47 results about "Polyoxometalate" patented technology

The invention is applicable to the technical field of catalyst preparation, and provides a nano composite material for producing H2O2 through photocatalysis and a preparation method, the nano composite material comprises titanium dioxide, nitrogen-doped carbon quantum dots and polyoxometallate, and the general formula is TiO2 / NCDx / POMy; wherein x is an integer from 1 to 4, and y is an integer from 10 to 100. According to the method, through the synergistic effect of the titanium dioxide, the nitrogen-doped carbon quantum dots and the polyacid, the self limitation and defects of the titanium dioxide in the photocatalytic H2O2 production process are effectively overcome, and the H2O2 yield is remarkably improved. Meanwhile, the composite material can still keep stable catalytic performance in a wide pH range, and a new thought is provided for solving the problem that titanium dioxide is limited by the pH environment in the process of producing H2O2 through photocatalysis.

The invention discloses a polyacid-based metal viologen framework crystalline material as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials. The crystalline material is synthesized in one step through a hydrothermal method, the molecular formula is Cu2 (H2O) 2 (L) 2 [PW12O40] [OH]. 2H2O, the crystalline material belongs to a monoclinic system, the space group is P21, the cell parameters are alpha = 90 degrees, beta = 114.208 (2) degrees and gamma = 90 degrees, and the structure of the crystalline material is determined through X-ray diffraction. According to the material, accurate compounding of polyacid clusters and metal viologen on the molecular level is achieved, an effective electron transmission channel is constructed, separation of photon-generated carriers is remarkably promoted, and excellent photocatalytic activity is shown. At the ambient temperature, the crystalline material can be used as a catalyst to efficiently degrade dye pollutants (such as methylene blue and rhodamine B) in a water body, the degradation rate within 60 minutes exceeds 90%, and the crystalline material has good cycle stability and structural durability.

The application discloses a preparation method and application of PTFE catalytic filter material, and the preparation of the PTFE catalytic filter material comprises MnCeTi catalyst preparation, PTFE catalytic fiber preparation, heteropoly acid functionalization and needling. The three-dimensional flower-shaped spherical structure of the prepared PTFE catalytic filter material is used to optimize the mass transfer and conversion channel of pollutants, the intermetallic interaction of Mn, Ce and Ti is used to regulate the surface acid sites and active sites of the catalyst, the surface oxygen vacancies, acid sites and other characteristics are further optimized through the heteropoly acid functionalization, and the low-temperature catalytic dioxin performance of the PTFE catalytic filter material is effectively improved. Meanwhile, the heteropoly acid can form polyoxometalate on the surface of the catalyst, the adhesion strength of the catalyst and the filter material is strengthened, the loss problem of the catalyst in the use process is effectively relieved, and the prepared PTFE catalytic filter material has high efficiency and long-term use performance.

The application discloses a preparation method and application of a polyacid tannic acid modified ultrafiltration membrane, and the preparation method comprises the following steps: preparing a casting solution containing a high molecular film forming material and a solvent; adding a polyoxometalate into the casting solution, uniformly mixing, and obtaining a polyacid modified casting solution; scraping and coating the polyacid modified casting solution to form a liquid membrane, pre-evaporating, immersing into a coagulation bath containing tannic acid to perform phase inversion and film forming, and obtaining the polyacid tannic acid modified ultrafiltration membrane. Through the synergistic effect of the polyacid blending regulation of the membrane pore structure and the in-situ coordination modification of the tannic acid phase separation, the simultaneous improvement of the permeation flux and the retention rate is realized, the pure water flux of the obtained ultrafiltration membrane reaches 221.37 LMH, the bovine serum albumin retention rate reaches 96.17%, and the preparation process is simple, efficient, and has a good large-scale application prospect.

POM particles are suitable as photocatalytic or electrocatalytic catalyst in the production of hydrogen and a method of producing such POM particles. The POM particles are produced by subjecting a heteropoly acid with the chemical formula HzXY12O40, or a hydrate thereof, to acidic conditions in the presence of a polyvalent cation, wherein z=3 or 4, X is selected from the group consisting of P, Si, Ge, As, Sb and V, and Y is selected from the group consisting of W, Mo and V.

