445 results about "Furaldehyde" patented technology

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 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.

The invention discloses a lignin-based epoxy anticorrosive paint and a preparation method thereof. The anticorrosive paint is prepared by mixing a lignin-based epoxy anticorrosive paint component, a lignin-based phenolic amine curing agent and a diluent. According to the lignin-based epoxy anticorrosive paint disclosed by the invention, on one hand, a lignin epoxy resin acetylation modification method based on lipase is introduced, and the content of hydrophilic groups is reduced, so that formation of a compact lignin cross-linked network structure is promoted, and the barrier ability, heat resistance and aging resistance of an anticorrosive coating on a chemical medium are improved on the resin level; on the other hand, lignin and furfural are respectively used for partially replacing phenol and paraformaldehyde to prepare a lignin-based phenolic aldehyde amine curing agent with high chemical inertness, so that the protection effect of a coating in an extreme corrosion environment and the adhesive force to a metal base material are improved on the curing agent level. The lignin-based epoxy anticorrosive paint prepared by the invention has good corrosion resistance, aging resistance, thixotropy and adhesive force.

The present invention relates to a method for continuously preparing 5-amino-1-pentanol, 1-amino-2-pentanol, and 1,5-pentanediamine using furfural as a raw material. The method comprises the following steps: After hydrogen and the raw material liquid are preheated to 20-150 °C in a preheater, they are simultaneously introduced into a fixed-bed reactor equipped with two sections of catalysts, and reacted at 30-150 °C and a reaction pressure of 0.1-8 MPa to obtain 5-amino-1-pentanol, 1-amino-2-pentanol, and 1,5-pentanediamine; the first catalyst is a metal catalyst supported on graphitic carbon nitride; the active metal of the second catalyst is one, two, or more of Ru, Pt, Rh, Cu, Co, and Ni; the carrier of the second catalyst is γ-Al2O3, TiO2, SiO2, ZrO2, CeO2, ZSM-5, cerium-zirconium solid solution, or activated carbon. The present invention solves the problem of poor selectivity in the process of generating 1,5-pentanediamine, and the product distribution can be changed by changing the catalyst.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing 5-methylfurfural by using 2-methylfuran. The special solid acid catalyst is used for replacing traditional phosphorus oxychloride, hydrogen chloride and phosphorus-containing wastewater are eliminated from the source, and the sulfolane is used for replacing DMF (Dimethyl Formamide), so that solvent residues in the product are reduced. The solid catalyst SO4 < 2-> is modified to form a strong Bronsted acid site (-SO3H) which cooperates with Ce < 3 + > / Ce < 4 + > redox to inhibit carbon deposition, selectively activate 2-methylfuran alpha-C and inhibit side reactions, so that the selectivity and yield of a target product are improved. Na2CO3 neutralization is replaced by electrochemical neutralization, salt slag solid waste is eliminated, and environmental pollution is reduced. After the organic phase is dried and dewatered through a molecular sieve, most of the solvent is removed through rotary evaporation, and the residual crude product is subjected to centrifugal molecular distillation, so that unreacted raw materials and trace impurities are effectively removed, and the product purity is remarkably improved.

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 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 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 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 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 relates to the technical field of chemical synthesis, and discloses a method for preparing 2, 5-furandicarboxylic acid, which comprises the following steps: dispersing cobalt nitrate and nickel sulfate into an aqueous solution of polyvinylpyrrolidone at room temperature; adding a sodium borohydride solution to obtain nano colloid; preparing an aqueous suspension of cerium oxide, and adding the aqueous suspension into the nano colloid; centrifugally filtering, and recovering a solid product; washing the solid product; centrifuging, putting solid powder obtained after centrifuging into a drying oven, and drying; and calcining and grinding the solid powder to finally prepare the Co-Ni / CeO2 catalyst. And dissolving 5-hydroxymethylfurfural in water at normal temperature, adding the prepared Co-Ni / CeO2 catalyst and a sodium hypochlorite solution, reacting, and filtering to remove the catalyst, thereby obtaining the 2, 5-furandicarboxylic acid. The method disclosed by the invention has the advantages of no use of strong base, low reaction temperature, short reaction time, few byproducts, greenness and sustainability.

