83 results about "Phenylacetylene" patented technology

The application relates to a catalyst for selectively hydrogenating nitrophenylacetylene to prepare aminophenylacetylene. The Fe2O3-CeO2 / TiO2 catalyst is used, the solvent is anhydrous ethanol, the hydrogen source is hydrazine hydrate, and the nitrophenylacetylene is catalytically hydrogenated to prepare aminophenylacetylene at 80-150 DEG C. The catalyst can realize efficient hydrogenation of the nitro group in the nitrophenylacetylene, the selectivity of the aminophenylacetylene can reach 94.8% when the nitrophenylacetylene is completely converted, the selectivity of the aminophenylacetylene is basically unchanged when the reaction time is continuously prolonged, and there is no accumulation of harmful intermediates such as phenylhydroxylamine in the reaction process.

The invention discloses a method for preparing a fluorine-containing compound and its application, and relates to the technical field of perovskite material additives. The preparation method is as follows: naphthaleneboric acid, potassium carbonate and bis(triphenylphosphine)palladium chloride are added to a drying container, the container is evacuated to a vacuum state and then filled with nitrogen, phenylacetylene and nine fluoro-4-iodobutane are added to the container, dichloromethane and distilled water are then added to the container, and heated for reaction; the obtained reaction mixture is subjected to extraction and drying, separation and purification, and a fluorine-containing compound is obtained. The fluorine-containing compound prepared by the present invention has good compatibility with the perovskite material, and there will be no heterogeneous phase generation; it is applied as an additive in the perovskite material to suppress the migration and loss of ions, reduce the defect state density at the perovskite grain boundary, extend the carrier lifetime, and improve the charge transfer efficiency; it can also promote the nucleation and growth of perovskite, and improve the quality and morphology of the perovskite film.

The application belongs to the technical field of polymer materials and engineering, and discloses a preparation method of a phosphate cross-linked organic porous uranium extractant. A phenylacetylene is cross-linked with 1,4-dithioerythritol through a click chemistry reaction by using a photo-induced cross-linking method. Compared with common mercaptans, 1,4-dithioerythritol contains an adsorption group. The cross-linking reaction is carried out under the condition that the ratio is 1:3 and the light irradiation time is 1h. An organic polymer PCM with a porous structure is synthesized. After the synthesized polymer is subjected to Soxhlet extraction for 48h, the polymer is modified by phosphating with phosphorus oxychloride to prepare a porous polymer containing a phosphate group. After the synthesized polymer is subjected to Soxhlet extraction for 48h and is dried, a purple black powder P-PCM is obtained. The target polymer can be synthesized only through three steps of reactions. The polymer preparation is relatively simple under the photo-induced cross-linking, which is of great significance to improving the uranium adsorption capacity. The preparation is simple, the reaction is stable, the safety is high, and the cost is low through the click chemistry reaction.

The invention relates to a method and a catalyst for preparing amino aromatic hydrocarbon through hydrogenation of nitroaromatic hydrocarbon containing easily reduced groups such as nitrophenylacetylene. According to the method, Fe-N / C prepared by an impregnation-pyrolysis method is used as a catalyst, absolute ethyl alcohol is used as a solvent, hydrazine hydrate is used as a hydrogen source, and nitro-aromatic hydrocarbon is catalyzed to be hydrogenated at 30-100 DEG C to prepare amino-aromatic hydrocarbon. The catalyst has high activity and high selectivity on nitro hydrogenation in nitro aromatic hydrocarbon, and when the conversion rate of nitrophenylacetylene is 100%, the selectivity of aminophenylacetylene is gt; the reaction time is continuously prolonged, and the selectivity of the aminophenylacetylene is basically unchanged. For hydrogenation of other nitro aromatic hydrocarbons, the selectivity gt of amino aromatic hydrocarbons can be realized under the conversion rate of 100%; 96%.

