193results about How to "Advantages of preparation method" patented technology

The invention discloses a preparation method of paraphthaloyl chloride with high purity, which takes terephthalic acid and a chlorinating agent as materials to prepare the paraphthaloyl chloride with high purity by reflux reaction and distillating separation for one time under the condition of catalysts, and then the method conducts treatment on byproducts to obtain additional products which can be utilized. The method has the advantages of being capable of improving the yield of the product to over 90-95 percent, realizing closed cycle for tail gas absorption and utilization, having no pollution to environment and being capable of achieving over 99.95 percent of product purity.

The invention provides a graphene heating film and a preparation method thereof. The graphene heating film is characterized by comprising a first insulated waterproof layer, an electrode layer, a heating film layer and a second insulated waterproof layer, wherein the first insulated waterproof layer, the electrode layer, the heating film layer and the second insulated waterproof layer are pasted into an integral structure; and the heating film layer is a graphene film. The preparation method of the graphene heating film comprises the following steps: (1) fabricating the graphene film; (2) covering the second insulated waterproof layer with a bonding adhesive; (3) bonding the second insulated waterproof layer and the graphene film into a whole; (4) removing a metal substrate on the graphene film; (5) pasting the electrode layer on the graphene film; (6) pasting the first insulated waterproof layer on the electrode layer; and (7) connecting the electrode layer and a lead wire. According to the graphene heating film and the preparation method thereof provided by the invention, the heating efficiency is high; large-area transferring of the graphene film can be achieved; the transfer time is short; and the transfer rate is high.

The invention relates to a producing process of the polyimide / silicon dioxide nm hybridization film. The method improves the existing sol-gel method; the positive silicate sol solution is added in before the forming of the polyamic acid to carry the hydrolytic condensation of the sol-gel and the macromolecule polyreaction of the polyamic acid synchronously; finally, it can be gained by the hot imine treatment of the composite composed by the polyamic and the positive silicic acid. Using the producing process of the polyimide / silicon dioxide nm hybridization film provided by the invention, the polyimide / silicon dioxide nm hybridization film stuff of separating evenly and having the physiofacies of which the size reached to the order of magnitude of 5nm-1um. Comparing with the existing technic, the method can avoid the problem of the silicon dioxide grain is difficult to be separated in the basal body because of the high solution viscosity of the polyamic acid; so it can improve the compatibility of the two phase; the ability of the mechanics and the optics of the hybirgization film is improved highly.

The invention provides a gold nanoparticle triangular plate preparing method and a method for preparing gold nanoparticle discs and gold nanoparticle hexagonal pieces on the basis of the gold nanoparticle triangular plate preparing method, relates to the technical field of gold nanoparticle preparing, and aims at providing the method which is easy and convenient to operate, high in repeatability and efficiency and is used for preparing gold nanoparticle triangular plates, gold nanoparticle discs and gold nanoparticle hexagonal pieces. The gold nanoparticle triangular plate preparing method includes the steps of preparing a gold nanoparticle seed solution through a sodium citrate aqueous solution, a tetrachloroauric acid aqueous solution and a sodium borohydride aqueous solution, preparing a gold nanoparticle triangular plate solution through the preapraed seed solution, a cetyl trimethyl ammonium bromide aqueous solution, a tetrachloroauric acid aqueous solution, a potassium iodide or sodium iodide aqueous solution, a sodium hydroxide aqueous solution and a ascorbic acid aqueous solution, and obtaining gold nanoparticle triangular plates after the liquid supermatant is abandoned. The method is easy and convenient to operate and high in repeatability and controllability, the prepared gold nanoparticle plates are unified in size, gold nanoparticle plates of different types and sizes can be synthesized, and the purity reaches 95% or higher.

A sulfur-transferring catalyst comprises a cerium oxide of 2í½30úÑ by weight as the active component and a spinel compound of 70í½98úÑ by weight containing magnetium and aluminum as the carrier. The spinel compound containing magnetium and aluminum comprises MgO of 5í½70úÑ, Al2O3 of 30í½ 95%, an oxide of a rare earth element of 0í½15 úÑ except cerium, V2O5 of 0í½10úÑ,relative to the total weight of the compound. Moreover, the invention provides a method of producing the catalyst. The sulfur-transferring catalyst has a high efficiency of absorbing and desorbing SO x.

