583 results about "Hydroxymethylfurfural" patented technology

The invention relates to the field of wear-resistant fabrics, and discloses a high-strength wear-resistant fabric and a preparation method thereof.The high-strength wear-resistant fabric comprises a surface coating and a base cloth layer, the surface coating and the base cloth layer are formed by coating and drying modified waterborne polyurethane emulsion, and the modified waterborne polyurethane emulsion comprises isophorone diisocyanate, ethylene glycol terephthalate, 2, 3, 4-trimethyl-1, 3-pentanediol monoisobutyrate, polyisobutylene glycol monoisobutyrate, according to the present invention, 2, 2-dimethylolpropionic acid, a modified additive, a flame retardant modifier, 1, 4-butanediol, trimethylolpropane and the like are adopted to prepare the modified additive, dopamine is subjected to in-situ auto-polymerization on the surface of a titanium dioxide nanotube, nano-silica is grown on the surface in situ, and modification is performed through a polysiloxane solution to prepare the modified titanium dioxide nanotube flame retardant; the polysiloxane solution is prepared by carrying out a reaction on methyl triethoxysilane and dihydroxyl-terminated polydimethylsiloxane; the flame-retardant modifier is prepared by reacting 2-chloro-4, 6-diamino-1, 3, 5-triazine, 5-hydroxymethylfurfural and phosphorous acid, so that the fabric is endowed with good mechanical properties and wear resistance, and the fabric has a hydrophobic surface and is excellent in flame retardance and durability.

The invention discloses a Cu-metal phthalocyanine heterojunction catalyst, a preparation method thereof and application of the Cu-metal phthalocyanine heterojunction catalyst in preparation of 2, 5-furandimethanol through electro-catalytic hydrogenation of 5-hydroxymethylfurfural. A CuO nanowire is used as a carrier, metal phthalocyanine nanoparticles are effectively loaded through the coordination effect of 3, 4-dihydroxybenzonitrile by utilizing solvothermal reaction, and then the Cu and metal phthalocyanine heterojunction catalyst is prepared through electroreduction. The preparation method is simple, the raw materials are low in price, no precious metal is used, the production cost is effectively reduced, and the industrial application prospect is good; the catalyst has excellent electro-catalytic hydrogenation performance: at room temperature and normal pressure, the selectivity of 2, 5-furandimethanol can reach 100%, the conversion rate of 5-hydroxymethylfurfural reaches 95%, and the Faraday efficiency reaches 89%.

The invention belongs to the technical field of new energy, and particularly discloses a catalyst for catalyzing conversion of glucose into 5-hydroxymethylfurfural and a preparation method of the catalyst. The method is used for solving the problem of low HMF selectivity in the process of converting glucose into HMF. The preparation method comprises the following steps: firstly, synthesizing hollow mesoporous silicon spheres in the presence of absolute ethyl alcohol by taking hexadecyl trimethyl ammonium bromide as a structure-directing agent, ammonia water for providing an alkaline environment and tetraethyl orthosilicate as a silicon source of silicon dioxide; then, filling sucrose serving as a carbon source into the hollow meso-porous silicon spheres, and carbonizing and removing silicon to obtain meso-porous carbon microspheres; and finally, dipping the mesoporous carbon microspheres in a tin tetrachloride pentahydrate solution to prepare the tin-loaded mesoporous carbon microsphere catalyst. The catalyst has a large specific surface area, an excellent pore structure and good hydrothermal stability, has two acidic sites of Lewis acid and # imgabs0 # acid at the same time, and can efficiently catalyze conversion of glucose into HMF.

The invention discloses a catalyst for catalytic synthesis of 2, 5-furandicarboxylic acid as well as a preparation method and application of the catalyst, and the preparation method of the catalyst comprises the following steps: (1) obtaining a molecular sieve modified by nitrogen species as a catalyst carrier; and (2) mixing transition metal salt with the molecular sieve modified by nitrogen species, and roasting at high temperature to obtain the transition metal oxide catalyst coated with the nitrogen modified molecular sieve. The 2, 5-furandicarboxylic acid is prepared by using 5-hydroxymethylfurfural as a raw material and using the catalyst for catalytic oxidation in a containing atmosphere, the method is simple to operate and mild in condition, the catalyst has high stability and good reusability, and the production process of the 2, 5-furandicarboxylic acid is economical and environment-friendly.

