61 results about "Polyoxometalate I" patented technology

The invention belongs to the technical field of preparation and application of materials, and particularly discloses a method for coating the surface of polyoxometallate with titanium dioxide and application, and the method comprises the following steps: providing polyoxometallate; according to the method, titanium source injection, inert gas purging, reaction gas injection and inert gas re-purging are used as an ALD cycle, multiple cycles are carried out under the same condition, and the titanium dioxide coating layer is deposited on the surface of polyoxometallate. The obtained titanium dioxide coating layer is compact and uniform, the polyoxometallate and the titanium dioxide coating layer cooperate with each other when the titanium dioxide coating layer is applied to the photocatalytic carbon dioxide reduction reaction, the catalytic activity is remarkably improved, and the defects that existing polyoxometallate is poor in stability, prone to agglomeration and the like are overcome in a targeted mode.

The invention relates to the technical field of nano-enzymes, and discloses a copper-based nano-enzyme with laccase and peroxidase double-enzyme activity and preparation and application thereof, and the copper-based nano-enzyme is a nano-material prepared by forming MOF through solvothermal reaction of copper ions and diamino terephthalic acid and then performing electrostatic adsorption on the MOF and polyoxometallate. The copper-based nano enzyme has high-efficiency laccase-like activity and peroxidase-like activity at the same time through the combination and synthesis process of the copper ion cluster and the organic ligand. The invention further discloses a preparation method of the copper-based nano-enzyme, peroxidase activity detection and application of the copper-based nano-enzyme to degradation and determination of dichlorophenol. The copper-based nano-enzyme provided by the invention has high catalytic activity and stability, is low in cost and easy to prepare, and can be applied to biosensing detection of hydrogen peroxide and environmental remediation degradation of organic pollutants such as phenols and dyes.

This invention discloses a polyoxometalate that catalyzes the Knoevenagel reaction, its preparation method, and its applications. The chemical formula of the polyoxometalate that catalyzes the Knoevenagel reaction is: H3[K(H2O)6][K2(H2O) 10 ]2[Cu(en)2(H2O)2][Cu(en)2(Nb6O 19 Cu(en))2·24H2O, where en = ethylenediamine; the polyoxometalate crystals catalyzing the Knoevenagel reaction belong to the triclinic crystal system with space group P-1; the polyoxometalates catalyzing the Knoevenagel reaction prepared in this invention exhibit excellent heterogeneous catalytic performance in the highly efficient Knoevenagel condensation reaction, showing high yield and high stability under isothermal conditions at a 1:1 substrate ratio and over a wide substrate range. The superior catalytic ability of the polyoxometalates catalyzing the Knoevenagel reaction can be attributed to the presence of dense and effective basic sites on the surface of the heteropolycationic chain, and the increased contact frequency between the organic-inorganic hybrid catalyst and the substrate.

According to the invention, a one-pot synthesis strategy is adopted, a polyoxometallate with high proton conductivity and a pure inorganic three-dimensional frame structure is successfully synthesized by accurately controlling the reaction temperature, the pH value and the proportion of raw materials, and the chemical formula of the polyoxometallate is [H2N (CH3) 2] 8K3Na2H4 [Se4W35Ce2O124 (H2O) 4] Cl. 22H2O; based on the structural characteristics, the proton conductivity is further systematically tested under different temperature and humidity conditions; then, Arrhenius fitting is performed on experimental data, and activation energy of proton migration is calculated, so that a proton conduction mechanism is deeply discussed; the polyoxometallate prepared by the invention is of a pure inorganic three-dimensional frame structure, is completely composed of metal-oxygen bonds, and has important structural innovation significance; in addition, the polyoxometallate has the advantages of high proton conductivity, simple preparation process, good chemical stability and the like, so that the polyoxometallate becomes a solid proton conduction material with great application potential.

