958 results about "Palladium catalyst" patented technology

The invention relates to the technical field of organic synthesis, in particular to a method for constructing Orforglipron pyran ring chirality through enzyme catalysis, which comprises the following steps: step S1, taking SM1 and SM2 as raw materials, and reacting under the action of a palladium catalyst and a ligand to obtain INT-1; step S2; carrying out hydrogenation reduction on double bonds of the INT-1 under the catalysis of Pd / C to obtain INT-2; s3, carrying out hydrolysis resolution on the INT-2 in a solvent, a buffer salt system and enzyme catalysis to obtain a chiral pure intermediate INT-3; step S4, performing ring closing on the INT-3 through a Grignard reaction to synthesize a lactone intermediate INT-4; and S5, carrying out Diball-H reduction, quenching, dichloromethane extraction and anhydrous sodium sulfate drying on the INT-4, and then reducing by using triethyl silane to obtain the compound with the general formula A. Chirality is constructed through enzyme catalysis, isomer impurities do not need to be split and separated through SFC when the chirality is constructed, loss is reduced, the yield is increased, and a target product is obtained with high yield and high chiral selectivity; meanwhile, the cost is relatively reduced, and the cost is saved.

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of 3, 4 '-diaminodiphenyl ether.The preparation method comprises the steps that m-dinitrobenzene is dissolved with alcohol, and selective hydrogenation is conducted in a high-temperature and high-pressure reaction kettle with a palladium catalyst; and co-heating and refluxing the product after selective hydrogenation, a strong alkali aqueous solution, a first solvent and a phase transfer catalyst to obtain the m-aminophenol salt. M-aminophenol salt, p-nitroiodobenzene, alkali and a second solvent are subjected to a co-heating reaction, and then 3-amino-4 '-nitrodiphenyl ether is obtained through post-treatment; the method comprises the following steps: dissolving 3-amino-4 '-nitrodiphenyl ether with alcohol, carrying out hydrogenation reduction with a palladium catalyst, and carrying out post-treatment purification to obtain 3, 4'-diaminodiphenyl ether. According to the method, common m-dinitrobenzene is used as a raw material, m-nitroaniline is obtained through selective hydrogenation, m-aminophenol salt is prepared through the m-nitroaniline, then etherification reaction is carried out, the reaction yield is higher, the purity is better, and side reactions are few.

The invention discloses a method for preparing a graphdiynyl material based on a Sonogashira-Hagihara cross-coupling reaction, and belongs to the technical field of Sonogashira-Hagihara cross-coupling Reaction. According to the method, halogenated aromatic hydrocarbon and an alkynyl compound are used as raw materials, a palladium catalyst / copper catalyst is used as a catalytic system, and the graphdiynyl material is prepared by regulating the alkalinity and the polarity of a solvent. According to the present invention, the graphitized alkynyl material is obtained through the in-situ removal of the protection group on the acetylenic bond of the alkynyl compound and the Sonogashira-Hagihara cross coupling with the halogenated aromatic hydrocarbon, such that the method can select the variety of the halogenated aromatic hydrocarbon, the cost is low, the side reaction during the polymerization process is less, the variety of the graphitized alkynyl can be easily expanded, the development and the utilization of the high-quality graphitized alkynyl film can be easily achieved, and the method can be used for the preparation of the graphitized alkynyl material. The preparation cost of graphdiyne is reduced.

The invention discloses a polyethylene glycol-poly (2-vinyl) ethylene glycol copolymer and a preparation method thereof, and relates to the technical field of high polymer materials, and the structure of the polyethylene glycol-poly (2-vinyl) ethylene glycol copolymer is selected from any one of the following structural formulas: # imgabs0. The preparation method comprises the following steps: taking hydroxyl-containing polyethylene glycol and 4-vinyl-1, 3-dioxocyclopent-2-ketone or vinyl ethylene oxide as raw materials; under the action of a palladium catalyst and a phosphine ligand, the polyethylene glycol-poly (2-vinyl) glycol copolymer is efficiently prepared and can be used in the fields of hydrophilic / hydrophobic materials, drug carriers, antibacterial materials, phase change materials, shape memory materials and the like.

