88results about How to "Improve catalytic selectivity" patented technology

The invention belongs to the technical field of pyridone ethanolamine salt synthesis, and discloses an environment-friendly pyridone ethanolamine salt preparation process which comprises the following preparation steps: enabling isononanoyl chloride and 3, 3-methyl dimethacrylate to react under the catalysis of a solid acid catalyst to prepare 3, 7, 9, 9-tetramethyl-2-decene-5-keto acid methyl ester, and enabling the 3, 7, 9, 9-tetramethyl-2-decene-5-keto acid methyl ester to react under the catalysis of a solid acid catalyst to prepare 3, 7, 9, 9-tetramethyl-2-decene-5-keto acid methyl ester. The preparation method of the solid acid catalyst comprises the following steps: S1, taking water as a solvent, adding 14-16 parts by weight of zirconium oxychloride, 1-3 parts by weight of titanium sulfate, 0.1-0.5 part by weight of chloroplatinic acid and 0.05-0.4 part by weight of cerium chloride, adjusting the pH value to 10-11, and aging to obtain a precipitate; s2, roasting the precipitate obtained in the step S1 in an air atmosphere at 500-600 DEG C to obtain a solid acid catalyst; the method has the advantages that the catalyst is easy to recycle, and the reusability is high.

The invention discloses an alumina-loaded molecular alkane dehydrogenation catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out modification treatment on alumina balls; and (2) adding the modified alumina balls into a dissolved solution of a molecular catalyst, stirring, reacting until the supernatant is colorless, filtering, and drying to obtain the alumina-loaded molecular alkane dehydrogenation catalyst. The catalyst provided by the invention is used in a process for preparing olefin through dehydrogenation of straight-chain alkane, the alkane conversion rate can reach 21% or above, the catalyst is high in catalytic efficiency, good in selectivity and easy to recover, and the activity of the recovered catalyst is still high.

The invention discloses an MOF-derived copper-based catalyst and a preparation method and application thereof.According to the MOF-derived copper-based catalyst, a Cu-MOF metal organic framework material synthesized through hydrothermal reactions in different modes serves as a sacrifice template agent, a series of copper-based catalytic materials with rich micro-mesoporous structures are prepared through high-temperature calcination, copper particles of the obtained materials are highly dispersed, the specific surface area is high, and the molecular weight is high; the size of the metal Cu can reach the nanoscale, the metal content can reach 45%, when the catalyst is used for catalyzing the methanol liquid phase reforming hydrogen production reaction, no CO or CH4 byproduct gas is generated in the whole hydrogen production process, and the stability and the service life of the catalyst are superior to those of a common copper-based metal catalyst; the invention provides an efficient and low-cost non-noble metal catalyst for medium-low temperature methanol liquid phase reforming hydrogen production, and has certain significance for the development of subsequent low temperature methanol liquid phase reforming hydrogen production catalysts.

The invention discloses a synthesis method of bisphenol A polyether, and belongs to the technical field of fine chemical synthesis. According to the synthesis method, bisphenol A is taken as an initiator, and a composite catalyst composed of carbonate, an amine compound and organic phosphine is adopted to catalyze ring-opening polymerization reaction of alkylene oxide, so that bisphenol A polyether with low hydroxyl value and light color is prepared. The problems that in the prior art, a product is prone to isomerization and decomposition under the action of a strong base catalyst, and the color and luster of the product are darkened are effectively solved.

The invention provides a preparation method of a gradient porous material loaded noble metal catalyst. The method comprises the following steps: preparing hydroxyapatite powder; the preparation method comprises the following steps: taking hydroxyapatite powder, adding absolute ethyl alcohol, performing ultrasonic dispersion to prepare a suspension, adding polyvinyl butyral, and stirring with a magnetic stirrer to uniformly disperse the polyvinyl butyral to form hydroxyapatite slurry; taking three kinds of Pt catalyst loaded polylactic acid / glycolic acid copolymer microspheres with different particle sizes, and laying the microspheres in a mold according to the particle sizes; pouring the hydroxyapatite slurry into a mold, applying a certain pressure to fill gaps of microspheres with the hydroxyapatite slurry, and completely drying; and sintering in a sintering furnace to obtain the gradient porous material loaded noble metal catalyst. According to the invention, the noble metal catalyst is loaded on the gradient porous material, and the gradient aperture structure can promote the reactants to be guided by the capillary tube and quickly transfer the mass to each active site, so that the rate and efficiency of the selective hydrogenation performance are improved.