The invention discloses a cobalt-copper bimetallic nitrogen-doped carbon catalyst, which is characterized in that CoCu-coated LNC, Co and Cu nanoparticles are anchored on a nitrogen-doped carbon carrier derived from lignin. Accordingly, the inventor also establishes a corresponding preparation method, and the catalyst is prepared by taking lignin as a carrier, cobalt-copper bimetal as an active component and dicyandiamide as a nitrogen source through one-pot pyrolysis. The method has the characteristics of simple and efficient process, high catalyst stability and activity, economy, high efficiency, environmental friendliness and the like. The method is used for preparing 2, 5-furandicarboxylic acid through thermal catalytic oxidation of 5-hydroxymethylfurfural, the yield of the target product FDCA almost reaches 100%, and the application prospect is wide.

The invention discloses an electrocatalytic oxidation method for highly selectively converting 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid by using a cobalt-nickel bimetallic catalyst, and belongs to the technical field of electrochemistry. Firstly, foamed nickel is pretreated; secondly, preparing a cobalt-nickel mixed solution, synthesizing the catalyst by adopting a solvothermal method, and characterizing the catalyst; and thirdly, preparing a three-electrode system by taking the cobalt-nickel catalyst as a working electrode, a spiral platinum wire electrode as a counter electrode, a Hg / HgO electrode as a reference electrode, an alkaline solution as an electrolyte and a Nafion 117 proton membrane as a diaphragm to realize conversion. And finally, testing the stability and cyclicity of the cobalt-nickel catalyst. Under the same potential, the material has the highest current density, the maximum electrochemical active area and the optimal charge transfer rate; the self-degradation of HMF can be effectively inhibited, the electrocatalytic oxidation has lower initial potential than the oxygen evolution reaction, and the electrode cycle stability is good; the method is simple in process, mild in condition and beneficial to industrial production.

The invention discloses a method for generating 2, 5-diformyl furan through catalytic oxidation of 5-hydroxymethylfurfural based on an acidic vanadyl sulfate solution system, and belongs to the technical field of biomass conversion. The method comprises the following steps: by taking an acidic vanadyl sulfate solution as a catalyst and / or an oxidizing agent and HMF as a raw material, reacting to generate DFF; wherein the concentration of H2SO4 in the acidic vanadyl sulfate solution is 2.5 mol / L to 4.5 mol / L. According to the method disclosed by the invention, the oxidation process of 5-hydroxymethylfurfural (HMF) is innovatively and successfully expanded to an acid environment. HMF can be converted into DFF with high selectivity, the conversion rate reaches 100%, and the yield of DFF exceeds 80%.

The invention discloses a bio-based gemini quaternary ammonium salt compound as well as a preparation method and application thereof. The bio-based gemini quaternary ammonium salt compound is a compound with a structural formula as shown in a formula I, wherein R1 is selected from one of cyclohexanone, cyclopentanone, acetone, 2-octanone and 2-pentanone; r2 is selected from C4-C24 alkyl groups (except C19 and C21); x is at least one of Cl, I and Br. The bio-based gemini quaternary ammonium salt compound disclosed by the invention takes 5-hydroxymethylfurfural as a raw material, has a furan ring, a quaternary ammonium salt substituent group and a long alkyl chain in the structure and can be used as a corrosion inhibitor, and a quaternary ammonium salt functional group and an alkyl long chain are constructed in the structure and respectively serve as a hydrophilic functional group and a hydrophobic functional group, so that the biological activity of the compound is improved. When the gemini quaternary ammonium salt corrosion inhibitor is in contact with steel (metal), a protective film can be formed on the surface of the steel (metal), so that the effect of protecting the steel (metal) is achieved, the corrosion speed of the steel (metal) is slowed down, and the economic benefit is extremely high; # imgabs0 #