The invention provides a preparation method of a hydrotalcite-derived cobalt-copper catalyst and application of the hydrotalcite-derived cobalt-copper catalyst in furfural hydrogenation reaction. A series of different layered composite metal oxide precursors are prepared through coprecipitation and ion exchange methods, the layered composite metal oxide precursors are applied to furfural hydrogenation reaction after being pre-reduced, and the reaction with pentanediol and furfuryl alcohol as target products shows excellent catalytic activity. By designing the element composition and structural distribution of the hydrotalcite precursor, the composition, the structure and the physical property of the catalyst are effectively modulated, and the distribution of hydrogenation products is effectively regulated and controlled. The furfural can be completely converted on the Co < 1.5 > Cu < 0.25 > Al < 0.5 > Ox catalyst, and the yield of the product pentanediol reaches 68.8%; the yield of the product furfuryl alcohol reaches 98% on the basis of the Co < 1.5 > Cu < 0.25 > Al < 1.75 > catalyst. Characterization results of the catalyst show that the hydrogenation performance of the catalyst strongly depends on sample element composition, valence states of active species Cu and Co, structural distribution and dispersity of the active species Cu and Co in a precursor and a synergistic effect among different species.

The invention provides a preparation method of a Co (OH) 2 / Ni (OH) 2 heterostructure composite material, which comprises the following steps: S1) mixing a cobalt source, urea, an etching agent and water to obtain a mixed solution; s2) mixing a carrier and the mixed solution, and performing hydrothermal reaction to obtain Co (OH) 2 loaded on the surface of the carrier; and S3) dipping the Co (OH) 2 loaded on the surface of the carrier in a nickel source solution to carry out an electrodeposition reaction to obtain the heterostructure composite material. The invention also provides a method for synthesizing 2, 5-furandicarboxylic acid from 5-hydroxymethylfurfural. When being used as a catalyst, the prepared heterostructure composite material shows excellent 5-hydroxymethylfurfural electrooxidation performance and good cycling stability; the preparation method of the composite material is simple, conditions are mild, a new way is provided for efficient electro-oxidation synthesis of the biomass-based plastic monomer 2, 5-furandicarboxylic acid, and the composite material has a wide application prospect.

The invention provides a continuous flow preparation method of a CuPd / C catalyst. The method is simple and efficient, and one-step and continuous production can be realized. The method has the core advantages that multi-phase flow is ordered, the mixing efficiency is high, reaction parameters are accurate and adjustable, the repeatability and the automation degree are remarkably superior to those of a traditional impregnation method, and the problems that the traditional method is long in time consumption, low in selectivity, high in operation dependency, uneven in mixing and the like are effectively solved. In addition, catalyst synthesis conditions are screened, and optimal preparation conditions are determined. According to the CuPd / C catalyst prepared by the method, the conversion rate of 2, 5-dimethylfuran prepared from 5-hydroxymethylfurfural can reach 100%, and the selectivity of 2, 5-dimethylfuran can reach 97.5%. Compared with a CuPd / C catalyst prepared by an impregnation method, the yield of 2, 5-dimethylfuran is improved by more than 34.5%, and is superior to most reported catalysts at present. And mechanical operation can avoid personal errors, so that the result is easier to repeat, and the production efficiency is improved.

The invention discloses application of a high-activity Zn-based catalyst Zn (at) Nx / NC in catalytic transfer hydrogenation of 5-hydroxymethylfurfural, and belongs to the technical field of catalyst preparation. The preparation method of the catalyst comprises the following steps: dissolving zinc nitrate hexahydrate and an auxiliary agent in a solvent to obtain a solution A, dissolving a template agent in the solvent to obtain a solution B, adding the solution B into the solution A under violent stirring, and continuously stirring to completely react to obtain a solid precipitate; and roasting the solid precipitate to obtain the Zn-based catalyst Zn (at) Nx / NC. The catalyst can be used for carrying out catalytic transfer hydrogenation on HMF to generate 2, 5-bis (hydroxymethyl) furan and 2, 5-dimethylfuran, C-O bonds and C = O bonds can be efficiently catalyzed, transferred and hydrocracked under mild conditions, the conversion rate of reactants is greater than 98%, and the yield of products is high. The catalyst is simple to prepare, the active metal zinc is non-noble metal, the cost is low, and the reaction activity is high.

