1091 results about "Catalytic hydrogenation" patented technology

The invention relates to Omarlliptin, in particular to a novel method for preparing Istradafylline, and relates to a preparation method of Istradafylline, in particular to a preparation method of Istradafylline. The method comprises the following steps: carrying out coupling reaction on a compound Ia and TMS acetylene to obtain an intermediate Ib; carrying out bromination reaction on the intermediate Ic under the action of NBS (N-bromosuccinimide) to obtain an intermediate Id; carrying out substitution reaction on the intermediate Id and tert-butyl carbamate under the action of potassium tert-butoxide to obtain an intermediate Ie; reacting the intermediate Ie with paraformaldehyde to obtain an intermediate If; carrying out cycloaddition reaction on the intermediate If and the intermediate Ib to obtain a key intermediate Ig; carrying out asymmetric catalytic hydrogenation reduction on the intermediate Ig to obtain an intermediate Ih; and removing a protecting group from the intermediate Ih in a hydrochloric acid and ethyl acetate system to obtain a final product. The method is short in route, simple and convenient to operate, mild in condition, high in reaction yield, environment-friendly and easy for industrial production, and dangerous and highly toxic products are prevented from being used and hazardous chemicals are supervised. # imgabs0 #

The invention discloses application of a Ni-based reverse-phase catalyst in catalytic hydrogenation reaction of a nitro compound, nitro in the nitro compound is hydrogenated to reduce amino, the Ni-based reverse-phase catalyst is of an M / Ni reverse-phase structure, metal Ni for dissociating hydrogen serves as a carrier, nano metal M oxide is loaded on the carrier to serve as a loading phase, and reverse-phase interface active sites are constructed; wherein the metal M is one or two of Ce, Zr, Al, Y and Mg, and the mole fraction of the load phase metal M is 5-50% based on the mole fraction of all the metals in the catalyst being 100%. The preparation method of the catalyst is simple and easy to implement, the catalyst has a non-traditional supported reversed-phase structure, the activity of the catalyst is more excellent than that of a traditional supported catalyst when the catalyst is applied to the nitro-compound hydrogenation process, a traditional Raney nickel catalyst can be effectively replaced, a reaction system is clean and safe, repeatability is good, effective recycling can be achieved, and the catalyst is suitable for industrial production. The method is suitable for industrial production and has a good application prospect.

The invention discloses a method for joint production of cyclohexylamine and dicyclohexylamine, which comprises the following steps: 1) feeding aniline tail gas of a nitrobenzene catalytic hydrogenation production device into a gas-liquid separator for gas-liquid separation to obtain aniline tail hydrogen and aniline condensate; 2) mixing aniline tail hydrogen and new hydrogen as a raw material A, and mixing defective aniline and fresh aniline in proportion as a raw material B; (3) feeding the vaporized raw material B and the vaporized raw material A into a fixed bed reactor according to a certain hydrogen-oil ratio, and carrying out hydrogenation reaction; a hydrogenation reaction product is subjected to heat exchange condensation and then enters a gas-liquid separator for gas-liquid separation, a gas phase serves as recycle hydrogen to be mixed with the raw material A, and a liquid phase is fed into a distillation device; and 4) carrying out primary distillation and rectification purification in sequence to obtain cyclohexylamine and dicyclohexylamine. According to the method, aniline tail gas resources and defective aniline are fully utilized, the three-waste treatment cost is reduced, product benefits can be improved, pollution to the environment can be reduced, and economic benefits and social benefits are remarkable.