The application discloses a kind of all-substituted pyrrole compounds, the raw material alkyne compound of the application has structural diversity with isonitrile compound, can be used to synthesize different types and structures of all-substituted pyrrole compounds;Reaction raw material diphenylacetylene and its same type substrate compared with the raw material of the reaction reported by predecessors, have the advantages of simple and easy to obtain, stable nature;All-substituted pyrrole compounds have good diversity and functional group tolerance, so it has wide application;Further modification is carried out to different substitution sites on the heterocyclic skeleton of all-substituted pyrrole compounds, and intermediates of chemical products and drug structures can be obtained;The target product of the application takes pyrrole as the key mother nucleus, while amide and other unsaturated groups are introduced on the ring, and the structure has potential pharmacological activity;Cheap transition metal nickel is used as catalyst;The yield of the application is good.

The application discloses a preparation method of high-adhesion carbon paper for fuel cells and relates to the technical field of fuel cells.The method comprises the following steps: performing cleaning treatment on carbon fibers to obtain carbon fiber precursors; performing modification treatment on the carbon fiber precursors to obtain modified carbon fibers; performing wet forming treatment on the modified carbon fibers to obtain carbon fiber base paper; placing the carbon fiber base paper in phenylacetylene to obtain carbon fiber paper precursors; performing heat preservation on the carbon fiber paper precursors to obtain carbon fiber paper; performing impregnation on the carbon fiber paper, and then performing solidification treatment and carbonization treatment to obtain the high-adhesion carbon paper for fuel cells.The preparation method simultaneously adopts polyurethane and carbon nanotubes to modify the carbon fibers, polyacetylene to modify the carbon fiber base paper and vinyltrichlorosilane to modify phenolic resin, and the high-adhesion carbon paper for fuel cells prepared by the method has high density and excellent heat conduction performance and electric conduction performance.

The application discloses a five-membered ring containing alkynyl or triazole functional group P The chiral phosphine oxide compound is obtained through Domino Heck-Sonogashira cascade reaction by taking a prochiral tertiary phosphine oxide compound containing a double ethylene group and phenylacetylene as raw materials, transition metal palladium catalyst and chiral TADDOL phosphoramidite ligand under the protection of inert gas P The chiral phosphine oxide compound has a product yield of 96% and an enantioselectivity ee value of 99%, and a diastereoselectivity dr value of greater than 20:1. The application adopts an asymmetric desymmetrization strategy, uses a Heck reaction to start and a Sonogashira reaction to end a cascade reaction, simultaneously constructs P The chiral and quaternary carbon chiral center has mild reaction conditions, simple operation and good substrate universality, provides a compound skeleton with diversity, and is successfully applied to a palladium-catalyzed asymmetric allyl substitution reaction as a chiral ligand.

The invention belongs to the technical field of chemical analysis and detection. The invention provides a platinum complex fluorescent probe as well as a preparation method and application thereof in detection of water. The chemical formula of the platinum complex fluorescent probe is C23H16ClN3Pt; the preparation method comprises the following steps: 1, under the protection of argon, mixing terpyridine, potassium tetrachloroplatinate, deionized water and dimethyl sulfoxide in a round-bottom flask, heating, stirring, carrying out reflux reaction, cooling to room temperature, adding concentrated hydrochloric acid, carrying out suction filtration to obtain a precipitate, and drying to obtain Pt-Cl; 2, Pt-Cl, phenylacetylene, cuprous iodide, N, N-dimethylformamide and triethylamine are mixed into a round-bottom flask, then argon is pumped and replaced for multiple times, after a reaction, suction filtration is conducted, precipitates are obtained, washing and drying are conducted, and the catalyst is obtained. The platinum complex fluorescent probe is applied to detection of water and has the advantages of specific selectivity, high sensitivity, wide detection concentration range and the like, so that the detection can better meet the current requirements.

