and the ligand and the platinum element form a specific coordination structure of the platinum active center, guide the direct silicon-hydrogen addition reaction of acetylene and a hydrogen-containing double-seal head, thus the dimethyl chlorosilane intermediate is not needed, the process flow is simplified, and the effects of improving the reaction yield, environmental protection and process economy are achieved.

The application discloses a method for preparing gamma-valerolactone by catalyzing acetylpicoline acid hydrogenation with molybdenum selenide, and aims to solve the problems of low catalytic efficiency and harsh reaction conditions of existing non-noble metal catalyst systems. The method comprises the following steps: placing molybdenum selenide catalyst, acetylpicoline acid and a solvent as raw materials in a high-pressure reaction kettle, replacing the air in the high-pressure reaction kettle with hydrogen gas at room temperature for multiple times, then continuously feeding hydrogen gas until the pressure in the high-pressure reaction kettle reaches 0.5-3.0 MPa, magnetically stirring the reaction under the pressure range, at a temperature of 100-200 DEG C and in a hydrogen atmosphere, and then cooling to room temperature, so as to obtain gamma-valerolactone. The catalyst used in the application is prepared under hydrothermal conditions, and due to the sheet morphology of the molybdenum selenide catalyst, rich edge active sites are presented, so that the conversion rate of acetylpicoline acid and the selectivity of gamma-valerolactone can reach 100% under mild reaction conditions.

The application discloses a rhodium-catalyzed desymmetrization hydroformylation method for constructing polychiral center carbon ring nucleosides. The method for constructing polychiral center carbon ring nucleosides comprises the following steps: under the condition of an inert atmosphere, an acetylacetone dicarbonyl rhodium metal precursor and a chiral ligand are added into an organic solvent to prepare a catalyst solution, the catalyst solution is mixed with a substrate, and a reaction is carried out under the condition of a hydrogen atmosphere and a carbon monoxide atmosphere; after the reaction is completed, filtration and purification are carried out, and polychiral center cycloalkyl aldehyde is obtained; and the aldehyde group is converted to obtain the polychiral center carbon ring nucleosides. The method for constructing polychiral center carbon ring nucleosides has the advantages of high selectivity, wide substrate compatibility, high reaction efficiency, easy conversion of products, and the like. The whole reaction process can obtain polychiral center cycloalkyl aldehyde in one step with extremely high enantioselectivity and diastereoselectivity, the aldehyde group is converted, polychiral center carbon rings can be obtained with high yield, high dr value and high ee value, and the method is simple and easy to operate.

The application discloses a method for driving metal hydride reversible hydrogen storage by light. The method comprises the following steps: (1) introducing non-active gas into a sealed transparent reactor containing metal hydride powder; (2) applying light to the reactor to remove hydrogen and obtain a dehydrogenation product; (3) hydrogenating the dehydrogenation product in a hydrogen atmosphere to obtain the metal hydride; wherein the metal hydride is selected from at least one of alkali metal hydride, alkaline earth metal hydride and rare earth metal hydride; and the valence of hydrogen in the metal hydride is -1. In the application, the metal hydride can be directly driven by light energy, has high reactivity, and can realize reversible dehydrogenation cycle at normal temperature by using specific hydride, so that the process is simple and suitable for large-scale production.

This invention discloses a photothermal catalyst based on Ni supported on porous carbon derived from tea residue and its application in hydrogen production from waste natural biomass. The catalyst preparation method includes tea residue raw material pretreatment, preparation of tea residue-derived carbon materials, KOH chemical activation, acid washing and water washing followed by drying, then impregnation and loading with a nickel precursor, and finally reduction in a hydrogen atmosphere to obtain the catalyst. This catalyst can catalyze the biomass steam reforming hydrogen production reaction under focused sunlight irradiation. This invention organically couples the resource utilization of tea residue solid waste with the solar photothermal-driven biomass reforming hydrogen production process, achieving synergistic effects of high-value utilization of agricultural and forestry waste and clean solar hydrogen production. The process is simple, the raw materials are readily available, and it is environmentally friendly, possessing good prospects for industrial application.