The invention relates to an iron-based catalyst for catalyzing CO2 hydrogenation to prepare low-carbon olefin and a preparation method thereof, and the preparation method comprises the following steps: preparing a zirconium oxide carrier, grinding ZrOCl2. 8H2O, calcining in a muffle furnace to obtain ZrO2, and grinding to obtain the zirconium oxide carrier; the preparation method comprises the following steps: respectively dissolving a Fe source, a Co source and a K source in water, adding the zirconia carrier, stirring and evaporating to obtain a suspension, drying the suspension, and calcining to obtain a FeCoK / ZrO2 catalyst; wherein in the FeCoK / ZrO2 catalyst, the loading capacity of Fe-Co is 12.2 wt%, the molar ratio of Co / (Fe + Co) is 0.15 to 2, and the molar ratio of K to Fe is 0.2 to 0.7. The FeCoK / ZrO2 catalyst prepared by the preparation method disclosed by the invention has a very high conversion rate on CO2 and selectivity on low-carbon olefins, optimizes the adsorption activation path on CO2, and has very good catalytic activity.

The invention discloses a method for electro-catalytic hydrogenation of lignin by using a Bi-(Et3N) catalyst, and belongs to the technical field of electro-catalytic hydrogenation of lignin. The method comprises the following steps: adding a Bi-(Et3N) catalyst and a lignin model compound into an H-shaped electrolytic cell, and carrying out electro-catalytic hydrogenation on the model compound under a constant current system. In the preparation process of the catalyst, the coordination environment of Bi < 3 + > species is changed by adjusting the use amount of triethylamine, so that controllable transformation between Bi (OH) 3 and Bi-(N-C) coordination structures is realized, a large number of lattice defects are further derived, the generation of the Bi-(N-C) structures induces the appearance of electron-deficient Bi species, and the yield of the catalyst is improved. The electrochemical hydrogenation catalyst shows excellent performance in electrochemical hydrogenation of lignin model compounds.

The invention belongs to the technical field of petroleum processing, and particularly relates to a catalyst and a preparation method and application thereof. The raw materials of the catalyst comprise a metal active component, a carrier and an auxiliary agent, the metal active component is sulfides of Mo and Ni elements, the carrier is spherical gamma-Al2O3 of 0.5-1 mm, and the auxiliary agent is P; the carrier is modified by using the metal active component and the auxiliary agent to serve as the catalyst. The high-activity catalyst is synthesized by adopting the strategy of changing the roasting temperature, adding the additive for doping modification and changing the molar ratio of metal active components, the additive is combined with surface aluminum atoms, the framework strength is enhanced, pore channel collapse caused by acid / water erosion is reduced, the water resistance and acid resistance of the catalyst are improved, and the catalytic reaction activity is further improved. The catalyst disclosed by the invention is accurate and controllable in structure, can be synthesized in batches, and can be applied to the co-catalytic hydrogenation process of biomass pyrolytic oil and / or a model compound thereof and petroleum distillate oil and / or VR.

The invention relates to the field of chemical engineering, in particular to an n-hexane separation technology, and more particularly relates to a method and a device for preparing electronic-grade n-hexane. The method for preparing the electron n-hexane comprises the following steps: S1, introducing an adsorbent into an n-hexane raw material to remove moisture in the n-hexane, and then carrying out catalytic hydrogenation reaction to obtain crude n-hexane; and S2, carrying out primary filtration on the material subjected to catalytic hydrogenation, then carrying out light component removal and heavy component removal two-stage rectification to obtain high-purity n-hexane, and carrying out secondary filtration on the high-purity n-hexane to obtain the electronic-grade n-hexane. The device for preparing the electronic-grade n-hexane comprises a raw material tank, an adsorption tower, a catalytic hydrogenation reactor, an intermediate tank, a light component removal tower, a heavy component removal tower and a product tank which are connected in sequence. According to the preparation method and device, high-purity electronic-grade n-hexane meeting the strict requirements of the semiconductor industry can be produced, the process steps are simple, industrial production is easy to achieve, the product quality is stable and reliable, and high economic and social benefits are achieved.