The present application belongs to the technical field of tire manufacturing, and particularly relates to an antiskid tire and a preparation method thereof. The antiskid performance of the tire is significantly improved by adding cerium-doped polyoxometalate-based layered compounds and nitrogen-sulfur co-modified zirconium-based MXene layered compounds in the tread compound. The cerium-doped polyoxometalate-based layered compounds are prepared by hydrothermal reaction and calcination treatment using disodium hydrogen phosphate, sodium molybdate, cerium nitrate and hexanediamine as raw materials. The nitrogen-sulfur co-modified zirconium-based MXene layered compounds are prepared by etching, peeling and co-calcination with thiourea after synthesizing ceramics using titanium powder, aluminum powder, zirconium powder and carbon powder as raw materials. When preparing the tire, the rubber is first mixed with carbon black, the two modified compounds and the additives to obtain a masterbatch, then the vulcanization system components are added to obtain a final rubber compound, and finally the finished product is obtained through extrusion, lamination and vulcanization molding. The antiskid tire prepared by the present application has excellent grip on wet and icy road surfaces.

The invention discloses a method for enhancing plant salt stress resistance based on a polyoxometallate-rhizosphere bacterium composite system. The method comprises the following steps: step 1, preparing a polyoxometallate nanocluster with enzyme-like activity; step 2, carrying out surface modification on the polyoxometallate by adopting polyethyleneimine; step 3, loading the modified polyoxometallate on the surfaces of rhizosphere microorganisms to construct a polyoxometallate-rhizosphere bacterium composite system; 4, applying the composite system to plants under the salt stress condition so as to relieve salt stress and promote plant growth. The method has the advantages that the method for regulating and controlling the salt stress resistance of the plants is simple and convenient to operate and high in practicability; by synergistically exerting the effects of removing active oxygen and promoting growth of rhizosphere microorganisms of the polyoxometallate, oxidative damage induced by salt stress is effectively reduced; the method is good in biocompatibility and suitable for plant growth regulation and control under the salt stress condition.

This invention belongs to the field of catalyst technology, specifically relating to a polyoxometalate-anchored cobalt single-atom catalyst, its preparation method, and its application. The invention uses a polyoxometalate as the anchoring substrate and electronic control unit. First, a cobalt-substituted polyoxometalate precursor is prepared via a coordination reaction, then composited with a ZIF-derived conductive carbon substrate, and finally reduced with hydrogen to obtain the target catalyst. This catalyst effectively inhibits cobalt single-atom aggregation, achieving a cobalt single-atom loading of 3.55 wt%. Under alkaline conditions, it exhibits excellent oxygen reduction catalytic activity, stability, and methanol resistance, with a half-wave potential of 0.826 V. When used in a zinc-air battery, it achieves an open-circuit voltage of 1.48 V and a flow rate of 239.6 mW / cm². 2 With maximum power density and excellent cycle stability, it can replace commercial platinum-carbon catalysts.

The invention relates to a graphene supported catalyst, a preparation method thereof and a method for catalyzing epoxidation of cyclododecatriene. The catalyst prepared by taking graphene and polyoxometallate as raw materials has excellent cyclic macromolecular catalytic activity; when the catalyst is used in the epoxidation reaction of macrocyclic olefin, the raw material conversion rate and the selectivity to a target product can be obviously improved.

The invention discloses a polyacid-hydrogel derived atomic-scale Pt modified Mo2C electrocatalyst for electrocatalytic hydrogen evolution and a preparation method of the polyacid-hydrogel derived atomic-scale Pt modified Mo2C electrocatalyst, and belongs to the technical field of new energy materials. Polyoxometallate is used as a precursor, the polyoxometallate is loaded on the surface of cationic polyvinyl alcohol-chitosan hydrogel modified carbon cloth by using the anion characteristic of the polyoxometallate, and the monodisperse Pt atom-doped Mo2C composite material loaded on the nitrogen-doped carbon surface is obtained through high-temperature heat treatment. The material prepared by the invention has excellent electro-catalytic hydrogen evolution performance, even the activity exceeds that of commercial platinum carbon, and the material has important guiding significance on preparation of an electro-catalytic hydrogen evolution catalyst.

