102 results about "Nitro compound" patented technology

The invention discloses a catalytic system for preparing amine compounds through nitro reduction and application of the catalytic system. The catalytic system comprises an alkaline aqueous solution, a reducing agent and a catalyst, the alkaline aqueous solution is an alkali metal hydroxide aqueous solution; the reducing agent is alkali metal hydroboron and / or alkaline earth metal hydroboron; the catalyst is copper salt lewis acid and / or other lewis acid; the other Lewis acid is selected from one or a combination of more of cobalt salt, ferric salt, zinc salt, manganese salt and palladium salt. When the catalytic system is used for reducing the aromatic nitro-compound, the using amount of a reducing agent is small, meanwhile, the using amount of an organic solvent is reduced, the reaction yield is high, the reaction is milder, and amplified production of the process is facilitated.

The invention relates to the technical field of flash fire lifting agents, and discloses a flash fire lifting agent of an electrolyte of a boron-free aluminum electrolytic capacitor and a preparation method of the flash fire lifting agent, and the flash fire lifting agent comprises the following components in percentage by mass: 10-30% of organic ammonium carboxylate; 5%-15% of a nitro compound; 3%-10% of a phosphate ester compound; 2%-8% of a polyethylene glycol derivative; 0.5%-3% of organic siloxane; and the balance of deionized water. Through the synergistic effect of the organic ammonium carboxylate, the nitro compound, the phosphate ester substance and the organosiloxane in a specific proportion, the sparking voltage of the electrolyte is remarkably improved, and the negative effects of boron elements on the environment and the performance of a capacitor are avoided; a nitro compound is used as an electron acceptor to inhibit hydrogen precipitation, and cooperates with phosphate to fill oxide film micropores and block current concentration; the organic siloxane forms a hydrophobic barrier on an electrode interface, electrolyte decomposition is delayed, the organic carboxylic acid ammonium salt accurately controls the free acid concentration, and the conductivity rise caused by hydrogen ion migration is avoided.

The invention relates to the technical field of gas production materials, and discloses preparation and application of a high-nitrogen energetic gas production material, triazole has high-energy and multi-nitrogen characteristics, nitryl compounds have high energy, and the combination of triazole and nitryl compounds enables the gas production material to have the characteristics of large gas production rate, low-temperature combustion, less harmful gas and the like; the molecular structure contains a large number of N-N, C-N and C = N bonds and has high enthalpy of formation, meanwhile, the content of C and H in the molecule is low, the density of the energetic material can be improved, the electronegativity of nitrogen and oxygen atoms in the structure is high, and the energetic material is a painful energetic material and has high safety in the using process; compared with similar gas production materials, the prepared gas production material has the advantages that the gas production rate is greatly increased, the amount of solid residues is greatly reduced, the added adhesive has no corrosivity, the prepared gas production material is good in fluidity, the external additive can play a role in slagging, and the residues are not prone to being sprayed out.

The application discloses a diamine containing a DDSQ base element and a preparation method thereof, and belongs to the technical field of gas separation and purification. The preparation method of the diamine containing the DDSQ base element is suitable for synthesizing DSDQ functional molecules with different molecular structures and reaction activities, and meets the polymerization requirements. The preparation method of the polyimide gas separation membrane is as follows: firstly, a nitro aryl amine functional molecule is synthesized; then, the nitro aryl amine functional molecule is reacted with a DSDQ binary anhydride synthesized by using a disclosed technical solution to obtain a double-nitro compound containing the DSDQ; finally, the double-nitro compound is hydrogenated and reduced to obtain a target molecule, namely, a DSDQ diamine. The DSDQ diamine is condensed with a binary anhydride to obtain a polyamide acid precursor, and the polyamide acid precursor is cyclized and dehydrated to obtain a polyimide. Finally, the polyimide gas separation membrane containing the DSDQ base element is obtained by using a dissolving-tape casting method. The separation membrane still has stable gas permeability and relatively constant selectivity after physical aging for 300 days at room temperature, and has outstanding anti-aging performance.