The invention discloses a Cu-metal phthalocyanine heterojunction catalyst, a preparation method thereof and application of the Cu-metal phthalocyanine heterojunction catalyst in preparation of 2, 5-furandimethanol through electro-catalytic hydrogenation of 5-hydroxymethylfurfural. A CuO nanowire is used as a carrier, metal phthalocyanine nanoparticles are effectively loaded through the coordination effect of 3, 4-dihydroxybenzonitrile by utilizing solvothermal reaction, and then the Cu and metal phthalocyanine heterojunction catalyst is prepared through electroreduction. The preparation method is simple, the raw materials are low in price, no precious metal is used, the production cost is effectively reduced, and the industrial application prospect is good; the catalyst has excellent electro-catalytic hydrogenation performance: at room temperature and normal pressure, the selectivity of 2, 5-furandimethanol can reach 100%, the conversion rate of 5-hydroxymethylfurfural reaches 95%, and the Faraday efficiency reaches 89%.

The present invention relates to a catalytically active material, the preparation thereof, and the use of the catalytically active material, e.g. in the catalytic oxidation of CO to CO2 or in the catalytic hydrogenation of alkyne. The catalytically active material comprises a support5 comprising a metal oxide, and atomically dispersed noble metal on the surface of the support, wherein the metal oxide is selected from TiO2, CeO2, ZnO, SnO2, Ga2O3, In2O3, ZrO2, and Fe2O3, the noble metal is selected from Pt, Pd, Rh, and Au, and the catalytically active material is obtainable by a method comprising a step of non-thermal plasma treatment in the presence of O2.

A method for continuously producing m-xylylenediamine belongs to the technical field of organic synthesis and comprises the following steps: (1) mixing isophthalonitrile, toluene and liquid ammonia according to a mass ratio of 1: (3-5): (13-17) in a nitrogen atmosphere to form a reaction mixture; (2) heating the interior of a reaction bed containing a catalyst to 90-95 DEG C, continuously introducing hydrogen into the reaction bed, introducing the reaction mixture after the pressure intensity of the reaction bed is stable, and carrying out a catalytic hydrogenation reaction to generate a reaction product; and (3) carrying out gas-liquid separation on the reaction product, removing liquid ammonia from the liquid-phase product through an ammonia distillation process, and separating toluene and m-xylylenediamine through a rectification process to obtain m-xylylenediamine. According to the method, isophthalonitrile and hydrogen are used as raw materials, liquid ammonia and methylbenzene are used as reaction solvents, the raw materials and the reaction solvents are heated to 90-95 DEG C under the catalytic action of a catalyst for an exothermic reaction, m-xylylenediamine is generated through the reaction, and the reaction yield is larger than 99%.

The invention provides a catalyst for preparing phenol through catalytic hydrogenation of guaiacol as well as a preparation method and application of the catalyst. The preparation method of the catalyst comprises the following steps: fully dissolving magnesium nitrate, P123 and urea in deionized water, carrying out hydrothermal reaction, filtering, washing, drying and roasting to obtain an MgO carrier; immersing the MgO carrier in an alkali metal nitrate aqueous solution, drying and roasting to obtain an alkali metal element loaded MgO carrier; the alkali metal is selected from one of Li, Na, K or Cs; and immersing the alkali metal element loaded MgO carrier in a methanol solution of chloroplatinic acid, removing methanol, drying, and then carrying out reduction treatment to obtain the catalyst. The catalyst disclosed by the invention is applied to catalytic hydrodeoxygenation of guaiacol and shows excellent catalytic performance, the hydrodeoxygenation reaction conditions are mild, and the target product phenol can be obtained with high selectivity and high yield.

The invention provides a preparation method and application of low-cost 1, 4-naphthalene diphenol and a polyaryletherketone homopolymer of the low-cost 1, 4-naphthalene diphenol. The method comprises the following steps: mixing 1, 4-naphthoquinone, a polar solvent and a catalyst to form a mixture; feeding the mixture into a micro-channel tubular reactor, and introducing hydrogen to carry out continuous catalytic hydrogenation reduction reaction; separating the catalyst to obtain a reaction solution containing 1, 4-naphthalene diphenol; adding a non-polar solvent into the reaction liquid for crystallization; and separating to obtain a 1, 4-naphthalene diphenol product. The product obtained by adopting the preparation method and the preparation system provided by the invention is high in purity, good in color, strong in stability and suitable for industrial production, a high-quality raw material is provided for subsequent synthesis of the 1, 4-naphthalene structure polyaryletherketone homopolymer, and smooth proceeding of a polymerization reaction and stability of product quality are ensured.

