538 results about "Nickel catalyst" patented technology

The invention discloses a supported nickel catalyst for preparing 1, 3-propylene glycol through hydrogenation of 3-hydroxypropionaldehyde as well as a preparation method and application of the supported nickel catalyst, and relates to the technical field of catalysts. The modified long-chain multi-carbon inducer is used, and a special long-chain molecular structure and a branched chain group of the inducer can effectively and selectively adsorb and occupy a micropore impregnation site; the preparation method has the beneficial effects that more active component nickel species are obviously promoted to be dispersed in main reaction confinement spaces such as mesopores and macropores and interact with the carrier to form effective active sites, and active component steeping liquor is inhibited from entering micropore channels due to capillary action; the active site failure caused by agglomeration of nickel species in micropores in the subsequent drying and roasting process of the catalyst precursor is avoided, the efficient and directional reaction is ensured, the generation of by-products is greatly reduced, the pressure is relieved for the subsequent product rectification separation, and the final product purity is improved. The catalyst provided by the invention can still keep an excellent catalytic effect when the air speed of a 3-hydroxypropionaldehyde solution is increased to 6.5 h <-1 >.

The invention discloses branched polyethylene and a preparation method thereof. The preparation method of the branched polyethylene comprises the following steps: taking an alpha-diimine nickel catalyst as a main catalyst, wherein the alpha-diimine nickel catalyst is shown in a formula (1); the method comprises the following steps of: polymerizing ethylene by using at least one selected from aluminoxane, modified aluminoxane, alkyl aluminum, alkyl aluminum hydrolysate, halogenated alkyl aluminum, aryl boron, alkyl boron and borate as a cocatalyst and using a polymerization solvent containing a halogenated organic solvent under the conditions that the polymerization reaction temperature is 60-85 DEG C and the polymerization pressure is 1.2-3.0 MPa to obtain the branched polyethylene. Compared with the traditional EPDM, the branched polyethylene prepared by the method provided by the invention has the advantage that the low-temperature impact performance of a polypropylene base material is improved very well.

The invention relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

The invention discloses an electrocatalytic oxidation method for highly selectively converting 5-hydroxymethylfurfural into 2, 5-furandicarboxylic acid by using a cobalt-nickel bimetallic catalyst, and belongs to the technical field of electrochemistry. Firstly, foamed nickel is pretreated; secondly, preparing a cobalt-nickel mixed solution, synthesizing the catalyst by adopting a solvothermal method, and characterizing the catalyst; and thirdly, preparing a three-electrode system by taking the cobalt-nickel catalyst as a working electrode, a spiral platinum wire electrode as a counter electrode, a Hg / HgO electrode as a reference electrode, an alkaline solution as an electrolyte and a Nafion 117 proton membrane as a diaphragm to realize conversion. And finally, testing the stability and cyclicity of the cobalt-nickel catalyst. Under the same potential, the material has the highest current density, the maximum electrochemical active area and the optimal charge transfer rate; the self-degradation of HMF can be effectively inhibited, the electrocatalytic oxidation has lower initial potential than the oxygen evolution reaction, and the electrode cycle stability is good; the method is simple in process, mild in condition and beneficial to industrial production.

The invention belongs to the field of polymer synthesis, and discloses a polymerization method for regulating the molecular weight of polyketone. A nickel catalyst is adopted to catalyze ethylene, CO and propylene ternary polymerization under the action of adding a chain transfer agent and a stabilizer to directly prepare a series of ternary polyketone macromolecules with different molecular weights and adjustable melting points, the synthesis route is simple and convenient to operate, the reaction conditions are relatively mild, the molecular weight range of the obtained polyketone is relatively wide, and the production cost is low. The method is suitable for preparing multi-purpose and multifunctional polyketone high polymer materials through multiple processing ways. The molecular weight of the obtained polyketone is more than 80,000 and less than 200,000, and the polyketone can be processed into engineering plastics in injection molding, extrusion molding and other modes; the molecular weight of the obtained polyketone is as high as more than 9 million, and the application prospect of the polyketone for solution spinning into a polyketone super-strong fiber product can be met.