The objective is to provide a solid electrolytic capacitor that has sufficient lifespan characteristics under high-temperature conditions. [Solution] A solid electrolytic capacitor is provided, having an anode foil, a cathode foil, and a separator between them, with an oxide film formed on their surfaces, and having an electrolyte portion in the gap between the anode foil and the cathode foil, wherein the electrolyte portion is composed of a solid electrolyte containing a conductive polymer compound, a polyanion dopant, an aromatic nitro compound having a polar group, and a secondary dopant as an optional swelling agent.

The application discloses application of a nitro compound in preparation of products prolonging life, and the nitro compound has the structure shown in the following general formula (I). The application takes Caenorhabditis elegans as an object, and studies influence of TBN on life and health indexes of the Caenorhabditis elegans. Experimental results show that the TBN prolongs the life of the Caenorhabditis elegans, significantly improves pharyngeal pumping rate and movement ability of the Caenorhabditis elegans, and significantly reduces lipofuscin accumulation degree of the Caenorhabditis elegans.

The invention provides a production method and production equipment of an aromatic nitro compound, and the production method comprises the following steps: carrying out nitration reaction on fuming nitric acid, a sulfuric acid-nitric acid mixed solution and aromatic hydrocarbon to obtain a nitration product crude product and waste acid; performing first-stage pickling on the nitration product crude product by using first pickling water to obtain a first-stage pickled crude product and first-stage yellow water; performing second-stage pickling on the first-stage pickling crude product by adopting second pickling water to obtain a second-stage pickling crude product and second-stage yellow water; mixing the first-grade yellow water with a nitric acid replenishing solution to obtain a sulfuric acid-nitric acid mixed solution, and returning the sulfuric acid-nitric acid mixed solution to the nitration reaction as a raw material; the second pickling water is concentrated wastewater generated by concentrating a byproduct dilute sulfuric acid in the preparation process of fuming nitric acid to form concentrated sulfuric acid; the first pickling water is a mixed solution formed by mixing secondary yellow water and sulfuric acid. The production method is good in operation stability, simple in technological process and low in cost.

The application relates to the technical field of nitro compound fertilizers, and discloses a nitro compound fertilizer solution granulation device, which comprises a mixing frame, a feeding frame in communication with the top of the mixing frame, a granulator in communication with the bottom of the mixing frame, a supporting frame fixedly connected to the surface of the mixing frame, a protection frame fixedly connected to the inner wall top of the mixing frame, a motor fixedly connected to the inner wall of the protection frame, a rotating rod fixedly connected to the output end of the motor, a mixing component arranged on the surface of the rotating rod, and a pushing component arranged at the end, away from the rotating rod, of the mixing component. After the nitro compound fertilizer raw materials enter the inside of the mixing frame through the feeding frame, the motor is powered on, the motor drives the mixing component to rotate in the inside of the mixing frame through the rotating rod, the mixing component mixes and stirs the nitro compound fertilizer raw materials when rotating, and the pushing component is arranged on the surface of the mixing component and mixes the nitro compound fertilizer raw materials.

The invention belongs to the field of fertilizer production, and particularly relates to a nitro-compound fertilizer and urea-based compound fertilizer production interchange method which comprises the following steps: early-stage configuration of a production system: arranging a urea-based secondary tank and a nitro secondary tank which are mutually independent and separately arranged, according to the invention, seamless interchange production of the nitro-compound fertilizer and the urea-based compound fertilizer on the same production line is realized by constructing a synergistic system of material distribution system-independent equipment-clean cleaning-parameter regulation and control. In the conversion process, the new formula production can be quickly linked only by completing the complete cleaning of the production line and the switching operation of the overflow pipeline of the first-stage tank, so that the tedious steps of the traditional conversion process are greatly simplified. According to the method, the conversion time is remarkably shortened, the comprehensive utilization rate of a production line is improved, and the problem that the conversion efficiency of a traditional process is low is solved through the standardized processes of order completion, thorough cleaning, overflow pipe switching and urea production starting during nitro-to-urea-based conversion and corresponding coherent operation of urea-to-nitro-based conversion.