The invention discloses a resource regeneration method of waste lubricating oil, relates to the technical field of petrochemical engineering, and belongs to the patent classification number C10M175 / 06. The preparation method comprises the following steps: adding a composite flocculant into the waste lubricating oil, heating and stirring, and then carrying out magnetic separation to obtain pretreated waste lubricating oil; uniformly mixing the pretreated waste lubricating oil, glycerol and a Ni / Al2O3 catalyst, then heating and reacting under pressure, and cooling to room temperature to obtain a catalytic hydrogenation product; and carrying out reduced pressure distillation on the catalytic hydrogenation product, recovering the lubricant base oil fraction, adding methanol and concentrated sulfuric acid into the distillation residual liquid, heating for esterification reaction, and separating the liquid to obtain the biodiesel. In the pretreatment process, the composite flocculant is used for removing acid and particle impurities in the lubricating oil, a traditional alkali adding neutralization precipitation process is replaced, the method is environmentally friendly, and the recovery cost of enterprises is reduced.

The invention relates to the technical field of chemical engineering, and particularly discloses a palladium-carbon catalytic hydrogenation reaction material treatment system, which comprises a three-dimensional workshop structure, an air-operated hoist, an air supply system, an air supply system and an air supply system, wherein the top of the three-dimensional workshop structure is provided with an elevator and a hoisting ton bag; the palladium-carbon circulating unit comprises a palladium-carbon preparation kettle, a hydrogenation reaction kettle, a decarbonization filter, a filter pressing cylinder, a sample splitter and a glove box which are connected in sequence, and the sample splitter is connected back to the palladium-carbon preparation kettle through a closed pipeline; the solid feeding unit comprises a ton bag feeder, a pneumatic valve and a spiral conveying pipe, and the tail end of the solid feeding unit is connected with a top feeding hole of the hydrogenation reaction kettle; the gas supply system comprises a hydrogen cylinder group and is connected to a gas distributor at the bottom of the hydrogenation reaction kettle through a pressure reducing valve and a flow regulating valve; through the multi-stage separation design and the safety interlocking mechanism of the palladium-carbon circulating unit, the recovery rate of the catalyst is increased, meanwhile, the pressure, temperature and stirring state are monitored in real time to trigger nitrogen purging or pressure relief, and the risks of hydrogen leakage and reaction out-of-control are reduced in combination with inert gas protection of the glove box.

The invention discloses a bimetallic MOFs mediated morphology-controllable catalyst, a preparation method and application thereof, and the preparation method comprises the following steps: respectively adding an iron salt, a cobalt salt and an organic ligand into an organic solvent, and then adding an alkaline regulator and a surfactant; transferring the stirred solution into a reaction kettle to carry out solvothermal reaction, and centrifuging, washing and drying the suspension after the reaction to obtain a bimetal organic framework (MOFs) precursor; and carrying out heat treatment in a gas atmosphere to obtain the catalyst. The bimetallic MOFs are obtained through a one-step solvothermal method, the size and morphology of the product are regulated through the alkaline regulator, agglomeration of catalyst nanoparticles can be reduced by adding the surfactant, the preparation method is simple, the specific surface area of the product is high, and when the catalyst is used for preparing high-carbon hydrocarbon through catalytic hydrogenation of carbon dioxide, the yield of the product is high. The conversion rate of carbon dioxide reaches up to 47.82%, the selectivity of high-carbon hydrocarbon reaches 59.68%, the selectivity of by-products carbon monoxide and methane is low, and the catalytic activity is good.

