132 results about "Valerolactone" patented technology

The present invention provides a polyester heat-shrinkable film containing recycled materials and a preparation method thereof, belonging to the technical field of polymer synthetic films. The raw materials of the polyester heat-shrinkable film include recycled PET polyester particles, PET polyester chips, and a modified masterbatch; the modified masterbatch is prepared from polyethylene terephthalate-1,4-cyclohexanedimethanol ester, triphenyl phosphite, polyethylene glycol block copolymer, nano-silica, and hyperbranched polyester amine; the polyethylene glycol block copolymer is prepared from polyethylene glycol and γ-valerolactone under the action of a catalyst; the hyperbranched polyester amine is prepared from trimethylolpropane, methyl crotonate, and diethylenetriamine. The product of the present invention has excellent properties such as excellent unidirectional anti-shrinkage performance and low haze.

The invention relates to the field of water-based environment-friendly ink, and discloses water-based environment-friendly mutual exclusion ink which comprises the following components: water-based polyurethane-acrylic hybrid resin; a nanocellulose crystal; modifying the plant polyphenol pigment; and gamma-valerolactone; a polyglycerol ester surfactant; a pH response type microcapsule; the invention further provides a preparation method of the water-based environment-friendly mutual-exclusion ink. The preparation method comprises the following steps: S1, preparing the nanocellulose crystal; s2, plant polyphenol pigment modification; s3, preparing a pH response type microcapsule; s4, synthesizing waterborne polyurethane-acrylic acid hybrid resin; and S5, constructing an ink system. According to the invention, a dynamic crosslinking technology of the waterborne polyurethane-acrylic hybrid resin is adopted, so that the flexibility and durability of the ink after coating are remarkably improved, the ink has better recovery capability and stronger mechanical properties, breakage or falling of the ink under stress is avoided, and the service life of the ink is prolonged.

The invention relates to the technical field of petrochemical engineering, in particular to a deep cracking and regeneration purification method of waste lubricating oil. The invention discloses a deep cracking and regeneration purification method of waste lubricating oil, which comprises the following steps: firstly, carrying out magnetic filtration on the waste lubricating oil to separate iron-based impurities, carrying out vacuum dehydration, adsorbing acidic substances by using modified diatomite and the like; secondly, cracking with a magnetic catalyst in a magnetically stabilized fluidized bed; then, carrying out counter-current extraction by using a gamma-valerolactone solution after magnetic separation; and finally, carrying out vacuum fractionation to obtain regenerated base oil. According to the method, impurities are thoroughly removed, the catalyst can be recycled, the solvent is easy to recover, solid waste can be utilized in a high-valued manner, and the yield of the base oil is high.

The application belongs to the technical field of deep eutectic solvents, and particularly relates to a ternary deep eutectic solvent and preparation and application thereof. The ternary deep eutectic solvent is composed of choline chloride, 5-sulfosalicylic acid and gamma valerolactone according to a molar ratio of 1:4:(3-25). The strong hydrogen bond network structure between the green solvent system first destroys the ester bond between lignin and hemicellulose, then cuts off the beta-O-4 bond between lignin molecules, so as to separate lignin. Meanwhile, the deep eutectic solvent can improve the stability of carbon cations due to the conjugation effect between the lone pair electrons on the heteroatom oxygen and the central carbon in the molecular structure of gamma valerolactone, so as to inhibit the condensation reaction of lignin.

The invention relates to the field of chemical synthesis, in particular to a preparation method of chlorinated alkyl polyphosphate, which comprises the following steps: mixing diethylene glycol and gamma-valerolactone, slowly adding phosphorus oxychloride, and reacting at 20-50 DEG C to generate a reaction solution containing an intermediate; adding gamma-valerolactone and an IL (at) MOFs-P catalyst into the reaction solution, slowly adding epoxypropane, and reacting at 130-150 DEG C in a nitrogen atmosphere to generate a target product mixed solution; and recovering gamma-valerolactone through distillation, centrifugally separating the catalyst, regenerating and recycling, and purifying a crude product to obtain a final product. The green solvent gamma-valerolactone is adopted and recycled, the IL-coated MOFs-P catalyst is high in activity and can be recycled, side reactions are reduced by accurately controlling reaction conditions, the product yield reaches 90% or above, the purity exceeds 98%, and the method has the advantages of being green, environmentally friendly, economical and efficient.