The invention discloses a continuous thermal extraction method of a catalyst in a chloride compound, and relates to the technical field of catalyst extraction. A double-packed-tower series continuous extraction system is adopted, 90-DEG C hot water is used as an extraction agent, gradient separation of a catalyst is achieved through a pulse enhanced mass transfer technology, and the double-packed-tower series continuous extraction system comprises a control system, a first-stage extraction tower and a second-stage extraction tower, the control system adopts a DCS (Distributed Control System) to automatically adjust the temperature and flow of the first-stage extraction tower and the second-stage extraction tower, and the first-stage extraction tower and the second-stage extraction tower are connected through a spiral plate type heat exchanger; by means of the double-packed tower series connection and pulse enhanced mass transfer technology, interphase contact is enhanced, the mass transfer effect is improved, repeated extraction operation is not needed, the treatment period is shortened, and extraction agent consumption is reduced; by adopting an accurate temperature control and gradient extraction mode, nitro compound decomposition caused by temperature fluctuation is avoided, generation of by-products is reduced, and the separation and purification difficulty of a subsequent working section is reduced.

The application discloses a kind of ion imprinting self-assembly high tower nitro compound fertilizer and preparation method thereof, it is related to fertilizer technical field, nitro compound fertilizer raw material is made into matrix granule;Template metal salt, functional monomer containing olefin bond, solid crosslinking agent, hydrophobic modifier and thermal initiator are uniformly mixed, and self-assembly coating powder is made;Make self-assembly coating powder adhere to the surface of matrix granule;After coating, matrix granule is transferred into drum, and under the condition of 40 DEG C~60 DEG C, 60%RH~90%RH, 5r / min~15r / min, it is ripened 4h~12h, and ripened granule is obtained;Ripened granule is screened, and is dried, and ion imprinting self-assembly high tower nitro compound fertilizer is obtained.The application is by self-assembly coating powder adhering to the surface of matrix granule, ion imprinting crosslinked polymer layer and surface hydrophobic layer are formed by wet heat ripening, metal ion slow-release function can be realized and anti-caking performance is endowed to granule.

The invention relates to the technical field of catalytic hydrogenation, in particular to a catalyst and application thereof in preparation of procaine through hydrogenation, a high-molecular compound is introduced to the surface of a zirconium oxide carrier for pretreatment, a high-density oxygen defect structure is formed through roasting induction, and the interaction between active metal platinum and a carrier ZrO2 is remarkably enhanced; according to the preparation method, double assistant metals are adopted for synergistic modification, so that breakage of side reaction ester bonds can be effectively inhibited, the reaction selectivity and the target product yield are improved, alcohol byproducts and hydroxylamine byproducts are reduced, sharing of sodium hyaluronate and assistant metals is introduced, uniform distribution of the assistant metals on the surface of a carrier is promoted, and the agglomeration phenomenon is avoided; meanwhile, high dispersity and stability of the metal particles are guaranteed, so that the catalyst is endowed with excellent catalytic activity, selectivity and regeneration performance, the regenerated and activated catalyst still can keep good performance, and the catalyst is particularly suitable for hydrogenation of nitro compounds with ester groups.

The application discloses a method for preparing aromatic amine compounds by in-situ generating iridium catalyst to reduce nitro, and belongs to the technical field of chemical synthesis. The method is that aromatic nitro compounds, soluble iridium salt precursors and a solvent are placed in a reaction container, hydrogen is replaced after stirring reaction under the conditions of 60 atm hydrogen pressure and 25-50 DEG C for 24-48 hours, and the aromatic amine compounds are separated after reaction is completed; the molar ratio of iridium element in the soluble iridium salt precursors to the aromatic nitro compounds is 1:1000-100000. The method adopts a one-pot feeding method, generates high-activity heterogeneous iridium particle catalyst in-situ in the reaction system by using the soluble iridium salt precursors, and simultaneously completes hydrogenation reduction of the nitro. The method simplifies the process, reduces the cost, optimizes the post-treatment mode, and the in-situ generated catalyst has high activity, good selectivity, can be used repeatedly, and the noble metal catalyst is convenient to recycle.