The invention discloses a catalyst and method for preparing 3-methyl-2-aminobenzoic acid through continuous catalytic hydrogenation, and the method comprises the following steps: pretreating an activated carbon carrier by using pretreatment reagents such as nitric acid and hydrogen peroxide to remove impurities in the carrier; modifying the carrier by using an auxiliary component 1 such as sodium carbonate, stannic chloride, potassium carbonate and lanthanum nitrate, and then roasting and reaming; and finally, active components such as platinum chloride and palladium chloride are mixed and impregnated with an auxiliary component 2 such as oxalic acid, polyethylene glycol-400, sodium metavanadate and polyvinylpyrrolidone, the auxiliary component 2 promotes dispersion of the active metal, and the auxiliary component 2 and the auxiliary component 1 have a synergistic effect, so that the active metal is loaded more uniformly and firmly, and the obtained catalyst has higher activity and selectivity and longer service life. The catalyst is applied to preparation of 3-methyl-2-aminobenzoic acid through catalytic hydrogenation in a fixed bed reactor, the reaction can be continuously and automatically controlled, the three wastes in the reaction process are few, the yield of a target product is high, the service life of the catalyst is long, and the catalyst is suitable for industrial production.

The invention relates to the technical field of power cables, and provides a marine power cable which comprises a conductor, an insulating layer, an armor layer and a sheath layer are sequentially arranged on the outer side of the conductor, and the sheath layer is prepared from, by weight, 40-50 parts of polyethylene, 35-45 parts of methyl vinyl silicone rubber, 30-40 parts of nitrile rubber, 8-10 parts of plasticizer, 40-60 parts of filler, 1-2 parts of antioxidant and 1-3 parts of vulcanizing agent; the nitrile rubber is composed of nitrile rubber A, nitrile rubber B and nitrile rubber C, and the nitrile rubber A, nitrile rubber B and nitrile rubber C have different molecular structures; the nitrile rubber A is obtained by polymerizing butadiene and acrylonitrile; the nitrile rubber B is obtained by catalytic hydrogenation of nitrile rubber; and the nitrile rubber C is obtained by ternary polymerization of butadiene, acrylonitrile and organic acid. According to the technical scheme, the problem of poor corrosion resistance of the marine power cable in the prior art is solved.

The invention discloses a preparation method of a cobalt-molybdenum catalyst and application of the cobalt-molybdenum catalyst in preparation of methyl mercaptan through CO2 / H2S hydrogenation. According to the method, a titanium source is used as a modification additive, ethanol is used as a structure-directing agent, a hydrotalcite-like precursor with a sheet-like characteristic is synthesized by a simple hydrothermal method, and an active component is further loaded on the basis, so that the cobalt-molybdenum catalyst with high dispersion and rich vacancies is finally obtained. The titanium source is added, so that the density of electron cloud around the active component is increased, transferred electrons promote the strength of Mo-S bonds and Co-S bonds to be reduced, the Mo-S bonds and the Co-S bonds are easier to break to form sulfur defects, and adsorption and activation of CO2 and H2S are promoted. Meanwhile, due to injection of extra charges, MoS2 is induced to generate phase change from a 2H phase to a 1T phase, and the catalytic hydrogenation capacity of MoS2 in the reaction process is improved. Finally, the cobalt-molybdenum catalyst shows considerable catalytic activity in a reaction system for preparing methyl mercaptan through CO2 / H2S hydrogenation.