The invention belongs to the technical field of catalytic oxidation of carbon-containing industrial waste gas, and particularly relates to a Pd catalyst for catalytic combustion of carbon-containing waste gas as well as a preparation method and application of the Pd catalyst. The invention provides a Pd catalyst for catalytic oxidation of carbon-containing industrial waste gas such as CO and volatile organic pollutants VOCs. The Pd catalyst is obtained by compounding an amorphous CeO2 nano-cluster with a TiO2 substrate (marked as cCeO2 / TiO2) and indirectly regulating the form of Pd through gradient regulation of the content of the amorphous CeO2 nano-cluster by a sol-gel method on the basis of strong interaction of Pd and Ce species. The Pd catalyst prepared by the invention shows excellent low ignition temperature, high performance and certain universality in the catalytic combustion process of carbon-containing industrial waste gases such as CO and low-chain VOCs (Volatile Organic Compounds). In addition, the method for preparing the Pd catalyst is simple to operate and mild in condition, and has great industrial application potential and value.

The invention relates to the technical field of hydrogen production equipment, in particular to a hydrogen preparation and purification device and method. According to the hydrogen preparation and purification device, by arranging the deaerator, the pre-drying tower, the first drying tower, the second drying tower, the condenser, the flow regulator, the regeneration gas heater, the regeneration gas condenser and the multiple control valves, heating adsorption and condensation adsorption of hydrogen are achieved, hydrogen consumption is effectively reduced, and the good purification effect of hydrogen is guaranteed; as the hydrogen obtained by water electrolysis is pure and has low impurity content, the process route of removing impurity oxygen by adopting the hydrogen under the catalytic action of the palladium catalyst and then carrying out temperature swing adsorption dehydration by adopting the activated aluminum oxide and molecular sieve composite bed layer is reasonable, the process flow is simple, the energy consumption is low, and for small and medium-sized purification devices, system integration and skid-mounting are easy, and the cost is low. And the method can be widely applied to various industrial fields.

The invention discloses a polyarylamine hole transport material, a synthesis method thereof and a perovskite solar cell, and belongs to the field of chemical and energy materials. The synthesis method comprises the following steps: mixing arylamine, aryl halide, a palladium catalyst, a phosphine ligand and organic alkali, carrying out a reflux reaction, and then adding an end-capping reagent to terminate the reaction; and settling the product in methanol, carrying out suction filtration to obtain a solid, and then carrying out Soxhlet extraction. By adjusting the activity of the reaction intermediate, two continuous C-N cross-coupling catalytic cycles are achieved, in the first catalytic cycle, high-reaction-activity arylamine and aromatic halide are coupled to generate a low-activity bifunctional secondary arylamine intermediate, the intermediate is kept in a dormant state in the first catalytic cycle, and after primary arylamine is completely consumed, the intermediate is separated from the primary arylamine, and the secondary arylamine is separated from the primary arylamine. And the secondary arylamine intermediate and the aromatic halide are subjected to coupling polymerization, so that accurate synthesis of a series of polyarylamine with narrow molecular weight distribution is realized. The polyarylamine can be used as a hole transport material to construct a perovskite solar cell, adjust interface hole extraction and promote perovskite growth.