The present invention provides a continuous solution preparation method for vinyl polyolefin elastomer, belonging to the technical field of polyolefins. The continuous solution preparation method comprises: using ethylene as a single olefin raw material, under the action of a nickel diimide catalyst and a co-catalyst, performing a polymerization reaction in a solvent of at least one reactor to obtain a vinyl polyolefin elastomer glue solution; directly passing the vinyl polyolefin elastomer glue solution into a deashing unit for at least one of washing deashing and adsorption deashing to remove the nickel diimide catalyst and the co-catalyst to obtain a deashed vinyl polyolefin elastomer glue solution; continuously passing the deashed vinyl polyolefin elastomer glue solution into a devolatilization unit for static devolatilization to remove volatiles to obtain a devolatilized vinyl polyolefin elastomer glue solution; extruding and granulating the devolatilized vinyl polyolefin elastomer glue solution to obtain vinyl polyolefin elastomer particles.

The invention relates to the technical field of catalysts, and particularly discloses a phosphorus-containing porous organic polymer supported nickel catalyst which is prepared from a Ni precursor and a phosphorus-containing porous organic polymer, the loading amount mass fraction of Ni in the catalyst is 0.1-10%, and the phosphorus-containing porous organic polymer is a random copolymer and has a structural general formula I; the invention also provides a preparation method and application thereof. After the porous organic polymer containing the phosphorus ligand provided by the invention and transition metal salt form a catalyst, the phosphorous acid diester compound can be efficiently catalyzed and synthesized, the phosphorous acid diester compound can be recycled after the reaction, and the performance cannot be obviously reduced in the cyclic catalysis process.

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 present application relates to a kind of green olefin removal method completely replacing clay, which comprises under liquid phase continuous hydrotreating conditions, first, reforming generated oil is mixed with hydrogen through high-efficiency mixer, hydrogen is mixed with reforming generated oil intensively and quickly, and saturated hydrogen-dissolved reforming generated oil is obtained, the saturated hydrogen-dissolved reforming generated oil is sent into first hydrogenation reactor, first contact with nickel-containing catalyst, and the reaction product is then introduced into second hydrogenation reactor, and contact with noble metal-containing catalyst.Reformate is treated by olefin removal, and the product obtained mainly contains benzene, toluene, xylene and other aromatic hydrocarbons, the bromine index of which is less than 20 mgBr / 100g oil, and the loss of aromatic hydrocarbons is less than 0.1wt%.

The invention relates to the technical field of preparation of catalysts, in particular to a titanium dioxide modified mesoporous nickel catalyst, a preparation process and application thereof, and the preparation method comprises the following steps: S1, preparing a titanium dioxide modified mesoporous silicon dioxide material; s2, nickel-based acid liquid is added into the titanium dioxide modified mesoporous silicon dioxide material, ultrasonic treatment is performed for 1 h after sufficient mixing, standing is performed for 24 h at the room temperature so as to perform the dipping process, and then the mixture is transferred into a drying oven and dried at the temperature of 110 DEG C; and S3, uniformly grinding the dried solid, putting a sample into a crucible, transferring the sample into a tubular furnace, introducing argon as a protective atmosphere, heating to 550 DEG C at a heating rate of 1 DEG C / min, and roasting for 6 hours to obtain the titanium dioxide modified mesoporous nickel catalyst. The method has relatively high industrial potential, can replace an expensive noble metal catalyst to be used for industrial production, and lays a certain technical foundation for realizing final industrial production of a carbon dioxide methane reforming reaction and integrating the reaction into a green energy storage system.