The invention discloses a preparation method of a bifunctional catalyst for pyridine base production, which comprises the following steps: dissolving a double-template agent in deionized water according to a fixed mass ratio, dropwise adding a silicon source solution and a NaOH solution into a double-template agent solution, adding a mixed solution of a zinc source and an aluminum source, stirring at room temperature to form gel, and drying at room temperature to obtain the bifunctional catalyst for pyridine base production. Transferring the prepared gel into a high-pressure reaction kettle, pressurizing, heating to a supercritical state, treating, taking out a sample, drying in a drying box, calcining the dried sample in a muffle furnace, removing the double template agent to obtain the Zn / Al-MCM-41 catalyst with double functions, and catalyzing formaldehyde, acetaldehyde and ammonia to synthesize pyridine base by using the Zn / Al-MCM-41 catalyst. Formaldehyde, acetaldehyde and ammonia are added into a reactor according to a molar ratio, a Zn / Al-MCM-41 catalyst is added at the same time for a catalytic reaction, and the catalytic activity and selectivity are improved by using a bifunctional catalyst for the catalytic reaction.

The invention relates to the technical field of photocatalytic processes, in particular to a catalyst for preparing methanol through photocatalytic reduction of CO2 as well as a preparation method and application of the catalyst. The catalyst comprises a composite carrier and active sites dispersed on the surface or in pores of the composite carrier, the composite carrier is of a heterojunction composite structure formed by a hollow TiO2 sphere and MCN, the hollow TiO2 sphere comprises a shell layer and a spherical cavity structure located in the shell layer, the shell layer is formed by TiO2 nanoparticles, and the MCN has a mesoporous pore structure; a II-type or Z-type heterojunction interface is formed between the hollow TiO2 spheres and the MCN through physical contact and chemical action; the active sites comprise copper nano species, sulfur vacancy defects and amino groups; the copper nano species are copper nano particles or clusters, and the valence state of copper is 0 and / or + 1 valence amino is grafted on the surface of the composite carrier through an organic long chain. The catalyst provided by the invention can greatly improve the yield and selectivity of methanol prepared by photocatalytic reduction of carbon dioxide.

The invention discloses a preparation and plasma modification method of a copper-based catalytic electrode, foamy copper is used as a substrate, and after multi-step sequential preparation such as electric activation and hydrothermal treatment, the surface of the electrode is modified by a plasma method to construct a copper-based catalyst. The problem that the stability of a supported copper-based material is insufficient due to falling of an oxide layer and grain growth is effectively solved, the catalytic activity and selectivity of the material are remarkably improved, important support is provided for achievement of a dual-carbon target and promotion of a sustainable development strategy, and outstanding scientific value and wide application prospects are achieved.

The invention discloses a preparation method of a composite catalyst for synthesizing 1, 4-butynediol, and relates to the technical field of BDO synthesis, the preparation method comprises the following steps: preparing a solution A from active metal salts of copper and zirconium, preparing a solution B from active metal salts of copper, bismuth and magnesium, and dissolving a precipitator in deionized water to prepare a solution C; synchronously dropwise adding the solution A and the solution C into a buffer solution at a constant speed to form slurry D; then the solution B and the solution C are dropwise added into the slurry D synchronously at a constant speed to form slurry E, and the slurry E is continuously subjected to a reaction or a hydrothermal reaction; and aging, filtering, washing and drying after the reaction is completed to obtain the catalyst. The composite catalyst prepared by the method is large and uniform in particle size, is beneficial to solid-liquid separation, shows relatively high activity and selectivity, and is mainly applied to the field of catalytic reaction for preparing 1, 4-butynediol.

The invention provides a metal aerogel catalyst as well as a preparation method and application thereof. The metal aerogel catalyst is prepared from metal aerogel and heteroatoms doped in the metal aerogel; the metal aerogel comprises metal and a carbon material coated on the metal; optionally, the carbon material comprises N; wherein the metal is selected from one or more of Ni, Co, Mn, Cu or Fe; the heteroatom is selected from one or more of N, P, S, B or F. The activity of the catalytic material is improved by utilizing the modification of heteroatoms on the carbon material and the electron transmission property enhanced by the active metal center.