The invention relates to a method for preparing a nerofloxacin chiral piperidylamine intermediate, which comprises the following steps of: carrying out condensation reaction on 5-hydroxy nicotinic acid which is simple and easy to obtain and is used as a raw material and different alcohols, screening through a series of asymmetric catalytic hydrogenation conditions to obtain optimal reaction conditions, and under the conditions, carrying out reaction on various 3, 3 '-dihydroxy nicotinic acid and 3, 3'-dihydroxy nicotinic acid to obtain the nerofloxacin chiral piperidylamine intermediate. The 2, 5-disubstituted pyridine quaternary ammonium salt is reduced into a tetrahydropyridine product, and the C5 site enantioselectivity of the product is excellent. The preparation method comprises the following steps: selecting methyl (R)-1-benzyl-5-hydroxy-1, 4, 5, 6-tetrahydropyridine-3-carboxylic acid methyl ester as a substrate, completely hydrogenating by using platinum dioxide hydrogen, and then carrying out methyl ester reduction, dehydroxylation, Mitsunobu reaction and protecting group removal to obtain a key chiral intermediate for industrial synthesis of a quinolone antibacterial drug nemonofloxacin with high enantioselectivity and high yield.

The utility model discloses a catalytic hydrogenation reactor for treating a biomass raw material with a high acid value and a high iodine value, and belongs to the technical field of oil product hydrogenation. The catalytic hydrogenation reactor comprises a reactor pressure-bearing container, an inner cylinder, an ash discharge port, a feeding assembly, a reaction assembly and a discharging assembly, the inner cylinder is arranged in the reactor pressure-bearing container, the feeding assembly and the reaction assembly are arranged in the inner cylinder, the reaction assembly comprises a ceramic tube bundle internal part, the discharging assembly is arranged above the inner cylinder, and the discharging assembly is arranged above the inner cylinder. The ash discharge port is formed in the center of the bottom of the reactor pressure-bearing container. By arranging the ceramic tube bundle internal part in the catalytic hydrogenation reactor, on one hand, the ceramic tube bundle internal part serves as a reaction assembly and has certain acid corrosion resistance, and on the other hand, the ceramic tube bundle internal part serves as a solid catalyst carrier, selective hydrogenation of high-acid-value and high-iodine-value biomass raw materials is achieved, the iodine value is effectively reduced, and coking of the high-iodine-value biomass raw materials in the reaction process is avoided; in addition, the acid value is maintained as far as possible while the iodine value is reduced, and the solid catalyst and the catalytic hydrogenation reactor are not corroded, so that the stability of the solid catalyst and the yield of the product are improved.

The invention discloses an electro-catalysis method of Pickering emulsion for nitro compound hydrogenation, and relates to the technical field of catalytic hydrogenation, the Pickering emulsion is composed of an oil phase, a water phase and a platinum-loaded hydrophilic carbon nanotube catalyst; wherein based on the weight of the carbon nanotubes in the catalyst, the platinum accounts for 5.0 wt%-10.0 wt%; in the emulsion system, the particle concentration of the platinum-loaded hydrophilic carbon nanotube catalyst is 0.05 wt%-10 wt%; in the emulsion system, the hydrophilic carbon nanotubes have certain hydrophilicity and can be well dispersed in a water phase. According to the Pickering emulsion electro-catalysis method for nitro-compound hydrogenation, in a platinum-loaded hydrophilic carbon nanotube catalyst, the hydrogenation reaction of the nitro-compound can be effectively catalyzed when platinum is in a specific proportion range of 5.0 wt%-10.0 wt%.

The invention discloses a magnetically separable reversed-phase catalyst, a preparation method thereof and application of the magnetically separable reversed-phase catalyst in hydrogenation upgrading recovery of aromatic polyester, and belongs to the technical field of reversed-phase catalysts and plastic recovery. The catalyst is formed by loading a metal oxide (MOx) on a metal carrier nickel, and is applied to hydrogenation recovery of aromatic polyester and conversion of aromatic polyester into high value-added aliphatic polyester. After dispersion, carrying out catalytic hydrogenation reaction on the aromatic polyester at a set temperature, a set rotating speed and a set hydrogen pressure, and completing conversion of the aromatic polyester after the reaction reaches a set time; according to the method, the aromatic polyester is completely converted into the fat polyester with high additional value by using the cheap and easily-separated reverse catalyst, so that the upgraded recycling of the polyester waste plastic is realized.

