13results about How to "Many catalytically active sites" patented technology

The application discloses an MOF-derived nitrogen cobalt hetero-nano box electrocatalyst, a preparation method and application, and the method steps for preparing the catalyst are as follows: S1: preparation of a ZIF-67 template; S2: dissolving the ZIF-67 template in S1 in anhydrous methanol, ultrasonic stirring and dissolving, and recording as solution A; S3: dissolving 1H-1,2,3-triazole in an anhydrous methanol solution and recording as solution B; S4: adding the solution B in S3 into the solution A in S2, stirring, and then standing to perform a substitution reaction; and S5: centrifuging, drying and carbonizing the product after the reaction in S4 under nitrogen protection to obtain the MOF-derived nitrogen cobalt hetero-nano box electrocatalyst. The 2-methyl imidazole in the imidazole zeolite framework ZIF-67 is partially substituted by a high-energy nitrogen-containing ligand 1H-1,2,3-triazole ligand, a rich nitrogen source is provided, and the coordination environment of cobalt atoms is locally constrained, so that the prepared electrocatalyst has a lower hydrogen evolution overpotential under the alkaline condition of 1 mol / L KOH aqueous solution.

This invention belongs to the field of hollow multi-component nanomaterial preparation technology, specifically disclosing a hollow Cu3NbSe4 nanomaterial, its preparation method, and its application. The microstructure of the nanomaterial is a nanoscale hollow cubic structure. The preparation method includes: (1) dissolving niobium source and selenium source separately in oleylamine solvent by heating for later use; (2) treating the soluble copper source and the niobium source dissolved in (1) in a high-boiling-point organic solvent for deoxygenation and dehydration, and then carrying out a solvothermal reaction; (3) when (2) is heated to a certain temperature, injecting the selenium source dissolved in (1) to carry out a solvothermal reaction, and separating the obtained solid product after the reaction is completed. The synthesis process of this invention is simple, the reaction conditions are mild, and the energy consumption and cost are low; more importantly, it realizes the preparation of hollow Cu3NbSe4 nanomaterial with uniform morphology and size, high crystallinity, and stronger light absorption capacity, and the prepared hollow Cu3NbSe4 shows excellent performance in photocatalytic hydrogen production.

The invention relates to the technical field of electrocatalysts, in particular to an electrocatalyst based on a Cu-Zn metal organic framework material and a preparation method and application of the electrocatalyst. According to the preparation method, firstly, a precursor HKUST-1-Cux-Zny MOFs is synthesized, and the precursor HKUST-1-Cux-Zny MOFs is converted into a hollow Cu-Zn metal organic framework material in situ through ligand exchange; compared with a traditional synthetic method of an organic metal framework material, the metal organic framework material obtained through a ligand exchange in-situ conversion method has a hollow structure, so that the metal organic framework material has a larger specific surface area, and more catalytic active sites can be exposed. Meanwhile, due to the unique structure and electronic characteristics of the Cu-Zn metal organic framework material, the problems of low selectivity, low Faraday efficiency (FE) and low yield during existing electrocatalytic synthesis of amino acid are solved.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a preparation method and application of a double-alkali metal magnesium aluminate spinel catalyst. The preparation method comprises the following steps: mixing pseudo-boehmite and magnesium nitrate, adding the mixture into water, uniformly mixing, adding a dispersing agent and a precipitating agent, stirring, standing, aging, crystallizing, centrifuging, washing, drying and roasting to obtain a spinel carrier MgAl2O4; the spinel carrier MgAl2O4, a modifier and water are subjected to a reaction, hydrothermal crystallization, centrifugation, washing, drying and roasting are performed, and the treated spinel carrier MgAl2O4 is obtained; and mixing lithium nitrate, calcium nitrate, a pre-precipitating agent and water, performing ultrasonic treatment, heating, concentrating and evaporating, performing equivalent-volume impregnation on the treated spinel carrier MgAl2O4, and performing hydrothermal reaction, centrifugation, washing, drying and roasting to obtain the Li2O-CaO / MgAl2O4 double-alkali metal magnesium aluminate spinel catalyst. The preparation method is simple, and the prepared catalyst is low in cost and high in catalytic activity.