The invention discloses a planar chiral [2.2] paracyclophane alkane monophosphine ligand pEPCP as well as a preparation method and application thereof, and relates to the technical field of chemical catalysis, the planar chiral [2.2] paracyclophane alkane monophosphine ligand pEPCP is characterized by comprising a racemate or an enantiomer, and the structural formula I of the monophosphine ligand pEPCP is as follows: # imgabs0 #. Different types of ether substituents are introduced into the structure of a unique large-steric-hindrance electron-rich rigid skeleton formed by connecting two benzene rings at para-positions through two ethylidene groups, so that the electron cloud density and steric hindrance of aromatic rings directly connected with phosphine ligands are changed. In addition, the ether substituent can also be used as a weak coordination group and participates in adjusting a dihedral angle of ligand chelation. The metal, the ligand and the substrate form the most appropriate coordination environment in the catalysis process, so that the corresponding catalytic reaction has the advantages of high reaction activity, good enantioselectivity, wide substrate universal application range and the like, is particularly suitable for asymmetric coupling reaction catalyzed by transition metal, and has economic practicability and industrial application prospects.

The application discloses a polyacid zeolite imidazolate framework loaded monatomic catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the catalyst is as follows: (1) preparing a zeolite imidazolate framework material; (2) mixing the dried zeolite imidazolate framework material and a metal salt in a solvent and stirring; then adding a heteropoly acid, controlling the pH in the system to be 5-7, and performing a solvothermal reaction under the condition of 80-120 DEG C; after the reaction is completed, cooling and centrifugal separation are performed to obtain a precipitate; and (3) performing calcination treatment on the precipitate to obtain the polyacid zeolite imidazolate framework loaded monatomic catalyst. The polyacid zeolite imidazolate framework loaded monatomic catalyst prepared by the method has high catalytic activity, high selectivity and good cycle stability, and has a good application prospect in acetyl propionate esterification reaction.

The invention relates to the field of catalyst dehydrogenation, and discloses an isobutane dehydrogenation catalyst and a preparation method and application thereof.The isobutane dehydrogenation catalyst comprises a carrier and an active metal component loaded on the carrier, and the active metal component is vanadium; wherein in terms of metal elements, the content of the active metal component is 0.1-5wt% on the basis of the total weight of the catalyst; the carrier comprises a composite metal oxide and silicon dioxide; wherein the composite metal oxide is M < 1-x > Al < x > O (x + 2) / 2, x is 0.1-0.4, and M is selected from at least one of Mg, Ni and Zn. The catalyst provided by the invention is used in a reaction for preparing isobutene by dehydrogenation of isobutane, and has relatively high catalytic activity and selectivity. Moreover, the catalyst provided by the invention is easy to recover and can be repeatedly used, and compared with the traditional alumina carrier, the catalyst is not easy to coke, and the raw materials are easy to obtain, the cost is low, the preparation is simple, and the catalyst is suitable for industrial application.

This invention discloses a method for preparing a manganese-based core-shell structured denitrification catalyst for the combined removal of CO and VOCs, and its application, belonging to the field of catalyst technology. The method employs a homogeneous deposition process to introduce iron, copper, silicon, and phosphorus elements onto the surface of a manganese dioxide core, forming corresponding oxide layers to obtain the manganese-based core-shell structured denitrification catalyst. This method is simple, and the resulting catalyst exhibits sulfur resistance at lower temperatures, strong oxidation performance for carbon monoxide and volatile organic compounds, and high selectivity for nitrogen in denitrification at high temperatures. This invention shows broad promise for applications in the combined removal of multiple pollutants.

The present invention relates to the technical field of methacrylate synthesis, and specifically discloses a molecular sieve catalyst for methacrylate synthesis and a preparation method thereof. The above-mentioned catalyst preparation method includes: adding type A microporous molecular sieve to anhydrous ethanol and ultrasonically treating at room temperature for 1-2h, adding ethylenediamine, stirring at 50-70°C for 1-2h, and removing anhydrous ethanol by rotary evaporation to obtain a pre-treated molecular sieve; adding the pre-treated molecular sieve, yttrium nitrate, and tetraethyl orthosilicate to an ethanol aqueous solution and stirring evenly, adjusting the system pH value to 8-9, 80-90°C insulation for 5-10h, cooling to room temperature, washing, and vacuum drying to obtain a composite molecular sieve; calcining the composite molecular sieve at 300-500°C for 2-4h, cooling to room temperature, adding to water, adding zirconium nitrate, cesium nitrate, and graphene oxide for ultrasonic treatment for 5-10h, standing for 5-10h, 160-190°C hydrothermal reaction for 2-6h, cooling to room temperature, filtering, washing, and vacuum drying.

