755 results about "Reactive site" patented technology

The invention relates to the technical field of high-entropy oxide and electrocatalyst synthesis, in particular to a double-phase hollow high-entropy oxide catalyst and a preparation method and application thereof, the double-phase hollow high-entropy oxide catalyst comprises metal elements and non-metal elements, the metal elements comprise ruthenium, nickel, cobalt, iron, manganese and chromium; the non-metallic element is oxygen; the chemical formula of the double-phase hollow high-entropy oxide catalyst is NiCoFeMnCrRuO. The invention further discloses a preparation method of the catalyst. The double-phase hollow high-entropy oxide catalyst has a multi-shell hollow structure, provides a larger specific surface area and exposes a large number of reaction active sites, so that the double-phase hollow high-entropy oxide catalyst has lower overpotential, higher reaction efficiency and good electrochemical stability; meanwhile, the preparation method of the double-phase hollow high-entropy oxide catalyst is simple in process, low in cost, high in repeatability and suitable for industrial mass production, and has a wide application prospect.

The invention provides a preparation method and application of a cobalt-based catalyst, and relates to the technical field of chemical production. The cobalt-based catalyst includes cobalt, a transition metal element, and a Group IIIA element other than aluminum. Transition metal elements and IIIA group elements except aluminum are introduced into the cobalt-based catalyst, and the electronic structure and active sites of the cobalt-based catalyst are changed. The method not only can cooperate with catalytic reaction and promote the formation and conversion of intermediates, but also can enhance the adsorption and activation capability on substrates, reduce the reaction activation energy and guide the reaction to be carried out along a specific path. Finally, the effect of efficiently harvesting the 2-methyl pentamethylene diamine and the 3-methylpiperidine at the same time is achieved.

The invention discloses a reaction site prediction method and device based on chemical and physical prior driving, and the method comprises the steps: extracting set features through the multi-modal input of a fusion molecular map, an SMILES sequence and a three-dimensional conformation; generating atomic embedding by using a message passing neural network, and calculating a mixed feature fusing a topological path and a three-dimensional distance; combining the key type weight to construct a graph position code of chemical environment correction; injecting the mixed distance and the charge difference into a Transform attention mechanism, and explicitly modeling an inter-atomic long-range electron effect; a model is jointly trained through double tasks of comparative learning and mask prediction, the comparative learning adopts a directional negative sample to enhance generalization, and mask prediction synchronously recovers an atom type and a charge transfer matrix; and finally, injecting quantum chemistry priori constraint attention weights such as a Fuzzy well function, outputting an atomic-scale reaction activity probability, generating a thermodynamic diagram, and realizing high-precision and interpretable active site labeling. According to the method, the drug design and reaction mechanism analysis efficiency can be remarkably improved.

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 preparation and application of an imido covalent organic framework material containing imidazolyl ionic liquid. The imido covalent organic framework material (ILs-TPN-COFs) containing the imidazolyl ionic liquid is obtained by connecting the imidazolyl ionic liquid [CnCmILs (at) Br] to an imido covalent organic framework TPN-COFs through a covalent bond. The material has an ionic liquid tertiary amine N active site and a halogen anion active site, and can promote CO2 activation and ring opening of epoxide. The ILs-TPN-COFs catalytic material has the advantages of uniform distribution of active sites, better stability, easiness in separation of the catalyst from a reaction system, better repeatability and the like. According to the invention, the prepared novel ILs-TPN-COFs material is applied to catalysis of synthesis of propylene carbonate from carbon dioxide and epoxypropane, and shows excellent catalytic performance under mild reaction conditions.

The invention provides a Pd-M1-M2-Sn entropy intermetallic compound catalyst as well as a preparation method and application thereof, active metal components M1 and M2 in the catalyst are respectively selected from one of Fe, Co and Cu, and M1 is different from M2; according to the catalyst, a Pd-M1-M2-Sn multi-tooth rhombic active site is jointly formed by four kinds of metal, and a Pd-M1-M2-Sn quadruple site structure formed by M1, M2 and Sn which are deficient in electrons and Pd which is isolated and rich in electrons is formed. When the catalyst is applied to preparation of methanol through catalytic hydrogenation of carbon dioxide, the CO2 conversion rate, the methanol selectivity and the methanol yield can be remarkably improved, and the catalyst keeps good stability in a long-time reaction and has a wide industrial application prospect.