The application discloses a kind of high-efficiency heterogeneous catalyst for CO2 ring addition preparation cyclic carbonate and its preparation method and application, belong to catalyst technical field.The high-efficiency heterogeneous catalyst is transition metal doped polyoxometalate coordination polymer, chemical general formula is C 16 H 58 M2N2Na2O 48 V 10 Wherein, M is selected from Co 2+ , Ni 2+ , Cu 2+ Or Zn 2+ Its preparation method is: sodium vanadate, transition metal acetate and bis (2-hydroxyethyl) amino (trihydroxymethyl) methane ligand are dissolved in water with pH being 1~3, stirring reaction, after filtration, crystallization is stationary, and is obtained.In the ring addition reaction of CO2 and epoxide, the catalyst and cocatalyst tetrabutylammonium bromide synergistic effect, catalytic yield can be up to 98.2%, selectivity is more than 99%, and catalytic activity still remains at 88% after recycling five times.

Gels and aerogels are provided that comprise one or more polyoxometalate (POM)– complexed nanocrystal cores formed from metal oxides, metal hydroxides, and / or metal oxyhydroxides. Coordination of the nanocrystal surfaces by POM cluster anions imparts enhanced structural stability, surface accessibility, and electronic tunability relative to non- complexed materials. As a result, the POM-complexed nanocrystals exhibit improved performance in chemical, electrochemical, photochemical, and photoelectrochemical processes. Conversion of the POM–nanocrystal complexes into gel and aerogel architectures further enhances reactivity and functional versatility by providing interconnected, high-surface- area networks that retain exposed, catalytically active inorganic surfaces.

This invention discloses a chemiluminescence gas sensor based on polyoxometalates (POMs), and relates to its fabrication method and application. The sensor is suitable for detecting ammonia at room temperature. The gas sensor includes an adapter base and a sensing element, wherein the sensing element consists of interdigitated electrodes and a sensitive material loaded on the electrode surface. This sensitive material is a composite material of POMs and SnO2. POMs, as excellent electron acceptors, possess good redox properties, thermal stability, and photosensitivity. When combined with SnO2, they can effectively suppress electron-hole recombination, thereby significantly improving the gas-sensing performance of the semiconductor material. Compared with existing technologies, the sensor provided by this invention exhibits high response characteristics to ammonia at room temperature, while also demonstrating excellent selectivity and repeatability.

The invention discloses a transition metal atom doped molybdenum disulfide nanosheet as well as a preparation method and application thereof, and relates to the technical field of nano materials. A molybdenum-containing multi-metal oxygen cluster is used as a precursor, a transition metal atom doped molybdenum disulfide nanosheet electrocatalyst with high activity sites is prepared through a hydrothermal method, a battery diaphragm is modified by the transition metal atom doped molybdenum disulfide nanosheet electrocatalyst, and the purposes of sulfur fixation and polysulfide conversion reaction promotion are achieved at the same time. The preparation method of the nanosheet is simple and easy to implement, the polysulfide shuttling inhibition effect and the catalytic effect are obvious, and the cycle performance of the battery is obviously improved.

This invention discloses a method for screening catalysts for the oxygen evolution reaction based on electrochemiluminescence quenching. The catalyst to be tested is loaded onto the working electrode, and then Ru(bpy)3 is added. 2+ In the electrolyte of / Hepes, applying an anodic potential to excite ECL accelerates the OER to generate O2, and O2 quenches the ECL signal. The signal intensity is negatively correlated with the catalytic activity. This method can be used for parallel detection on a single-electrode imaging array, achieving high throughput, visualization, and quantitative screening. It is applicable to various OER catalysts such as polyoxometalates and oxides, and has the advantages of being fast, low-cost, and easy to operate.