The application discloses a novel polyhydroxyalkanoate (PHA) polymerase (PhaC) which can efficiently polymerize the activated monomer 6-hydroxyhexanoate-CoA (6HHx-CoA) of 6-hydroxyhexanoate (6HHx). The PhaC is co-expressed with a CoA ligase AlkK, and can synthesize poly-epsilon-caprolactone (PCL) from the direct precursor sodium 6-hydroxyhexanoate in a halomonas sp. Halomonas which has deleted endogenous beta-ketothiolase (PhaA), acetoacetyl-CoA reductase (PhaB), PhaC and enoyl-CoA hydratase (FadB).

The invention relates to a preparation method of a catalyst for preparing acetyl n-propanol through catalytic oxidation of 2-methyltetrahydrofuran, and belongs to the technical field of catalyst preparation. The preparation method specifically comprises the following steps: dissolving a vanadium-containing compound serving as a main component of the catalyst and oxalic acid serving as a pore-forming agent into deionized water; heating and hydrolyzing the solution to completely evaporate water to obtain a solid; and roasting the solid in an air atmosphere to obtain the catalyst. The prepared catalyst is a catalyst for catalyzing molecular oxygen to oxidize 2-methyltetrahydrofuran to prepare acetyl n-propanol, and a new route for preparing acetyl n-propanol is realized.

The invention relates to a hydrogen peroxide production wastewater pretreatment method, and belongs to the technical field of wastewater treatment. The graphene oxide is used as a substrate material, some oxygen-containing functional groups such as hydroxyl, epoxy group and carboxyl are connected to the two-dimensional base plane of the graphene oxide, and the hydrophilicity is good. Carboxyl on graphene oxide and soluble ferric salt are subjected to a complex reaction under the high-temperature condition, the ferric salt covers the surface of the graphene oxide, graphene-loaded nano ferroferric oxide particles are synthesized, the agglomeration effect of nano ferroferric oxide can be reduced, the catalytic effect of nano ferroferric oxide is improved, the dosage of a catalyst is reduced, and the cost is reduced. In addition, a sulfonic acid-based ionic liquid is added in the process of synthesizing graphene nano ferroferric oxide, sulfonic acid groups are introduced into interlayers and the surface of graphene, and the introduction of the sulfonic acid groups increases the number of acidic active centers on the surface of the graphene, so that the catalytic activity, the selectivity and the reaction rate of the nano ferroferric oxide are improved; the catalytic oxidation effect is improved, and the wastewater treatment efficiency is improved.

The application discloses a kind of covalent organic framework materials rich in thiophene ring and its preparation method and application, belong to semiconductor photocatalytic material technical field.1,3,5-Three [2-cyano-2-(4-aminophenyl) vinyl] benzene is amine monomer, 2,5-di (thiophene-2-yl) p-benzenedialdehyde is aldehyde monomer, and the LTP-COF material rich in thiophene ring is prepared by solvothermal reaction.The material forms large size conjugated system and rich thiophene ring active site inside, visible light absorption ability is strong, photoinduced carrier separation and transport efficiency are high, and the photocatalytic production rate of hydrogen peroxide in water can be as high as 4805 μmolg ‑ 1 h ‑1 The application process condition is mild, green and environment-friendly, low in cost, easy to scale production, and the obtained material is excellent in catalytic activity, selectivity and stability, significantly better than existing covalent organic framework photocatalyst, and has important application value in the field of photocatalytic green preparation of hydrogen peroxide.

The application relates to the technical field of catalysts, in particular to a supported catalyst and a preparation method and application thereof. The supported catalyst comprises a carrier and an active component supported on the carrier; wherein the carrier is silicon-modified alumina with a B acid density of less than or equal to 2 micromoles per gram; the dispersity of the active component is greater than or equal to 20 percent; wherein the content of the carrier is 90-99.9 percent by weight and the content of the active component is 0.1-10 percent by weight based on the total weight of the supported catalyst. The supported catalyst provided by the application has high catalytic activity and selectivity; meanwhile, the method provided by the application simplifies the process flow and is convenient for industrial production.