This application discloses a method for the conversion of C4-C6 alkanes. In a reactor, a raw material containing hydrogen and C4-C6 alkanes is contacted with a catalyst and reacted to obtain a product containing small molecule hydrocarbons; the C4-C6 alkanes are selected from at least one of n-butane, isobutane, n-pentane, isopentane, and 2,3-dimethylbutane; the small molecule hydrocarbons are selected from at least one of ethane, propane, n-butane, and n-pentane; the catalyst is prepared by the following steps: (1) mixing clay and sol, spray drying to obtain microspheres with a diameter of 1-50 μm; (2) immersing the microspheres in an aqueous solution containing a noble metal precursor, drying I, calcining I, and treating with a hydrogen atmosphere to obtain a catalyst precursor; (3) mixing the catalyst precursor, molecular sieve, and additives, rolling to form spheres, drying II, calcining II, and reducing to obtain the catalyst.

This invention discloses a preparation process for high-carbon ferrochrome based on plasma spheroidization technology, belonging to the field of powder metallurgy. The process involves crushing and ball milling high-carbon ferrochrome blocks to obtain pre-formed powder, adding tannic acid, urea, nickel acetate tetrahydrate, and citric acid for coating, followed by spray drying. After pre-reduction carbonization in an argon-hydrogen atmosphere, the powder is then spheroidized using a radio frequency inductively coupled plasma torch. In-situ nanostructure growth is achieved in a mixed atmosphere of argon, hydrogen, and acetylene. Nickel acetate is reduced to catalytically active elemental nickel nanoparticles under the action of hydrogen and carbon monoxide. The powder is then cooled, graded, and inertly encapsulated to obtain a high-sphericity, low-oxygen-content, high-carbon ferrochrome-based core-shell structured spherical powder. The process flow of this invention is continuous and controllable, effectively improving powder flowability, bulk density, hardness, and corrosion resistance, and is applicable to additive manufacturing, thermal spraying, and powder metallurgy forming.

The invention relates to the technical field of catalytic materials, and discloses a modified beta molecular sieve and a preparation method and application thereof, the modified beta molecular sieve comprises an alkaline earth metal type beta molecular sieve and a ruthenium element loaded on the alkaline earth metal type beta molecular sieve; the CO2 adsorption capacity of the modified beta molecular sieve, which is tested by CO2-TPD, is 1.5 to 3.5 mmol / g; after the modified beta molecular sieve is reduced for 1 hour at 500 DEG C in a hydrogen atmosphere, the Ru dispersity of the modified beta molecular sieve is 12-20% through a CO pulse adsorption test. The modified beta molecular sieve has strong alkalinity, high catalytic activity and excellent activity stability.

This invention provides a spherical TC4 alloy fine powder, its preparation method, and its application, belonging to the field of alloy material preparation technology. The preparation method of the spherical TC4 alloy fine powder includes the following steps: S1: Hydrogenation pre-crack formation, using spherical TC4 coarse powder particles as raw material, heating to 700~1000℃ in a hydrogen atmosphere, and holding at that temperature for 20~90 min; S2: Preparing spherical TC4 titanium alloy powder using radio frequency plasma hydrogen explosion; the hydrogen explosion gas includes hydrogen and inert gas; S3: After ultrasonic separation of the spherical TC4 titanium alloy powder from step S2, the spherical TC4 alloy fine powder is obtained. This achieves an integrated technical route of TC4 powder refinement and hydrogen explosion spheroidization, obtaining MIM powder with high sphericity and high flowability.

This invention relates to a method for preparing a graphene-based coated iron catalyst for the deep removal of trace amounts of acetylene and ethylene impurities from electronic-grade hydrogen chloride, belonging to the field of catalyst technology. The method involves dispersing phenolic resin and graphene quantum dots in toluene, adding allyltrimethylammonium bromide, ferrocene methylamine, and sodium ethoxide, heating and stirring the reaction, and adjusting the pH with acetic acid. Citric acid and ferric acetylacetone are then added, and the mixture is stirred. Sodium borohydride is added in two stages, and the reaction is continued with stirring to obtain a gel precursor. The gel precursor is then ultrasonically dispersed, dried, and subjected to staged heating in a nitrogen-hydrogen atmosphere to obtain the resin-based coated iron catalyst. The catalyst prepared by this invention can effectively remove trace amounts of acetylene and ethylene impurities from electronic-grade hydrogen chloride, improving the purity of electronic-grade hydrogen chloride.

The application discloses a binary metal catalyst and application thereof in efficient catalytic synthesis of diols from hemicellulose, wherein the binary metal catalyst is prepared by co-precipitation, calcination and reduction of active metal precursors and carrier precursors. The catalyst can directly convert hemicellulose into diols in one step under the action of water as a solvent and hydrogen atmosphere. The catalyst is simple in preparation and synthesis, and has high selectivity, and can hydrogenolyze part of by-products such as erythritol and tetrahydrofurfuryl alcohol into diols, thereby improving the diol yield. Meanwhile, the catalyst has excellent stability, and can overcome the problem of deactivation in the recycling process of the catalyst.