The invention belongs to the field of photovoltaic module recovery, and discloses a method for treating an EVA (Ethylene Vinyl Acetate) adhesive film of a decommissioned photovoltaic module by a low-temperature chemical method. The method comprises the following steps of: disassembling the decommissioned photovoltaic module and cutting the decommissioned photovoltaic module into small samples; pretreating the sample; and putting the pretreated sample into a mixed solution of gamma-valerolactone, D-limonene, polyethylene glycol, absolute ethyl alcohol, 2-methylimidazole and polydimethylsiloxane, and soaking at low temperature, so that the EVA adhesive film is swelled, the adhesive force between the EVA adhesive film and the battery piece is reduced, and the separation of the EVA adhesive film and the battery piece is realized. Treatment can be carried out at low temperature, energy consumption is remarkably reduced, and the environment-friendly requirement is met; the operation process is simple, and the treatment period is short.

The invention belongs to the technical field of synthesis of organic compounds, and particularly relates to a process for preparing fipronil and an intermediate thereof. Toxic 1, 2-dichloroethane is comprehensively replaced by bio-based gamma-valerolactone, low-toxicity cyclopentyl methyl ether is matched, and N, N-dimethylformamide necessary for the process is recycled, so that consumption is greatly reduced; the continuous processes of amination, diazotization and the like are realized through a tubular reactor, a micro-reactor and a static mixer, and separation technologies such as pervaporation membrane and vacuum distillation are combined, so that the reaction time is shortened, the solvent recovery rate is increased, and the production is promoted to be continuously transformed to green. The supported FeCl3 / SiO2-NH2 catalyst disclosed by the invention can be repeatedly used, and byproducts and tail gas can be recycled and reused. In addition, diazonium salt residues are controlled to be smaller than or equal to 0.5% through near infrared spectroscopy, citric acid is subjected to stable oxidation reaction, a purification process is combined, it is ensured that the finished product is high in purity, excellent in yield and small in batch fluctuation, and efficiency and safety are both considered.

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.

Provided is a dendritic cell activator that contains, as an active ingredient, a component derived from a natural product which has been eaten for many years and the safety of which has been empirically confirmed, and that is used for inducing or promoting an acquired immune response effective against cancer or infectious disease. Specifically provided are: a dendritic cell activator containing, as an active ingredient, 5-(3,5-dihydroxyphenyl)-y-valerolactone represented by formula (I); and a medicine, a supplement, and a food or beverage each containing the compound represented by formula (I) as an active ingredient. [The configuration of the wavy line may be either R-form or S-form.]

The invention relates to a process for the manufacturing of biobased 3-methyl-delta-valerolactone (3MdVL) and 3-methyl-1,5-pentanediol (3MPD) via one- pot hydrogenation of anhydromevalonolactone (aMVL) in the presence of a Raney- Nickel catalyst. The hydrogenation occurs without solvent at a temperature from 120ºC-180ºC, preferably at 130ºC-170ºC and a pressure between 15-30 bar, preferably at a pressure between 18 and 22 bar. The hydrogenation time may vary between 3 and 25 hours, preferably between 6 and 24 hours.

The present invention provides a method for preparing a highly transparent and highly flexible modified polylactic acid, and relates to the technical field of organic polymer compounds. A method for preparing a highly transparent and highly flexible modified polylactic acid includes the steps of preparing a PLA-co-PVL copolymer solution, purifying the PLA-co-PVL copolymer, synthesizing an ATEC-HEA complex, and obtaining a modified polylactic acid composite material; the preparation of the PLA-co-PVL copolymer solution comprises the steps of uniformly mixing L-lactide and δ-valerolactone to obtain a mixed solution, adding a catalyst and an initiator to the mixed solution, and reacting to obtain a PLA-co-PVL copolymer solution; the catalyst is Sn(Oct)2, and the initiator is 1,4-butanediol; the synthesis of the ATEC-HEA complex comprises raw materials including acetyl citrate triethyl, hydroxyethyl acrylate, p-toluenesulfonic acid, and hydroquinone; the preparation of the modified polylactic acid composite material comprises raw materials including a PLA-co-PVL solid copolymer, an ATEC-HEA complex, and an antioxidant. The modified polylactic acid of the present invention has high light transmittance and excellent flexibility.