The invention discloses a Pd / 3-CN polymer catalyst as well as preparation and application thereof. The preparation method of the Pd / 3-CN polymer catalyst comprises the following steps: fully mixing cyanuric chloride, 3, 5-diamino-1, 2, 4-triazole, potassium carbonate and potassium tetrachloropalladate, uniformly grinding, transferring the obtained solid powder into a hydrothermal reactor, reacting at 80-160 DEG C for 12-24 hours, washing the obtained solid, performing Soxhlet extraction, and drying to obtain the Pd / 3-CN polymer catalyst. The Pd / 3-CN polymer catalyst is obtained. The invention provides the application of the Pd / 3-CN catalyst in the reaction of preparing the styrene compound by hydrogenation of the phenylacetylene compound, and the Pd / 3-CN catalyst can realize high phenylacetylene compound conversion rate and high styrene compound selectivity within a short reaction time.

The invention relates to the technical field of batteries, in particular to a silicon-carbon composite material and a lithium ion secondary battery. The silicon-carbon composite material comprises silicon-carbon particles and an aromatic polymer coating layer on the surface, and a monomer of the silicon-carbon composite material is selected from at least one of aniline, pyrrole, thiophene, 3, 4-ethylenedioxythiophene and phenylacetylene. The silicon content of the central area of the silicon-carbon particle is higher than that of the edge area, in the cross section scanning electron microscope energy spectrum of the silicon-carbon composite material, the silicon content of the central area is x0, the silicon content of any point on the edge is x1, a is equal to x1 / x0, and 0.8 < = alt; 1; the distance from the center of the silicon-carbon particle to the edge is R, the silicon content at a position 0.5 R away from the center of the silicon-carbon particle is x2, and x2 is greater than (x1 + x0) / 2; in a small-angle XRD (X-Ray Diffraction) spectrum of the silicon-carbon composite material, a first characteristic peak exists at 4-5 degrees, and the half-peak width is 0.05-0.6 degree; comprising the silicon-carbon composite material disclosed by the invention is high in cycle retention rate and good in low-temperature performance.

The invention relates to the field of oilfield chemical industry. The invention relates to a temporary plugging agent, in particular to a temperature-resistant and compression-resistant temporary plugging agent and a preparation method and application thereof. The temperature-resistant and compression-resistant temporary plugging agent comprises the following raw material components in parts by weight: 60-80 parts of polyimide; 5-10 parts of calcium carbonate nanofibers of which the surfaces are assembled with amphiphilic block copolymers; 0.2 to 4 parts of an auxiliary agent; wherein the polyimide is prepared by taking biphenyl tetracarboxylic dianhydride, p-phenylenediamine and phenylacetylene phthalic anhydride as polymerization reaction raw materials; the amphiphilic block copolymer assembled on the surface of the calcium carbonate nanofiber is polystyrene-b-polyacrylic acid. The temperature-resistant and compression-resistant temporary plugging agent provided by the invention has excellent high temperature resistance, compression resistance and plugging capacity, can be quickly hydrolyzed and crushed after temporary plugging is finished, can realize quick plugging removal, and is suitable for a high-temperature and high-pressure mining environment with the formation temperature (use environment) of 281-295 DEG C and the formation pressure of more than or equal to 130 MPa.