The application relates to the technical field of semiconductor catalysts, in particular to a high-entropy semiconductor catalyst as well as a preparation method and application thereof, and the preparation method of the high-entropy semiconductor catalyst comprises the following steps: at least one metal salt is mixed with water to obtain a metal salt solution; the metal salt solution is mixed with an amine organic ligand, centrifugal washing and freeze-drying treatment are carried out, and a multi-metal complex is obtained; the multi-metal complex is calcined under an inert atmosphere, and a high-entropy semiconductor catalyst is obtained. In the case of coordination atom anchoring, the movement of metal atoms is limited, so that a carbon-nitrogen-doped high-entropy semiconductor catalyst is obtained. The high-entropy semiconductor catalyst prepared by the preparation method has the characteristics of rich catalytic active sites, good chemical stability and uniform distribution of elements, the preparation method is simple and easy to realize, the production process is green and environment-friendly, and the high-entropy semiconductor catalyst is easy to realize large-scale production and is conducive to large-scale popularization and use.

The application discloses a kind of metal modified covalent organic framework composite catalytic materials and preparation method thereof, the method is first prepared by solvent thermal method through Schiff base condensation reaction and enol-keto tautomerism β-ketoenamine type DAAQ-TP-COF;With β-ketoenamine type DAAQ-TP-COF and soluble copper salt as raw material, with aliphatic alcohol as solvent, copper ion functionalization Cu-DAAQ-TP-COF catalytic material is prepared by post-modification method.The preparation process of the application is simple, the production cost is low, the obtained Cu-DAAQ-TP-COF catalytic material has the advantages of structural stability, large specific surface area, strong visible light response ability, high carrier separation efficiency and rich catalytic active site.

The invention discloses a preparation method and application of a high-dispersion cobalt modified nitrogen-sulfur co-doped hierarchical pore carbon composite material, and belongs to the technical field of electro-catalytic materials. The preparation method comprises the following steps: carrying out sulfating modification on chitosan to prepare positioned sulfonated chitosan; adding the positioning sulfonated chitosan into a solution containing Ca < 2 + > and Co < 2 + >, uniformly stirring, and curing to obtain a positioning chitosan sulfonate mixture; and roasting the positioned chitosan sulfonate mixture in an inert atmosphere, and carrying out acid leaching on a roasted product to prepare the high-dispersion cobalt-modified nitrogen-sulfur co-doped hierarchical pore carbon composite material. The high-dispersion cobalt-modified nitrogen-sulfur co-doped hierarchical pore carbon composite material provided by the invention is simple in preparation process and good in electrocatalytic activity and stability, and can be used as an electrocatalyst of a secondary zinc air battery.

The invention discloses a porous iron-based material and application of the porous iron-based material coupled with microorganisms in wastewater treatment, and belongs to the technical field of wastewater treatment. The porous iron-based material is obtained by mixing composite carbon nitride with a carbon source and an iron source and then performing high-temperature reduction, the composite carbon nitride is prepared by taking melamine, ammonium phosphate and thiourea as precursors through a thermal polymerization method; the carbon source comprises tannic acid, glucose and chitosan; the iron source comprises ferric chloride hexahydrate; the prepared porous iron-based material is good in stability, and when the porous iron-based material is placed in a bioreactor inoculated with activated sludge, efficient degradation of antibiotics in wastewater can be effectively achieved.

The application belongs to the field of catalytic materials, and specifically discloses a preparation method of a nano high-entropy alloy material and application of the material in oxygen electrocatalysis. The preparation method is as follows: a multi-metal organic complex, a reactive metal and a molten salt are mixed and calcined, and then subjected to simple water washing treatment and alkali washing modification treatment to obtain the nano high-entropy alloy material; the multi-metal organic complex is a complex formed by a metal M source and an organic complexing agent, and the metal M contains five or more than five kinds of Fe, Co, Ni, Cr, Mn, Cu, V, Mo, Ti, Au, Ag, Pt, Pd, Ru, Ir and Rh. The application also includes the material prepared by the preparation method and application of the material in OER / ORR catalysis. The material prepared by the method has excellent OER / ORR catalytic activity and stability.