The invention provides a preparation method and applications of a multi-level pore structure metal organic framework material. The preparation method comprises: mixing a metal salt, an organic ligand, N,N-dimethylformamide, water and carboxylic acid, uniformly stirring, carrying out a hydrothermal reaction, cooling to a room temperature after completing the hydrothermal reaction, carrying out centrifugation, and purifying to prepare the multi-level pore structure metal organic framework material. According to the present invention, the prepared multi-level pore structure metal organic framework material has characteristics of stable performance and controlled and uniform pore size; and phosphotungstic acid is loaded in the mesoporous channel of the metal organic framework material through an in-situ synthesis method, the original framework structure can be remained after the loading, and the presence of the mesopores allows the contact between the large substrate molecule and the active site so as to extend the application range of the multi-level pore structure metal organic framework material.

The invention belongs to the technical field of lithium ion batteries and especially relates to a preparation method of a lithium-rich anode strip of a lithium ion battery. The preparation method comprises the following steps of 1, coating anode slurry on an anode current collector and drying to obtain an anode strip which comprises an anode diaphragm and needs lithium supplement, and 2, wetting the anode strip needing lithium supplement by an electrolyte until the anode diaphragm is wetted fully, and carrying out dual-channel contact between the anode diaphragm and lithium metal to obtain a lithium-rich anode strip, wherein in contact, a temperature is in a range of 10 to 150 DEG C and pressure intensity is less than 100MPa and contact time is less than 10 hours. Compared with the prior art, the preparation method has the advantages that an ion channel and an electron channel between lithium metal and the anode diaphragm can be formed simultaneously; a potential difference between an anode material and lithium metal can promote fast ionization of lithium metal so that lithium ions are formed; and the formed lithium ions are transferred and embed into anode active substance particles so that fast lithium supplement is realized. The preparation method has simple processes and can realize industrial batch production easily.

The invention discloses a preparation method for a fluidized bed catalyst. The preparation method comprises the following steps: (1) adding reaction liquid into an impinging stream reactor, enabling the reaction liquid to reach the bottom of the impinging stream reactor, heating and starting a stirring paddle at the bottom; (2) respectively injecting an alkali metal aluminate aqueous solution and CO2 gas flow through an acceleration pipe at the upper part of the impinging stream reactor, performing gas-liquid impinging stream reaction on the alkali metal aluminate aqueous solution subjected to atomization and the CO2 gas flow to generate an aluminum hydroxide crystal nucleus entering a settling region; (3) at the end of the gas-liquid impinging stream reaction, simultaneously and continuously adding an acidic aluminum salt aqueous solution and the alkali metal aluminate aqueous solution or an alkaline settling agent from feed inlets II and III, adjusting the pH value, and performing neutral reaction; (4) performing aging, filtering, washing and drying to obtain aluminium oxide dry glue; (5) uniformly mixing the aluminium oxide dry glue, small-hole SB powder and sesbania powder, adding an adhesive to form a plasticizer, performing extrusion and forming, drying and roasting to obtain an aluminum oxide carrier, immersing active metal, drying and roasting to obtain the fluidized bed catalyst. The impinging stream reactor is adopted in the method, so that the transfer characteristic between the gas phase and the liquid phase as well as between one liquid phase and another liquid phase is enhanced, so that the prepared fluidized bed catalyst is high in intensity and low in abrasion; furthermore, the pore volume and the aperture of the catalyst are larger.

The invention relates to a preparation method of a sodium manganese oxide, and particularly relates to a preparation method of a layered birnessite type sodium manganese oxide. The preparation method is as follows: reacting a two valent manganese salt with sodium hydroxide in an aqueous phase to obtain a Mn (OH)2 precipitate and / or MnOOH precipitate-containing suspension, then performing solvent evaporation to obtain a MnOOH precipitate and / or Mn (OH) 2 precipitate-containing mixture; grinding the mixture, and sintering at 600-1200 DEG C to obtain a sintering product; then performing washing and solid-liquid separation for multiple times, and finally drying to obtain a final product. According to the preparation method, molecular level mixing of manganese hydroxide and a sodium salt can be realized by a solution chemical reaction method, promotion of next-step solid phase reaction is facilitated, improvement of the purity of the product is facilitated, and the prepared sodium manganese compound can be used in a sodium ion battery using an aqueous solution as an electrolyte, and helps to improve the charge discharge performance of the battery.