This invention belongs to the field of polymer composite materials technology, specifically relating to a self-lubricating polyimide resin based on a perfluoroether bond network and carbon dot reinforcement, its preparation method, and applications. The invention involves mixing carboxyl-functionalized carbon dots, an ether-containing aromatic diamine, and a polar aprotic solvent to obtain a carbon dot-diamine pre-assembled system, which is then polymerized with a perfluoroaromatic dianhydride to obtain a linear polyamic acid solution. This linear polyamic acid solution is then reacted with a phenylacetylene-containing active end-capping agent to obtain a polyamic acid solution with a three-dimensional network structure. Finally, the polyamic acid solution with the three-dimensional network structure is cured in a protective gas atmosphere to obtain a self-lubricating polyimide resin. The self-lubricating polyimide resin provided by this invention achieves a synergistic improvement in load-bearing capacity, wear resistance, and structural stability under high temperature and high load conditions, and can be widely applied in aerospace high-temperature bearings, high-load sealing rings, wear-resistant coatings for extreme conditions, and high-temperature sliding components.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a method based on one-step in-situ synthesis of a copper cyanophenylacetylene / copper phenylacetylene (CN-PhCCu / PhCCu) homogeneous heterojunction composite photocatalyst and application. The homogeneous heterojunction composite photocatalyst with a compact interface structure is synthesized in situ in one step under a mild condition by regulating and controlling the ratio of copper cyanophenylacetylene (CN-PhCCu) to copper phenylacetylene (PhCCu). The heterojunction can effectively promote exciton dissociation and photo-induced electron delocalization, remarkably inhibit charge recombination and improve the utilization efficiency of visible light. Experiments show that the composite photocatalyst shows excellent degradation performance on various water pollutants such as diclofenac (DCF) under irradiation of visible light, and has the advantages of high degradation efficiency, wide pH application range, strong coexisting ion interference resistance and the like. The method disclosed by the invention is simple in process and mild in condition, and provides a new material and technical support for efficient visible light driven water body pollution control.

The application discloses a room-temperature phosphorescent material of a phenylacetylene node-substituted pyrene derivative and a preparation method thereof. The pyrene is used as a substrate, and phenylacetylene is selectively substituted at a node (2 position) of the pyrene. Compared with a pyrene derivative obtained by substituting phenylacetylene at an anti-node (1 position) of the pyrene, the pyrene derivative obtained by substituting phenylacetylene at the node destroys the conjugation of the substitution site, maintains the rotation freedom between the substituent and the pyrene core, thereby enhancing the spin-orbital coupling, and enabling the room-temperature phosphorescence of the pyrene derivative. The obtained room-temperature phosphorescent material has the advantages of high luminous efficiency and long lifetime.

The invention provides a modified polyether-ether-ketone resin composite material as well as a preparation method and application thereof, and belongs to the field of high-molecular polymer materials. The modified polyether-ether-ketone resin / glass fiber composite material with a continuous chemical gradient interface is prepared through the interface bonding design of the polyether-ether-ketone oligomer containing the phenylacetylene functional group, the respective plasticizing and co-extrusion composite process and the reverse gradient structure design with the hard outside and the tough inside; the composite material is used for a high-performance robot exoskeleton device, and the problems that the strength and toughness of a traditional composite material are difficult to maximize at the same time, layers of a multi-layer or gradient material are easy to strip and lose efficacy, and a high-performance complex component is tedious in preparation process and low in efficiency are solved. The composite material provided by the invention has excellent mechanical properties and anti-aging and anti-fatigue properties, shows certain heat resistance during high-temperature heating, and shows great application potential in the field of high-end medical devices.

This invention relates to a low-cost method and system for preparing PEEK materials, belonging to the field of plastics production technology. The method includes: collecting the required quantity and types of raw materials; determining the required quantity of raw materials based on the type of raw material and the required quantity; determining the required quantity of end-capping agent based on the required quantity of raw materials; selecting a type of detergent based on the type of raw materials and the required quantity; adding difluoromonomers and bisphenol monomers to an organic solvent based on the required quantity of raw materials, and adding a salt-forming agent for polymerization; adding a phenylacetylene end-capping agent based on the required quantity of end-capping agent to obtain an initial oligomer; and washing and drying the initial oligomer based on the type of detergent to obtain a self-heating crosslinkable PEEK oligomer. This invention effectively reduces the preparation cost of polyether ether ketone (PEEK).

