46 results about "Nano catalyst" patented technology

The application discloses a method for preparing noble metal nanocrystals by a low-VOC polyol method, and belongs to the technical field of nanometer catalyst preparation. The method uses high-boiling polyol with a normal pressure boiling point not lower than 200 DEG C as a solvent and a reducing agent, adjusts the pH value of reaction slurry to 9-13 in a composite additive system containing a surface protecting agent and a pH regulator, and then carries out a reduction reaction at 160-200 DEG C through ultrasonic dispersion and programmed temperature rising to prepare supported noble metal nanocrystals. The application solves the VOC emission problem of the traditional method from the source by using high-boiling polyol. Meanwhile, the accurate control of nanocrystal size is realized through the synergistic effect of pH regulation and programmed temperature rising. The prepared catalyst has the advantages of uniform particle size, high dispersity and excellent catalytic performance. The method is stable in process, low in cost, green and environment-friendly, and suitable for large-scale production.

The application discloses a P and O co-doped FeNiRuOx nano catalyst and a preparation method and application thereof, relates to the technical field of electrocatalytic materials, and the catalyst takes Fe, Ni and Ru as metal active centers, reconstructs a surface electronic structure through P and O double anion co-doping, and forms a polygonal nano structure, wherein the mass fraction ranges of Fe, Ni, Ru and P are 5.0-6.0%, 75-78%, 11-12% and 6.5-7.0% respectively. The preparation method comprises the following steps: taking iron acetylacetone, nickel acetylacetone and ruthenium chloride trihydrate as metal sources, synthesizing a precursor through a solvothermal reaction, and realizing P and O co-doping through a sodium hypophosphite assisted solid-phase phosphorization process, and the preparation process is mild. The synthesized catalyst has unique structural advantages, the formed polygonal nano structure has a large specific surface area and rich grain boundary defects, more active sites are exposed, and convenient channels are provided for the mass transfer of reactants and products. The synergistic effect among the polymetals further enhances the catalytic performance.

This invention discloses a magnetic Ni x％ This paper describes the preparation method and application of FeNb2O6 composite catalysts, which fall under the technical field of supported bimetallic oxide catalysts. First, magnetic FeNb2O6 nanocatalysts are prepared via a one-pot hydrothermal method using niobium oxalate hydrate as the niobium source and ferric nitrate as the iron source. Then, magnetic Ni is prepared via a modified deposition precipitation method using nickel nitrate as the nickel source and the magnetic FeNb2O6 nanocatalyst as the support. x％ @FeNb2O6 composite catalyst. The beneficial effect of this invention is that Ni... x％ In the FeNb2O6 composite catalyst, iron, niobium, and nickel species are highly dispersed with no obvious agglomeration, exhibiting high activity and high stability. Furthermore, the catalyst's magnetic properties allow for recovery and reuse, overcoming the shortcomings of traditional metal catalysts such as easy loss and difficulty in recovery after reaction. This Ni... x％ The FeNb2O6 composite catalyst is used for the catalytic hydrogenation conversion of Caragana korshinskii and its related model compounds. Due to its high C-O- bond cleavage activity, it can more effectively promote the depolymerization of Caragana korshinskii organic matter, thereby obtaining bio-oil rich in high-value COH functional groups.

The application discloses an X2H2 nano-catalyst rich in oxygen vacancies and a preparation method and application thereof in electrocatalytic reduction of carbon dioxide. The preparation method comprises the following steps: firstly, adding monohydrate citric acid into a solution containing copper salt and cerium salt, evaporating and concentrating the solution to form a sol, and then drying the gel to obtain a gel which is placed in a tube furnace for annealing, so as to obtain the X2H2 nano-catalyst rich in oxygen vacancies. The catalyst can be applied to electrocatalytic reduction of carbon dioxide to generate high-carbon products. The application has the characteristics of simple preparation operation, low cost and excellent performance (the selectivity is as high as 100%) in electrochemical reduction of carbon dioxide to ethylene and ethanol.