The invention discloses a novel inorganic artificial quartzite and a preparation method thereof and belongs to the field of building decorative materials. The novel inorganic artificial quartzite provided by the invention comprises the following raw materials by weight parts: 2-20 parts of inorganic polymer A components, 4-20 parts of inorganic polymer B components, 50-90 parts of aggregates and 0.1-1.0 part of additives. The preparation method provided by the invention comprises the following steps: uniformly stirring the components, such as inorganic polymers, pigments, aggregates, and additives, according to a certain technology, and then performing the processes of distributing materials, vacuumizing, vibrating, pressing and forming, fixing thickness, curing, polishing, cutting, protecting and the like, thereby obtaining the inorganic artificial quartzite. The production technology for the inorganic artificial quartzite is simple; during the production process, a plate surface is free from being cracked and warped; the mechanical property is excellent, the glossiness is high and the hardness is high; and the novel inorganic artificial quartzite belongs to a novel environment-friendly product which can be widely applied to various indoor and outdoor decorative and fitting-out projects.

The invention relates to a preparation method of millet germinated brown rice rich in gamma-aminobutyric acid. The preparation method comprises the following steps of firstly, hulling millets, removing millet husks, mainlining millet bran and germs to obtain millet brown rice, and cleaning the millet brown rice by subacidity electrolyzed water with available chlorine of 5-300ppm so as to obtain cleaned millet brown rice; 2) soaking the cleaned millet brown rice into a CaCl2 culture liquid for 8-12 hours, removing a soaking liquid, sprouting out of the sun, and culturing for 48-72 hours; and 3) carrying out enzyme deactivation and drying treatment on the millet brown rice after germination culture so as to obtain millet germinated brown rice. The method provided by the invention can be used for effectively controlling the microorganism pollution in the germination process, is high in germination rate and is short in germination time; the enrichment degree of nutritional components in the millet germinated brown rice obtained after germination can reach 126.60mg / 100g, and is a novel functional food and an ideal whole-grain food.

The invention belongs to the technical field of lithium ion batteries and particularly relates to an anode of a lithium ion battery. The anode of the lithium ion battery comprises an anode current collector and an anode film coated on the anode current collector, and the anode film comprises anode active material, adhesive and conductive additive. The surface of the anode active material is coated with ethylene carbonate (EC), and the weight ratio of the EC and the anode active material is (0.1-30):(99.9-70). Compared with the prior art, the EC coated on the surface of the anode active material is dissolved in electrolyte after liquid injection, the space occupied by the EC in the film can be released, so that a certain space is reserved for expansion of particles of the anode active material during charging and circulating, and the problem of deformation of flexibly-packaged cell due to expansion of the active material is eliminated. Further, the invention further discloses a method for preparing the lithium ion battery, namely the lithium ion battery comprising the anode.

The invention provides a porosity change controllable porous ceramic material and a preparation method thereof. According to the change rule of the porosity change of the porous ceramic material withthe thickness, the change rule of the solid phase content of ceramic slurry for preparing the porous ceramic material with the thickness is determined; in the 3D printing process, according to the change rule of the ceramic slurry solid phase content, the adding mass of first slurry containing a ceramic phase and hydrosol is controlled, and printing is conducted layer by layer; an obtained ceramicslurry gel block is subjected to low temperature freezing, vacuum freeze drying is conducted, and a dried ceramic green body is obtained; sintering and cooling are conducted, and the porous ceramic material can be obtained. The porosity change controllable porous ceramic material is simple in technology, and use requirements of different fields can be met.

The invention relates to a PET (polyethylene terephthalate)-based electromagnetic shielding composite and a preparation method thereof. The composite comprises a PET matrix material and nanometer inorganic filler uniformly dispersed in the PET matrix material. The composite is characterized in that the composite nanometer inorganic filler consists of graphene which is 0.35-20nm in thickness and 1-20mu m in diameter and silver nanowires which are 40-500nm in diameter and 5-50mu m in length. The PET-based electromagnetic shielding composite has favorable electromagnetic shielding performance, has excellent electromagnetic shielding performance and stable performance compared with the common anti-radiation fabric and can substitute for the traditional anti-radiation fabric. The PET-based electromagnetic shielding composite is suitable for manufacturing of anti-radiation clothes.

The invention discloses a preparation method of a secondary-electron emission thin film. The preparation method comprises the following steps: (1) depositing a buffer layer on a metal substrate; (2) depositing a magnesium oxide and metal mixed layer on the buffer layer by sputtering a magnesium target / magnesium oxide target and sputtering other metal targets; (3) depositing a surface on the magnesium oxide and metal mixed layer. In the step (2), the two targets are used for respectively depositing magnesium oxide and other metals, the sputtering power, the sputtering time, the flow rates of working gas and reactant gas and the temperature of the substrate are individually controlled so as to prepare the magnesium oxide and metal mixed layer with proper magnesium oxide and metal grain size, magnesium oxide crystallization orientation, metal content and distribution of metal grains in a membrane layer and thickness of the membrane layer. The secondary-electron emission thin film prepared by the method has high secondary electron emission yield and good electrical conductivity, and therefore, the secondary-electron emission thin film has high secondary-electron emission stability.