This invention discloses a method for in-situ detection of NO2 free radicals during the catalytic decomposition reaction of hydroxylamine nitrate, comprising three steps: reaction system construction, in-situ catalysis-capture, and analytical detection. Specifically: Step 1, reaction system construction: mixing a catalyst, an aqueous solution of hydroxylamine nitrate, and an electron-rich compound to form a reaction system; Step 2, in-situ catalysis-capture: placing the reaction system constructed in Step 1 under normal pressure and reacting within a temperature range of 20-100℃, allowing hydroxylamine nitrate to decompose under the action of a catalyst to generate NO2 free radicals, while the NO2 free radicals react with the electron-rich compound to generate nitro compounds; Step 3, analytical detection: qualitative analysis of the nitro compounds generated in Step 2 is performed using nuclear magnetic resonance spectroscopy, and quantitative determination is performed using a chromatographic instrument.

The application belongs to the field of fine chemical industry, and proposes a synthetic route for preparing aromatic diamine from anisyl alcohol through esterification, carbon-carbon (C-C) coupling, nitration and reduction process. In the route, anisyl alcohol is first subjected to esterification reaction to obtain anisyl formate, the formate intermediate is further catalytically converted into a dimer, then the dimer is subjected to nitration to obtain an aromatic dinitro compound, and the nitration product is finally subjected to reduction to obtain the aromatic diamine. The route has high carbon yield and economic value.

The invention discloses an o-nitrophenol production wastewater treatment process aiming at environmental protection, and particularly relates to the technical field of industrial wastewater treatment and resource recycling, the o-nitrophenol production wastewater treatment process comprises the following steps: S1, pretreating wastewater and selectively extracting and recycling o-nitrophenol, S2, carrying out catalytic hydrogenation reduction on the pretreated wastewater to convert a nitro compound into an amino compound, and S3, carrying out catalytic hydrogenation reduction on the amino compound to obtain the o-nitrophenol production wastewater. The method comprises the following steps: S1, carrying out a hydrolysis reaction, S3, carrying out a directional hydrolysis reaction, and converting an amino compound into a recoverable chemical or an easily degradable intermediate, S4, carrying out deep biochemical and catalytic ozonation treatment on the hydrolyzed effluent, and S5, carrying out reverse osmosis treatment to realize the reuse of the produced water. According to the method, core pollutants are directionally converted into high-value resources, efficient purification, resource recovery and near-zero emission of wastewater are achieved, meanwhile, waste gas and waste residues are cooperatively treated, and the method has outstanding environmental and economic benefits.

The invention relates to a nitro continuous fixed bed hydrogenation production process under a platinum-based catalyst, and belongs to the technical field of fine chemical engineering. Placing the carrier in rolling equipment, and spraying a chloroplatinic acid solution; calcining in an air atmosphere, and reducing in a hydrogen atmosphere to obtain a catalyst carrier; dispersing the catalyst carrier in toluene, adding 2-mercaptobenzimidazole and aminoferrocene, and stirring for reaction to obtain a platinum-based catalyst; loading the prepared platinum-based catalyst into a fixed bed reactor with a gas-liquid mixing structure; dissolving nitrobenzene in a solvent to obtain a reaction solution; adding the reaction liquid and hydrogen into a fixed bed reactor through a mixer by virtue of a pump, and carrying out hydrogenation reaction with a platinum-based catalyst; after the reaction is finished, a reaction product is separated and purified to obtain aniline; when the prepared catalyst is used for continuous liquid phase hydrogenation reduction of nitro compounds in a fixed bed, generation of by-products can be effectively reduced, high-purity amino compounds are obtained, and extremely high catalytic efficiency is kept for a long time.