The application provides a kind of dual active site polyacid metal organic framework compound photocatalyst and its preparation method and application, it is related to photocatalyst preparation field.The preparation method includes: Keggin type polyoxometalate, chromium nitrate, terephthalic acid are mixed to obtain mixed solution;The molar ratio of Keggin type polyoxometalate, chromium nitrate, terephthalic acid is (0.01-0.10) : 1: 1;The obtained mixed solution is stirred at room temperature, and then the reaction product is obtained by solvothermal reaction, extraction, to obtain dual active site polyacid metal organic framework compound photocatalyst;Wherein, the molecular formula of the Keggin type polyoxometalate is H4SiW 12‑X Mo X O 40 , X=0-12.The obtained photocatalyst can be used for photocatalytic synthesis of urea with water, nitrogen and carbon dioxide at room temperature and normal pressure, the Keggin type polyoxometalate is H4SiW6Mo6O 40 , and the urea yield can reach 1148 μg·h ‑1 ·g ‑1 cat , and the recycling performance is excellent.

This application provides an aqueous zinc-ion battery separator, its preparation method, and its application. The separator includes a membrane body and a polyoxometalate present in the membrane body; the membrane body includes nanocellulose and has a cross-linked structure formed by cross-linking nanocellulose through the polyoxometalate. This cross-linked structure exhibits a superionization effect, which can disrupt the hydrogen bond network of water in the electrolyte, thereby weakening the solvation effect of water, significantly increasing the entropy of the electrolyte, inhibiting parasitic reactions and dendrite growth, enhancing the reversibility of zinc ion stripping and deposition, and thus improving the cycle stability of the battery; in addition, the separator with this cross-linked structure has a uniform pore size distribution and good mechanical strength and zinc ion transport performance.

Provided is an Anderson-type polyoxometalate including titanium (Ti) as a heteroatom in the center of the Anderson-type polyoxometalate. A method for preparing an Anderson-type polyoxometalate includes mixing a titanium precursor and a tungsten precursor to prepare a mixture, sealing the mixture in a container and heating to form a hydrothermal synthetic solution, and cooling the hydrothermal synthetic solution and then adding a solute to form an Anderson-type polyoxometalate.

The application provides a preparation method of an ion complex and a supramolecular framework assembly, an artificial solid electrolyte interface phase and a zinc metal anode, and belongs to the field of supramolecular framework assemblies. The ion complex is prepared through ion interaction of a polyoxometalate cluster, coordination of zinc ions and cationic terpyridine and hydrogen bonding of grafted carboxyl groups, so that the three-dimensional SF is constructed in a good crystalline state. The three-dimensional growth of the framework of the ion complex is beneficial to improving the structural stability, while the unique performance is maintained. The ion complex can grow in situ on the zinc surface and further extend laterally to form a defect-free full coverage layer. Through dissolution and post-coordination effect, the 3D SF layer is used as an artificial solid electrolyte interface to improve the performance of the zinc anode. The clusters uniformly distributed in the nanopores of the ion complex form negatively charged nanochannels, which can accelerate the transfer of zinc ions and make the zinc deposition uniform.

The application discloses a Standberg type polyoxometalate-based organic-inorganic compound for catalytic oxidative desulfurization, a synthesis method and application, and has a molecular formula of [Zn(H2datrz)2(P2Mo5O 23 )(H2O)2]·11H2O.The synthesis method comprises the following steps: in step one, zinc acetate, 3,5-diamino-1,2,4-triazole, sodium molybdate and deionized water are mixed to be homogeneous; the molar ratio of zinc acetate to deionized water is 1:173, the molar ratio of 3,5-diamino-1,2,4-triazole to sodium molybdate is 1:1, and the molar ratio of 3,5-diamino-1,2,4-triazole to zinc acetate is 4:3; in step two, the pH value is adjusted to 2.5-3, and after stirring, heating and hot filtration are carried out; and in step three, the filtrate is placed at room temperature for one week to obtain the product.The application has the characteristics of low cost, high yield and high catalytic efficiency.

The invention belongs to the technical field of preparation of polyoxometallate materials, and discloses a polyoxometallate nano-catalyst constructed by a trinuclear ruthenium cluster and application of the polyoxometallate nano-catalyst. The preparation method of the catalyst comprises the following steps: adding Keggin type polyacid, ruthenium trichloride and a 1, 2, 4-triazole ligand into a buffer solution, and inducing coordination of the polyacid, ruthenium and 1, 2, 4-triazole to perform self-assembly under a hydrothermal condition by precisely regulating and controlling the pH value of the solution so as to form a trinuclear ruthenium cluster active center. The catalyst provided by the invention can be applied to a reaction process for preparing urea through electro-catalysis C-N coupling, and has high yield and high selectivity.