The invention provides a polypropylene foam material and a preparation method thereof. The polypropylene foam material comprises matrix resin which is composed of, by weight, 30 to 70 parts of polypropylene with high melt strength, 10 to 50 parts of a polypropylene random copolymer and 5 to 30 parts of low-density polyethylene; and the polypropylene foam material further comprises, on the basis of 100 parts by weight of the matrix resin, 0.1 to 0.5 part by weight of a gas nucleating agent, 5 to 16 parts by weight of a physical foaming agent, 0.5 to 1 part by weight of an antioxidant and 1 to 10 parts by weight of a cell stabilizer. The polypropylene foam material provided by the invention has the advantages of good cell homogeneity, large cell density and no secondary environmental pollution.

The invention relates to a preparation method of an alumina supporter. The preparation method comprises the steps of weighing a certain quality of pseudo-boehmite dry glue powders, evenly mixing the pseudo-boehmite dry glue powders with a certain quality of aqueous solution of ammonia, placing mixing materials in a sealing container for hydro-thermal treatment, conducting molding, drying and roasting on the materials after the hydro-thermal treatment to prepare the alumina supporter. A mass concentration of the aqueous solution of ammonia is 1%-10%, and the adding quantity of the aqueous solution of ammonia is 50-100% of that of the pseudo-boehmite dry glue powder. The hydro-thermal treatment adopts forcing hydro-thermal type, the pressure of the hydro-thermal treatment is self-generated at a hydro-thermal treatment temperature, and the hydro-thermal treatment temperature is 100 DEG C-150 DEG C, a hydro-thermal treatment time is 1-5 hours. The alumina supporter prepared by the preparation method has a large hole volume and a large hole diameter, has concentrated hole distribution, has moderate mechanical strength, and the alumina supporter is applicable to the field preparation of heavy oil and residual oil hydrodemetallization catalyst and the like.

The invention provides a preparation method of an environment-friendly sewage treatment agent. The preparation method includes: using ferrous sulfate, diatomite, modified lignin sulfonate, polyferric chloride, activated carbon, sodium carbonate, cottonseed hull, polyacrylamide, activated sludge and water as raw materials; adding ferrous sulfate, diatomite, modified lignin sulfonate, polyferric chloride, activated carbon, sodium carbonate and cottonseed hull into a grinder for grinding, mixing well, adding activated sludge and water while stirring, heating to 35-40 DEG C after reaction for 20-30 min, adding polyacrylamide while stirring, and stirring and mixing well for reaction for 1-5 h. The preparation method is simple and free of secondary pollution, and the treatment agent prepared by the method is high in removal rate of BOD, COD and suspended matter in sewage and wide in application range.

The invention provides a preparation method of negative electrode slurry. The preparation method comprises the following steps: (1) preparing a glue solution; (2) curing the glue solution; (3) mixingdry powder; (4) carrying out high-viscosity mixing; (5) carrying out first high-speed dispersion; (6) carrying out second high-speed dispersion; (7) adjusting the viscosity; (8) carrying out reverse stirring; according to the preparation method of the negative electrode slurry, the dispersion uniformity, the stability and the rheological property of the slurry can be improved, the production efficiency of a coating process is improved, and the coating appearance and the coating thickness uniformity are improved, so that the electrical performance and the safety performance of a lithium ion battery are improved. And on the premise of ensuring the performance of the slurry, the stirring time of the slurry is shortened, large-scale application is facilitated, and great production practice significance is achieved.

The invention provides a high-voltage composite spinel-coated positive electrode material and a preparation method thereof. The positive electrode material comprises a lithium cobalt oxide core, a spinel-type lithium nickel manganese oxide middle layer and a solid electrolyte surface layer. The invention provides a positive electrode material with a composite coating layer on the surface, and the coating layer has good lithium ion conductivity, so that the positive electrode material is high in discharge capacity and excellent in cycle life under a high voltage without influencing a discharge platform, the volume energy density of a lithium ion battery is improved, and the corrosion of HF to the surface layer of the material can be reduced; and the high-temperature cycle life of the material is prolonged, so that the defects of unstable use structure of the positive electrode material under high charging cut-off voltage or poor cycle performance and low discharge capacity even if the structure is stable in the prior art are overcome, the high-temperature cycle performance is improved, and the material is more suitable for the actual use working condition of the material.