The invention discloses a preparation method for directly preparing 2, 5-furandicarboxaldehyde from a carbohydrate, and the preparation method comprises the following steps: reacting a mixture I containing the carbohydrate, a catalyst, an organic phase solvent and a water phase solution in an oxygen-containing atmosphere to obtain the 2, 5-furandicarboxaldehyde, the catalyst comprises a component I and a component II; the component I is selected from at least one of aluminum chloride, indium chloride and chromium chloride; and the component II is an organic hydrophobic modified manganese oxide. According to the method, a 5-hydroxymethylfurfural intermediate product generated by reaction is directly oxidized without separation to prepare 2, 5-furandicarboxaldehyde, so that side reactions such as polymerization and the like are reduced; the carbohydrates are dissolved in the water phase and cannot be catalyzed and oxidized by the hydrophobic oxidation catalyst dispersed in the organic phase to generate byproducts, and the method has the advantages of low cost, mild reaction conditions, high product yield and the like.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method and application of a humic acid-based carbon material supported bimetallic catalyst. The catalyst is prepared from 0.1 weight percent to 10 weight percent of Pt, 0.4 weight percent to 10 weight percent of second metal (Fe, Ni, Co or Mo) and 80 weight percent to 99.5 weight percent of a humic acid-based carbon material carrier. The preparation method comprises the following steps: grinding humic acid and an accelerant, roasting at high temperature to obtain a humic acid-based carbon material, and loading the second metal (Fe, Ni, Co or Mo) and Pt on the surface of the humic acid-based carbon material by a step-by-step impregnation loading method. The catalyst can efficiently catalyze hydrogenation of 5-hydroxymethylfurfural (5-HMF) in a tetrahydrofuran solvent to prepare 2, 5-dimethylfuran (2, 5-DMF). The humic acid-based carbon material is used as a carrier, the catalyst is simple in preparation process, low in cost and high in catalytic activity, efficient conversion of the biomass-based platform compound 5-HMF can be achieved under mild reaction conditions, and the catalyst has remarkable industrial application value.

A method for catalyzing selective oxidation of 5-hydroxymethylfurfural by ion-doped birnessite belongs to the field of chemical engineering, and comprises the following steps: adding an ion-doped birnessite type catalyst into a solvent, and catalyzing 5-hydroxymethylfurfural to prepare 2, 5-furandicarboxaldehyde and 2, 5-furandicarboxylic acid in the atmosphere of air or oxygen at the temperature of 25-240 DEG C, wherein the solvent is water, methanol, ethanol, acetonitrile, dichloromethane, N, N-dimethylformamide, N, N-dimethylacetamide and the like. The method is simple, few in by-products and environmentally friendly. By adopting ion-doped birnessite as the catalyst, the method has the advantages of economy, environmental protection, mild conditions, high selectivity, easiness in recovery of the catalyst and the like; the ion-doped birnessite catalyst can efficiently and highly selectively catalyze oxidation of 5-hydroxymethylfurfural to prepare 2, 5-furandicarboxaldehyde, catalytic materials are easy to separate, the production cost is low, and the ion-doped birnessite catalyst has remarkable technical and economic effects and application prospects.

The invention discloses a method for preparing 5-hydroxymethylfurfural by rapidly converting high-concentration biomass derived sugar, and belongs to the field of biomass catalytic conversion. The method comprises the following steps: mixing biomass derived sugar with a deep eutectic solvent, and carrying out closed reaction to obtain 5-hydroxymethylfurfural; the eutectic solvent comprises benzyl quaternary ammonium salt, organic acid and a cosolvent, and the organic acid is benzenesulfonic acid or organic dicarboxylic acid with 2-5 carbon atoms; the molar ratio of the benzyl quaternary ammonium salt to the organic acid to the cosolvent is (1-3): (0.5-1.5): (0-5); the concentration of the biomass derived sugar is 5 to 50 weight percent. The benzyl quaternary ammonium salt with a benzene ring is used as a hydrogen bond acceptor, the organic acid and the cosolvent are used as hydrogen bond donors to form the eutectic solvent, and a hydrogen bond network and an acid environment around the biomass derived sugar can be properly regulated and controlled by adjusting the proportion of the benzyl quaternary ammonium salt, the organic acid and the cosolvent, so that high-substrate sugar is efficiently and quickly converted into 5-hydroxymethylfurfural.

The invention provides a method for judging a processing end point of fried rice sprouts and a processing technology of the fried rice sprouts, and the method for judging the processing end point of the fried rice sprouts comprises the following steps: (1) mixing the fried rice sprouts with different frying time and an alcoholic solution, and carrying out ultrasonic extraction to obtain a series of test solution; (2) carrying out liquid chromatography detection on the series of test solutions, calculating peak area ratios of 4-coumaric acid to 5-hydroxymethylfurfural in the fried rice sprouts at different stir-frying times according to detection results, and taking a time period corresponding to a stable peak area ratio range between ratio mutation points as stir-frying time required for reaching a processing end point, and judging the processing end point of the fried rice sprouts. The method provided by the invention can objectively, accurately and clearly judge the processing end point of the fried rice sprouts, fills the blank of judgment of the processing end point of the fried rice sprouts, makes up for the situation of misjudgment caused by evaluation of the processing end point only by colors, realizes monitoring of the processing process of the fried rice sprouts, and can effectively guide the processing technology of the fried rice sprouts.