The invention discloses a cerium-based polyoxometallate / metal organic framework-based composite nano-enzyme as well as a preparation method and detection application of the cerium-based polyoxometallate / metal organic framework-based composite nano-enzyme. The composite material is prepared by reacting ferric chloride, cerium-based polyacid and 2-aminoterephthalic acid, and has excellent peroxidase-like activity, stability and substrate affinity. Based on the material, the invention further develops a recyclable paper-based detection device, and the paper-based detection device is matched with a smart phone color recognition system to construct a rapid colorimetric detection platform for the antioxidant. The platform can realize high-sensitivity and high-selectivity detection of various antioxidants such as ascorbic acid, glutathione, gallic acid and the like, and is successfully applied to total antioxidant capacity analysis of actual samples such as fruits and the like. Compared with a traditional method, the method has the advantages of being rapid in detection, easy and convenient to operate, low in cost, environmentally friendly and the like, and is suitable for the field of food safety on-site rapid monitoring.

The application discloses a polyoxometalate composite N-doped carbon quantum dot and a preparation method and application thereof, and belongs to the technical field of photocatalytic nanocomposite material preparation methods. The preparation method of the polyoxometalate composite N-doped carbon quantum dot is as follows: mixing a molybdate and water to obtain a molybdate aqueous solution; mixing a transition metal salt, a hydrogen peroxide solution and water to obtain a mixed solution; heating the molybdate aqueous solution to boiling, then adding the mixed solution, and filtering to obtain a polyoxometalate precursor hot solution; mixing and stirring the polyoxometalate precursor hot solution and an N-doped carbon quantum dot aqueous solution, cooling to room temperature, standing, washing and drying the precipitate to obtain the polyoxometalate composite N-doped carbon quantum dot. The polyoxometalate composite N-doped carbon quantum dot prepared by the application has a syngas CO and H2 yield ratio of 1.3:1 and a yield of >40000 mu mol.g ‑1 ·h ‑1 in a photocatalytic carbon dioxide reduction reaction.

The application belongs to the field of catalytic materials and technology, and particularly relates to a Ni-Anderson polyoxometalate catalyst and a preparation method and application thereof. 26 The Ni-Anderson type polyoxometalate catalyst TBA2NiMo6 is obtained through one-step reaction of TBA4Mo8O, 1,1,1-tris(hydroxymethyl)ethane and Ni(OAc)22H2O, and is used in a coupling reaction of organic iodine and phenol to synthesize diphenyl ether. The application overcomes the technical difficulties of the coupling reaction, such as the use of noble metals and high-cost, toxic, air / moisture-sensitive high-usage organic ligands causing environmental pollution, the catalyst being unable to be recycled, and low catalyst conversion rate. The obtained catalyst has good catalytic activity, stability and durability, is green and mild, inexpensive and easy to prepare, and has a long service life. Moreover, the catalytic oxidation reaction can be easily expanded to a gram level, and has good industrial application potential.

The application discloses application of a two-dimensional polyoxometalate nanomaterial, and the two-dimensional polyoxometalate nanomaterial is applied to photocatalytic degradation of organic dyes; the two-dimensional polyoxometalate nanomaterial has a sheet layer structure; and the sheet layer structure is formed by polyoxometalate clusters arranged in a hexagonal shape. Through the application, the degradation of dyes can be realized quickly and efficiently, the two-dimensional polyoxometalate nanomaterial used has excellent cycle stability, and the production cost of dye degradation is greatly saved.

The application discloses a porous chromium-based composite denitration catalyst and a preparation method and application thereof, and belongs to the technical field of denitration catalyst preparation. The preparation method of the porous chromium-based composite denitration catalyst is as follows: a chromium salt, an organic ligand and an Anderson-type polyoxometalate are dissolved in water to perform a hydrothermal reaction to obtain a precursor; wherein the Anderson-type polyoxometalate is selected from one or more of (NH4)4[NiMo6O 24 H6]·5H2O, (NH4)3[CoMo6O 24 H6]·7H2O or (NH4)3[FeMo6O 24 H6]·6H2O; and the precursor is calcined, and the porous chromium-based composite denitration catalyst is obtained. Compared with a single MOF porous chromium-based catalyst, the denitration efficiency of the porous chromium-based composite denitration catalyst can be increased by more than 90%. Meanwhile, the preparation method is simple, easy to control, low in requirement on a synthesis device, can save the amount of active components, reduces the production cost of the catalyst in an all-round way, and is suitable for large-scale industrial production.