The invention belongs to the technical field of electrochemical catalysis and efficient conversion of biomass resources, and particularly relates to a preparation method of a copper-based catalytic electrode for electro-catalysis hydrogenation of 5-hydroxymethylfurfural. The preparation method comprises the following steps: stirring Cu (NO3) 2, DMF, dopamine hydrochloride, deionized water, absolute ethyl alcohol and triethanolamine, centrifuging, washing, drying, dispersing the obtained Dopamine-Cu catalyst powder in absolute ethyl alcohol, performing ultrasonic treatment, dripping on pretreated carbon paper, and drying to obtain the Dopamine-Cu catalytic electrode. The Dopamine-Cu catalytic electrode can be used for directionally converting 5-hydroxymethylfurfural (HMF) into 2, 5-bis (hydroxymethyl) furan (DHMF) in an electrocatalytic reduction system. According to the technology, electrochemical water decomposition hydrogen production and organic hydrogenation reaction are coupled, so that a green hydrogenation path taking water as a hydrogen source is innovatively realized. In addition, the preparation process is zero in carbon emission and free of by-product pollution, and accords with the green chemical principle.

The application relates to a preparation method of PdAg nanosponge and application of the PdAg nanosponge. A certain amount of ethylene glycol is configured into an ethylene glycol aqueous solution, a certain volume of the ethylene glycol aqueous solution is added into a reaction container, then a certain amount of a Pd precursor is quickly added into the ethylene glycol aqueous solution, a certain amount of an Ag precursor is further added, the reaction system is uniformly mixed through ultrasonic, and then the reaction system is statically reacted at 20-60 DEG C for 0.5-3.0 h. After the reaction is completed, the reaction product is centrifuged, the obtained precipitate after centrifugation is washed through ultrapure water, and the PdAg nanosponge is obtained after drying. The application does not need to use a surfactant and a template agent, does not need to additionally add a reducing agent, does not need high temperature, high pressure, stirring and other reaction conditions, and can be statically reacted at 20-60 DEG C, so that the reaction condition is mild and the reaction step is simple. The prepared PdAg nanosponge has a 3D sponge-like structure and is a self-supporting catalyst, the purity is high, and the PdAg nanosponge has excellent catalytic activity and selectivity for selective hydrogenation reaction of furfural.

The invention discloses a supported porous organic polymer catalyst and application thereof in preparation of 2, 5-furandicarboxylic acid from 5-hydroxymethylfurfural, the supported porous organic polymer catalyst comprises a carrier and an active component supported on the carrier; the carrier is an aniline polymer; and the active component is a gold-palladium alloy. An amino-modified porous organic polymer loaded with a gold-palladium alloy is used as a catalyst to efficiently catalyze and oxidize 5-hydroxymethylfurfural to prepare 2, 5-furandicarboxylic acid. Compared with the method that strong oxidants such as KMnO4 and the like need to be used for metering and oxidizing HMF to obtain FDCA, the method adopts oxygen as the oxidant, so that the method is more environment-friendly and efficient; compared with the traditional heterogeneous catalysis which needs to add an alkali promoter, the method can realize catalytic oxidation under an alkali-free condition, and has the advantages of high reaction selectivity and long service life of the catalyst while ensuring high conversion rate.