The invention discloses an MWW molecular sieve and a preparation method thereof, and the preparation method comprises the following steps: (a) mixing an alkali source, water, an aluminum source, a template agent and a silicon source to form a mixture A; (b) adding nano cellulose into the mixture A to form a mixture B, and pretreating, crystallizing and drying the mixture B to obtain the MWW molecular sieve. The preparation method disclosed by the invention is simple and convenient, easy to industrialize and wide in application prospect, and the MWW molecular sieve with the single-layer structure is prepared. The MWW molecular sieve with a single-layer structure can expose more active sites, promotes diffusion and mass transfer, shows excellent performance in many reaction processes, and particularly shows high activity and stability in a reaction with macromolecules as a substrate.

The invention relates to the technical field of methane oxidative coupling, and discloses a methane oxidative coupling catalyst as well as a preparation method and application thereof. In the methane oxidative coupling catalyst provided by the invention, the active component forms a monatomic active site on the carrier, so that the dispersity and the atom utilization rate of the active component are greatly improved, and the selectivity and the yield of C2 hydrocarbon are promoted to be improved.

The invention relates to a compound and an organic light-emitting device, in particular to a novel organic light-emitting material, and synergistic improvement of various excellent properties is achieved through careful design of a molecular structure. Because deuteration is carried out on active sites of respective structures, the compounds have good thermal stability, chemical stability and photoelectric stability. Meanwhile, the compound has good carrier mobility, an exciton recombination region is further widened, the service life of a device is prolonged, and the efficiency of the device is improved. And # imgabs0 #.

The invention provides a ZIF-derived Co-P catalyst and a preparation method thereof. The catalyst can be used for synthesizing dimethyl carbonate through oxidative carbonylation of methanol. The ZIF-derived Co-P catalyst disclosed by the invention is prepared by roasting a precursor P-doped Zn / Co-ZIF intermediate. Compared with a traditional cobalt-based catalyst, the Co-P catalyst prepared through roasting treatment modification can regulate and control the variety and coordination number of heteroatoms, improve the interaction between metal and a carrier and effectively anchor metal atoms, and meanwhile P atoms can serve as second active sites to assist in improving the adsorption and activation capacity of reactants and intermediate species. In addition, the ZIF generates a hierarchical pore structure in the roasting treatment process, so that the mass transfer and diffusion processes of reactants and products are effectively promoted. According to the Co-P catalyst disclosed by the invention, the methanol oxidative carbonylation reaction activity is remarkably improved, and the catalyst has high stability.

The invention discloses a preparation method and application of a monatomic catalyst for catalytic degradation of ethanethiol, and belongs to the technical field of organic sulfur pollutant treatment.The atomic-scale dispersion of Ce species is achieved through HY molecular sieve FAU type topological structure constraint and cerium loading capacity limitation, the catalyst shows atomic-scale active sites, and the catalytic degradation of ethanethiol is achieved. The conversion path of ethanethiol can be accurately regulated and controlled, and efficient degradation of ethanethiol is realized; the topological confinement effect guarantees the stability of the monatomic catalyst, and the HY molecular sieve pore channel restrains migration of Ce atoms and inhibits agglomeration of Ce metal, so that the monatomic catalyst shows good anti-sintering ability, and at the same time, sulfur poisoning and carbon deposition rate are slowed down.

The invention belongs to the field of computational chemistry, and particularly relates to a multi-parameter collaborative dynamic screening method for adsorbed species on the surface of a catalyst. Comprising the following steps that an initial crystal structure is constructed and optimized through VESTA software, and a stable crystal structure model is obtained through density functional theory optimization; integrating working condition parameters such as a solvent, pH and potential, and drawing a Bayer diagram to label adsorption species and a mapping relation; and calculating a zero charge point and capacitance to obtain electrochemical parameters, and determining stable adsorption species under actual reaction through constant potential molecular dynamics simulation. According to the scheme, a deep structure-activity relationship between an active site structure and catalytic activity under a working condition is established through integration of all working condition parameters, labeling of adsorption species by a Boubye diagram, constant potential molecular dynamics simulation and the like; the problems that a systematic method combined with actual working condition parameters is lacked in prediction of the adsorbed substances on the surface of the catalyst, and real adsorbed species are difficult to accurately screen are solved, and accurate capture and efficient screening are achieved.