The application discloses a kind of plasma electron sponge nanochannel composite membranes and preparation method and application thereof, the composite membrane includes a layer of self-assembled arrangement plasma electron sponge film and a layer of membrane material with large pore structure, part of the pore in the self-assembled arrangement plasma electron sponge film and part of the large pore in the membrane material with large pore structure are communicated correspondingly, and electron sponge refers to polyoxometalates (POMs). The application first uses plasma electron sponge nanomaterial as functional material to make nanochannel composite membrane, and plasma electron sponge has excellent and stable performance, mild preparation condition, simple operation and green environmental protection. In addition, the plasma electron sponge nanochannel composite membrane prepared by the application can be used as ion selective membrane in salinity gradient energy conversion, and has the advantages of excellent and stable performance, high conversion power and green environmental protection.

The present invention relates to a catalytic article comprising a substrate and a catalytic composition disposed on the substrate, the catalytic composition comprising a support material on which one or more platinum group metals (PGMs) and a Ta-polyoxometalate (POM) are supported.

Disclosed are coatable compositions comprising a metal-(meth)acrylate hybrid material that, upon curing, forms a metal-polymer hybrid layer having a relatively high refractive index. The curable metal-(meth)acrylate hybrid composition comprises a photoinitiator, a polyoxometalate, and one of a hydroxyl-functional (meth)acrylate or a mixture of a hydroxyl-functional (meth)acrylate and an aromatic (meth)acrylate. The printable, solvent-free composition forms, upon coating, an optically transparent and metal-polymer hybrid layer having a refractive index of at least 1.52.

Complexes of polyoxometalate (POM) cluster anions and nanoparticle (NP) cores, are disclosed, featuring inherent thermodynamic stability at least due to covalent bonds, which attach the POMs to the NP cores. The nanoparticles coprise a plurality of crystalline, polycrystalline or amorphous metal-oxide, metal oxyhydroxide and / or metal hydroxide compounds. The POM and NP, each independently, may comprise one, two, three or more different metal cations, particularly transition or main group metal cations. These complexes are highly soluble in water and inherently stable to oxidation and hydrolysis in a broad pH range. As such, the complexes are usfule, inert alia, as improved soluble water-oxidation catalysts and stabilizers of metastable crystals.

The application belongs to the technical field of agricultural fungicidal active ingredients, and particularly relates to a copper-tungsten polyoxometalate and a preparation method and application thereof in the field of agricultural fungicides. The existing agricultural fungicidal POM compounds have defects such as insufficient targeted bacteriostatic activity and insufficient preparation stability. The application provides a copper-tungsten polyoxometalate compound Cu-W-POMs, which exhibits excellent fungicidal activity and can effectively inhibit the cucumber fusarium wilt pathogen. Meanwhile, the compound also has a good inhibitory effect on crop disease pathogenic bacteria such as soybean seed rot, pear black spot and apple anthracnose. In particular, the compound can be used for preparing an agricultural fungicide to prevent and control cucumber fusarium wilt and other crop diseases.

The invention relates to the technical field of electrocatalytic materials, and mainly discloses an anti-poisoning electrocatalytic ammoxidation catalyst based on a bimetallic-polyoxometallate interface and a preparation method thereof, and the catalyst is a composite material formed by in-situ growth on a pretreated nickel foam substrate through a hydrothermal method. In the bi-metal-POM structure constructed by the invention, a phosphotungstic acid anion skeleton provides a stable oxygen bridge coordination environment, Cu and Ni active centers can be anchored on the atomic scale, and agglomeration and dissolution under high potential are prevented; heterogeneous bimetal sites formed by Cu and Ni in a POM framework can realize electronic coupling regulation and control through an oxygen bridge, and through bimetal-POM interface electronic regulation and control, the method does not need an additional reducing agent or template agent, is simple in process and high in controllability, and can be expanded to a metal-PTA system of Co, Fe and the like by replacing precursor metal salt, so that the method is suitable for industrial production. The obtained catalyst can keep a uniform structure and stable electro-catalytic performance.