The application belongs to the field of catalytic new materials and fine chemical technology, and discloses a preparation method and application of a supported noble metal aluminide nanocatalyst. The application provides a new preparation method and catalyst, and can synthesize a supported noble metal aluminide catalytic material with high activity and high selectivity at a lower temperature, which is used for selective hydrogenation reaction. In particular, the application aims to solve the problems of difficult preparation, easy phase mixing, and insufficient selectivity and stability in hydrogenation reaction of the high-activity supported noble metal aluminide nanocatalyst, thereby significantly improving the catalytic effect. The supported noble metal aluminide nanocatalyst prepared by the application can obtain the performance even better than that of a conventional noble metal catalyst at a lower reaction temperature and pressure, the reaction path is clear, the metal ratio range is adjustable, the synthesis result has high repeatability, and the application provides a new high-efficiency and stable catalytic material for selective hydrogenation.

This application relates to the field of catalyst technology, disclosing an electron-rich Pd nanocatalyst, its preparation method, and its application. The electron-rich Pd nanocatalyst comprises a sheet-like Mg(OH)₂ support and Pd nanoparticles uniformly loaded on the sheet-like Mg(OH)₂ support; wherein the thickness of the Mg(OH)₂ sheet is less than 2 nm; and the average particle size of the Pd nanoparticles is less than 4 nm. The preparation method includes dispersing the Mg(OH)₂ support in water, sequentially adding a palladium source and urea, refluxing at 55-65°C to obtain a precursor solution; adding a reducing agent to the precursor solution to carry out the reaction, collecting the solid deposit, washing, and drying to obtain the final product. This application, by regulating the electronic structure of the Pd nanoparticles, significantly increases the electron density on their surface, increasing the repulsion of reaction products, weakening the adsorption of reaction products on the catalyst surface, avoiding poisoning of the catalyst active sites, and improving the reactivity and selectivity of the Pd nanocatalyst for the hydrogenation of nitrile compounds at low temperatures.

The application belongs to the technical field of catalysts and their applications, and relates to a metal-based composite nanocatalyst, a preparation method and application thereof. The metal-based composite nanocatalyst is obtained by forming an amorphous layer on the surface of Au / rare earth manganate and constructing a metal-support strong interaction through a NaBH4 aqueous solution reduction method at room temperature. The metal-based composite nanocatalyst constructed by the application has excellent catalytic oxidation activity and realizes high conversion rate of CO at room temperature.

This invention relates to the field of electrocatalyst technology, and in particular to a chiral CoFe-based oxygen evolution electrocatalyst, its preparation method, and its application. Iron salts, cobalt salts, and chiral tartaric acid are dissolved together in N,N-dimethylformamide solvent to form a homogeneous mixed solution. Hydrazine hydrate is added to the mixed solution and thoroughly mixed. The solution is then transferred to a high-pressure reactor and subjected to a solvothermal reaction at a set temperature to obtain a nanocatalyst precursor. The nanocatalyst precursor is then subjected to centrifugation, washing, drying, and vacuum calcination to obtain the product. This method successfully prepares a chiral CoFe-based nanocatalyst through the inductive effect of chiral tartaric acid, combined with a specific solvothermal reaction and subsequent heat treatment process. This chiral CoFe-based electrocatalyst exhibits significantly enhanced catalytic activity and stability in the oxygen evolution electrocatalytic reaction, demonstrating superior electrochemical performance compared to achiral catalysts.

This utility model discloses a heterogeneous catalytic wet oxidation device suitable for coking wastewater treatment, belonging to the field of wastewater treatment. The device mainly includes an equalization tank (1), a dosing device (2), a sedimentation tank (3), a high-pressure pump (4), a wastewater tubular heat exchanger (5), a reaction tower (6), a gas tubular heat exchanger (7), an air compressor (8), a condenser (9), a gas-liquid separator (10), a tail gas treatment device (11), a spray system (12), a nano-catalyst partition (13), and a micro-nano aeration device (14). The high-temperature flue gas from the coking plant is used to heat the air (or other oxygen-containing gas) to achieve waste heat utilization. The nano-catalyst partition utilizes carbon fibers to support nano-catalysts. Micro-nano aeration systems are respectively provided at the bottom and middle of the reaction tower. The oxygen mass transfer efficiency is improved through a graded cross-flow method, which enhances the decomposition of pollutants in the wastewater and effectively improves the pollutant removal efficiency in the wastewater.