The invention relates to a preparation method of a Cu-Co bimetallic semi-crystalline material and application of the Cu-Co bimetallic semi-crystalline material to adsorption of dye, and belongs to the field of preparation of nano materials and environmental materials, the Cu salt and the Co salt of the same type are weighed, the mass ratio is 1: 3-3: 1, the Cu salt and the Co salt are mixed in an ethanol solution, and the Cu salt and the Co salt are promoted to be dissolved and fully mixed through ultrasonic waves to be named as a solution A; adding an organic ligand into deionized water, and enabling the concentration of the organic ligand to be 0.2 mol / L by utilizing an auxiliary reagent under an ultrasonic condition, so as to obtain a solution B; mixing the solution A and the solution B according to the volume ratio of 1: 2, and stirring to a flowable liquid state under the condition of constant-speed stirring, so as to obtain a substance C; centrifugally collecting and drying the C substance to obtain a dried Cu-Co bimetallic semi-crystalline material; the preparation method of the Cu-Co bimetallic semi-crystalline material is simple, convenient, rapid and low in energy consumption, and the synthesized Cu-Co bimetallic semi-crystalline material has a multi-element pore structure, a large specific surface area and multi-element active sites and is high in adsorption capacity.

The invention discloses preparation of a layered mesoporous Pd-Cu nano-catalyst and a method for preparing glycollic acid from PET hydrolysate through electro-oxidation under environmental conditions, and belongs to the technical field of catalysts. The preparation method comprises the following steps: dissolving CTAB (Cetyltrimethyl Ammonium Bromide) serving as a surfactant in a cosolvent of water and TMB (Tetramethylbenzidine), sequentially adding NH4PdCl4 and Cu (NO3) 2.3 H2O serving as metal precursors into a reaction solution, and finally synthesizing the layered mesoporous Pd-Cu by virtue of a reduction effect of sodium borohydride and an in-situ nucleation and adhesion method. Continuous electro-catalysis is carried out in a pulse mode, selective desorption of GA is dynamically accelerated, and new active sites of a metal catalyst are exposed. The electric pulse catalysis can promote the desorption of the product, prevent poisoning, and further improve the stability and selectivity of the catalyst. The method shows excellent glycollic acid Faraday efficiency, high generation rate and excellent cycle stability under a wide potential window, 20 times of electro-catalysis PET upgrading cycles are achieved, and upgrading utilization of PET waste and efficient generation of glycollic acid are achieved.

The invention discloses a zirconium-based MOF material and a preparation method and application thereof, in the zirconium-based MOF material, metal ions are Zr < 4 + >, an organic ligand is ellagic acid, a conditioning agent is gallic acid, and the material has an oxygen vacancy structure and a hierarchical pore structure; the preparation method comprises the following steps: (1) mixing ellagic acid, gallic acid, zirconium oxychloride octahydrate and a solvent, and carrying out solvothermal reaction; and (2) washing and drying the solid after the reaction in the step (1) to obtain the zirconium-based MOF material. According to the invention, renewable and low-cost ellagic acid and gallic acid are respectively used as an organic ligand and a conditioning agent, and an oxygen vacancy structure is constructed in a competitive coordination manner, so that more hydroxyl and unsaturated metal Zr active sites are exposed, the interaction with formaldehyde (HCHO) is enhanced, and meanwhile, the oxygen vacancy structure can be used as an oxygen vacancy catalyst. And the existence of the hierarchical pore structure can effectively promote mass transfer, so that the HCHO adsorption capacity is improved.

The present invention discloses a preparation method and application of a MOF-on-MOF heterojunction metal-organic framework material rich in oxygen defects, belonging to the technical field of electrocatalytic oxygen evolution reaction. The present invention first grows Ni NDC nanosheets in situ on a carrier by a solvothermal method, and then grows Fe BDC nanosheets on the surface of the Ni NDC nanosheets by a solvothermal method to form Ni NDC@Fe BDC ultra-thin nanosheets. This method can synthesize a MOF-on-MOF type metal-organic framework under the premise of lattice mismatch. The synthesized Ni NDC@Fe BDC combines the advantages of multi-component material hybridization, ultra-thin nanosheets and defect induction, which can increase the number of active sites and promote the rapid transfer / redistribution of electrons in the catalytic process. The MOF-on-MOF heterojunction metal-organic framework has good electrocatalytic performance and excellent total water decomposition performance in alkaline oxygen evolution reaction.