The invention discloses a copper-zinc-nickel catalyst as well as a preparation method and application thereof. A carrier of the copper-zinc-nickel catalyst is a ZnO carrier and is loaded with an active component copper-nickel alloy; the loading capacity of the active component copper and nickel is 35-65% of the total mass of the catalyst; the molar ratio of copper to nickel is (8-16): 1; according to the catalyst, high loading and high dispersion of Cu-Ni effective substances are effectively realized, so that the activity of the catalyst is improved by improving active sites, and the particle size of metal is effectively reduced. The copper-zinc-nickel catalyst provided by the invention is especially suitable for hydrogen production by methanol liquid phase reforming, the hydrogen production rate can reach 30.64 [mu] mol.gcat <-1 >. S <-1 > under the condition of 180 DEG C, the hydrogen selectivity reaches 91.82%, and the CO selectivity is less than 9.12%; relates to the technical field of catalysts.

The invention provides a preparation method of bicyclobutane, and belongs to the technical field of aerospace fuels. According to the method, the bicyclobutane fuel is efficiently synthesized through nickel-catalyzed bromocyclobutane coupling reaction, and according to the method, nickel chloride serves as a catalyst, a reducing agent manganese powder is added, and the debromination self-coupling reaction of halogenated cyclobutane is promoted. The reduction coupling fuel synthesis strategy shows high efficiency, and the conversion number (TON) of the nickel catalyst can reach 44. The reaction can be carried out in an open system at the temperature of 40 DEG C, a water-free and oxygen-free environment is not needed, the yield of the bicyclobutane fuel is 88%, and the purity of the bicyclobutane fuel is 99% or above. Fuel performance tests show that bicyclobutane has excellent physical and chemical properties, the density is 0.82 g.mL <-1 >, the combustion net heat value is 44.39 MJ.kg <-1 >, and bicyclobutane is a high-energy aerospace fuel with great potential.

The invention discloses a visible-light-induced method for synthesizing DCPTA, which belongs to the technical field of organic synthesis, and comprises the following reaction steps: under a nitrogen atmosphere, sequentially adding o-dichlorobenzene, N, N-diethylaminoethanol, a novel metal iridium complex, a nickel catalyst and a solvent into a Schlenk tube, and reacting under the irradiation of a blue LED lamp at room temperature; determining whether the reaction system is terminated or not through a silica gel plate point plate; and after the reaction is ended, carrying out reduced pressure rotary evaporation, and carrying out silica gel column chromatography separation and purification to obtain the product DCPTA. The method for synthesizing the DCPTA through visible light induction has the advantages of cleanness, high efficiency, few side reactions and high reaction yield.

The invention belongs to the technical field of preparation of transition metal organic photocatalysts, and particularly relates to design and a preparation method of a carbazole terpyridyl nickel catalyst. The invention aims to design and synthesize a carbazole terpyridyl nickel catalyst with light / nickel synergistic catalytic activity. The preparation method comprises the following specific synthesis steps: reacting different types of alpha-pyridone pyridinium and alpha, beta-unsaturated ketone in methanol, and carrying out suction filtration, washing, drying and other operations to obtain the corresponding carbazole terpyridyl ligand. The carbazole terpyridyl ligand and anhydrous nickel bromide are subjected to a heating reflux reaction in a tetrahydrofuran solution, and the corresponding carbazole terpyridyl nickel catalyst is obtained through methanol washing, suction filtration, drying and other operations. The terpyridyl nickel catalyst has high catalytic activity in a C-N, C-O and C-S coupling reaction promoted by visible light.

The invention discloses a monolithic foamed nickel catalyst, a preparation method of the monolithic foamed nickel catalyst and efficient application of the monolithic foamed nickel catalyst in methane dry reforming, and relates to a strategy of in-situ construction of a Ni interface active site monolithic catalyst by taking porous foamed metal as a substrate. The reaction rate of methane dry reforming is improved by utilizing excellent thermal conductivity and abundant three-dimensional channels of a foamed nickel structured metal material, and adverse effects of sintering, carbon deposition and the like on active sites caused by methane cracking and carbon monoxide cracking are balanced; the monolithic catalyst prepared by the invention is applied to a methane dry reforming reaction with a certain concentration, under the conditions that the pressure is 0.1-1 MPa, the mass space velocity is 10000-50000 mL.gcat <-1 >. H <-1 >, CH4: CO2: N2 is 1: 1: 3 and the temperature is 650-700 DEG C, the CO2 conversion rate exceeds 85%, the CH4 conversion rate exceeds 75%, and the monolithic catalyst is expected to be applied to an industrial methane dry reforming process.