This invention provides a Rh / MnO nanocatalyst, its preparation method, and its application, comprising the following steps: A) adding a manganese source solution dropwise to a ligand solution to obtain a mixed solution; the ligand solution includes a complexing agent and a polyol; B) drying and calcining the mixed solution to obtain manganese oxide; C) mixing the manganese oxide and a rhodium source in water to obtain a mixed slurry; the mass ratio of the manganese oxide to the rhodium source is (75~150):(1~10); D) drying and calcining the mixed slurry to obtain a precursor; E) reducing the precursor in a reducing atmosphere to obtain the Rh / MnO nanocatalyst. The nanocatalyst of this invention exhibits high conversion rate and high selectivity in the direct synthesis of multi-carbon oxygen-containing compounds from syngas. The multi-carbon oxygen-containing compounds produced by the Rh / MnO catalyst provided by this invention contain a high proportion of ethanol and acetaldehyde, achieving the co-production of ethanol and acetaldehyde.

The present application belongs to the technical field of waterproofing and leakage stopping of underground engineering, and particularly relates to a tunnel existing crack self-adaptive leakage stopping material and a preparation method and application thereof. The tunnel existing crack self-adaptive leakage stopping material comprises component A and component B, the mass ratio of the component A to the component B is (5-8):1, the component A comprises modified epoxy emulsion 30-40 parts, functional monomer 15-25 parts, nano composite filler 8-15 parts, expansion accelerator 5-10 parts, dispersing agent 1-3 parts and deionized water 10-20 parts in terms of mass fraction, and the component B comprises latent curing agent 40-60 parts, nano catalyst 5-10 parts, slow-release carrier 20-30 parts and defoaming agent 1-2 parts in terms of mass fraction. The present application solves the technical problems that the conventional leakage stopping material is difficult to penetrate into fine cracks, is easily washed away under high-pressure water flow and has insufficient bonding strength with crack wall surface, and realizes adaptive plugging and long-acting water stopping effect for cracks with different widths and different water contents.

The application discloses a kind of based on cobalt-nitrogen pre-coordination carbon precursor derived polyatomic heteroatom doped Co / Pt nano catalyst and its preparation method and application, belong to fuel cell catalyst and its preparation technical field.The application solves the problem of expensive anode catalyst Pt / C of existing PEMFCs.The application is based on cobalt-nitrogen pre-coordination carbon precursor, solvent assisted metal-organic framework self-assembly technology is used, with methanol as solvent medium, by doping S or Br, the dispersibility of material and its morphology feature are improved, metal-organic framework precursor is obtained, further using the method that physical suction filter and high-temperature heat treatment are combined, make the uniform loading of platinum particles in MOF derived material, based on cobalt-nitrogen pre-coordination carbon precursor derived polyatomic heteroatom doped Co / Pt nano catalyst is obtained.The catalyst improves noble metal atom utilization rate under the premise of guaranteeing excellent activity, realizes the purpose of reducing the amount of noble metal.

The application discloses a superfine cobalt phosphide nanocluster / carbon composite catalyst, a supported catalyst and a preparation method and application thereof, and belongs to the field of liquid hydrogen storage and nanometer catalyst preparation. A mild low-temperature 300-400 DEG C in-situ heat treatment strategy is adopted, so that the growth and agglomeration of metal nanometer particles under high temperature are avoided. The average size of the prepared superfine cobalt phosphide nanocluster can reach 4.40+ / -1.3 nm, the extremely small size provides a larger electrochemical active specific surface area, and catalytic active sites are fully exposed. Under the condition of 30 DEG C, the catalyst shows super-high catalytic activity for ammonia borane hydrolysis, and the conversion efficiency TOF is as high as 1188 h ‑1 , and the performance is far higher than that of most reported non-noble metal catalysts.

Provided herein are vesicular nanocatalysts decorated on their surface with enzymes, such as for industrial use. More particularly, the nanocatalysts include outer membrane vesicles (OMVs) presenting on their surface carbonic anhydrase or a functional fragment or derivative thereof. Uses, methods of manufacture, and compositions of the nanocatalysts are also disclosed herein.