The invention provides an organic-inorganic nano composite pipeline thermal insulation material and a preparation method and application thereof, and the organic-inorganic nano composite pipeline thermal insulation material comprises the following raw materials: a linear high-molecular polymer, an organic / inorganic nano composite dispersant, a cement component, a hydrophobic component, a foaming component and an organic solvent, the organic / inorganic nano composite dispersant is prepared by carrying out a conventional free radical copolymerization reaction on an organic monomer and a modified halloysite nanotube and then carrying out electrostatic interaction with polyoxometallate. Cement, an organic / inorganic nano composite dispersing agent and a linear high-molecular polymer are used as raw materials, and cement hydration products are induced to nucleate in a solution of the linear high-molecular polymer and the organic / inorganic nano composite dispersing agent through a directional freezing method to prepare the aerogel. The organic / inorganic nano composite aerogel with a three-dimensional network structure and multiple functions is realized, and can be used as a composite heat preservation and insulation material for a multi-scene pipeline.

Chemical compound, encompassing • Carbon nanotubes to which a polyoxometalate molecule (POM) is bound, • the polyoxometalate molecule (POM), and • an aptamer (APT) wherein the polyoxometalate molecule (POM) is covalently bound to the aptamer (APT) by means of a triazole ring.

The invention belongs to the technical field of catalysts, and particularly relates to a palladium-polyoxometallate cluster-cluster catalyst as well as a preparation method and application thereof. The palladium-polyoxometallate cluster-cluster catalyst is formed by self-assembly of a sub-nanometer Pd cluster derived from a palladium precursor and polyoxometallate, and the polyoxometallate is phosphotungstic acid (PW12), phosphomolybdic acid (PMo12), undecanoyl molybdenum-vanadium phosphate (PMo11V1), decamolybdenum divanadium phosphate (PMo10V2) or non-molybdenum trivanadium phosphate (PMo9V3). The invention provides a stable palladium-polyoxometallate self-assembled cluster-cluster catalyst which is prepared in one pot, has sub-nano Pd clusters and is used for preparing ketone through low-temperature, low-pressure and high-selectivity hydrogenation.

The application provides a molybdenum-based polyoxometalate-hemin composite nanomaterial and a preparation method and application thereof, and the method comprises the following steps: under room temperature conditions, molybdenum-based polyoxometalate and hemin are mixed by means of manual grinding, and then the obtained mixture is sequentially subjected to centrifugal separation, washing and vacuum drying, so that a solid-phase molybdenum-based polyoxometalate-hemin composite nanomaterial is prepared. 12 The nanocomposite material is synthesized by a simple manual grinding method, and is prepared through the steps of room temperature grinding, centrifugal separation, washing and vacuum drying without the need of complex equipment, high temperature and high pressure or toxic organic solvents. 12 The colorimetric sensor constructed by the nanocomposite material can rapidly and accurately quantitatively detect the AA content in fresh fruits, and has a wide application prospect in the fields of food nutrition analysis, quality control and on-site detection.

The invention discloses a polycarboxylic acid organic-inorganic hybrid admixture, a preparation method thereof and application of the polycarboxylic acid organic-inorganic hybrid admixture in calcined clay-limestone low-carbon cement. The polycarboxylic acid organic-inorganic hybrid admixture is prepared by the following steps: copolymerizing a monomer A, a monomer B and a monomer C, grafting amino crown ether through amidation reaction, and then performing electrostatic interaction with polyoxometallate. The monomer A is unsaturated carboxylic acid or unsaturated carboxylate, the monomer B is acrylic acid-N-succinimide ester, and the monomer C is methacryloyl propyl trimethyl ammonium chloride or acryloyl propyl trimethyl ammonium chloride. According to the invention, a rigid benzene ring structure of crown ether is utilized to generate strong steric hindrance, and the crown ether and POM nanoparticles form a compact cross-linked network structure together, such a spatial cross double network physically obstructs intercalation adsorption of clay, intercalation adsorption of the admixture between clay layers is doubly obstructed, and the adaptability of the admixture is significantly improved.