The invention discloses a preparation method and application of a CoNiNOC diatomic electrocatalyst for an electro-Fenton system. The preparation method of the catalyst comprises the following steps: firstly, preparing an oxygen-doped cobalt monatomic catalyst (CoNOC) through a temperature gradient pyrolysis and pickling process, and then preparing an oxygen-doped diatomic catalyst (CoNiNOC) by introducing a Ni site into a precursor and using a similar process. The loading capacity of metal active sites is improved by introducing Ni sites, and the electronic structure of an active center is further regulated and controlled, so that the 2e-ORR activity is improved by 15%, the H2O2 selectivity reaches 96% or above, and the stability is 100 h or above. The invention also discloses an application of the catalyst as a heterogeneous electro-Fenton catalyst in degradation of antibiotics, and a CoNiNOC cathode not only can efficiently degrade TC, but also has higher degradation efficiency, TOC degradation rate and kinetic rate constant for various organic antibiotics.

The invention discloses a preparation method of a phenolic chitosan quaternary ammonium salt antibacterial agent, which comprises the following steps: alkalizing chitosan at low temperature, then carrying out substitution reaction on the alkalized chitosan and a carboxylic acid derivative, and introducing a reactive carboxyl group on the hydroxyl of the chitosan to obtain O-carboxylated chitosan, so as to provide reactive sites for subsequent secondary modification; the preparation method comprises the following steps: preparing O-carboxylated chitosan, introducing a quaternary ammonium salt group on an amino group of the O-carboxylated chitosan through a ring-opening reaction so as to improve the antibacterial property and water solubility of the chitosan, and finally reacting with a phenolic derivative to obtain the phenolic chitosan quaternary ammonium salt antibacterial agent. According to the preparation method of the phenolic chitosan quaternary ammonium salt antibacterial agent, industrial production is easy, and the prepared phenolic chitosan quaternary ammonium salt antibacterial agent has good antibacterial performance and free radical scavenging capacity and also has good water solubility.

The invention relates to a CuKMoS2 / SiO2 catalyst for synergistically preparing methyl mercaptan from carbon dioxide and hydrogen sulfide. By introducing a small amount of copper (Cu) into a KMoS2 / SiO2 catalyst system, the selectivity of the catalyst to a reaction intermediate product methanol (CH3OH) is remarkably improved, so that the generation selectivity to a target product methyl mercaptan (CH3SH) is improved. The introduction of Cu promotes the electron transfer of active sites on the surface of the MoS2 catalyst, and optimizes the reaction path. The invention provides a preparation method of a catalyst with high efficiency, good selectivity and strong stability and a new process applied to methyl mercaptan production.

The invention discloses a method for preparing a g-C3N4 loaded Fe and Mn bimetallic catalyst with high efficiency and low cost, and belongs to the technical field of catalysts. Manganese ferrite is adopted as a bimetal source, a melamine one-step calcination method is combined, synthesis of g-C3N4 and loading of Fe and Mn are synchronously achieved, manganese ferrite is decomposed into FeOx and MnOx nanoparticles in the calcination process, the FeOx and MnOx nanoparticles and nitrogen sites of g-C3N4 form strong coordinate bonds, metal atomic-scale dispersion can be achieved, and metal ion migration is inhibited; through the bimetallic synergistic effect of Fe and Mn, the oxidation-reduction capacity of the catalyst can be remarkably improved; through the unique thermal decomposition characteristic, the bimetallic synergistic effect and the strong chemical bonding of the manganese ferrite and g-C3N4, the efficient exposure of active sites, the remarkable improvement of the oxidation reduction capacity and the effective inhibition of metal dissolution are realized, and the preparation method also has the advantages of high efficiency, low cost and small secondary pollution risk.

The invention discloses a highly reconstructed Ni-doped glassy MOFs electrocatalyst and a preparation method and application thereof.The preparation method comprises the steps that a solution containing cobalt salt and an organic ligand is subjected to a hydrothermal reaction, and ZIF-Co powder is obtained; taking a mixture of ZIF-Co powder and a nickel source as a powder precursor; loading the powder precursor on the electrode material to obtain a catalyst-loaded electrode material; the electrode material loaded with the catalyst is vitrified through a melting quenching technology and then reconstructed, and the highly reconstructed Ni-doped glassy MOFs electrocatalyst is obtained. According to the method, electrochemical surface reconstruction is promoted by vitrification, the glassy MOFs catalyst with rich active sites is obtained, the problem that the active sites of the MOFs material are not easy to expose is solved, in addition, the glassy MOFs can be directly fused and attached to an electrode material without a binder, the problem that a powder catalyst is difficult to process is solved, and the preparation process is simple. And device assembly and industrial large-scale production are facilitated.