The invention relates to a method for preparing cyclohexanone by conversion of acetone and 1, 3-propylene glycol, and belongs to the technical field of chemical engineering. The method comprises the following steps: catalyzing a dialkylation reaction of acetone and 1, 3-propylene glycol by virtue of a supported nickel or palladium catalyst and a potassium phosphate cocatalyst, and removing water from acetone and 1, 3-propylene glycol which are equal in molar weight, so as to obtain cyclohexanone. The method contributes to the production of bulk chemicals and fine chemicals by a fermentation method, and makes a contribution to the strategic goal of low-carbon development.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method of a palladium catalyst for hydrogen peroxide production by an anthraquinone process, which comprises the following steps: at a certain temperature, alumina powder is impregnated in a palladium salt solution for equivalent-volume impregnation for a certain time, and alumina comprises gamma-Al2O3 and alpha-Al2O3; after impregnation is completed, deionized water is added into the solid, chloride ions are removed through electro-adsorption after ultrasonic treatment, and then a filter cake is obtained through filtering; according to the preparation method of the palladium catalyst, the aluminum oxide with the crystal phase in the specific proportion is matched with the ultrasonic treatment and the electro-adsorption method, the prepared catalyst has the advantages of being high in selectivity, good in catalytic activity and mechanical property and stable in product quality, chloride ions are easy to remove, and waste of a large number of water resources is avoided.

The invention discloses a palladium catalyst as well as a preparation method and application thereof. The structural formula of the palladium catalyst is shown as a formula (I), according to the invention, an alkoxy group is introduced into the skeleton of the palladium catalyst and N-methylimidazole is coordinated with palladium, so that the catalytic yield of the palladium catalyst is effectively improved, and long-chain alkyl polyarylamine with high molecular weight and narrow distribution is obtained; the method does not need to use a traditional phosphine ligand, avoids potential hazards of phosphine compounds to operators and the environment in the use process, and is expected to be industrially applied on a large scale due to the fact that the phosphine compounds are stable to air and moisture and can be stored for a long time.

The invention belongs to the field of preparation of halogen-containing substituted benzoic acid, and particularly relates to a method for preparing o-chlorobenzoic acid through hydrogenation selective debromination. According to the invention, hydrogen is used as a reducing agent, a palladium catalyst is used as a catalyst, a methanol aqueous solution is used as a solvent, and 2-chloro-3-bromobenzoic acid, 2-chloro-5-bromobenzoic acid or a mixture thereof are used as raw materials to prepare o-chlorobenzoic acid. According to the method, debromination is controlled through selective hydrogenation instead of dechlorination, so that generation of a byproduct benzoic acid is inhibited. The scheme is reasonable in design, simple in process and mild in reaction condition, and a new thought is provided for the synthesis method of o-chlorobenzoic acid.

The invention provides a composite carrier supported palladium catalyst for preparing succinic anhydride through maleic anhydride hydrogenation and a preparation method and application thereof.The structural general formula of the composite carrier supported palladium catalyst is Pd-A-X-Y / (Z1 + Z2), Z1 in a composite carrier is made of a high-specific-surface-area porous material, Z2 is made of a high-thermal-conductivity compact material, and X is larger than or equal to 1 and smaller than or equal to 2. The active component is composed of metal Pd and transition metal such as Ni or precious metal such as Ru, and the auxiliary agent is composed of oxides of alkali metal, alkaline earth metal or rare earth elements and oxides of high-valence elements such as Mo. The catalyst is prepared by an impregnation method, and the composite carrier supported palladium catalyst has excellent low-temperature activity, tolerance and stability in a reaction for preparing succinic anhydride by maleic anhydride hydrogenation, can bear high maleic anhydride concentration and high liquid hourly space velocity at low temperature, low pressure and low hydrogen-anhydride ratio, and simultaneously obtains high maleic anhydride conversion rate and succinic anhydride selectivity.