The application discloses taraxacum-derived carbon dots with tunable fluorescence and application thereof, and two kinds of carbon dots R-CDs and B-CDs with fluorescent colors can be obtained by high-temperature tuning with taraxacum as a carbon source, thereby creating conditions for double-channel fluorescence detection. The R-CDs can detect the percentage content of water in various organic solvents, and the test paper prepared can be repeatedly used for multiple times. The B-CDs are a multi-mode probe with fluorescence / colorimetric / absorption / RGB identification, and can simultaneously analyze and detect DNP in multiple ways. When a certain concentration of DNP is added into the B-CDs probe solution, a relatively significant fluorescence quenching phenomenon occurs, and the color of the solution becomes yellow. The specific detection of DNP is distinguished from other interfering components (metal ions, biological molecules and aromatic nitro compounds), and the detection method can be verified with each other, thereby improving the accuracy of detection. Meanwhile, the double-channel and multi-modal target detection is realized.

The application relates to the technical field of catalytic materials, and relates to an organic photocatalytic material and a preparation method thereof.1, comprising the following steps: mixing modified N-hydroxy phthalimide phenylacetate, an aliphatic nitroalkane, 2,6-dimethylpyridine, a photocatalyst and a solvent, then irradiating under visible light, placing in an inert atmosphere, stirring for 2-8 hours, and obtaining a product through post-treatment to obtain a final product; the mass ratio of the modified N-hydroxy phthalimide phenylacetate, the nitro compound, the 2,6-dimethylpyridine, the photocatalyst and the solvent is 2-5:1-2:1-3:1:8-11. The visible light catalysis method can be used to synthesize the nitro compound under mild conditions, and further provides a green and efficient new path for the preparation of a nitrogen-containing drug intermediate.

The present invention relates to a process for the preparation of an aromatic amine by hydrogenation of an aromatic nitro compound, comprising the following steps: (I) providing a copper tetramine salt-based impregnation catalyst, in particular an impregnation catalyst obtainable by the incipient wetness method, comprising a metal or metal oxide on a support as a hydrogenation catalyst. At least metallic or oxidic copper (in particular CuO) is present and the mole fraction of Cu based on all metals present is in the range of 075 to 1, and wherein the support comprises shaped silicon-dioxide shaped bodies or silicon-carbide shaped bodies; (II) optionally, activating the hydrogenation catalyst by treating with hydrogen in the absence of the aromatic nitro compound; and (III) reacting the aromatic nitro compound with hydrogen in the presence of the, optionally activated, hydrogenation catalyst to obtain the aromatic amine.

The application belongs to the technical field of rare earth fluorescent probes, and particularly relates to application of a choline type rare earth fluorescent probe in detection of nitro compounds in ionic liquids and nitro compounds in water. The application synthesizes a choline type rare earth fluorescent probe [choline]3[Eu(dpa)3] (wherein choline is choline, and DPA is 2,6-pyridine dicarboxylic acid) which has good solubility and stability in ionic liquids and aqueous solutions. The synthesized choline type rare earth fluorescent probe is used as a rare earth fluorescent probe for detecting nitro compounds, and the fluorescence detection performance of the choline type rare earth fluorescent probe on various nitro compounds in water and 1-butyl-3-methyl imidazole hexafluorophosphate (BmimPF6) ionic liquids is explored. The application fills a blank of substance detection of rare earth fluorescent probes in ionic liquid solvents, and has important application value for realizing detection of nitro compounds in ionic liquids.