The invention discloses a preparation method of a nickel-based catalyst, which comprises the following steps: mixing an aqueous solution containing aluminum salt and nickel salt with a precipitator to obtain a Ni-Al oxide precursor; the Ni-Al oxide precursor is dried and roasted, and Ni-Al oxide is obtained; and finally, reducing to obtain the nickel-based catalyst. The invention also discloses the catalyst prepared by the method and a method for preparing 5-hydroxymethyl-2-furfuryl amine by catalyzing 5-hydroxymethylfurfural by using the catalyst. The preparation process is simple in procedure and mild in condition, and the preparation cost and time are greatly reduced. In the prepared catalyst, the Ni metal, the Ni-Al spinel and the Al2O3 phase exist stably, and the formed metal Ni has very strong capability of catalytically reducing aminated HMF in the mixed phase of the Ni-Al spinel and the Al2O3, and is not beneficial to the excessive hydrogenation reaction of an HMFA product.

The invention provides a solid acid catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: carbonizing lignin to obtain a carbon-based carrier; placing the carbon-based carrier in a plasma modification instrument, vacuumizing, and then introducing gas for activating treatment to obtain a lignin carbon-based material; and carrying out sulfonation treatment on the lignin carbon-based material to obtain the solid acid catalyst. The catalyst has the advantages of being short in preparation time, small in pollution, high in catalytic efficiency, recyclable and the like, can be applied to catalytic conversion of a fructose solution into 5-hydroxymethylfurfural, the yield can reach 70%-90%, corrosion of an inorganic acid catalyst to reaction kettle equipment is avoided due to use of the solid acid catalyst in the reaction process, and the catalyst is an environment-friendly catalyst.

The invention relates to a method for preparing 5-hydroxymethylfurfural through mild catalysis of aluminum ions. The method comprises the following steps that S1, carbohydrate and aluminum ion salt are dissolved in a solvent; s2, reacting for 24 to 48 hours in a reaction atmosphere under the condition of 80 to 120 DEG C; s3, filtering to obtain a 5-hydroxymethylfurfural sample; the mass ratio of the carbohydrate to the aluminum ion salt is 1: 1, and the mass-volume ratio of the carbohydrate to the solvent is (0.01-1g): 1mL. According to the scheme disclosed by the invention, the reaction conditions are simple and mild, the yield of the obtained 5-hydroxymethylfurfural sample can reach 99.8%, and the 5-hydroxymethylfurfural sample has the same HPLC signal as a commercially available 5-hydroxymethylfurfural standard sample and the same infrared spectrum signal as the commercially available 5-hydroxymethylfurfural standard sample; no obvious by-product peak is observed in a nuclear magnetic resonance spectrogram of a 5-hydroxymethylfurfural sample, and the product purity is extremely high. Due to high selectivity and high yield of the reaction, separation and purification of the 5-hydroxymethylfurfural are simplified, and subsequent reaction is facilitated.

The invention discloses a low-foam acidic zinc plating additive and a preparation process thereof, and belongs to the technical field of electroplating additives, the additive comprises a low-foam softening agent and a water-based brightener, and the low-foam softening agent comprises the following raw materials in percentage by mass: 0.8-1.2% of polyethyleneimine, 0.03-0.06% of monododecyl phosphate potassium, 0.2-0.6% of water-soluble polyether amine and the balance of water. The water-based brightener is prepared from the following raw materials: 0.6 to 1.2 percent of 5-hydroxymethylfurfural, 0.2 to 0.4 percent of L-cysteine salt, 0.1 to 0.15 percent of 4-amino-2 (1H) pyrimidone, 0.05 to 0.1 percent of sodium salicylate, 1 to 1.5 percent of citric acid, 0.3 to 0.5 percent of alpha-ketoglutaric acid, 0.2 to 0.4 percent of erythorbic acid and the balance of water. The water-based formula is prepared by optimizing the components in the additive, the components are uniformly dispersed, the foam amount is low, and the plating quality is good.