The invention discloses transition metal sulfide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving a molybdenum source in deionized water to obtain a solution A; (2) dissolving other metal sources in deionized water to obtain a solution B; (3) adding the solution B into the solution A, reacting, filtering, washing and drying to obtain a polyoxometallate precursor; (4) adding the polyoxometallate precursor and a sulfur source into a sealed high-temperature-resistant container, uniformly mixing, sealing in vacuum, normal pressure or pressurization, and calcining; and (5) washing and drying to obtain the transition metal sulfide. The method better inherits the morphology advantage of the precursor, the reaction time is short, the technological process is simple and safe, the use of a high-pressure closed environment and a toxic solvent is avoided, the operation risk is low, the energy consumption is low, and the problems that the emission of harmful gas is large and the utilization rate of a sulfur source is low in the vulcanization process are effectively solved; the transition metal sulfide in the sodium ion battery is good in battery rate capability and high in long-cycle constant-current charge-discharge performance stability.

The invention relates to the technical field of proton exchange membranes, and provides a sulfonated polyether-ether-ketone hybrid proton exchange membrane as well as a preparation method and application thereof. The sulfonated polyetheretherketone hybrid proton exchange membrane provided by the invention comprises a sulfonated polyetheretherketone membrane and a hybridization agent hybridized in the sulfonated polyetheretherketone membrane, the hybridization agent is a covalent grafted polyoxometalate cluster; the covalent grafted polyoxometalate cluster is an absent polyoxometalate cluster grafted by polyethylene glycol monomethyl ether trimethoxy propyl silane. The covalent grafted polyoxometalate is added into the SPEEK membrane as a hybridizing agent, the covalent grafted polyoxometalate has good compatibility with SPEEK, the proton conductivity of the membrane is improved, the vanadium ion permeability of the membrane is reduced, and the mechanical property and dimensional stability of the membrane are improved. In conclusion, the sulfonated polyether-ether-ketone hybrid proton exchange membrane prepared by the method has wide application prospects in the fields of fuel cells, all-vanadium redox flow batteries and the like.

The invention relates to the technical field of solid-state batteries, in particular to a substituted polyoxometallate solid-state electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing phosphotungstic acid hydrate with water, and adjusting the pH value to obtain an H3 [PW11O40] 2-solution; then mixing with soluble copper salt to adjust the pH (Potential of Hydrogen), so as to obtain an H3 [CuPW11O40] solution; and mixing with a lithium salt to adjust the pH value, and carrying out hydrothermal reaction to obtain the electrolyte. According to the method, metal ions are introduced through step-by-step acidification, crystallization is promoted hydrothermally, and a product with a nanorod structure is synthesized, so that the problems of uncertain product structure and low crystallinity of a traditional step-by-step acidification method are solved. The general chemical formula of the electrolyte is Li3CuPW11O40, the electrolyte has a three-dimensional continuous lithium ion transmission path, the ionic conductivity at room temperature reaches 0.9-1.0 mS / cm, and the activation energy is 0.1-0.2 eV. And a continuous lithium ion transmission network can be constructed in a solid-state battery, and the method is suitable for large-scale production.

Methods for cracking a polyolefin are provided which comprise heating a blend comprising a polyolefin and an unsupported acidic polyoxometalate in a reaction zone of a reactor chamber, the reaction zone at a reaction temperature, while flowing a gas through the blend, to induce carbon-carbon bond cleavage in the polyolefin and form a processed blend comprising cracked hydrocarbons; passing at least a portion of the processed blend to a reflux zone of the reactor chamber, the reflux zone at a reflux temperature; and collecting the cracked hydrocarbons.

The invention relates to the technical field of Keggin type polyacid compounds, and particularly discloses a Keggin type polyacid complex modified by a naphthalene diimide ligand as well as a preparation method and application of the Keggin type polyacid complex. The molecular formula of the Keggin type polyacid complex is Cu2 (H2O) 6 [BBPT] 3 [H4W12O40]. 3H2O. The invention also discloses a preparation method of the Keggin type polyacid complex. The Keggin type polyacid complex provided by the invention has excellent photocatalytic activity, when the Keggin type polyacid complex is applied to a photocatalytic CO2 reduction reaction, after illumination is performed for 9 hours, the CO yield is 1781 nmol, the mass normalization CO output rate is 6.59 nmol.mg <-1 >. H <-1 >, the CO product selectivity is about 99.7%, CO2 is efficiently and selectively reduced into CO, and the Keggin type polyacid complex has a wide application prospect in the field of solar-driven CO2 resource utilization.