The invention discloses a preparation method of bepiridic acid, and belongs to the technical field of organic synthesis. The method comprises the following steps: by taking acetone and 4-chlorobutanol as raw materials, generating 1, 9-dichloro-5-carbonyl nonane under the action of a palladium catalyst, nickel bromide, TMEDA and alkali; the preparation method comprises the following steps: carrying out carbonyl protection on 1, 9-dichloro-5-carbonyl nonane, carrying out a reaction on the 1, 9-dichloro-5-carbonyl nonane and 2-methylpropionitrile by using a lithium reagent, and carrying out nitrile group hydrolysis and deprotection to generate 8-carbonyl-2, 2, 14, 14-tetramethyl pentadecanedioic acid; and reducing the 2, 8-carbonyl-2, 2, 14, 14-tetramethyl pentadecanedioic acid to generate a target product, i.e., the bepidioic acid. The route is overall reasonable and is carried out in five steps, 1, 9-dichloro-5-carbonyl nonane is generated through key acetone and 4-chlorobutanol under the combined action of the palladium catalyst and the nickel catalyst, the reaction yield is high, and a concise, effective and brand-new route is provided for preparation of bepiridic acid.

The invention provides a synthesis method of 4-fluoro-2-trifluoromethyl acetophenone, which comprises the following steps: under protective gas, firstly adding a metal palladium catalyst, a ligand, alkali, an organic solvent, 2-bromo-4-fluorine-trifluorotoluene and methylboronic acid into a reactor, then introducing carbon monoxide gas into the reactor, raising the pressure of the reactor, and reacting for 2-4 hours at the temperature of between 20 and 30 DEG C; and heating and stirring until the reaction is complete, and carrying out post-treatment to obtain the product 4-fluoro-2-trifluoromethyl acetophenone. According to the method, the 4-fluoro-2-trifluoromethyl acetophenone is synthesized through the one-pot reaction of the 2-bromo-4-fluoro-trifluorotoluene and the methylboronic acid under the catalysis of the metal palladium catalyst, the reaction method is easy and convenient to operate, the target product can be efficiently synthesized only through one-step reaction, no waste water is generated in treatment after the reaction, and the method is green and environmentally friendly.

The invention relates to the field of wave-absorbing materials, in particular to a novel aza conjugated microporous polymer wave-absorbing material and a preparation method of the novel aza conjugated microporous polymer wave-absorbing material. The conjugated microporous polymer is prepared from a dibromopyridine monomer and a borate monomer through Suzuki coupling reaction under the action of a palladium catalyst, and the polypyrrole-aza conjugated microporous polymer material with a net structure is obtained through confinement polymerization of polypyrrole in holes of the conjugated microporous polymer. According to the preparation method, a conjugated microporous polymer containing pyridine groups is synthesized through a molecular design strategy of introducing nitrogen heterocyclic rings on a conjugated microporous molecular skeleton, and polypyrrole is introduced into nanopores of the conjugated microporous polymer through a confinement polymerization method, so that the novel nitrogen heterocyclic conjugated microporous polymer wave-absorbing material is prepared. The wave-absorbing characteristic of the wave-absorbing material is obviously improved.

The present invention relates to the field of catalysis and, more particularly, to methods for recovering palladium in a form of a homogeneous palladium complex of formula (I) from a reaction mixture comprising a homogeneous palladium complex.

The invention discloses a palladium-cobalt bimetallic catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a zinc salt and a cobalt salt in an organic solvent to obtain a metal solution, dissolving a ligand in the organic solvent to obtain a ligand solution, and mixing the metal solution and the ligand solution for reaction to obtain Co-ZIF-8; the method comprises the following steps: dissolving Co-ZIF-8 in an organic solvent, adding a palladium salt solution, and reacting to obtain Pd / Co-ZIF-8; the Pd / Co-ZIF-8 is subjected to calcination treatment, and the palladium-cobalt bimetallic catalyst is obtained. According to the palladium-cobalt bimetallic catalyst provided by the invention, the cobalt-containing metal organic framework is adopted to load palladium nanoparticles, and after calcination, the catalyst has relatively strong magnetism and can be well separated after reaction; compared with a single-palladium catalyst, the catalyst has the advantages of higher catalytic activity, better selectivity and lower loading capacity, and can be used for synthesizing glycerol carbonate.