The invention belongs to the technical field of catalysis, and discloses an oxide-nitrogen-containing intrinsic microporous polymer nano composite carrier supported palladium catalyst as well as a preparation method and application thereof. The catalyst takes an inorganic nano oxide as a matrix, nitrogen-containing intrinsic microporous macromolecules are deposited on the surface of the matrix to form a composite carrier with a dual-distribution pore structure, the inorganic oxide provides macropores, and the macromolecules provide micropores; the nitrogen-containing intrinsic microporous polymer contains a tertiary amine structural unit, and nitrogen atoms of the tertiary amine structural unit are coordinated with palladium nanoparticles, so that anchoring and high dispersion of palladium are realized. The preparation method of the catalyst comprises the following steps: firstly synthesizing a nitrogen-containing intrinsic microporous polymer, then compounding the nitrogen-containing intrinsic microporous polymer with an oxide to prepare a carrier, and finally loading a palladium precursor and performing hydrogen reduction. The catalyst shows high conversion rate, high selectivity and excellent cycle stability in styrene oxide hydrogenation, acrylonitrile hydrogenation and phenylacetylene hydrogenation reactions, the preparation process is simple and convenient, and the catalyst has a good industrial application prospect.

The invention discloses a hole transport material, a preparation method thereof and a perovskite solar cell, the hole transport material has a structure as shown in a formula 1, and the preparation method of the hole transport material comprises the following steps: S1, adding 4, 5-dichlorophthalonitrile, phenylacetylene and a catalyst into a solvent for mixing, performing a first heating reflux reaction in an inert atmosphere to obtain a product as shown in a formula 2; and S2, mixing the product as shown in the formula 2, boron trichloride and an organic solvent, and carrying out a second heating reflux reaction in an inert atmosphere to prepare the hole transport material. According to the hole transport material, subphthalocyanine is used as a core skeleton, modification is carried out through peripheral phenylacetylene groups, a pi conjugated system is remarkably expanded while the basic structure of subphthalocyanine is maintained, and therefore the photoelectric conversion efficiency of a perovskite solar cell is improved; in addition, the hole transport material is good in thermal and chemical stability and has hydrophobicity, so that the service life of the perovskite solar cell is prolonged, and the stability of the perovskite solar cell is improved.

The invention relates to the technical field of metal organic framework materials, in particular to an aluminum-based metal organic framework material, a fluorescent probe, a method and application. The molecular structure of the aluminum-based metal-organic framework material is {Al (BDC)} infinity, wherein BDC is terephthalic acid. The fluorescent probe is the metal organic framework material in which the 9, 10-diphenylethynyl anthracene and the basic red 13 are packaged. The aluminum-based metal organic framework material packaged with 9, 10-diphenylethynyl anthracene and basic red 13 can generate fluorescence, has three emission platforms, and can solve the problem of low accuracy when a single fluorescence emission peak is used as a detection signal.

The present application relates to a kind of dendritic phenylacetylene crosslinking agent and its preparation method and application.The preparation method carries out amidation reaction with dendritic active ester and amino alcohol, and generates intermediate product;Intermediate product is esterified with diacetylene benzoic acid and catalyst, and dendritic phenylacetylene crosslinking agent is generated.The present application is mainly with dendritic phenylacetylene monomer and dendritic phenylacetylene crosslinking agent, utilizes the good water-soluble and temperature sensitivity of crosslinking agent, can be realized monomer temperature sensitive aggregation under the condition of no additive, and then in situ crosslinking polymerization obtains uniform dispersion dendritic helical polyphenylacetylene micro-nano gel, the gel has dynamic regulation, and exhibits good biocompatibility, can have potential application value in the field such as biosensing, chiral drug delivery, biological tissue engineering.