The invention discloses preparation and application of a volume phase hydrogenation catalyst for dynamic acid-assisted hydrogen overflow, and the preparation method of the catalyst comprises the following steps: carrying out organic-inorganic self-assembly to obtain hybrid nanospheres with uniformly distributed metals, and carrying out solvothermal reaction on the hybrid nanospheres, polyoxometallate (POMs) and a sulfur source to construct the hydrogenation catalyst with a core-shell structure. The catalyst dissociates H2 by taking an internal nuclear phase as a donor and generates high-activity H *, and H * is rapidly transferred to an external shell layer and is captured in situ by POMs-derived acidic sites to form an efficient hydrogen overflow network. Wherein the unique structure of POMs realizes nanoscale space matching of an acidic site and an active phase, and shortens the migration distance of H *. Due to the confinement effect of the structure-directing agent, 1T-MoS2 with short plate length and low stacking is constructed, and sufficient exposure of edge sites is promoted. The core-shell structure, the acidic site and the small-size 1T-MoS2 cooperate to jointly construct a dynamic hydrogen management system of'hydrogen activation-migration-utilization ', so that efficient production of clean oil products is realized.

This invention discloses a method for preparing an MMoP@CoP / Ti3C2 heterojunction electrocatalyst based on dp orbital coupling and its application in alkaline water electrolysis for hydrogen evolution (HER) and total water electrolysis, belonging to the fields of electrocatalytic materials and new energy technology. This invention encapsulates polyoxometalates (POMs) in a cobalt-based imidazolium ester (ZIFL) framework and anchors them on Ti3C2 MXene. A strongly coupled MMoP@CoP / Ti3C2 (M=Fe, Co, Ni, Cu) heterojunction is constructed in situ via low-temperature phosphating. By precisely controlling the work function difference (ΔΦ) at the heterojunction interface to 0.06 eV through the 3d orbitals of transition metal M and the 3p orbitals of P, the interfacial hydrogen overflow barrier is significantly reduced, achieving efficient alkaline HER and stable anion exchange membrane water electrolysis (AEMWE). The obtained FeMoP@CoP / Ti3C2 exhibits high efficiency at 10 mAcm⁻¹. ‑2 The overpotential was only 58.9 mV, and the Tafel slope was 47.85 mV dec. ‑1 A symmetrical AEM electrolytic cell can achieve 1 Acm at 1.96 V. ‑2 It operates stably for 1000 hours, outperforming commercial Pt / C / / RuO2. This invention features a mild process, controllable structure, and low cost, providing a general preparation strategy for high-efficiency non-precious metal water electrolysis catalysts.

The invention relates to the technical field of aldehyde oxidation, and discloses a multi-metal oxygen cluster as well as a preparation method and application thereof. The structural general formula of the multi-metal oxygen cluster is [X] 3 [M1M26O18 (OH) 6], and M1 is one of VIII subgroup elements; m2 is chromium, molybdenum or tungsten; and X is an organic positive ion. According to the present invention, the polyoxometalate comprises two combined metal elements and an organic structure, such that the high-carbon aldehyde is efficiently oxidized into the high-carbon acid, the reaction efficiency of the high-carbon aldehyde oxidation to prepare the high-carbon acid is improved, the generation of the by-product is substantially reduced, and the conversion rate and the selectivity of the high-carbon aldehyde are improved.

The invention relates to a preparation method and application of 3D hydrogel constructed by a semiconductor-heteropolyblue superstructure assembled by polyoxometallate, the preparation method comprises the following steps: dissolving polyoxometallate and metal chloride in a mixed solvent system of oleic acid, oleylamine and ethanol, uniformly stirring, transferring to a stainless steel high-pressure reaction kettle, and reacting under sealing; after cooling to room temperature, centrifuging and collecting a solid product; washing and drying overnight to obtain a metal oxide-heteropolyblue-superlattice; the preparation method comprises the following steps: dispersing metal oxide-heteropolyblue-superlattice in a mixed system of a polyvinyl alcohol aqueous solution and glutaraldehyde, carrying out water bath ultrasonic full mixing, adding a hydrochloric acid solution, carrying out ultrasonic full mixing and gelation reaction at room temperature again, carrying out freeze-drying soaking treatment on the obtained gel twice, and carrying out freeze drying to obtain the metal oxide-heteropolyblue-superlattice hydrogel. The three-dimensional metal oxide-heteropolyblue-superlattice hydrogel is obtained. The material realizes efficient solar steam generation through the advantages of improving the photothermal conversion performance, optimizing the water evaporation process and reducing the energy transfer loss.