The invention relates to a palladium nanoparticle catalyst and a preparation method as well as an application thereof. The preparation method comprises the following steps: controlling the pH of the reaction environment to be equal to 2; combining metal ions of different concentrations with inner N of branches; and finally, reducing the metal ions by utilizing NaBH4 to generate a metal Pd nanoparticle catalyst with different diameters (1-3nm) of particles. The catalyst has good catalytic effect on the Suzuki reaction aided by microwaves. The method has the characteristics of simple process, convenient operation, controllable shape, good application effect and the like.

The invention provides a preparation method of ilaprazole. According to the method, ilaprazole is prepared through a thioether intermediate; obtained ilaprazole is high in quality and has no overoxidation impurities; the method is simple and easy, high in yield, low in cost, environment-friendly, and suitable for industrial production, and has no need for special equipment; and no toxic chloroform solvent is used.

The invention discloses a preparation method of aluminium oxide dry glue. The preparation method comprises the following contents: (1) adding bottom water into the bottom of an impinging stream reactor and heating to a certain temperature, starting stirring blades at the bottom; (2) starting an accelerator and respectively injecting an alkali metal aluminate aqueous solution and CO2 airflow by accelerating tubes at the upper part of the impinging stream reactor, atomizing the alkali metal aluminate aqueous solution by a pressure atomizing nozzle, carrying out a gas-liquid impinging stream reaction between the atomized alkali metal aluminate aqueous solution and the CO2 airflow in a gas-liquid impinging area so as to generate aluminium oxide crystal nucleus, and letting the aluminium oxide crystal nucleus enter a settling zone after settlement; (3) simultaneously and continuously adding an acidic aluminium saline solution and the alkali metal aluminate aqueous solution or an alkali precipitant into feed inlets II and III at two ends of the bottom of the impinging stream reactor after the end of the gas-liquid impinging stream reaction, adjusting pH value, carrying out a neutralization reaction and stabilizing for a period of time; and (4) shutting down the impinging stream reactor after the end of the stabilization, aging, filtering, washing and drying to obtain the aluminium oxide dry glue. The aluminium oxide dry glue can be used for preparation of a hydrogenation catalyst carrier.

The invention provides a preparation method of a hydrogenation catalyst. According to the method, a part of active metal components and an organic complexing agent are introduced in a carrier moldingprocess, a carrier is molded through a certain calcining treatment procedure, and then a subsequent active metal soaking step is performed to obtain the hydrogenation catalyst. According to the hydrogenation catalyst prepared with the method provided by the invention, active metals are dispersed uniformly; the preparation method is simple and feasible, and is particularly suitable for an ultra-deep hydrodesulfurization reaction of diesel oil.

The invention provides an ultra-efficient organic electroluminescent diode device which comprises a gradient-doped double-body light-emitting layer. The double-body light-emitting layer comprises a single-band light-emitting layer or a multi-band light-emitting layer. The light-emitting form comprises fluorescence, phosphorescence or heat excitation delayed fluorescent luminescence. The device further comprises a transparent conductive glass substrate, a hole injection layer, a hole transport layer, an electron and exciton blocking layer, an electron transport layer, an electron injection layer or a metal cathode electrode. The method greatly reduces the selection requirement of a donor material, and improves the universality of the donor material. A formed exciplex can excite the long-wavelength donor material, and can prepare an efficient multi-band device. Through the structure design of the gradient-doped light-emitting layer, the start and working voltage of the device can be reduced. A widened exciton composite region effectively reduces the roll-off of the current efficiency and power efficiency of the device under high brightness. The spectral stability of single-band and multi-band devices is greatly improved under different working brightness.

The invention relates to a hard polyimide foam material and a preparation method thereof, and belongs to the technical field of preparation of high-molecular polyimide foam materials. The preparationmethod comprises the steps of adding an aromatic dianhydride into a tetrahydrofuran / fatty alcohol mixed solvent, and conducting heating to dissolve the aromatic dianhydride; after the solution is transparent, adding an aromatic diamine for reaction to form a foam precursor solution, then adding a foam stabilizer and a foaming aid, and conducting uniform mixing; placing the solution in a drying oven to remove the solvent, and then raising the temperature to carry out primary foaming; and carrying out mold pressing on a primary foamed product to a compact state, further raising the temperature,and carrying out secondary foaming to obtain the polyimide foam. The method has the characteristics of low preparation cost, rich candidate raw materials, easiness in realizing large-scale productionand the like; and the prepared foam material has the characteristics of being uniform in foam structure, adjustable in apparent density, high in compressive strength, high in closed cell rate and almost free of slag falling.