This invention relates to nickel catalysts with alkali ions for homopolymerization and copolymerization. This invention also relates to methods of preparing copolymers and to methods of degrading copolymers.

The invention relates to the field of advanced ceramic materials, in particular to a ceramic matrix composite (CMC) and a preparation method thereof. The technical problems that a traditional CMC preparation technology is long in period, poor in structural uniformity and insufficient in toughness are solved. According to the method, surface-modified aluminum oxide ceramic microspheres are used as reinforcements, the surfaces of the microspheres are sequentially modified with hexagonal boron nitride nanosheets and a metal nickel catalyst, the microspheres, silicon carbide nanoparticles and a polycarbosilane precursor are mixed to form slurry, and a complex component is formed through multi-material additive manufacturing. A green body is prepared by using a 3D printing technology combining photocuring and material extrusion; carrying out ultraviolet curing on the green body, and carrying out staged heat treatment in an inert atmosphere, so that the precursor polymer is subjected to cross-linking curing, and meanwhile, carbon nanowires grow through in-situ catalysis; and finally, sintering under a pressurizing condition to realize matrix densification. The preparation period is greatly shortened, and the obtained composite material is uniform in structure, compact in matrix and excellent in mechanical property.

The invention relates to a carbon nano reinforced thermoplastic polyurethane composite material as well as a preparation method and application thereof. The composite material is prepared from the following components in parts by mass: 5 to 20 parts of diisocyanate, 10 to 30 parts of oligomer dihydric alcohol, 1 to 10 parts of bifunctional chain extender and 1 to 20 parts of filler, the filler is prepared from the following components in parts by mass: 0.95 to 18 parts of inorganic filler and 0.05 to 2 parts of carbon-based nano filler; preparing a carbon-based nanofiller of flaky carbon nanofibers, tubular carbon nanofibers or fishbone-shaped carbon nanofibers from reaction gas by using a metal catalyst through a chemical vapor deposition method; the metal catalyst is selected from an iron-nickel catalyst or a nickel-copper catalyst, the reaction gas comprises a carbon source gas and a reducing gas, the carbon source gas is selected from carbon monoxide or ethylene, and the reducing gas adopts hydrogen. Compared with the prior art, the material has good mechanical properties and damping performance, especially has excellent normal-temperature damping performance and damping temperature range, and is suitable for 3D printing.

The invention belongs to the technical field of catalysts, and relates to a cerium oxide supported nickel catalyst and a preparation method and application thereof, and the catalyst is composed of a metal nickel active component and a cerium oxide carrier. The cerium oxide prepared by adopting a reversed-phase microemulsion method is dispersed in a nano-scale manner, has a large specific surface area and abundant oxygen vacancies on the surface, can realize high dispersion of metal nickel after loading nickel on the cerium oxide, has relatively high stability, and is beneficial to realizing efficient methanation of carbon dioxide hydrogenation. By changing the preparation conditions of the reversed-phase microemulsion, the number of oxygen vacancies on the surface of the catalyst can be effectively adjusted, and the CO2 hydrogenation reaction performance of the catalyst is regulated and controlled. The cerium oxide supported nickel catalyst prepared by the invention has the CO2 conversion rate of 83% and the CH4 selectivity of 97%, and shows excellent CO2 conversion rate and methane selectivity, which indicates that the cerium oxide-containing catalyst provided by the invention has excellent CO2 hydrogenation performance, shows excellent catalytic activity, product selectivity and stability, and can be used for preparing a catalyst for hydrogenation of CO2. And large-scale industrial application can be realized.