The invention provides a non-noble metal alloy catalyst for double-terminal reductive amination reaction of 5-hydroxymethylfurfural and a preparation method thereof, the catalyst is expressed as M1M2M3 / M1M2M3AlOx, M1 represents a component with amination and hydrogenation potential and is one or more of Fe and Co, M2 represents a component with dehydrogenation potential and is one or more of Ni and Cu, M3 represents a metal additive component and is Zn, and M4 represents a component with hydrogenation potential and is one or more of Fe and Co. One or more of Ga; m1M2M3AlOx is used as a carrier, and is a composite metal oxide formed by carrying out topology on M1M2M3Al-LDHs (Layered Double Hydroxides); according to the catalyst, an LDHs material is used as a precursor, and a series of non-noble metal alloy catalysts composed of different elements are prepared based on element adjustability and topological transformation characteristics of LDHs. The catalyst is used for double-end reductive amination reaction of 5-hydroxymethylfurfural, has high catalytic activity and high target product selectivity, and is outstanding in catalytic performance, good in stability and easy to recover and reuse.

The invention provides a preparation method for synthesizing 5-hydroxymethylfurfural by catalyzing glucose through a phosphotungstic acid modified molecular sieve catalyst. Organic amine is adopted as a template to synthesize a silicoaluminophosphate (SAPO) molecular sieve, the SAPO molecular sieve subjected to high-temperature activation is adopted as a catalyst, the SAPO molecular sieve and phosphotungstic acid are subjected to composite roasting, a phase transfer catalyst is added into a two-phase medium of an organic solvent and water, glucose is dehydrated and converted into 5-hydroxymethylfurfural (5-HMF), the yield of the 5-HMF is 50% or above, and the selectivity of the 5-HMF exceeds 90%. After the catalyst is recycled for multiple times, the yield of 5-HMF exceeds 40%.

The application discloses a furaldehyde aqueous phase rearrangement hydrogenation catalyst, a preparation method thereof and a method for preparing cyclopentanol by catalyzing furaldehyde aqueous phase rearrangement hydrogenation, the catalyst is a silica supported metal, the metal is at least one of copper, nickel, cobalt and zinc, the metal accounts for 0.25-11% of the total weight of the catalyst, the catalyst, furaldehyde and water are added into a batch type closed high-pressure reaction kettle, and cyclopentanol is prepared by catalytic selective hydrogenation under stirring, a zinc-doped copper phyllosilicate catalyst is prepared, the catalyst does not destroy the original copper phyllosilicate phase after modification, and the catalyst acidity, especially the Lewis acid site, is obviously improved; and the modified copper phyllosilicate catalyst is uniform in particles, high in specific surface area and acidity, low in price, renewable, and has a wide industrial application prospect.

The invention belongs to the technical field of adsorption separation, and particularly relates to application of MOF-808 and / or HKUST-1 in separation of 5-hydroxymethylfurfural and impure-phase substances. According to the application, MOF-808 and / or HKUST-1 are / is used as an adsorbent, 5-hydroxymethylfurfural can be well separated from fructose, formic acid, levulinic acid and other impurities, especially HMF and LA can be separated, the selection factor reaches up to 43.8, the defect that efficient separation of the two substances is difficult to achieve in the prior art is overcome, the purity of the separated HMF is high, energy consumption is low during HMF separation, the flow rate is large, and the method is suitable for industrial production. The separation time is short.

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

The invention discloses a method for directionally regulating and controlling distribution of a 5-hydroxymethylfurfural hydrogenation product by using an activated carbon supported bimetallic catalyst, and belongs to the technical field of biomass catalytic conversion. According to the method, the activated carbon loaded bimetallic catalyst, the 5-hydroxymethylfurfural and the reaction solvent are mixed and then subjected to hydrogenation reaction, and directional regulation and control of distribution of the 5-hydroxymethylfurfural hydrogenation product are realized by controlling the reaction solvent to be a polar aprotic solvent or a polar protic solvent. The prepared activated carbon supported bimetallic catalyst can selectively catalyze 5-hydroxymethylfurfural in a polar aprotic solvent / protic solvent to synthesize a furan chemical with a high added value through hydrogenation, the 5-hydroxymethylfurfural can be efficiently catalyzed in a polar aprotic solvent system to synthesize 2, 5-furandimethanol, the selectivity can reach 97.1%, and the selectivity can reach 97.1%. And in a polar protic solvent system, hydrogenation synthesis of 2, 5-dimethylfuran from 5-hydroxymethylfurfural can be realized, and the selectivity is as high as 99.5%.