The invention discloses a beta-ketimine type binuclear aluminum complex and a preparation method thereof. The binuclear aluminum complex can be used for catalyzing ring opening polymerization of caprolactone, lactide, glycolide, valerolactone, butyrolactone or ethylene carbonate. The invention further discloses a preparation method and application of the binuclear aluminum complex. The preparation method is simple, the reaction condition is mild, the prepared beta-ketimine type binuclear aluminum complex is used as a catalyst, the catalytic activity is high, the stability is good, the service life is long, the molecular weight distribution of the obtained polymerization product is narrow, and the beta-ketimine type binuclear aluminum complex can be well applied to the ring-opening polymerization reaction of cyclic ester.

The invention discloses a precursor solution preparation method and a perovskite solar cell preparation method. The method comprises the following steps: preparing a perovskite precursor solution by taking dimethyl sulfoxide, 2-methyltetrahydrofuran and gamma-valerolactone as solvents; and adding a perovskite material into the solvent to form a perovskite precursor solution. A full-green solvent system composed of dimethyl sulfoxide, 2-methyltetrahydrofuran and gamma-valerolactone is adopted to prepare a precursor solution, the perovskite solar cell is prepared from the precursor solution, a specific solvent combination is matched with a corresponding coating rate and regulation and control crystallization kinetics, and a uniform and compact high-quality perovskite thin film can be prepared on a large area. The device efficiency is improved.

The application relates to the field of industrial cleaning and film stripping technology, in particular to a magnetic force polishing film stripping agent and a preparation method thereof, which is prepared from the following raw materials in percentage by weight: 10-20% of environment-friendly organic solvent, 1-10% of corrosion inhibitor, 5-15% of surfactant, 5-15% of lubricant, 1-10% of organic additive, 1-5% of chelating agent, and the rest of deionized water; the environment-friendly organic solvent is composed of D-limonene and gamma-valerolactone; by adopting the above formula, the organic film layers such as acrylate and epoxy resin can be quickly softened and peeled off at normal temperature to 50 DEG C, and high temperature or ultrasonic assistance is not needed, so that energy consumption is reduced. The system does not contain strong acid and strong base, the corrosion inhibitor can form effective protection on active metals such as aluminum, magnesium and zinc, and corrosion and surface damage are avoided; the surfactant and the lubricant can synergistically improve wetting and permeability and reduce mechanical scratches; the chelating agent can stabilize metal ions and prevent redeposition; the organic additive can optimize dissolution kinetics. The overall formula is low-toxic and low-volatility, and has high film stripping efficiency and substrate compatibility.

The invention relates to a process for preparing a levulinic-acid ester or alkyl levulinate, in particular ethyl levulinate, comprising the following steps: - preparing a solution containing furfuryl alcohol, an alcohol as solvent, and hydrochloric acid as catalyst acid, - esterifying this solution at a temperature in the range of 60-100°C to form alkyl levulinate, - neutralizing the catalyst acid in the mixture thus obtained, and - separating the alkyl levulinate from the humins formed as by-products. The invention also relates to a process for preparing gamma-valerolactone (GVL) by hydrogenating the alkyl levulinate obtained or obtainable by the process.

This invention discloses a method for preparing a metal phosphide catalyst. The method involves uniformly mixing a carbon-containing precursor with a phosphorus-containing precursor solution and then drying the mixture to obtain a solid product. The solid product is then pyrolyzed under an inert atmosphere. The pyrolyzed solid product is washed and dried to obtain a phosphorus-doped carbon material. A metal salt solution is then uniformly mixed with the obtained phosphorus-doped carbon material, dried, and reduced under a hydrogen-containing gas atmosphere to obtain the metal phosphide catalyst. Thus, this invention prepares phosphorus-doped porous carbon through the pyrolysis of a carbon precursor and a phosphorus-containing precursor. This utilizes the binding effect of phosphorus functional groups with metal ions to inhibit the migration and aggregation of metal particles under high-temperature conditions, effectively preventing metal particle sintering and improving the yield of the target catalytic product.