The present invention designs a method for preparing a key intermediate of synthetic boceprevir, namely a chiral pyrrolidone derivative, through catalytic hydrogenation. Specifically, it involves the use of substrate chiral induction by adjusting and modifying the substituents of the substrate to achieve the asymmetric catalytic hydrogenation of dihydropyrrolidone by a metal catalyst. The advantages of the present invention are that the process route is simple and feasible, the yield is high, the cost is low, and it is easy to industrialize production, etc.

The invention discloses a preparation method and application of an oil-soluble heteropolyacid ionic liquid catalyst. The catalyst is composed of organic cations and inorganic anions, the cations are one of quaternary ammonium, imidazole and pyridine cations containing long-chain alkyl, the anions are heteropolyacid anions, the long-chain alkyl enables the catalyst to have good oil solubility, the catalyst can be efficiently dispersed in the waste grease, heteropolyacid provides active sites, and the catalyst can be used for treating the waste grease. Nano-scale active particles are formed after in-situ vulcanization, and the catalytic hydrogenation effect is achieved. The invention also provides a preparation method of the oil-soluble heteropolyacid ionic liquid catalyst, the catalyst can be prepared from tertiary amine and halogenated hydrocarbon through three-step reaction of alkylation, anion exchange and acid-base neutralization, the preparation process is simple, a highly toxic reagent is avoided, and the cost is low. The catalyst provided by the invention can be used for catalytic hydroisomerization of various waste oils and fats, has the characteristics of high conversion rate, low coking rate and high product calorific value, and has relatively high industrial application potential.

The invention discloses a catalyst for preparing formic acid through thermocatalysis CO2 hydrogenation and a preparation method and application of the catalyst in a reaction for preparing formic acid through thermocatalysis CO2 hydrogenation, the catalyst comprises an active component and a carrier for bearing the active component, the active component is a transition metal monatomic atom, the carrier is modified by an organic ligand in advance, and the organic ligand is a transition metal monatomic atom. One end of the organic ligand is uniformly grafted on the surface of the carrier, and the other end of the organic ligand is coordinated with a transition metal single atom. The preparation method of the catalyst is simple, expensive ligands do not need to be used, and the cost is low; the transition metal in the catalyst is in a monatomic dispersed state, and the utilization rate of the metal is high. The prepared catalyst shows good catalytic activity on a reaction for preparing formic acid through thermocatalytic CO2 hydrogenation under the condition that an organic solvent is not used; the catalyst even can thermocatalyze CO2 hydrogenation in a water phase to prepare formic acid under the condition of not adding alkali.

The invention discloses a nitrogen-doped carbon-coated catalyst and a preparation method and application thereof, and the preparation method of the nitrogen-doped carbon-coated catalyst comprises the following steps: 1, dissolving anhydrous zinc chloride in a solvent, and adjusting the pH value of the mixed solution to 9.5-11.5; adding 1H-1, 2, 3-triazole, and stirring at room temperature, so as to obtain an MET-Zn precursor; 2, respectively dissolving the MET-Zn precursor and Fe, Co or Ni metal nitrate in a solvent, then mixing the two solutions, and carrying out ion exchange under the protection of nitrogen to obtain an M-MET precursor subjected to ion exchange; and 3, carbonizing the M-MET precursor subjected to ion exchange in an inert atmosphere to obtain the nitrogen-doped carbon-coated catalyst. The invention provides an application of the nitrogen-doped carbon-coated catalyst in a liquid-phase catalytic hydrogenation reaction of o-chloronitrobenzene. The nitrogen-doped carbon-coated catalyst has the characteristics of high catalytic activity, selectivity and stability and capability of being magnetically recycled.