The invention relates to the technical field of biochemical engineering, in particular to a method for preparing a chiral beta-trifluoromethyl nitro compound through enzymatic high-enantioselective reduction, which successfully realizes efficient biological catalytic conversion of a beta-trifluoromethyl nitroolefin substrate under the synergistic effect of an NADPH (Nicotinamide Adenine Dinucleotide Phosphate) coenzyme system by adopting olefin reductase GluER and a variant thereof. The technology has excellent catalytic efficiency, and the substrate conversion rate is as high as 90%; absolute stereoselectivity is achieved, and the product enantiomer excess value (e.e) is 99% or above; a reaction system is simple, conditions are mild (normal temperature and normal pressure), and green chemical requirements are met. Compared with a traditional chemical synthesis method, a biological catalysis path shows remarkable advantages in the aspects of atom economy, environmental friendliness and optical purity of a product, and an innovative solution is provided for synthesis of chiral fluorine-containing drugs.

The application discloses a preparation method of a pyrrolidone derivative. Under the action of a non-precious bimetallic multifunctional catalyst, an acetylenic acid derivative shown in formula I is reacted with an amine, a nitro compound or a nitrile compound shown in formula II in a reaction solvent under the heating and stirring of hydrogen gas to prepare a pyrrolidone derivative shown in formula III, and a reaction formula is as follows: the non-precious bimetallic multifunctional catalyst is a nitrogen-doped carbon-based carrier NC derived from a metal-organic framework material ZIF-8 and an effective active ingredient embedded on the carrier NC; the effective active ingredient comprises two metals, one metal is Co, and the other metal is any one of Ni or Cu. The yield of the pyrrolidone derivative synthesized by the method can reach 77% to 100%. The method has the advantages of simple process, high selectivity of the target product, cleanness and environmental protection, small catalyst consumption, low cost, simple catalyst preparation, high catalytic stability and suitability for industrial production.

The application relates to a preparation method of a non-noble metal single-atom doped molybdenum carbide catalyst, wherein C3N4 is used as a self-sacrifice template, dopamine hydrochloride and alkali are sequentially added into a solvent A, then in-situ polymerization is carried out, a polydopamine layer is coated on the surface of the C3N4 to obtain a precursor A; a metal source is dissolved in a solvent B, then the precursor A is impregnated, and the solvent is evaporated to obtain a precursor B; the precursor B is subjected to heat treatment at 600-1200 DEG C under an inert gas atmosphere, and the non-noble metal single-atom doped molybdenum carbide catalyst is obtained. The application also relates to a molybdenum carbide-based hydrogenation catalyst prepared by the method, the activity component has high dispersity, a two-dimensional porous structure is beneficial to the adsorption and diffusion of reactants, the preparation method is simple and easy to implement, and the catalyst has excellent catalytic performance in selective hydrogenation of aromatic nitro compounds, selective hydrogenation of quinoline and the like.

This invention relates to a 3-methyl-2-buten-1-aldehyde diisopentenyl acetal, comprising a nitro compound (calculated as NO2) with a mass content of less than 500 mg / kg. The 3-methyl-2-buten-1-aldehyde diisopentenyl acetal has high purity and good stability.

The utility model discloses a production system of a nitro-compound fertilizer, and belongs to the technical field of compound fertilizers. Comprising a melting tank, a first-stage mixing tank, a second-stage mixing tank, a uniform mixer, a granulation tower and a discharging heat-preservation conveying pipe, the heights of the melting tank, the first-stage mixing tank and the second-stage mixing tank are sequentially reduced, an overflow port of the melting tank is connected with a feeding port of the first-stage mixing tank, and an overflow port of the first-stage mixing tank is connected with a feeding port of the second-stage mixing tank; a feed port of the uniform mixer is directly connected with an overflow port of the secondary mixing tank, and a first powder spraying discharge port is formed in the upper part of the uniform mixer; a discharge port of the melting tank is connected with a feed port of the secondary mixing tank; the first-stage mixing tank, the second-stage mixing tank and a discharge port of the uniform mixer are connected with a discharge heat-preservation conveying pipe; a second powder spraying and discharging opening is formed in the discharging end of the discharging heat preservation conveying pipe; the granulation tower is connected with one of the first powder spraying discharge port and the second powder spraying discharge port; during production, the granulation tower is connected with the first powder spraying discharge hole; and during shutdown, the granulation tower is connected with the second powder spraying discharge port.