The present invention relates to the technical field of organic synthesis, and specifically relates to a method for constructing the chirality of a pyran ring in Orforglipron by means of enzymatic catalysis, the method comprising the following steps: step S1, by using SM1 and SM2 as starting materials, carrying out a reaction under the action of a palladium catalyst and a ligand to obtain INT-1; step S2, under the catalysis of Pd / C, subjecting INT-1 to double bond hydrogenation reduction to obtain INT-2; step S3, in the presence of a solvent, a buffer salt system and enzymatic catalysis, subjecting INT-2 to hydrolysis and resolution to obtain a chirally pure intermediate INT-3; step S4, subjecting INT-3 to a Grignard reaction for cyclization, so as to synthesize a lactone intermediate INT-4; and step S5, subjecting INT-4 to reduction by means of Dibal-H, quenching same, performing extraction with dichloromethane, drying same with anhydrous sodium sulfate, and then performing reduction by means of triethylsilane to obtain a compound of general formula A. In the present invention, the chirality is constructed by means of enzymatic catalysis without the need of SFC resolution for separating isomeric impurities during the construction of the chirality, thereby reducing losses and improving yield, obtaining the target product at high yield and high chiral selectivity, and further saving expenses and reducing costs.

The invention discloses a hydrogen-fluorine atom doped graphdiyne material and a preparation method thereof, and relates to the technical field of carbon materials. According to the method, halogenated aromatic hydrocarbon and an alkynyl compound are taken as raw materials, a palladium catalyst and a copper catalyst are taken as a catalytic system, and an acetylenic bond of the alkynyl compound and the halogenated aromatic hydrocarbon are subjected to a Sonogashira coupling reaction to obtain the hydrogen-fluorine-doped graphite alkynyl material. The graphdiyne material provided by the invention has a large pore diameter, multiple active sites and high thermal stability and chemical stability, so that the hydrofluorine-doped graphdiyne material has excellent electrochemical energy storage property, shows reversible capacity of 1155mAh g <-1 > under 0.05 Ag <-1 > when being used as a negative electrode of a lithium ion battery, and can be used as a negative electrode of the lithium ion battery. And the density is almost 3 times that of a commercial graphite negative electrode material (300-350mAh g <-1 >). The application of the graphdiyne material in the field of electrochemical energy storage is obviously promoted.

The invention provides a catalyst as well as a preparation method and application thereof and a preparation method of tetrahydrofurfuryl alcohol, the catalyst takes mesoporous silica as a carrier, the surface of the carrier is modified with polyethylene glycol and an alkyl chain to form an amphiphilic surface, and Pd nanoparticles are loaded in mesopores. The surface of the mesoporous silica supported palladium catalyst is modified with polyethylene glycol and alkyl chains through covalent bonds to form an amphiphilic interface, hydrophilic polyethylene glycol chains enrich furfuryl alcohol molecules through hydrogen bonds, and hydrophobic alkyl chains capture hydrogen microbubbles, so that the gas-liquid interfacial tension can be effectively reduced, large bubbles can be broken, and nano bubbles can stably exist; and the preparation of tetrahydrofurfuryl alcohol realizes efficient reaction under obviously reduced pressure.

The invention discloses a method for synthesizing tazobactam, which comprises the following steps: taking sulbactam as a starting material, and carrying out one-step coupling reaction on sulbactam and 1R-1, 2, 3-triazole under the action of a palladium catalyst, a proline ligand, alkali, an oxidizing agent and a corresponding solvent to obtain the tazobactam. The synthesis method is high in yield, low in cost and environment-friendly, and the synthesis process of tazobactam is greatly simplified.