The invention discloses a method for preparing a catalyst for preparing 1,3-propylene glycol by highly selective hydrogenation of glycidol, and the catalyst preparation method is as follows: 1) CoNi-MOF material is prepared by mixed solvent thermal crystallization reaction or M-MOF / MOx is prepared by further oxide-loaded CoNi-MOF material; 2) the material is subjected to pyrolysis treatment to obtain CoNi@C catalyst derived from CoNi-MOF or M@C / MOx catalyst derived from M-MOF / MOx. It is applied to catalyze the selective hydrogenation reaction of glycidol, the catalyst preparation method of the present invention is simple and easy to operate, low in cost, high in hydrogenation reaction conversion rate, good in product selectivity, and is applied to catalyze the selective hydrogenation reaction of glycidol to prepare 1,3-propylene glycol compounds, greatly improving the conversion rate of the substrate and the selectivity of the target product.

The invention relates to the technical field of catalysts, in particular to a palladium-nickel catalyst for synthesizing vinyl acetate and a preparation method thereof.According to the catalyst, a composite carrier of nanometer aluminum oxide and a ZSM-5 molecular sieve serves as a carrier, Pd and Ni serve as bimetallic main active components, and potassium acetate and La2O3 serve as auxiliary active components. The preparation method comprises the key steps of carrier pretreatment, step-by-step impregnation loading of active components, roasting activation in an acetic acid-containing partial pressure atmosphere and the like. A Pd-Ni system is adopted to replace a traditional expensive Pd-Au system, the cost of precious metal is remarkably reduced by 40%-50%, meanwhile, the catalytic activity, selectivity and stability of the catalyst are comprehensively improved through the synergistic effect of all the components, and the catalyst is particularly suitable for industrial production of synthesizing vinyl acetate through an ethylene gas phase method.

The invention discloses a method for high-efficiency alcoholysis of monomers from waste polyester, and belongs to the field of waste polyester recovery. The method comprises the following steps: firstly, by taking zinc acetate as a metal source and 2-methylimidazole (MI) and 2-ethylimidazole (EI) as organic ligands, coprecipitating at room temperature to form an MOFs precursor, and calcining at 350 DEG C in an air atmosphere to obtain a heterogeneous catalyst with nano ZnO anchored to a nitrogen-doped carbon skeleton, and applying the heterogeneous catalyst to ethylene glycol alcoholysis of waste polyester; the highest alcoholysis effect of the catalyst can reach that the PET conversion rate is 100%, and the BHET yield is 84.9%. The heterogeneous catalyst prepared by the invention has the advantages of high catalytic efficiency, simple preparation, green process and the like, is easy to filter and recover, solves the problems of difficult separation of metal salt, few active sites of metal oxide, easy sintering inactivation and the like, provides a new idea for chemical closed-loop recovery of waste polyester, and has a wide market application prospect.

The application discloses a fibrous nitrogen-doped carbon metal mesh composite membrane for water treatment, which utilizes a metal mesh as a base film and a metal source, uses amino acids as a nitrogen source and a carbon source, and forms a stable nitrogen-doped carbon layer through a calcination process and uniformly distributes the nitrogen-doped carbon layer on the surface of the metal mesh. The application utilizes abundant amino and carboxyl functional groups in amino acid molecules, forms a stable chemical chelate structure with metal ions of the metal mesh base through coordination bonding, and effectively enhances the interfacial bonding strength between the nitrogen-doped carbon and the metal mesh base film in the carbonization process through the bonding mechanism at the molecular level.

The invention belongs to the technical field of catalytic conversion of natural gas, and particularly relates to a method for synthesizing methanol by continuously oxidizing methane through photo-thermal catalysis, which comprises the following steps: by taking a ZnO-loaded transition metal oxide as a catalyst and oxygen as an oxidant, continuously and efficiently oxidizing methane to synthesize methanol under normal pressure in cooperation with light energy and heat energy, the method comprises the following specific steps: step 1, loading a catalyst into a fixed bed reactor, introducing nitrogen under a normal pressure condition, and carrying out programmed heating to a reaction temperature; and 2, after the reaction temperature is stable, closing the nitrogen, introducing reaction gases CH4, O2 and H2O (g), and turning on the light source for reaction. According to the method, the methanol is synthesized by continuously and efficiently oxidizing methane under the normal-pressure condition through cooperation of light energy and heat energy, the technological process is simple, the method is suitable for continuous operation, and the catalyst is low in preparation cost, excellent in catalytic performance, high in methanol selectivity and high in industrial application value; the reaction is carried out under the normal pressure condition, so that the safety problem caused by high-pressure reaction is avoided.