The invention provides a hollow cobalt phosphide catalyst for oxidation of 5-hydroxymethylfurfural and preparation of the hollow cobalt phosphide catalyst. A preparation method comprises the following steps: (1) dispersing ZIF-67 in an ethanol-water solution for reflux heating etching; and (2) carrying out low-temperature phosphorization on the ZIF-67 (at) Co (OH) 2 to obtain the hollow cobalt phosphide catalyst. The MOF-derived hollow cobalt phosphide catalyst disclosed by the invention is used for electrocatalytic oxidation of 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid, has a hollow structure, fully exposes Co sites, induces conversion to Co < 3 + > and Co < 4 + > to a greater extent, remarkably improves catalytic activity and promotes reaction kinetics. The synthesis method disclosed by the invention is simple, convenient, green and environment-friendly, solves the problem that the whole catalytic efficiency is limited due to the fact that phase change only occurs at Co sites on the surface and the interior is not fully utilized due to a compact microstructure of a traditional cobalt-based nano material, and has a good application prospect.

The invention relates to the technical field of traditional Chinese medicinal material processing, in particular to a rhizoma polygonati medicinal material and a processing method thereof.The processing method comprises the steps that the rhizoma polygonati medicinal material is subjected to root hair removal, cleaned, placed in a steamer to be steamed for 2 h in a water isolation mode, taken out, sliced and dried for 6-9 h at the temperature of 50-70 DEG C, rhizoma polygonati raw decoction pieces are obtained, vine tea extraction juice is added into the rhizoma polygonati decoction pieces according to a certain solid-to-liquid ratio, covered moistening is conducted for 8-10 h, and the rhizoma polygonati raw decoction pieces are obtained. After the ampelopsis grossedentata extracting juice is absorbed, putting the ampelopsis grossedentata extracting juice into a steamer to be steamed for 2-5 hours in a water isolation manner, taking out the ampelopsis grossedentata extracting And steaming for 3-6 times according to the steps to obtain the prepared rhizoma polygonati decoction pieces. The processing method is simple, feasible and easy to operate. By adopting the optimized process, the oxidation resistance of the prepared rhizoma polygonati decoction pieces is improved by 39.68%, the content of 5-hydroxymethylfurfural is reduced by 64.48%, the internal quality of rhizoma polygonati processed products is improved, and a new thought is provided for the rhizoma polygonati processing process.

The invention discloses 5-hydroxymethylfurfural and a preparation method thereof, and belongs to the technical field of chemical engineering. The preparation method comprises the following steps: reacting a homogeneous aqueous solution containing fructose, inorganic salt and an acid catalyst in a multi-kettle series reactor to obtain the 5-hydroxymethylfurfural, the inorganic salt is selected from at least one of halogen compounds, borides, silicate, aluminate, phosphate and borate; the acidic catalyst comprises at least one of water-soluble acids. The specific inorganic salt and the specific acid catalyst are added and can play a synergistic role, the reaction is carried out under multi-kettle series connection, the backmixing degree of the reaction materials in the reactor is maximized, side reactions can be effectively controlled, black rot is avoided, the reaction production efficiency and conversion rate are effectively improved, the reaction selectivity is improved, and the method is suitable for industrial production. And the equipment maintenance and labor cost is greatly reduced.

The invention discloses a rapid quantitative detection method for quantitative analysis of multi-components by single marker (QAM) of a pharmaceutical composition containing three-ingredient rhizoma polygonati decoction, and belongs to the technical field of detection and analysis. Specific components of the traditional Chinese medicinal materials in the medicine composition containing the three-component rhizoma polygonati decoction are quantified, three components of the three traditional Chinese medicinal materials are quantified, and determination is carried out under two detection wavelengths in a gradient elution mode. The detection wavelength is as follows: the 5-hydroxymethylfurfural is 270nm, the quercetin-3-O-gentiobioside and the isorhamnetin-3-O-gentiobioside are 330nm, the wave crests are appropriate in size, the 5-hydroxymethylfurfural, the quercetin-3-O-gentiobioside and the isorhamnetin-3-O-gentiobioside do not interfere with each other, the quantitative analysis of multiple components by one marker is realized, and the method is simple, convenient, rapid, accurate, low in cost, high in efficiency and beneficial to market supervision.