The invention relates to a preparation method of a carbon-based gold-containing bimetallic catalyst. The specific method comprises the following steps: carrying out secondary doping on eigenstate polyaniline, carrying out high-temperature pyrolysis in an inert atmosphere to obtain a heteroatom-doped carbon-based carrier, and changing the variety, the content and the distribution of heteroatoms on the carbon surface of the carrier by adjusting the variety and the content of acid. And preparing gold-containing bimetallic nanoparticles by using a colloid method, and depositing bimetallic particles by virtue of adsorption of the carbon carrier and bimetallic to obtain the carbon-based gold-containing bimetallic catalyst. Wherein the doping element can anchor and disperse the noble metal, and the introduced second metal can improve the hydrogenation activity of the catalyst. The catalyst is simple in preparation process, good in activity, excellent in selectivity and excellent in cycling stability, is particularly suitable for a reaction for preparing 4-chloroaniline through catalytic hydrogenation of 4-chloronitrobenzene, and has good application potential.

The invention provides a silver-cobalt-silicon catalyst for synthesizing ethanol and ethylene glycol through catalytic hydrogenation of dimethyl oxalate and a preparation method of the silver-cobalt-silicon catalyst. The preparation method comprises the following steps: firstly, taking alkaline silica sol as a silicon source, taking soluble cobalt salt as a cobalt source, synthesizing a precursor of cobaltous silicate through an ammonia distillation method, then taking soluble silver salt as a silver source, and introducing a silver element into a cobaltous silicate layer through an impregnation method or the ammonia distillation method to prepare the silver-cobalt-silicon sphere catalyst through a synthesis method. The catalyst has high activity and high stability at a low reaction temperature. According to the novel silver-cobalt-silicon catalyst, the conversion rate of dimethyl oxalate can reach 99.9% in a wide temperature range, ethanol and ethylene glycol products with different proportions can be obtained at different temperatures, the total selectivity of ethanol and ethylene glycol reaches or exceeds 90%, and the novel silver-cobalt-silicon catalyst is suitable for producing ethanol and ethylene glycol products with different proportions according to different requirements.

The invention discloses a production method of HMDA (4, 4 '-MDA), which comprises a process of pretreating a catalyst before a catalytic hydrogenation reaction of 4, 4'-MDA, the pretreatment method of the catalyst comprises the following steps: mixing the catalyst, a solvent and a heavy component-reaction regulator, treating for a period of time in a high-temperature hydrogen atmosphere, filtering out the catalyst after the treatment is finished, and carrying out a subsequent catalytic hydrogenation reaction; the heavy component, namely the trans regulator, is cis-1, 4-di (aminomethyl) cyclohexane; preferably, the addition amount of the heavy component, namely the anti-reaction regulator, is 0.1-15 wt% of the mass of the catalyst. The yield of the H12MDA exceeds 95%, the trans-trans isomer content is 13-15%, no heavy components are generated, the unit consumption of the raw materials is greatly reduced, and the catalyst is not inactivated after being used for 60 batches.

The invention relates to a catalyst for preparing 1, 4-cyclohexanedimethanol (CHDM) by catalyzing dimethyl terephthalate (DMT) hydrogenation and a preparation method thereof, non-noble metals nickel (Ni) and copper (Cu) are used as active components, silicon dioxide is used as a carrier, ammonia water in a solution is evaporated out after ammonia water precipitation, and a catalyst sample is obtained. The active components mainly adopt metal Ni and Cu elements with relatively low price, compared with noble metals such as ruthenium, rhodium, platinum and the like, the use cost of the catalyst is greatly reduced, the bimetallic catalyst Ni-Cu-SiO2 is prepared by an ammonia distillation method, 1, 4-cyclohexanedimethanol can be prepared by catalyzing dimethyl terephthalate hydrogenation by a one-pot method, and the catalyst has a wide application prospect. The preparation cost of the catalyst is relatively low, the dispersity and stability of the catalyst are improved by adopting an ammonia distillation method, the CHDM is prepared by adopting a one-pot method, the energy consumption is further reduced, the reaction procedure is simplified, and the preparation method is simple and is easy to amplify to industrial production.