A first aspect of the present invention relates to a method for removing a plasticizer from a polymeric material, the method comprising: (a) providing a polymeric material, the polymeric material comprising a polymer and a plasticizer, and providing a solvent comprising gamma-valerolactone; and (b) contacting the polymeric material with the solvent comprising gamma-valerolactone, thereby obtaining a liquid mixture comprising the solvent, dissolved polymer and dissolved plasticizer. In a second aspect, the invention relates to a polymer obtained or obtainable from the method according to the first aspect. A third aspect of the invention relates to a plasticizer obtained or obtainable by the method according to the first aspect. In a fourth aspect, the invention relates to the use of polymers obtained or obtainable by the method according to the first aspect for producing polymer products, and in a fifth aspect of the invention relates to the use of plasticizers obtained or obtainable by the method according to the first aspect for producing soft polymers. A sixth aspect of the invention relates to a method for further processing plasticizers comprising one or more post-treatment steps selected from the group consisting of hydrolysis, hydrogenation and transesterification.

The application discloses green cross-linked polyvinyl acetal porous powder and a preparation method and application thereof, and relates to the technical field of polymer materials. The green cross-linked polyvinyl acetal porous powder is prepared by heterogeneous cross-linking reaction of polyvinyl acetal porous powder and a bio-based cross-linking agent in a green solvent, wherein the polyvinyl acetal porous powder is prepared by acetal reaction of polyvinyl alcohol and an aldehyde compound under the action of an acid catalyst. The bio-based cross-linking agent derived from natural oil or sugar is used to replace the traditional chemical synthetic cross-linking agent, and the green solvent system of gamma-valerolactone / ethanol is used to replace the traditional volatile organic solvent, so that VOC emission and the use of toxic substances are avoided from the source, the VOC content is only 12-15 g / L, the green cross-linked polyvinyl acetal porous powder has good environmental friendliness, and meanwhile, has excellent solvent resistance and low-temperature flexibility, and can be widely applied in the fields of flexible electronic packaging materials, green powder coatings, environment-friendly adhesives and the like.

A first aspect of the present invention relates to a method for removing a plasticizer from a polymeric material, the method comprising the steps of: (a) providing a polymeric material comprising a polymer and a plasticizer, and providing a solvent comprising gamma-valerolactone; and (b) contacting the polymeric material with the solvent comprising gamma-valerolactone, thereby obtaining a liquid mixture comprising the solvent, dissolved polymer, and dissolved plasticizer. In a second aspect, the present invention relates to a polymer obtained or obtainable from the method according to the first aspect. In a third aspect, the present invention relates to a plasticizer obtained or obtainable from the method according to the first aspect. In a fourth aspect, the present invention relates to the use of a polymer obtained or obtainable by the method according to the first aspect to prepare a polymeric product. In a fifth aspect, the present invention relates to the use of a plasticizer obtained or obtainable by the method according to the first aspect to prepare a soft polymer. In a sixth aspect, the present invention relates to a method for further processing a plasticizer, the method comprising one or more post-treatment steps selected from the group consisting of hydrolysis, hydrogenation, and transesterification.

Ru-supported carbon materials having characteristic surface chemistry (Bronsted acidic phosphate groups, Lewis basic N-groups selected from the group consisting of Lewis basic pyridine N-groups, pyrrole N-groups and quaternary N-groups, and oxygen functional groups), when hydrogenating aqueous levulinic acid (0.47 M and 0.95 M) to gamma-valerolactone with near stoichiometric H2 under mild conditions (80 DEG C to 95 DEG C), the Ru-supported carbon materials having surface chemical properties (Bronsted acidic phosphate groups, Lewis basic N-groups selected from the group consisting of Lewis basic pyridine N-groups, pyrrole N-groups, and quaternary N-groups). It is proved that the catalyst shows excellent activity, selectivity and stability. The material exhibits significant stability in a fixed bed reactor under continuous flow conditions, maintaining high activity and gamma-valerolactone selectivity at 3 bar to 5 bar, 80 DEG C to 95 DEG C, and a low H2 / levulinic acid ratio (4 to 17) for an operating time of about 1250 hours. The excellent catalytic performance and stability of the multi-functional Ru catalyst is attributed to the unique surface chemistry of the carbon support that stabilizes Ru nanoparticles over surface nitrogen and oxygen deficiencies and promotes the cyclization of 4-hydroxyvalerate over the acidic phosphate sites and RuOx / RuO2 sites.