The application provides a method for simultaneously synthesizing thioether compounds and nitrile compounds, and belongs to the technical field of organic synthesis; the thioamide compound, fluoride and acetonitrile are mixed, then a phenylacetylene precursor is added, so that the thioether compound and the nitrile compound are simultaneously synthesized at room temperature; the method is simple and fast, does not need transition metal catalysis, has a wide substrate range, the fluoride source used is cheap and easy to obtain, and does not cause environmental pollution; the method has the advantages of simple process, mild reaction condition, good universality and the like, and the yield of the synthesized thioether compound and nitrile compound is very high, the thioether compound and the nitrile compound can reach 98% at most, and has extremely high industrial popularization value.

The invention relates to a conjugated end group polyimide covalent organic framework material as well as a preparation method and application thereof. Two monomers including pyromellitic dianhydride and tetra (4-aminophenyl) porphyrin are used for preparing a polyamic acid covalent organic framework, 4-ethynyl aniline, 4-naphthylacetylene aniline and 4-(phenylacetylene) aniline are heated for condensation cyclization and end capping based on the polyamic acid covalent organic framework, and the conjugated end group polyimide covalent organic framework material (PI-COF) is prepared. The rich pore structure of the COF skeleton provides a rapid ion transmission channel, the transport of carriers is promoted, the electron cloud density of the COF skeleton is adjusted by the pi electron conjugation effect of the end-capping group, and a specifically distributed heterogeneous interface is constructed, so that the mobility of electrons is regulated and controlled; the material is loaded on a lithium-sulfur battery positive electrode host material to construct a confinement catalytic system, and can anchor polysulfide and catalyze the polysulfide to complete a reduced-order conversion reaction, so that the lithium-sulfur battery with high capacity and long cycle life is obtained.

The invention relates to the technical field of pharmaceutical chemical synthesis, in particular to a synthesis method of a 2, 5-diphenylfuran compound, which comprises the following steps: adding a compound 1, a compound 2, acid and a catalyst into a reactor, stirring for 4 hours under the air condition of 80 DEG C, cooling to room temperature after the reaction is finished, and carrying out reduced pressure distillation to obtain a crude product, namely the 2, 5-diphenylfuran compound. And purifying through column chromatography and thin-layer chromatography to obtain the 2, 5-diphenylfuran compound. A benzoyl sulfoxide ylide compound and a phenylacetylene compound are used as raw materials, and the 2, 5-diphenyl furan compound is synthesized through metal catalysis. The method has the advantages of simple synthesis steps, easily available raw materials, safe synthesis operation, good functional group compatibility and the like; reaction conversion is high, cost is low, and industrial production is facilitated.

The present application relates to the technical field of battery binders, in particular to a water-based binder and a preparation method therefor, and a carbon-coated aluminum foil. The water-based binder comprises a water-soluble monomer, an oil-soluble monomer, an amphiphilic monomer, a functional monomer, an initiator and a neutralizing agent, wherein the amphiphilic monomer comprises at least one of sodium vinylsulfonate, sodium styrene sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, and N-vinylpyrrolidone; and the functional monomer comprises at least one of divinylbenzene, pyrrole, phenylacetylene, and 3,4-ethylenedioxythiophene. The water-based binder of the present application is formulated by compounding the water-soluble monomer, the oil-soluble monomer, the amphiphilic monomer and the functional monomer in proportion, thereby simultaneously improving the electrical conductivity of the binder, the wettability toward conductive carbon materials and aluminum foils, the adhesion to aluminum foils, etc.; and the water-based binder makes a battery prepared therefrom exhibit a good cycling stability, and is conducive to prolonging the service life of the battery.

The invention discloses a diphenylacetylene liquid crystal compound containing a difluoroethylene terminal group and a composition of the diphenylacetylene liquid crystal compound, the structure of the liquid crystal compound is shown as a general formula I, R1 is one of alkyl and alkoxy with the carbon atom number of 1-10 and alkenyl or alkenyloxy with the carbon atom number of 2-10, and hydrogen on the carbon atom can be substituted by fluorine; and X1, X2 and X3 are one of H, F, Cl,-CH3,-C2H5,-CF3 or-OCF3. The liquid crystal composition comprises a liquid crystal compound with a structure shown in a general formula I. The diphenylacetylene liquid crystal compound containing the difluoroethylene end group has the advantages of low melting point, wide nematic liquid crystal range, high birefringence, low rotary viscosity and high dielectric adjustability, and is especially suitable for microwave antennas, liquid crystal THz optical devices and the like.