This scheme belongs to the field of organic synthesis technology, discloses the synthesis method of anticancer medicine darolutamide, and the synthesis method designs a new synthesis route: using formula (S1) compound as starting material, first converted into formula (1ab) or formula (1ac) compound, and then converted into formula (TM-1) compound; the obtained formula (TM-1) compound reacts with formula (1ad) or formula (1ae) compound converted from formula (S5) compound to synthesize formula (TM-2) compound, and then converted into formula (TM-3 compound); the obtained formula (TM-3) compound reacts with formula (S6) compound to synthesize formula (TM-4) compound, and then converted into formula (TM-5) darolutamide. The synthesis process does not need to use expensive palladium catalysts or ligands, so there is no problem of heavy metal residues or heavy metal toxicity in the drug product caused by palladium catalysts in the pharmaceutical process, and there is no need to remove trace metal residues from the target product; the raw materials used are cheap and easy to obtain, the reaction system is green and environmentally friendly, simple to handle, high yield, and good purity.

The application discloses an emulsion microreactor for cascade reaction and a preparation method and application thereof. The emulsion microreactor is prepared by the following steps: acidolysis of agar, hydrophobic modification, mixing of obtained interface stable modified agar nanoparticles, enzymes and buffer to obtain an aqueous phase; mixing of a substrate, a catalyst and an organic solvent to obtain an oil phase; and mixing of the aqueous phase and the oil phase to obtain the emulsion microreactor. The emulsion microreactor is used for synthesizing 4-biphenylcarboxylic acid ethyl ester by using lipase and a metal palladium catalyst, solves the problem of poor compatibility between the catalyst metal palladium and the lipase, spatially separates the lipase and the metal palladium, improves the cascade catalytic efficiency of the metal enzyme, and finally the yield of the product 4-biphenylcarboxylic acid ethyl ester can reach 55.85%; and the metal enzyme cascade reaction is completed in one pot in the emulsion microreactor, avoids separation of an intermediate product, expands the range of catalytic reactions, and provides a reaction platform for other high-value-added pharmaceutical intermediate products.

The invention discloses a method for catalytically hydrogenating and dehalogenating haloacetic acid or halomethane in a water body, which comprises the following steps of: catalytically hydrogenating and dehalogenating haloacetic acid or halomethane in the water body into acetic acid or methane by taking a ruthenium or platinum-containing material as a catalyst and hydrogen as a reducing agent; the noble metal in the catalyst is cheaper, and the unit price of ruthenium is far lower than that of palladium and rhodium; according to the method, the dehalogenation selectivity is higher, and compared with a palladium catalyst, the selectivity of hydrodechlorinating trichloroacetic acid in a water body into acetic acid is improved by 10.3%-15.5%; and the selectivity of trichloromethane hydrodechlorination into methane is improved by 8.6%-10.0%.

Improved processes are provided for efficient production of elacestrant and intermediates thereof, enabling higher atom economy, improved safety, reduced consumption of palladium catalysts, and easier purification.

The invention belongs to the field of fine chemical engineering, and discloses a preparation method of halauxifen-methyl, which comprises the following steps: by taking a compound I and a compound II as raw materials and acetonitrile or an acetonitrile-water mixed solution as a reaction solvent, under the protection of nitrogen, taking a palladium catalyst as a catalyst and under the condition that a cocatalyst exists or does not exist, carrying out a reaction on the compound I and the compound II to obtain the halauxifen-methyl. And carrying out Suzuki coupling reaction on the compound I and the compound II to obtain the halauxifen-methyl. The method for preparing the halauxifen-methyl is high in novelty, the product selectivity can be improved by adding the cocatalyst, the product yield is high and at least reaches 80%, and the product purity is high. # imgabs0 #