The present invention discloses a supported metal oxide catalyst with adjustable acidity and its application in catalytic synthesis of γ-valerolactone. The present invention uses TiO2 as a carrier and 10 )4·xH2O is present to load a metal oxide to prepare the supported metal oxide catalyst. The obtained catalyst can prepare γ-valerolactone by catalytic transfer hydrogenation using an organic alcohol as both a hydrogen donor and a reaction solvent, thereby having a high degree of specificity for the ketone group and not producing excessive hydrogenation products. The present invention uses a cheap and readily available supported metal oxide as a catalyst, has a simple reaction system, does not require an external hydrogen source or other solvents, and is conducive to the separation of the target product. At the same time, the reacted catalyst can be directly used in the next reaction after centrifugation and drying.

The invention discloses an aqueous electrolyte and a preparation method and application thereof, and belongs to the technical field of secondary batteries. The aqueous electrolyte comprises a lithium salt, water and an additive, and the additive is selected from at least one of gamma-valerolactone, fluorocarbonate and sulfonate; the content of the lithium salt and the water meets the condition that the concentration of a lithium salt aqueous solution formed by the lithium salt and the water is 15 mol / kg-22 mol / kg; the mass ratio of the lithium salt aqueous solution to the additive is 1: (1-5). On the basis of maintaining the advantages of high safety, low cost, environmental friendliness and the like, the electrochemical energy storage device has the advantages of high safety, high working voltage, high energy density, high capacity retention rate, longer cycle life and the like by widening an electrochemical window and restraining side reactions.

A preparation method of a rare earth-containing heterojunction catalyst material CeO2 / Sm-MOF comprises the following steps: mixing and dissolving samarium nitrate hexahydrate and H4TBAPy in a composite solvent to form a mixed solution, carrying out a hydrothermal reaction to obtain Sm-MOF, mixing and dissolving ceric ammonium nitrate and Sm-MOF in an aqueous solution of gamma-valerolactone, then adding H2O2 and triethanolamine to form a mixed solution, carrying out magnetic stirring at 45-55 DEG C for 2-3 h, and carrying out hydrothermal reaction to obtain the rare earth-containing heterojunction catalyst material CeO2 / Sm-MOF. And then carrying out hydrothermal reaction and roasting treatment. The thermal stability of Sm-MOF is improved, ceric ammonium nitrate is adopted as a Ce source, a two-step heat treatment process is combined, the binding force and distribution uniformity of CeO2 on the surface of Sm-MOF are effectively improved, the catalytic activity and cycle stability of CeO2 / Sm-MOF are improved, and the Sm-MOF / CeO2 composite material has excellent degradation efficiency on MB, RhB, ATZ, CIP and the like and has excellent cycle stability in the cycle process.

The invention discloses a catalyst for converting levulinic acid into 2-methyltetrahydrofuran and its preparation method. The preparation of bamboo-based porous adsorbent material and nickel-copper-chromium hydrotalcite is prepared separately, the nickel-copper-chromium hydrotalcite is added to the bamboo-based porous adsorbent material suspension to obtain a catalyst precursor, and the precursor is roasted under 450-550°C for 3-6h. The obtained mixed metal oxide is a catalyst. The present invention composites nickel-copper-chromium hydrotalcite and bamboo-based porous adsorbent material into a catalyst precursor. The larger specific surface area of ​​the bamboo-based porous adsorbent material is evenly distributed on the hydrotalcite, solving the problem of easy agglomeration during the application of the hydrotalcite. The precursor roasting is a catalyst, which has a larger specific surface area and a regular morphology, and its activity performance is better, making it more efficient to convert γ-valerolactone to the downstream product 2-methyltetrahydrofuran.

The invention provides a green synthesis method and application of hybrid perovskite microcrystal powder. The green synthesis method of the hybrid perovskite microcrystal powder comprises the steps that AX, PbX2 and gamma-valerolactone are subjected to a mixed reaction and then subjected to purification treatment, A comprises at least one of MA < + >, FA < + > and Cs < + >, X comprises at least one of Cl <->, Br <-> and I <->, and the purification treatment comprises gradient washing with ethyl acetate and methyl acetate. The green synthesis method disclosed by the invention shows remarkable advantages of environmental friendliness, simplicity and convenience in operation, improvement of microcrystal quality and purity, optimization potential of photoelectric properties, cost and synthesis efficiency, controllability of crystal boundaries and defects of the prepared microcrystal film, enhancement of microcrystal stability, expandability and application universality. The invention also provides the hybrid perovskite microcrystal powder and application thereof in the photovoltaic field.