The invention discloses a zinc-sulfur co-doped ZIF-67 derivative composite material as well as a preparation method and application thereof, and belongs to the technical field of advanced oxidation. The composite material is prepared through a coordination-substitution-calcination integrated process. The preparation method comprises the following steps: firstly, mixing a cobalt source and an organic ligand in methanol, and introducing a sulfur source to form a cobalt-based precursor; and drying, grinding with a zinc source, and calcining in an inert atmosphere. According to the method, stable cobalt active sites are replaced by isocrystals of zinc, sulfur doping promotes cobalt and peroxymonosulfate to form a weak oxidizing intermediate, and efficient and high-selectivity degradation of organic pollutants is achieved under the condition that a strong free radical path is not needed. The material is stable in structure and high in water quality interference resistance, is suitable for catalyzing peroxymonosulfate to degrade organic pollutants in a water body, and particularly has remarkable advantages in a complex water body.

The invention belongs to the technical field of preparation of novel electrocatalysts, and particularly relates to preparation and application of an angstrom confinement electrocatalyst for selectively activating molecular oxygen to produce hydroxyl radicals. The preparation method comprises the following steps: taking 2H-phase MoS2 as a precursor, loading metal single atoms on the surface of the precursor, and intercalating alkali metal cations; the angstrom confinement catalyst is 1T-phase MoS2 loaded with metal single atoms. The angstrom confinement catalyst provided by the invention is high in three-electron selectivity, can remarkably expose catalytic active sites, accelerates mass transfer of reactants, generates active oxygen species in a penetrating reactor, realizes high hydroxyl radical generation rate and utilization efficiency in an angstrom channel, is simple in preparation method, and has good electrochemical stability. The method lays a foundation for Angstrom confinement catalysis, and reflects the importance of the Angstrom confinement strategy in the design of a high-efficiency catalyst for water pollution control.

The invention relates to the technical field of catalysis, in particular to a green preparation process for synthesizing 4 '-chloro-2-aminobiphenyl through a membrane method.A palladium-based catalytic membrane is prepared through an impregnation method, by means of the multi-pore-channel advantage of a ceramic membrane, active components can be well distributed on the surface and in the membrane, contact of a reaction substrate and active sites is promoted, and the catalytic activity of 4'-chloro-2-aminobiphenyl is improved. The reaction effect is enhanced, the reaction efficiency is improved, the preparation process is simple, the preparation environment is mild, and large-scale production can be realized; meanwhile, the 4 '-chloro-2-aminobiphenyl is prepared by adopting a method for carrying out Suzuki-Miyaura coupling reaction by adopting the catalytic membrane, tedious steps in the traditional industry are omitted, compared with a traditional heterogeneous catalyst, the trouble of recovery is avoided, the cost is saved, the harm to the environment is greatly reduced, and compared with the prior art, the 4'-chloro-2-aminobiphenyl has a wide application prospect.

The invention provides a titanium-based catalyst, a preparation method of the titanium-based catalyst and a synthesis method of pyroxasulfone. The titanium-based catalyst comprises a main active component and an auxiliary metal component M doped in the main active component, wherein the main active component is a titanium dioxide nanobelt, the titanium dioxide nanobelt forms an oxygen vacancy defect, and the concentration of the oxygen vacancy defect is 5-20 [mu] mol / g; the auxiliary metal component M comprises at least one of Re, Ru, Mo, V, Ce, Zn and Cr. The titanium-based catalyst is filled in a fixed bed and is used in a reaction for synthesizing pyroxasulfone through thioether oxidation, and oxygen vacancy defect sites not only can enhance adsorption and activation of reactants so as to improve reaction kinetics in the oxidation process, but also can generate electron interaction with auxiliary metal ions so as to improve the catalytic activity of pyroxasulfone. The dispersity and the stability of the auxiliary agent metal component M on the titanium dioxide nanobelt are improved, so that more reaction active sites are provided, and continuous synthesis of pyroxasulfone is realized.

The invention discloses a Pt-Ni (OH) 2 composite hydrogen evolution catalyst and a preparation method and application thereof.The preparation method of the Pt-Ni (OH) 2 composite hydrogen evolution catalyst comprises the following steps that a platinum source, metal nickel salt and urea are dissolved in a solvent and dispersed, and a mixed solution is obtained; transferring the mixed solution into a reaction kettle, carrying out hydrothermal reaction, cooling, and carrying out solid-liquid separation on a reaction product to obtain a solid product; and finally, washing the solid product, and freeze-drying to obtain the product. According to the Pt-Ni (OH) 2 composite hydrogen evolution catalyst prepared by adopting a one-step solvothermal method, the alpha-Ni (OH) 2 component can obviously improve the hydrogen evolution catalytic activity in an alkaline electrolyte; and the interlayer spacing of alpha-Ni (OH) 2 is further expanded, so that more active sites can be exposed, the mass transfer process is accelerated, the electron transfer path is improved, the proton conductivity is improved, rapid transfer of reactants and products is promoted, and the catalytic activity is improved.