A method for dry reforming of methane (DRM) includes introducing and passing a hydrogen (H2)-containing feed gas stream through a reactor to contact the H2-containing feed gas stream with particles of a catalyst at a temperature of from 500° C. to 900° C. to form a reduced catalyst; introducing and passing a mixed feed gas stream comprising methane (CH4) and carbon dioxide (CO2) through the reactor to contact the mixed feed gas stream with the reduced catalyst at a temperature of from 500° C. to 1000° C. thereby converting at least a portion of the CH4 and CO2 to H2 / CO and regenerating the catalyst particles to form a regenerated catalyst and producing a residue gas stream leaving the reactor. The catalyst may be a fibrous silica lanthanum oxide (FSL) catalyst, and / or a nickel-containing FSL (Ni / FSL) catalyst.

The invention relates to the technical field of nano material preparation and application, in particular to a transition metal selenide catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, metal nickel salt, ferric salt, urea and ammonium fluoride are dissolved in deionized water, and a nickel-iron layered hydroxide nanosheet precursor is synthesized through a hydrothermal method; secondly, preparing an iron-doped nickel selenide catalyst by adopting a selenylation reaction; the electronic structure of nickel selenide is regulated and controlled by utilizing an iron doping strategy, and the catalytic performance is improved. The prepared iron-doped nickel selenide catalyst has good catalytic activity when being used for hydrogen evolution reaction and sulfur ion oxidation reaction. In a two-electrode sulfur ion oxidation coupling hydrogen production electrolytic tank, the current density of 10mAcm <-2 > can be output only by the voltage of 0.439 V, and the targets of efficient and energy-saving hydrogen production and sulfur ion oxidation upgrading into a high-added-value elemental sulfur product are achieved. The method has the advantages of simple and controllable preparation process, low raw material price, easiness in batch production and the like, and can be used as a catalyst for efficient water electrolysis hydrogen production and sulfur ion oxidation reaction.

The invention provides an oxyfluoride loaded nickel phosphide catalyst and application thereof. The carrier and the active phase of the oxyfluoride-loaded nickel phosphide catalyst are simultaneously prepared by adopting a'one-pot method '. The oxyfluoride-loaded nickel phosphide catalyst disclosed by the invention shows excellent reaction activity in hydrodechlorination reaction of fluorine-containing chlorohydrocarbon, and compared with a magnesium fluoride-loaded nickel phosphide catalyst obtained by a conventional impregnation method, the activity is obviously improved.

This invention relates to nickel catalysts with alkali ions for homopolymerization and copolymerization.

The invention provides a method for constructing an aryl C-P bond through a reaction of an Ar-F compound of a nickel catalysis electron donating group, which comprises the following steps: in the presence of a nickel catalyst, an additive and alkali, carrying out a coupling reaction on a substituted aryl compound in a formula B and a compound in a formula C diphenylphosphine oxide in an organic solvent to generate an aryl phosphine oxide compound in a formula A, the reaction formula is shown in the specification, Ar is or, and R is an electron-donating group. The method disclosed by the invention has the effects that the substrate has universality, the operation is simple, the condition is mild, a noble metal catalyst and a phosphine ligand are not needed, the cost is low, and the yield is high.

An oxidant for humic acid modification and a method for preparing humic acid rich in carboxyl groups are provided. The oxidant used for humic acid modification includes cobalt-nickel catalyst loaded on biochars and hydrogen peroxide solutions. When preparing humic acid rich in carboxyl groups, first dissolving the humic acid in a 2 wt % sodium hydroxide solution to prepare a sodium humate solution; then, under stirring conditions, adding the oxidant used for humic acid modification to the sodium humate solution and react at 45-55° C. for 90-150 minutes; then freeze-drying to obtain the final product. The present disclosure selectively breaks and destroys the aromatic carbon structure of humic acid by using cobalt-nickel catalyst loaded on biochar in combination with hydrogen peroxide solution, and avoids the release of carbon dioxide generated by excessive oxidation of humic acid carbon structure, thereby directionally increasing the carboxyl content of humic acid.