The application discloses a supported bimetallic-based two-dimensional nanometer catalytic material and a preparation method and application thereof, and relates to the technical field of catalysts. The preparation method comprises the following steps: preparing a monolayer structure or a few-layer structure of a plasmonic nanosheet; dispersing the plasmonic nanosheet in a solvent and adding a copper source to prepare a first mixed solution; stirring the first mixed solution in an inert gas environment, and then performing freeze-drying treatment and calcination treatment in a hydrogen atmosphere to prepare a nanosheet-Cu; adding HAuCl4 and HCl into the nanosheet-Cu in sequence, mixing, and then reacting under preset light irradiation conditions to prepare a supported bimetallic-based two-dimensional nanometer catalytic material nanosheet-Cu-Au. The application can realize the functional division and spatial cooperation of bimetallic active sites, promote the efficient generation, separation and directional transmission of photo-generated carriers, and thus improve the reaction efficiency and product selectivity of the co-reduction of nitrate and carbon dioxide to urea.

This invention belongs to the field of thermally conductive composite material preparation technology, specifically relating to high thermal conductivity graphene / copper composite materials, preparation methods, and derived composite materials. The preparation method includes: placing graphene oxide in pure water, subjecting it to ultrasonic treatment and mechanical stirring to obtain a uniformly dispersed graphene oxide dispersion; adding a copper salt solution to the graphene oxide dispersion in an inert gas atmosphere to obtain a mixed system; adding a reducing agent to the mixed system to reduce copper ions to copper atoms, causing copper atoms to grow orderly along the two-dimensional plane of graphene oxide, forming sheet-like copper-coated graphene oxide powder; pressing the copper-coated graphene oxide powder into a green body, placing the green body in a hydrogen atmosphere, sintering, and cooling to obtain a sintered body; and performing interface strengthening treatment on the sintered body to prepare a high thermal conductivity graphene / copper composite material. In this composite material, copper atoms are directionally and uniformly attached to the surface of graphene oxide, forming a stable composite structure.

The application relates to a method for preparing high-purity alpha-Al2O3 by hydrolysis and one-time calcination of an aluminum alloy, and belongs to the technical field of alumina preparation. Aluminum, gallium, indium and tin are used as raw materials, a melt is obtained after melting, flaky aluminum alloy is prepared, and the flaky aluminum alloy is crushed into powder and reacts with pure water, solid and hydrogen are collected respectively, and high-temperature calcination is carried out under a hydrogen atmosphere, thereby obtaining high-purity alpha-Al2O3. The activity of the aluminum is activated by preparing an aluminum-gallium-indium-tin alloy, and the broken aluminum alloy powder is used for hydrolysis reaction, so that the reaction rate is larger, the impact of hydrogen on the product is larger during the hydrolysis process, the particle size of the product is smaller, the removal of impurities in the calcination process is more favorable, the purity of the alumina obtained after the calcination is larger, and the particle size is smaller.

This invention relates to a platinum-based catalyst for the preferential oxidation of CO in a hydrogen-rich atmosphere, its preparation method, and its applications. The method, starting from an interface design perspective, employs a series of synergistic and innovative preparation steps: "selective adsorption with non-polar solvents + controlled pH in-situ anchored hydrolysis + two-step thermal treatment." This successfully solves the technical challenge of traditional methods in constructing a tight, stable, and efficient interface between platinum clusters and iron oxides. The catalyst prepared by this method exhibits high catalytic activity, excellent selectivity, and stability in the preferential oxidation of CO in a hydrogen-rich atmosphere, demonstrating outstanding technological innovation and application value.

The present application relates to a kind of microalloy copper graphene composite material preparation method, it is characterized in that, the preparation method includes the following steps: mixing polysaccharide solution and microalloy copper powder, remove solvent, obtain coated microalloy copper powder;Hydrogen atmosphere sintering the coated microalloy copper powder, obtain graphene coated microalloy copper powder;The graphene coated microalloy copper powder is subjected to hot isostatic pressing and solid solution aging, obtain the microalloy copper graphene composite material.The preparation method provided by the present application is coated by polysaccharide and organic auxiliary agent at molecular level, makes the coating layer in situ conversion into uniformly attached to the surface of microalloy copper powder few-layer graphene or high-quality carbon layer when sintering, it is favorable to obtain the microalloy copper graphene composite material with uniform composition, interface is closely combined, high density, to meet the strict requirements of high-density electronic packaging and interconnection to material performance.