The present invention provides a method for preparing a copper nanoparticle catalyst and its application. The copper metal nanocatalyst is in the form of dispersed particles. The preparation thereof comprises the following steps: heating copper salt, oleylamine and oleic acid at 20 to 60 degrees Celsius under nitrogen or other inert atmosphere, stirring and uniformly mixing, heating to 160 to 220 degrees Celsius at a certain rate for full reaction for 2 to 4 hours, obtaining a mixture of copper particles and other reaction products, cooling, centrifuging, washing and drying to obtain nanostructured copper particles. The copper nanoparticle catalyst obtained by the present invention can be applied to the electrocatalytic reaction of reducing nitric oxide to produce ammonia. Through the structural design of the catalyst copper, the nanometer size of the catalyst copper increases the specific surface area of ​​the electrode, promotes the diffusion of nitric oxide and ammonia, and achieves a high catalytic rate and single selectivity of nitric oxide to ammonia.

The invention belongs to the technical field of polyurethane synthesis, and particularly relates to a catalyst for synthesizing hard polyurethane and a preparation method of the catalyst. According to the catalyst, bismuth iso-octoate is taken as a matrix, hydroxypropyl methyl cellulose is firstly adsorbed on the surface of bismuth iso-octoate, and then 2-aminoterephthalic acid and bismuth iso-octoate are complexed at a certain temperature, so that the bismuth iso-octoate can better exert catalytic activity and selectivity, and the generation of byproducts is inhibited; furthermore, a polyurethane product has excellent mechanical properties, and the catalyst is more suitable for preparing a hard polyurethane material.

This invention belongs to the field of fluorochemical technology, specifically relating to a method for preparing cis-1,1,1,4,4,4-hexafluoro-2-butene. The method includes the following steps: I. Reacting 3,3,3-trifluoropropylene with carbon tetrachloride under light irradiation, optionally in the presence of a first catalyst, to obtain 1,1,1,3-tetrachloro-4,4,4-trifluorobutane; II. Reacting the obtained 1,1,1,3-tetrachloro-4,4,4-trifluorobutane with hydrogen fluoride in the presence of a second catalyst to obtain cis-1,1,1,4,4,4-hexafluoro-2-butene. The first step of this method uses a light-driven addition reaction, and the photocatalytic approach significantly reduces production costs. It can also be combined with a dedicated catalyst to improve reaction efficiency. The second step, the fluorination reaction, is adapted to a specific catalyst, which can effectively improve the conversion rate of the reactants and the selectivity of the target product, ensuring the overall high efficiency of the preparation process.

The invention provides a method for preparing sorbitol by hydrogenating glucose, and belongs to the technical field of sorbitol. The method comprises preparing a catalyst carrier, loading, reducing and hydrogenating reactions. The preparing the catalyst carrier comprises the steps of acid washing of carbon nanotubes, ammoniation of carbon nanotubes and stabilization. The stabilization step comprises the steps of adding a hydrochloric acid solution into a reaction container, then adding aminated carbon nanotubes and beta-cyclodextrin, stirring evenly, and performing a stirring reaction once. After the first stirring reaction, dialdehyde cellulose is added, the temperature is raised to 88-92°C at a rate of 0.4-0.6°C / min, ultrasonic treatment is performed, a second stirring reaction is performed after the ultrasonic treatment ends, a 7.8-8.2wt% sodium hydroxide solution is added after the second stirring reaction ends, the pH value is adjusted to 11.3-11.6, stirring is continued for 1.4-1.7h, and after the stirring ends, filtering, washing and drying are performed to obtain the catalyst carrier. The method for preparing sorbitol by hydrogenating glucose of the invention has high glucose conversion rate and sorbitol yield, and excellent catalyst recovery and application performance.

This invention discloses a Pd nanodendritic structure, its preparation method, and its application. The preparation method includes cutting a glass slide into cubes and washing it; dissolving 1-butylpyridine chloride in chloroform solution, then adding 1-naphthol, and dissolving to prepare a chloroform mixture as the oil phase in the reaction system; preparing a precursor solution as the aqueous phase in the reaction system; placing the glass slide in a cylindrical vial for later use; adding the chloroform mixture to the vial, then adding the precursor solution to form an oil-water two-phase reaction system, and allowing the reaction to stand; extracting the organic phase, transferring the product onto the glass slide, then extracting the aqueous solution, loading the obtained product onto the glass slide, washing and drying it to prepare a Pd nanodendritic structure loaded on a glass slide. The catalyst prepared by this invention through a simple and efficient oil-water interface synthesis method exhibits excellent catalytic activity and selectivity in the selective hydrogenation of p-nitrobenzaldehyde to p-aminobenzaldehyde.