The application belongs to the technical field of polyoxometalate material preparation, and discloses a trinuclear ruthenium cluster constructed polyoxometalate nanocatalyst and application thereof. The preparation method of the catalyst comprises the following steps: adding a Keggin type polyacid, ruthenium trichloride and a 1,2,4-triazole ligand into a buffer solution, precisely controlling the pH of the solution, and inducing the self-assembly of the polyacid, ruthenium and the 1,2,4-triazole ligand under hydrothermal conditions to form a trinuclear ruthenium cluster active center. The catalyst provided by the application can be applied to the reaction process of electrocatalytic C-N coupling for preparing urea, and has high yield and high selectivity.

The application discloses an ordered mesoporous tungsten disulfide semiconductor material and a preparation method and application thereof. The application adopts an amphiphilic block copolymer as an organic template agent, a polyoxometalate cluster as a tungsten source, and performs co-assembly in a double solvent system (an organic solvent / water) to obtain spherical core-shell composite micelles. After solvent evaporation, the micelles are deposited on a substrate to obtain an organic-inorganic composite film. The organic-inorganic composite film is first calcined at high temperature in an air atmosphere to obtain mesoporous tungsten trioxide. Then, the mesoporous tungsten trioxide is high-temperature sulfurized and reduced in an inert atmosphere by using sulfur powder as a sulfur source to obtain the ordered mesoporous tungsten disulfide material. The raw material is easy to obtain, the preparation process is simple, easy to repeat, and easy to control, the preparation parameters are easy to adjust, and the large-scale production can be easily realized.

Embodiments of a flame retardant compound are provided. The flame retardant compound includes a polymer base resin and a flame retardant additive distributed within the polymer base resin. The flame retardant additive includes inclusion complexes that are made of at least one guest molecule and at least one carbonific host molecule. The at least one guest molecules is a polyoxometalate ionic liquid. The flame retardant compound achieves a limiting oxygen index of at least 25% according to ISO 4589. Additionally, embodiments of a flame retardant cable are provided that utilize the flame retardant compound as a jacketing material.

The application discloses an upgrading utilization method of polyester plastics and a coupled hydrogen production process. The method comprises the following steps: using a polyoxometalate as a catalyst, and using an organic acid or an inorganic acid and / or a metal ion with oxidizing property as a cocatalyst, and hydrolyzing the polyester plastics into TPA, EG and FA. The method provided by the application can convert the polyester plastics into TPA and EG under mild conditions, and the EG can be further converted into FA. The application further provides an upgrading utilization and coupled hydrogen production process of polyester plastics. The polyester plastics are hydrolyzed in an anode tank, the polyoxometalate with oxidizing property is regenerated through coupling electrolysis, continuous production is realized, and hydrogen is produced through electrolysis in a cathode. The method and the process provided by the application have high degradation rate of the polyester plastics and are green and environment-friendly. Compared with water electrolysis, the hydrogen production in the cathode can save more than 50% of electric energy for producing the same volume of hydrogen.

The present application belongs to the technical field of oil and gas drilling engineering, and particularly relates to a polymer-coated inhibitor for strong inhibition drilling fluid and a preparation method thereof; the inhibitor is prepared by aqueous solution polymerization of acrylamide, acrylamidomethylpropane sulfonic acid, dimethyldiallylammonium chloride, vinyltrimethoxysilane and two novel inorganic modified compounds. The two inorganic modified compounds are a titanate intercalated magnesium aluminum tin silicate nanocomposite and a polyoxometalate grafted rare earth doped cerium dioxide nanorod, respectively. The former is prepared by coprecipitation and intercalation reaction, and the latter is prepared by hydrothermal synthesis and graft modification. The present application significantly improves the hydration inhibition capacity for shale, and can still maintain stable coating effect in high temperature and high salt environment, effectively solving the problem of wellbore instability. The preparation method is simple in process, the raw materials are all commercially available, and is suitable for industrial production, and has a broad application prospect in the field of water-based drilling fluid.