The invention discloses a ternary metal oxide catalyst for synthesizing 2, 5-furandicarboxylic acid and a preparation method of the ternary metal oxide catalyst, and the ternary metal oxide catalyst comprises an active metal A, a co-metal B and a carrier metal C. The preparation of a precursor is completed in ethanol by taking oxalic acid or citric acid and the like as a chelating agent, and then the ternary metal oxide catalyst can be obtained through high-temperature calcination. When the catalyst is applied to a reaction (FDCA) for synthesizing 2, 5-furandicarboxylic acid by using 5-hydroxymethylfurfural, an excellent effect is achieved no matter oxygen or air is used as an oxygen source, the highest yield of the FDCA reaches 92.5%, and the reaction stability is high. The non-noble metal catalyst provided by the invention is used for synthesizing 2, 5-furandicarboxylic acid, and the cost of the catalyst is remarkably reduced on the premise of keeping relatively high product yield.

The invention discloses a preparation method of a sulfonic acid type covalent organic framework material and a preparation method of 5-hydroxymethylfurfural. The material is prepared by carrying out covalent condensation reaction on a monomer containing a sulfonic acid group precursor and a connecting ligand of a skeleton through a hot solvent method, and the catalyst has the characteristics of high crystallinity, large specific surface area, ordered pore structure, high sulfonic acid group density and uniform distribution. The preparation method is simple, convenient, efficient, mild in condition and high in yield. Compared with a traditional lewis acid catalyst for preparing 5-hydroxymethylfurfural through fructose dehydration, the material has the advantages of being uniform and adjustable in porosity, higher in active site, capable of promoting fructose hydrolysis and the like, efficient conversion can be achieved, side reactions and product transition polymerization are inhibited, and better industrialization prospects are shown.

The invention belongs to the technical field of preparation of bio-based platform compounds, and discloses a method for preparing 5-hydroxymethylfurfural by photocatalysis of glucose with a composite membrane, which comprises the following steps: by taking the composite membrane as a catalyst, mixing a glucose aqueous solution and a solvent under illumination conditions, and carrying out catalytic reaction to obtain crude 5-hydroxymethylfurfural production liquid; the method is used for solving the problems of low conversion rate, more byproducts, difficulty in continuous preparation, poor water resistance, strong corrosion and the like of the synthesis of 5-hydroxymethylfurfural. According to the method, a glucose solution passes through a composite membrane assembled by a mesoporous high-entropy sulfide membrane and a microporous zeolite molecular sieve membrane in a continuous flow manner, is efficiently isomerized into fructose under the action of illumination, and is dehydrated and continuously converted into 5-hydroxymethylfurfural. The composite membrane used in the method is high in water resistance, clean and non-toxic, has double functions of reaction and separation, effectively prevents the 5-hydroxymethylfurfural from further reacting with substances such as water and the like to generate humus, and realizes high-selectivity and continuous preparation of the 5-hydroxymethylfurfural.

The invention discloses a carbon-doped carbon nitride nanotube as well as a preparation method and application thereof in photocatalytic reaction, and belongs to the technical field of inorganic photocatalytic nano materials. Comprising the following steps: roasting urea, melamine and 2, 4, 6-triaminopyridine under protective gas; adding the carbon-doped carbon nitride nanotube, 5-hydroxymethylfurfural and chloroplatinic acid hexahydrate into the deionized water; photocatalytic hydrogen evolution is started to cooperate with selective oxidation reaction of 5-hydroxymethylfurfural. The carbon-doped carbon nitride prepared by the preparation method disclosed by the invention is in a nanotube shape; and the catalyst can be effectively applied to solar photocatalytic hydrogen evolution to cooperate with selective oxidation of 5-hydroxymethylfurfural to generate 2, 5-diformyl furan. The invention mainly solves the problems that the value-added reaction cooperated with the hydrogen production process cannot be realized and the overall economic value cannot be improved in the traditional hydrogen production means. The method is an effective, practical and simple method, is suitable for laboratory preparation and industrial production, and has huge development space and application prospect.

The invention discloses a metal organic coordination porous polymer derivative catalyst for preparing 2, 5-dimethylfuran through hydrogenation of 5-hydroxymethylfurfural, and the catalyst is prepared by calcining and deriving after anchoring a metal active component by a metal organic coordination porous polymer, the metal organic coordination porous polymer is formed by coordination of one or two metals selected from cerium and zirconium and an organic carboxylic acid ligand; the metal active component is at least one of copper, nickel and cobalt. The invention discloses an application of a catalyst in preparation of 2, 5-dimethylfuran by hydrogenation of 5-hydroxymethylfurfural. According to the invention, the anchoring capability of uncoordinated carboxylic acid of an organic carboxylic acid ligand in the metal organic coordination porous polymer is utilized to stabilize the metal active component, the agglomeration phenomenon in the calcining and reaction process is obviously inhibited, and meanwhile, the mass transfer path of reactants is optimized through ordered pore channels of the metal organic coordination porous polymer. The catalyst provided by the invention improves the conversion rate of 5-hydroxymethylfurfural and the selectivity of 2, 5-dimethylfuran.