The invention provides a monatomic cobalt-based composite catalyst, a preparation method of the monatomic cobalt-based composite catalyst and application of the monatomic cobalt-based composite catalyst to degradation of antibiotics by activating peroxymonosulfate, and belongs to the technical field of advanced oxidation. The method comprises the following steps: mixing biomass powder and water to obtain a biochar suspension, adding cobalt nitrate hexahydrate into the biochar suspension, centrifuging the mixed solution, collecting residues, and drying to obtain a sample; and pyrolyzing the sample in a protective gas atmosphere, taking out, cooling, washing, and drying to obtain the monatomic cobalt-based composite catalyst. The cobalt-based catalyst prepared by the invention has high specific surface area, abundant pore structures and a large number of active sites, and is beneficial to activation of PMS and degradation of pollutants; the cobalt-based composite catalyst prepared by the method is used for activating peroxymonosulfate to degrade tetracycline, and the removal rate of tetracycline in a solution is greater than 99% after reaction is carried out for 20 minutes under a dark condition.

The invention discloses a sodium metavanadate-based catalyst activity gradient regulation and regeneration system and method, and relates to the technical field of industrial catalyst regeneration, the sodium metavanadate-based catalyst is of a unique layered structure, the sodium metavanadate-based catalyst comprises an outer layer, a middle layer and an inner layer from the surface to the interior in sequence, and active components and doping elements of all the layers are different; the outer layer is doped with high-content sodium metavanadate and manganese oxide, reactant molecules can be quickly adsorbed and activated in the initial stage of the reaction, the manganese oxide can provide additional active sites, reduce reaction activation energy and promote quick start of the reaction, and the middle layer is doped with a proper amount of sodium metavanadate and cerium oxide, so that the reaction is more stable in the process of the reaction. The cerium oxide can adjust migration and conversion of oxygen species on the surface of the catalyst, optimize the reaction path, improve the selectivity of a target product and reduce side reactions, the inner layer is doped with the low-content sodium metavanadate and tungsten oxide, and the structural stability of the catalyst under high-temperature and long-time reaction is maintained by means of the high stability of the tungsten oxide.

The invention discloses a preparation method and application of a catalyst based on pyridine ionic liquid, and belongs to the technical field of catalyst preparation. According to the invention, a hydrolysis reaction of a silane coupling agent is utilized to prepare a silicon oxide nanotube containing a pyridine unit, and then a quaternization reaction is carried out to obtain the catalyst based on the pyridine ionic liquid. The catalyst has a high specific surface area and a rich pore channel structure, exposure of active sites and contact of the active sites and reactants are facilitated, and the catalytic rate is increased. Meanwhile, the silicon oxide nanotube contains hydroxyl, and can cooperate with a pyridine ionic liquid site to catalyze a carbon dioxide cycloaddition reaction. The obtained catalyst can catalyze the reaction of carbon dioxide and an epoxy compound to prepare cyclic carbonate under solvent-free and metal-free conditions, and the catalyst is easy to recover and simple in product purification, and has a good application prospect.

The invention discloses a hydrophobic carbon-based monatomic catalyst and a preparation method thereof. The hydrophobic carbon-based monatomic catalyst comprises a carbon skeleton of a core-shell structure, a metal monatomic active site fixed on the carbon skeleton by forming a coordinate bond with N on the carbon skeleton, and an alkyl chain grafted on the carbon skeleton through a covalent bond. The alkyl chain is grafted through the covalent bond, chemical stable regulation and control of the hydrophobicity of the carbon-based nickel monatomic catalyst are achieved, covalent bond modification avoids the defects of a physical method, long-term stability of hydrophobicity is ensured, and efficient hydrophobic modification is achieved on the premise that monatomic sites are not damaged; a stable three-phase interface is formed on the hydrophobic surface, physical enrichment of CO2 near the catalyst is promoted, mass transfer resistance is reduced, CO2 diffusion is further accelerated through the hollow structure of the carbon skeleton, and the mass transfer capacity is improved.