The invention discloses a method for preparing a benzoxazinone compound, which comprises the following steps of: firstly, obtaining a mixed solution of 2-nitro-5-fluorophenol and 3-fluoro-4-nitrophenol from 2, 4-difluoronitrobenzene under the action of alkali, then washing the mixed solution with methylbenzene, removing a methylbenzene layer, regulating the pH value of a water layer to be acidic with acid, and then washing the water layer with methylbenzene to obtain a mixed solution of 2-nitro-5-fluorophenol and 3-fluoro-4-nitrophenol; separating a water layer to obtain a mixture of the 2-nitro-5-fluorophenol and the 3-fluoro-4-nitrophenol; etherifying the obtained mixture and a compound with a structural formula I under the condition of an acid-binding agent to obtain an etherified mixture; reacting the obtained etherified mixture with nitric acid to obtain a nitro compound; then reducing the nitro compound into a diamino compound; compared with a traditional method, the preparation method disclosed by the invention has the advantages that the raw materials are cheap, the reaction conditions are mild, and the safety is high; and the prepared product is high in yield.

The invention discloses a method for selective fluoroallyl alkylation of difluorocyclopropane by using sec-nitro alkane, which comprises the following steps: by using sec-nitro alkane and gem-difluorocyclopropane as raw materials, carrying out ring-opening selective ring-opening reaction on the sec-nitro alkane and gem-difluorocyclopropane through transition metal catalysis to generate a branched chain type fluorine-containing allyl tertiary nitro compound. The method has obvious advantages in the aspects of synthesis conditions and practicability, has the advantages of simple synthesis steps, simplicity and convenience in operation, cheap and easily available raw materials, good compatibility to functional groups, regioselectivity, high reaction efficiency and the like, and also provides reference and reliable technical support for a branched chain type regioselective allylation method.

The invention discloses a preparation method of a platinum-based multi-metal catalyst. The preparation method comprises the following steps: 1, modifying a carrier by adopting hypophosphorous acid and sodium silicate together; 2, mixing sodium carbonate, formaldehyde and the modified carrier in deionized water, and stirring to obtain carrier slurry; 3, mixing a Pt-containing compound, an auxiliary active component-containing compound and oleic acid in deionized water, and then dropwise adding the mixture into the carrier slurry to prepare a catalyst precursor; 4, drying to constant weight; 5, dissolving an auxiliary agent in pure water, mixing with the dried catalyst precursor to form slurry, uniformly stirring, standing, and filtering; and 6, drying and roasting to obtain the platinum-based multi-metal catalyst. In addition, the invention also provides application of the catalyst prepared by the method in preparation of arylamine by hydrogenation of an aromatic nitro compound. The catalyst prepared by the method has the characteristics of high activity, good selectivity and long service life.

The invention discloses a high-dispersion metal co-doped carbon catalyst and a preparation method and application thereof.The preparation method comprises the steps that S1, organic matter is adsorbed by layered double-metal hydroxide, and organic-carbon-containing micromolecule anchored layered double-metal hydroxide is obtained; and S2, carrying out heat treatment on the micromolecular anchoring layered double metal hydroxide containing the organic carbon at the temperature of 600-1400 DEG C. The catalyst is prepared by the method and can be used for catalyzing nitro reduction reaction of aromatic hydrocarbon. The high-dispersion metal co-doped carbon catalyst prepared by the invention has very high catalytic activity, stability and cycle performance, can realize magnetic separation, and is especially suitable for catalysis of reduction reaction of aromatic nitro compounds. The preparation method has the advantages of cheap and easily available raw materials and simple process, and is suitable for large-scale industrial production.