The present application relates to the field of flame retardant, especially to a kind of phenyl alkali metal silsesquioxane coated polyoxometalate submicron sphere, composite material and application, the present application uses polyoxometalate, phenyl alkali metal silsesquioxane, reaction solvent as raw material, with phenyl alkali metal silsesquioxane as core, using the strong electronegativity of polyoxometalate, surface coating is prepared by strong electrostatic effect submicron sphere.Then the submicron sphere is compounded with EP, and EP / POM(Mo)@POSS(Li) composite material is obtained.The composite material prepared by the present application contains phenyl alkali metal silsesquioxane with smoke suppression carbonization effect, and polyoxometalate with promoting matrix catalytic carbonization, which can greatly reduce the release of heat, smoke and toxic gas of EP composite material in the combustion process, thereby providing protection for the life safety of personnel in fire scene.

This invention discloses a method for synthesizing an adsorbent for the rapid removal of methylene blue from water using waste plastics as raw materials, belonging to the field of pollutant treatment technology. The method for synthesizing the methylene blue adsorbent using PET as raw material includes the following steps: mixing PET material, sodium chloride, and zinc chloride, carbonizing to obtain a PET-based carbon material, mixing with a polyoxometalate solution, and reacting to obtain the methylene blue adsorbent. The adsorbent synthesized by this invention has advantages such as high removal rate and short adsorption equilibrium time. It facilitates the resource utilization of PET material while overcoming the shortcomings of existing adsorbents, such as low removal rate and long adsorption equilibrium time. This invention converts PET material into an adsorbent through carbonization, not only promoting the upgrading and recycling of PET materials but also providing another possibility for methylene blue adsorption.

The invention relates to the technical field of inorganic pigment preparation, in particular to a high-performance bismuth vanadate pigment coated with multi-metal oxide in situ and a preparation method of the high-performance bismuth vanadate pigment. The preparation method comprises the following steps: preparing a precursor: respectively preparing a bismuth-containing solution A and a vanadium-containing solution B with the concentration of 0.1-2.0 mol / L; preparing a coating agent solution, namely preparing the coating agent solution with the total concentration of 0.5-2.0 mol / L; in-situ deposition coating: mixing and reacting the bismuth-containing solution A and the vanadium-containing solution B to obtain a mixed solution C, adding the coating agent solution, controlling the total metal ion content of the coating solution to be 5-20% of the total content of vanadium and bismuth, adjusting the pH value to be 5-8, and reacting to obtain a bismuth vanadate precursor; and post-processing. The metal oxide layer is coated in situ in the BiVO4 preparation process, the composition and the structure of the coating layer are accurately regulated and controlled, and the acid and alkali resistance, the weather resistance and the like of the pigment are remarkably improved while the excellent color performance of the pigment is guaranteed.

The application discloses a polyoxometalate composite solid electrolyte membrane and a preparation method thereof and a solid-state battery, and belongs to the technical field of solid-state lithium metal batteries. The polyoxometalate composite solid electrolyte membrane comprises a polyionic liquid and lithium silicotungstate; the polyionic liquid is composed of polydiallyl dimethyl ammonium cations and lithium salt anions; and the mass ratio of the lithium silicotungstate to the polyionic liquid is (4-25):(75-96). The application utilizes strong electrostatic coupling between polyoxometalate anions and polymer cation chains to construct an ion transmission network with ordered structure. The composite structure effectively promotes lithium salt dissociation and lithium ion directional migration, significantly improves the room temperature ionic conductivity, lithium ion transference number and mechanical strength of the electrolyte membrane, and simultaneously enhances the interface compatibility and electrochemical stability of the electrolyte membrane with a lithium metal negative electrode.