This invention provides a coal tar pitch-based nickel catalyst, its preparation method, and its application, belonging to the field of solid waste resource recycling and synthetic carbon materials technology. This invention uses a mixed roasting method to prepare a coal tar pitch-based nickel catalyst with micropores and mesopores from the residual coal tar pitch after coal tar extraction. The synergistic effect of active nickel as an active site and the functional groups on the support surface significantly improves its catalytic liquefaction performance, exhibiting the advantages of "low cost, high temperature resistance, and strong adaptability." The preparation method provided by this invention not only offers an effective way for the high-value recycling of coal tar pitch but also provides a low-cost material for green conversion, environmental governance, catalysis, and other fields. It represents a green resource utilization strategy with significant economic and environmental benefits and broad commercial prospects.

The invention relates to the field of catalyst preparation methods, in particular to a preparation method of a carbon nanotube catalyst for hydrogen production through methane cracking. The method comprises the following steps: S1, synthesizing hydrated alumina precursor loaded iron-nickel alloy nanoparticles by adopting a one-step method; and S2, in an inert gas atmosphere, roasting the iron-nickel alloy nanoparticles to prepare the aluminum oxide loaded iron-nickel alloy nanoparticle catalyst. According to the invention, hydrated alumina precursor-loaded iron-nickel alloy nanoparticles are synthesized by a one-step method, and then are roasted in an inert gas atmosphere to prepare the alumina-loaded iron-nickel catalyst. The catalyst prepared by the method can reach a nanometer level, is controllable in particle size, high in dispersity and uniform and adjustable in composition, and shows good catalytic performance on high-temperature methane cracking reaction. Compared with the prior art, the method is simple in process and can be used for large-scale synthesis.

The invention provides a preparation method of a substituted benzoate derivative, which comprises the following steps: reacting zinc powder with a compound A in an organic solvent under the protection of inert gas to obtain a compound B containing a zinc reagent, coupling the compound B with a compound C under the action of a nickel catalyst and a metal Grignard reagent to generate a compound D, and separating the compound D from the compound C to obtain the substituted benzoate derivative. The method for preparing the final product is simple and efficient, the cost is reduced, and production is facilitated.

The invention belongs to the field of catalysts, and particularly relates to a supported foam nickel catalyst for catalytic combustion of low-carbon alkane and aromatic hydrocarbon and a preparation method of the supported foam nickel catalyst. According to the invention, the strong oxidizing property of the acidic potassium permanganate is utilized to etch the foamed nickel, the capacity of the carrier for supporting the active component is improved, the non-noble metal active component is introduced through a simple impregnation method, the method has the advantages of simple operation, low preparation cost, high universality and the like, and the problems of low introduction amount of the active component, poor catalytic activity and the like of the foamed nickel catalyst are solved. The catalyst disclosed by the invention not only can be used for catalytic combustion of low-carbon alkane such as ethane and propane, but also can be used for catalytic combustion of other non-low-carbon alkane VOCs (Volatile Organic Compounds), and has a good application prospect.

The invention discloses a neutral phosphine phenol nickel catalyst based on a tert-butyl structure. The catalyst has a structure shown as a formula (I), wherein R1 and R2 are respectively and independently selected from hydrogen, C1-C20 alkyl, fluorine, chlorine, bromine, iodine, nitryl, hydroxyl, substituted silicon group and C1-C20 substituted alkyl; r3 is independently selected from C1-C20 alkyl, C1-C20 substituted alkyl, phenyl or substituted phenyl, R4 and R5 are independently selected from hydrogen, fluorine, chlorine, bromine, iodine, C1-C20 alkyl, aryl, an oxygen-containing group, a nitrogen-containing group, a sulfur-containing group, a boron-containing group, an aluminum-containing group, a phosphorus-containing group, a silicon-containing group or a tin-containing group; tert-butyl is introduced into para-position and meta-position of a ligand phenol oxygen ring, and a protection barrier is formed by utilizing the steric hindrance effect of the t-butyl, so that decomposition and deactivation of the catalyst under a high-temperature condition are inhibited, the catalyst can stably play a catalytic role in an industrial common medium-high-temperature polymerization environment, and the process adaptation range of the catalyst is widened.