The invention discloses an advanced oxidation catalyst based on Mn3N2 and a preparation method, and belongs to the field of advanced oxidation catalysis of heterogeneous catalysts, synthesis of a precursor is completed by means of two steps of low-temperature water bath pre-coordination and hydrothermal synthesis, PVP is added in batches in a low-temperature water bath stage and a hydrothermal stage, and the precursor is prepared through a hydrothermal synthesis method. The effects of protecting the low-dimensional crystal nucleus and preventing the nano-particles from growing are respectively achieved. And calcining to obtain the Mn3N2 nano-particle catalyst with high dispersion and high specific surface area. The Mn3N2 catalyst prepared through the method is high in efficiency and large in catalytic activity specific surface area, the anchoring effect of nitrogen atoms on manganese ions is high, metal ions are not prone to being dissolved out, and meanwhile synthesis of Mn3N2 does not depend on large equipment and is simple and easy to implement.

The application discloses an electrochemical functional modification method of a supported catalyst, a material and an electrode, relates to the cross technical field of new energy materials and high-value utilization of chemical resources, and the method comprises the following steps: pretreating a supported catalyst to obtain a catalyst matrix; uniformly mixing and compounding the catalyst matrix, an organic carbon source and a solid nitrogen source to prepare a precursor composite; placing the precursor composite in an inert or weakly reducing atmosphere, performing multi-stage programmed temperature heating treatment to obtain a pyrolysis product; and performing post-treatment on the pyrolysis product after cooling to obtain an electrochemical functional modification material. The scheme can solve the intrinsic functional defects of the industrial supported catalyst, convert the supported catalyst into a high-performance electrochemical functional modification material, and directly use the material as an electrochemical oxygen electrode, thereby greatly reducing the preparation cost of the oxygen electrode material and being beneficial to large-scale commercial application of electrochemical energy devices.

The invention discloses an anion exchange membrane electrolysis water / seawater hydrogen production catalyst, a preparation method, an electrolytic bath and an electrolysis method. The preparation method of the catalyst comprises the following steps: S1, carrying out ultrasonic cleaning and vacuum drying on foamed nickel to obtain pretreated foamed nickel; s2, immersing the pretreated foamed nickel into the deposition liquid, performing deposition preparation by adopting a cathode cyclic voltammetry deposition method under a three-electrode system, taking out and cleaning the deposited foamed nickel, and performing vacuum drying to obtain nickel-cobalt-manganese hydrotalcite; s3, putting the obtained nickel-cobalt-manganese hydrotalcite into a reaction kettle filled with a selenylation solution, putting the reaction kettle into a drying oven, carrying out heat preservation reaction, naturally cooling to room temperature after the reaction is finished, washing, and carrying out vacuum drying to obtain a nickel-cobalt-manganese selenide precursor; and S4, putting the obtained nickel cobalt manganese selenide precursor into a plasma cleaning machine, and treating the front surface and the back surface with plasma to obtain the nickel cobalt manganese selenide. The catalyst not only has excellent seawater electrolysis hydrogen evolution catalytic activity, but also has excellent oxygen evolution catalytic activity.

The invention discloses a graphite-phase carbon nitride material with N defects as well as a preparation method and application of the graphite-phase carbon nitride material. The graphite phase carbon nitride material has N defects, the microstructure is of a two-dimensional porous structure, and the N defects comprise N vacancies and cyano groups. The specific surface area of the carbon nitride material is 95.93 m < 2 > / g, and the pore volume is 0.35 cm < 3 > / g. In a water decomposition hydrogen production performance test, the hydrogen production performance of the catalyst is remarkably improved compared with that of original g-C3N4, the hydrogen production rate of the catalyst in a photocatalytic full water splitting experiment can reach 2.78 mmol.g <-1 >. H <-1 > at most, the hydrogen production rate of the catalyst in a photocatalytic half water splitting experiment with a trace amount of sacrificial agent can reach 50.84 mmol.g <-1 >. H <-1 > at most, and the hydrogen production efficiency of the catalyst in a photocatalytic half water splitting experiment with a trace amount of sacrificial agent can reach 2.78 mmol.g <-1 >. H <-1 > at most. The preparation method has the advantages of being simple in process, low in cost, easy to control and the like, and industrial application is facilitated.