The invention relates to the technical field of flame retardants, and discloses an efficient organophosphorus DI-DOPO flame retardant and a preparation method thereof.The preparation method comprises the following steps that S1, an olefinic bond-containing intermediate is prepared, specifically, allyl glycidyl ether, diethanol amine, polyethylene glycol monomethyl ether acrylate and glycerol react to obtain the olefinic bond-containing intermediate; s2, preparing a phosphorus-containing monomer: reacting the olefinic bond-containing intermediate, DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide), a sulfonic acid functionalized mesoporous molecular sieve catalyst as a catalyst, vanillin glycidyl ether as a modifier and a gamma-valerolactone solvent as a modifier to obtain a grafted and modified refined phosphorus-containing monomer; and S3, preparation of a DI-DOPO flame retardant: carrying out a reaction on a phosphorus-containing monomer, a compound of gamma-methacryloxypropyltrimethoxysilane and cardanol acrylate, a mixed solvent of ethyl acetate and ethanol, and an initiator 2, 2 '-azobis (2-methylpropionamide) dihydrochloride, so as to obtain the final efficient organic phosphorus DI-DOPO flame retardant, wherein the phosphorus-containing monomer, the compound of gamma-methacryloxypropyltrimethoxysilane and cardanol acrylate, the mixed solvent of ethyl acetate and ethanol, and the initiator 2, 2'-azobis (2-methylpropionamide) dihydrochloride are subjected to a reaction.

This invention discloses a method for the efficient catalytic hydrogenation of levulinic acid and its esters to prepare γ-valerol under mild conditions. The method uses water as the reaction solvent and a Ni3P / SBA-15 catalyst to catalyze the hydrogenation of levulinic acid and its esters in a high-pressure reactor or fixed-bed reactor under low-temperature conditions to selectively prepare γ-valerol. The Ni3P / SBA-15 catalyst is obtained by impregnating a Ni3P precursor onto SBA-15 and then reducing it in a hydrogen atmosphere. This invention offers a simple preparation method, readily available raw materials, low cost, and an environmentally friendly, pollution-free reaction process. Furthermore, the catalytic system is relatively simple, with high conversion rates of the reactants, and the γ-valerol yield can reach 100%. After 50 hours of reaction in a fixed-bed reactor, the yield of γ-valerol remains stable, indicating good catalyst stability. This method saves resources, reduces costs, and has promising prospects for industrial application.

The invention discloses a method for preparing γ-valerolactone by one-pot hydrogenolysis of D-xylose, which uses isopropyl alcohol as a reaction solvent and Pt / Hβ as a catalyst. In an autoclave, under a hydrogen atmosphere, D-xylose is used as a raw material for one-pot hydrogenolysis to prepare γ-valerolactone. The preparation process of the present invention is simple, the raw materials are easily available, the reaction time is short, the reaction process is environmentally friendly and pollution-free, and the catalytic system is relatively simple, the raw material conversion rate can reach 100%, and the γ-valerolactone yield can reach up to 52.1%. Pt / Hβ has good stability and can be recycled after simple filtration and drying, which can save resources, reduce costs, and has important application value.

The application belongs to the technical field of biomass catalytic conversion, and specifically discloses a gallium-modified dealuminized H-ZSM-5 catalyst, a preparation method and application thereof, and the method comprises the following steps: ion exchange is performed on Na-ZSM-5 molecular sieve and an ammonium salt solution; selective dealuminization is performed on NH4-ZSM-5 molecular sieve and an ammonium hexafluorosilicate solution; and the impregnation method is used to load a gallium salt solution to the dealuminized molecular sieve carrier DeAl-H-ZSM-5, so as to obtain the gallium-modified dealuminized H-ZSM-5 catalyst. The application adopts the above-mentioned gallium-modified dealuminized H-ZSM-5 catalyst, the preparation method and application thereof, and the method is characterized in that the composite strategy of purifying the base by selectively dealuminizing first and then precisely loading Ga to regulate the acidity is adopted, the prepared catalyst can efficiently catalyze the preparation of furfural from pentose in a γ-valerolactone / water system, and high conversion rate and high selectivity are realized.