The invention belongs to the technical field of chemical synthesis, and provides a method for preparing 3-methyl-4-aminobenzoic acid through catalytic hydrogenation, which comprises the following steps: mixing 3-methyl-4-nitrobenzoic acid and a solvent, and adjusting the pH value to be alkaline while stirring to obtain a 3-methyl-4-nitrobenzoic acid solution; the method comprises the following steps: pouring a 3-methyl-4-nitrobenzoic acid solution into a reaction kettle, adding a modified palladium catalyst and an auxiliary agent, sequentially replacing with nitrogen and hydrogen for 2-3 times, introducing hydrogen, controlling pressure and temperature, and carrying out hydrogenation reaction to obtain a reactant; and after the reaction kettle is cooled, filtering reactants, adjusting the pH value of filtrate to be weakly acidic, crystallizing and drying to obtain the 3-methyl-4-aminobenzoic acid. The preparation method disclosed by the invention is simple in steps, a required product can be generated by a one-step method, meanwhile, the used modified palladium catalyst can be recycled, the generation amount of three wastes is small, coordinated development of economic benefits and environmental benefits is realized, and the 3-methyl-4-aminobenzoic acid is high in yield and purity and has a relatively good application value.

The invention relates to the technical field of organic synthesis, and discloses a method for synthesizing a 3-fluoropyrrole compound through palladium-catalyzed defluorination cyclization reaction. According to the method, high-efficiency preparation of the 3-fluoropyrrole compound is realized through intramolecular defluorination cyclization reaction of a gamma, gamma-difluoroallyl imine substrate under the action of a palladium catalyst. Compared with the traditional method for synthesizing the 3-fluoropyrrole compound, the method disclosed by the invention has the advantages that the raw materials are cheap and easy to obtain; the experiment operation is simple; the reaction yield is high; the method is wide in application range; a series of 3-fluoropyrrole derivatives can be obtained.

The invention discloses a method for enriching palladium from palladium-containing waste liquid by using chelate resin and preparing a nitrogen-doped graphitized carbon-loaded nano-palladium catalyst and application. The problems of loss of metal palladium, environmental pollution and the like in a palladium catalyst recovery and reutilization process are solved. The method for preparing the nitrogen-doped graphitized carbon-loaded nano-palladium catalyst comprises the following steps: 1, adding chelating resin into an aqueous solution containing PdCl4 < 2->, stirring and adsorbing, centrifuging, and drying to obtain PdCl4 < 2->-loaded chelating resin; and 2, putting the chelate resin loaded with the PdCl4 < 2-> into a tubular furnace, and carrying out a carbon thermal reduction reaction at the temperature of 500-1000 DEG C in a nitrogen atmosphere. According to the preparation method of the nitrogen-doped graphitized carbon loaded nano-palladium catalyst, nitrogen-doped graphitized carbon is formed under the action of metal ions, so that the conductivity and the electron transmission capability of a carrier are enhanced, and the activity and the stability of a Pd / NGC catalyst in a 12H-NEC dehydrogenation reaction process are improved.

The invention provides a preparation method of a high-selectivity semi-hydrogenation MOF (Metal Organic Framework) supported palladium catalyst for catalyzing acetylene. According to the invention, 2-methylimidazole is used as a ligand, Zn < 2 + > is used as a metal node, water is used as a solvent, and a ZIF-8-dia carrier is synthesized at room temperature by controlling the molar ratio of Zn < 2 + > to 2-methylimidazole; and depositing Pd < 2 + > on the ZIF-8-dia carrier by using a reducing agent to synthesize the MOF supported palladium catalyst. Strong electron interaction is formed between Pd nano-particles and a carrier loaded in the MOF loaded palladium catalyst, a rich Pd-N structure is constructed on the interface of the Pd nano-particles and the carrier, formation of Pd0 species is inhibited, the hydrogen activation capacity of the Pd nano-particles is reduced, excessive hydrogenation of acetylene is inhibited, and therefore the selectivity of ethylene is improved; the catalyst shows excellent catalytic performance in acetylene hydrogenation reaction, at 160 DEG C, the acetylene conversion rate reaches 100%, the ethylene selectivity is 85%, and the catalyst has excellent durability and stability.