This invention belongs to the field of catalytic chemical technology and discloses a method for preparing a Ni2P / SAPO-11 catalyst and its application. Ni(NO3)2·6H2O and (NH4)2HPO4 are dissolved in deionized water to obtain a mixed solution A. Citric acid is dissolved in mixed solution A and ultrasonically treated until completely dissolved to obtain an impregnation solution B. Impregnation solution B is added dropwise to a SAPO-11 support, and after aging, drying, and calcination, a catalyst precursor is obtained. The precursor is reduced under a hydrogen atmosphere to prepare the active phase, thus obtaining a CA-modified CA(x)-Ni2P / SAPO-11 catalyst, where x is the CA / Ni molar ratio. This invention, by regulating the metal-acid active center balance with citric acid, promotes the synergistic effect of bifunctional active centers, significantly improving the catalyst's ability to simultaneously perform hydrodesulfurization and hydroxyl skeletal isomerization. This invention provides a new method for preparing bifunctional catalysts with deep desulfurization and olefin skeletal isomerization activities.

This invention discloses a method for preparing permanent magnets by low-temperature orientation molding and hot-pressing densification of omnidirectional NdFeB magnetic powder, relating to the field of permanent magnet materials technology. The invention includes the following steps: Fe, B-Fe alloy, and Co are melted, and Nd, Ga, Al, and Cu are added and melted. After casting, the mixture is vacuum annealed, crushed, and treated in a hydrogen atmosphere at 300-350℃, followed by vacuum treatment at 350℃, then treatment in a hydrogen atmosphere at 800-820℃ and 80kPa, and then vacuum treatment in a constant axial static magnetic field at 800℃, 0.08-0.1Pa, and 2.2-2.5T. After discharge, the material is pretreated with a dilute nitric acid aqueous solution, then modified with a modified suspension and modified nanosheet dispersion, and finally subjected to warm pressing, vacuum degreasing, and hot pressing to obtain an omnidirectional NdFeB permanent magnet with excellent remanence, intrinsic coercivity, maximum energy product, and squareness.

This invention relates to a method for manufacturing an SOI structure, comprising the following steps: a) providing an initial substrate made of monocrystalline silicon having an interstitial oxygen content between 15 and 27 ppma according to standard ASTM'79, and a resistivity of less than 200 ohm·cm, the initial substrate being designed to form a carrier substrate for an SOI structure after undergoing a subsequent step b); b) applying a series of heat treatments to the initial substrate, wherein the initial substrate has no silicon oxide layer on at least its front side except optionally a native oxide layer, the series consisting of: - a first heat treatment defined by a isothermal range of temperatures above 1200°C and below 1280°C for a duration between 1 second and 60 seconds, a cooling ramp between 10°C / s and 70°C / s, and an argon or argon-hydrogen atmosphere, followed by - a second heat treatment in a neutral or oxidizing atmosphere defined by a isothermal range of temperatures between 900°C and 1100°C, without intermediate steps prior to this temperature, to form a carrier substrate comprising: - a stripped surface layer with a thickness greater than 40 µm and a resistivity of less than 10 ohm·cm. 8 / cm 3 The microdefect concentration (BMD); and - enriched deep layers, located below the peeled surface layer, with a concentration of 2.10. 8 / cm 3 Up to 5.10 10 / cm 3 The invention relates to the microdefect concentration (BMD) between these parameters. The invention also relates to a carrier substrate and an SOI structure including the carrier substrate.

This invention relates to the field of organic synthesis technology, specifically disclosing a method for preparing N-(2,4-diaminophenyl)-4-aminobenzamide. The method involves using N-(2,4-dinitrophenyl)-4-nitrobenzamide as a raw material, adding a catalyst, buffer salt, and water, mixing the mixture, and then purging with nitrogen gas to maintain pressure. The nitrogen gas is then replaced with hydrogen gas, and a hydrogenation reaction is carried out under a hydrogen atmosphere. After the reaction is complete, an acid is added to quench the reaction, the catalyst is removed by filtration, and then an alkali is added to adjust the pH to above 8. The mixture is then filtered to obtain crude N-(2,4-diaminophenyl)-4-aminobenzamide. The crude product is purified by recrystallization and finally dried to obtain N-(2,4-diaminophenyl)-4-aminobenzamide. The method provided by this invention has high selectivity, few side reactions, protects the amide bond from hydrolysis, and produces a product with high purity.