The invention relates to a pyrrolo [2, 1-b] quinazoline-9 (1H)-ketone derivative and application thereof. The invention discloses a method for synthesizing pyrrolo [2, 1-b] quinazoline-9 (1H)-ketone based on cyclization reaction of 2-(phenylethynyl) quinazoline-4 (3H)-ketone and nitrostyrene and application of the pyrrolo [2, 1-b] quinazoline-9 (1H)-ketone, and belongs to the field of organic synthetic chemistry and medicinal chemistry. The synthesis method is realized through a 3 + 2 cyclization reaction of 2-(phenylethynyl) quinazoline-4 (3H)-ketone and nitrostyrene under base catalysis, the reaction condition is mild, the yield is good, and large-scale preparation is easy. The newly synthesized compound has obvious proliferation inhibition activity on various tumor cells such as gastric cancer, liver cancer, breast cancer, lung cancer, colon cancer, cervical cancer and the like, and can be used as a lead compound of an anti-tumor drug for preparing a novel anti-tumor drug.

The invention discloses a temperature-sensitive polyphenylacetylene chiral nano-microsphere and a preparation method thereof, and relates to the field of chiral materials.The preparation method comprises the steps that firstly, a spiral dendronized polyphenylacetylene copolymer is prepared through coordination copolymerization of two phenylacetylene monomers, then an aqueous solution is prepared and heated to the temperature above the phase change temperature, dehydration aggregation is conducted, and microspheres are formed; and continuously carrying out illumination cross-linking reaction to obtain the chiral nano-microspheres. The method is simple in step and rapid in reaction, and the prepared nano-microspheres have temperature responsiveness, stable chiral characteristics and adjustable particle size, and have good application prospects in the aspects of chiral recognition, chiral separation and the like.

This invention discloses a selective hydrogenation catalyst for phenylacetylene in the presence of styrene and its preparation method. The catalyst is a Ni-Zn catalyst with a regular surface morphology and a nano-leaf-like structure; the leaf thickness is 5-20 nm, the leaf width and length are 300-3000 nm, and the specific surface area is 70-240 m². 2 / g, pore volume is 0.25~0.60cm³ 3 / g. The nanosheet morphology on the surface of this catalyst not only effectively prevents the aggregation of Ni metal particles during high-temperature calcination and improves the dispersion of the active component, weakening the strong interaction between Ni and alumina, but also the active site isolation effect allows Zn to act as a selective promoter to improve the selectivity of styrene. Thus, it exhibits high activity and high selectivity in the selective hydrogenation reaction of phenylacetylene. When used for the selective hydrogenation of C8 fraction to remove phenylacetylene, this catalyst has the advantage of not easily agglomerating after high-temperature reduction, and at the same time has excellent hydrogenation selectivity.

The invention relates to the technical field of composite materials, in particular to a preparation method of a polyimide composite material. Comprising the following steps: S1, mixing phenylacetylene-terminated polyimide prepolymer powder with o-phenol phenolic resin, phenolic resin, a curing accelerator, a coupling agent and a release agent, stirring, adding a solvent to adjust the viscosity of a mixed system, and uniformly dispersing at a high speed to obtain a modified polyimide phenolic resin glue solution; and S2, dipping polyimide fiber filaments in the modified polyimide phenolic resin glue solution, performing, performing stepped heating curing, and finally cutting to obtain the polyimide composite material. The composite material is formed through a pultrusion process, has extremely high high temperature resistance, overcomes the defect that a traditional composite material cannot stably work for a long time at 350 DEG C, and has extremely high thermal stability and ageing resistance.