The invention discloses a method for preparing 2, 5-furandicarboxylic acid through selective catalytic oxidation of 5-hydroxymethylfurfural by using a nano-microstructured multi-metal oxide, which comprises the following steps: mixing different metal salts and an alkaline additive in a solvent, and preparing 2, 5-furandicarboxylic acid by using the characteristics of excellent dissolving capacity and diffusion performance of the solvent in a subcritical state. According to the method, metal ions are fully contacted and rapidly crystallized in subcritical fluid, the temperature and pressure in the reaction process are regulated and controlled to regulate and control the microstructure of the multi-metal oxide, so that multi-metal active sites are excited, and then roasting is performed to prepare the multi-metal oxide catalyst. And the 5-hydroxymethylfurfural can be efficiently and selectively converted into the 2, 5-furandicarboxylic acid under alkaline and aqueous solution conditions. The catalyst prepared by the method has the advantages of high dispersity, strong controllability and rapid crystallization. Compared with a noble metal catalyst, the multi-metal oxide catalyst prepared by the method disclosed by the invention is relatively low in cost, high in stability, recyclable and wide in application environment.

The invention provides a preparation method of a cuprous oxide / cobaltosic oxide heterojunction composite material. The preparation method comprises the following steps: S1) growing cobaltous hydroxide on the surface of a carrier in situ; s2) calcining the cobaltous hydroxide, so as to obtain cobaltosic oxide; and S3) carrying out electroreduction deposition on the cobaltosic oxide in a mixed solution containing a copper source and an electrolyte to obtain the cuprous oxide / cobaltosic oxide heterojunction composite material. In the reduction reaction of electro-catalysis of 5-hydroxymethylfurfural, the prepared composite material serves as a catalyst, cuprous oxide serves as a main catalytic site for catalyzing reduction of HMF into DHMF, the capacity of generating active hydrogen through water dissociation is promoted due to existence of a cobaltosic oxide substrate, and therefore the selectivity of the product DHMF is improved; meanwhile, the composite material prepared by the invention shows excellent electrochemical catalysis performance and good cycling stability, and has a great application prospect in an HMF electroreduction reaction.

The invention belongs to the technical field of fine chemical engineering, and discloses a method for preparing 2, 5-furandimethanol through hydrogenation of 5-hydroxymethylfurfural by using a metal oxide catalyst, which comprises the following steps: filling 5-hydroxymethylfurfural, a catalyst and an alcohol solvent into a reaction kettle, and carrying out closed reaction under the conditions of high temperature and inert gas to obtain the 2, 5-furandimethanol. 2, 5-furandimethanol is added; the catalyst is a zirconium oxide and copper oxide composite catalyst loaded on silicon oxide. According to the method, isopropanol is adopted as a solvent and a hydrogen donor, and 5-hydroxymethylfurfural is efficiently catalyzed under the catalytic action of the composite catalyst silicon oxide carrier loaded zirconium oxide and copper oxide, so that 2, 5-furandimethanol with higher yield can be obtained; the synthesis raw materials are simple and easy to obtain, the reaction system is simple and safe, the preparation method is simple, the preparation cost is low, the economical efficiency is high, and important practical value and wide application prospects are achieved.

The invention discloses a method for preparing 2, 5-dimethylfuran through biomass conversion. The method comprises the following steps: (1) in the presence of a plurality of organic solvents, carrying out contact reaction on a biomass raw material and a solid acid catalyst to obtain an organic solution containing 5-hydroxymethylfurfural and a 5-hydroxymethylfurfural functional group partial passivation product; (2) the organic solution obtained in the step (1), hydrogen and a hydrogenolysis catalyst are subjected to a contact reaction, and 2, 5-dimethylfuran is prepared. The method has the advantages of high product selectivity, good catalyst stability and easy product separation, and realizes green and efficient conversion from biomass to 2, 5-dimethylfuran.