Disclosed in the present invention is an asymmetric catalytic hydrogenation method for a cyclohexene derivative, comprising the following steps: under a hydrogen atmosphere, the cyclohexene derivative undergoes an asymmetric hydrogenation reduction reaction in the presence of a catalyst, an acid and a solvent. The asymmetric catalytic hydrogenation method provided by the present invention achieves high conversion and excellent selectivity for a cyclohexene derivative substrate, and the resulting reduction product has a high ee value of up to 99%, and is suitable for industrial scale-up production. The method can effectively improve the production efficiency and product purity, thereby meeting the requirements of large-scale production.

The application provides a method for preparing adamantane, which comprises: isomerizing tetrahydrodicyclopentadiene in the presence of a mesoporous mordenite molecular sieve catalyst with acid sites established by an organic acid, in the presence of an optional organic solvent, and in a hydrogen-containing atmosphere; and calculating the NH3-TPD peak area of the catalyst by integration, wherein the peak area of the weak acid center of the catalyst is greater than or equal to 330, the peak area of the strong acid center of the catalyst is less than or equal to 282, and the specific surface area of the catalyst is greater than or equal to 300 m 2 / g. In the synthesis of adamantane by the method, the isomerization reaction of adamantane is carried out in the presence of the above catalyst, at a reaction temperature of 250 DEG C, a hydrogen pressure of 1 Mpa, and in a 100-ml stainless steel autoclave. The product composition is analyzed by gas chromatography, and the chromatographic column is an HP-5 capillary column with a column length of 30 m. The purity of adamantane can reach more than 99%.

This invention discloses a hydrophobic-doped carbon-coated nickel catalyst, its preparation method, and its application. The aim is to provide a catalyst that can effectively improve the hydrophobic properties of pure nickel-based catalysts and promote the further coupling of lower alcohols to higher alcohols. This catalyst exhibits excellent catalytic efficiency, high reactivity, high ethanol conversion rate, and good selectivity for C8+ higher alcohols in the one-step synthesis of higher alcohols from aqueous ethanol. The technical solution is as follows: Ni@MA and hydrophobic SiC are added to a ball mill jar at a mass ratio of 1:0.5~2 and ball-milled for 1-8 hours at 300 rpm to obtain the hydrophobic-doped carbon-coated nickel catalyst Ni@MA-SiC; further, the hydrophobic-doped carbon-coated nickel catalyst Ni@MA-SiC is obtained; the hydrophobic-doped carbon-coated nickel catalyst, alkali, ethanol, and water form a reaction system, which is reacted for 12 hours under a hydrogen atmosphere, an initial pressure of 0.1 MPa, and 230℃ to obtain higher alcohols; this invention belongs to the field of synthetic technology.

The application provides a doped carbon material and a preparation method and application thereof, and belongs to the technical field of carbon materials. The preparation method of the doped carbon material comprises the following steps: S1, a compound containing a doping element is dissolved in a solvent to form a doping element precursor solution; an organic carbon layer is coated on a substrate, and then the prepared doping element precursor solution is coated on the organic carbon layer to obtain a composite precursor; S2, the composite precursor obtained in the step S1 is calcined at 200-300 DEG C for 1-30 min in an oxygen-containing atmosphere; and S3, the product after calcination in the step S2 is calcined at a temperature of greater than or equal to 300 DEG C for 3-10 h in a hydrogen atmosphere, so that the doped carbon material is obtained. The whole process is simple in preparation, low in processing temperature, high in doping amount and uniform, effectively reduces energy consumption, and improves the preparation efficiency.

This invention belongs to the field of industrial catalysis and bioenergy conversion technology, and relates to a method for selectively cleaving C-C bonds in lignin to prepare alkanes using a Ni-Co spinel catalyst and its applications. The method of selectively cleaving C-C bonds in lignin using a Ni-Co spinel catalyst can achieve efficient C-C bond cleavage under mild conditions (250~290°C, 2-4 MPa) and a hydrogen atmosphere, without the need for excessively high temperatures and pressures. It exhibits good cleavage activity for various C-C bond types in lignin (such as α-1, 5-5′, β-1, β-β′, etc.), showing broad substrate applicability. When used to prepare cycloalkanes from o-benzylphenol, the catalytic conversion rate can reach over 99%, and the cycloalkane yield can reach over 70%. The cycloalkane yield from the catalytic cleavage of real lignin ranges from 7% to 25%. The method of this invention does not require the use of precious metals and has low cost.