The invention discloses a guided missile launching canister and a manufacturing method thereof, and belongs to the technical field of guided missile ejector system fittings. The guided missile launching canister comprises a canister body and a guide rail assembly, wherein the canister body is manufactured from a composite material; the guide rail assembly is manufactured from a composite material;the canister body and the guide rail assembly are integrally formed; a cavity is arranged in the canister body; the guide rail assembly is connected to the inner wall of the cavity; the guide rail assembly is used for controlling a launch form and interpenetration of a cable and electronic parts and components; and the guide rail assembly is of a hollow structure. The guided missile launching canister solves the technical problems that the guided missile launching canister is manufactured from a metal material, is great in weight, and is labor-wasting in operation, and weight of the launchingcanister is increased as the guide rail is of a solid structure in the prior art. According to the guided missile launching canister disclosed by the invention, the canister body and the guide rail assembly are manufactured from the composite material, and are integrally formed, so that integral weight of the launching canister is ensured to be small, and operations are labor-saving; and the guide rail assembly which is of a hollow structure is connected in the canister body, so that weight of the lunching canister is reduced.

The invention belongs to the technical field of phone protective films, and particularly relates to a preparation method of a curved screen phone tempered glass film. The preparation method comprises the following steps: attaching an OCA optical adhesive with a specific thickness to the upper surface of a TPU (thermoplastic polyurethane) substrate, attaching a silica gel with a specific thickness to the lower surface of the TPU substrate to obtain a TPU film, and attaching the TPU film to a glass film subjected to hot bending tempering treatment. The curved screen phone tempered glass film has the advantages of favorable hardness, favorable water resistance and favorable high-temperature resistance, and can achieve favorable effects of impact resistance, scratch resistance, wear resistance and drop prevention. The curved screen phone tempered glass film can be completely attached to the phone curved screen without the phenomena of bubbles, degumming, press marks and the like, can effectively enhance the aesthetic property of the phone, can not influence the sensitivity of the phone screen after being attached to the phone curved screen, and is an ideal curved screen phone tempered glass film.

The invention discloses a preparation method of microwave-cooked instant fish. The preparation method comprises the following steps: (1) pretreating, washing a fish body and freezing, unfreezing the fish body and washing by using clean water during preparation, removing the head, the tail part and the internal organs, shredding the fish body into fish pieces, washing the fish pieces again by using clean water, and draining off the water; (2) salting, adding edible salt and edible vinegar into water to prepare a salting solution and salting the fish pieces in the salting solution; (3) drying, washing the slated fish pieces, draining off the water and then drying; (4) pasting, adding an edible compound membrane into water, dissolving, uniformly stirring, then adding flour to prepare a pasting solution, and soaking the dried fish pieces in the pasting solution; (5) frying in oil; (6) preparing a seasoning packet; and (7) packaging. The microwave-cooked instant fish prepared by the method disclosed by the invention is low in oil content, convenient to eat and sufficient nutrients of fish meat can be reserved.

The invention relates to a Pt-load catalyst taking mesoporous carbon as a carrier, which is characterized in that the mesoporous carbon is pretreated before Pt is loaded; the pretreatment method comprises one in the following steps of: (1) adding the mesoporous carbon into a 10-30% hydrogen dioxide solution, soaking for 1-24hours, washing and removing hydrogen peroxide; (2) adding the mesoporous carbon into a 1-6M hydrochloric acid or nitric acid solution, soaking for 1-24hours, washing and removing hydrochloric acid or nitric acid; and (3) adding the mesoporous carbon into a 1-6M sodium hydroxide solution, soaking for 1-24hours, washing and removing alkali, wherein the load quantity of Pt is 0.5-5%. The invention also relates to the application of the Pt-load catalyst in preparation of 2, 2'-dichloro hydroazobenzene (DHB) from ortho-nitrochlorobenzene through hydrogenation. The catalyst uses the mesoporous carbon as the carrier, so that the internal diffusion resistance can be better reduced, and the reaction speed is accelerated. The Pt-load catalyst is high in reaction activity and selectivity, and can be repeatedly used for more than eight times, so that the using cost of the catalyst is lowered.