This invention relates to a catalyst, specifically a sub-10 nm catalyst and its self-assembly preparation method and application, comprising the following steps: pretreating DNA-modified Fe3O4 particles to remove free DNA strands; mixing scaffold DNA, short-chain DNA, and extended-chain DNA in a buffer solution and annealing to self-assemble into a DNA template; mixing the DNA-modified Fe3O4 particles and the DNA template in an incubation solution for co-incubation to obtain the catalyst. Compared with the prior art, this invention solves the problem of the difficulty in achieving precise quantity, accurate position, and consistent spacing of catalysts for CVD growth of CNTs with diameters less than 10 nm in the prior art. This method is based on the programmable characteristics of DNA origami, which allows for precise positioning of Fe3O4 nanoparticles, effectively controlling the spacing, arrangement, and concentration of the catalyst on the substrate, thereby achieving precise control of CVD growth of CNTs using this catalyst.

The application discloses a core-shell structure nanometer catalyst, a preparation method and application, wherein the preparation method comprises the following steps: step one, dispersing a carbon carrier in a solution, adding a metal chelating agent, and then adding a non-noble metal precursor to load the non-noble metal precursor on the carbon carrier; step two, after removing the solvent from the solution obtained in step one, performing a first heat reduction to obtain a carbon carrier loaded with a non-noble metal inner core; step three, dispersing the carbon carrier loaded with the non-noble metal inner core in a solution, and adding a platinum precursor; and step four, after removing the solvent from the solution obtained in step three, performing a second heat reduction to obtain a core-shell structure nanometer catalyst with a platinum shell. The core-shell structure nanometer catalyst provided by the application has excellent electrocatalytic oxygen reduction activity and stability.

The application discloses a kind of defective type UiO-66 (Zr) nanometer catalyst and its preparation method and application, it is related to biomass catalytic conversion and metal organic framework material technical field, specifically includes: zirconium chloride, terephthalic acid and acid adjusting agent are added in N,N-dimethylformamide, solvent thermal reaction is carried out under the condition of 120-160 ℃ 3-5h, after centrifugation, washing and drying, defective precursor material is obtained;Defective precursor material is dispersed in organic solution and reflux elution is carried out, after centrifugation, washing and drying, defective type UiO-66 (Zr) nanometer catalyst is obtained.The application solves the problem that the material of UiO-66 (Zr) prepared by traditional method is poor in acid-base site synergy in furfural transfer hydrogenation reaction, low in catalytic efficiency and difficult to realize gram preparation, realizes 100% furfural conversion rate and 99.5% furfuryl alcohol selectivity.

The application provides a gradient-pore activated carbon for adsorbing formaldehyde-benzene series and a preparation method thereof, and belongs to the technical field of activated carbon. In the application, a chitosan-tannic acid network is constructed on a sawdust skeleton, a nano MnOx catalyst is synthesized in situ, and sulfonated pitch is compounded. Then, the gradient pores are constructed through multi-stage heat treatment of nitrogen pre-carbonization, carbon dioxide activation for micropores, and water vapor expansion for mesopores. There are double synergistic mechanisms in the system. One is that the nitrogen-doped sites converted from chitosan and MnOx are synergistic, and formaldehyde is continuously removed through adsorption-catalytic oxidation circulation. The other is that functional partition is realized, the nitrogen-doped / MnOx system is specialized in formaldehyde, and the graphite-like micro area converted from the sulfonated pitch and micropores are synergistically adsorbed with benzene series through pi-pi stacking and confinement effect. This design integrates various functional sites in a single material, and realizes efficient hierarchical adsorption of composite pollutants.

The application belongs to the technical field of electrocatalytic energy, and particularly discloses a bismuth-doped copper-based nanocatalyst and a preparation method and application thereof, wherein the preparation method comprises the following steps: taking copper nitrate trihydrate and bismuth nitrate according to the metal molar ratio of copper to bismuth, and then adding them into a sodium citrate aqueous solution, stirring until completely dissolved to prepare a solution A; taking sodium borohydride and dissolving it in ice deionized water to prepare a solution B; adding the solution B into the solution A, stirring and reacting, and then standing, removing the supernatant, and retaining the precipitate; dispersing the precipitate in deionized water, and then centrifugally separating, repeating the operation for multiple times to wash the residual ions on the surface, and drying the obtained precipitate to obtain the Cu-Bi nanocatalyst. The application adopts a transient co-reduction strategy, has the advantages of simple synthesis process and batch preparation compared with the existing copper-based catalyst synthesis technology, and realizes the construction of the non-equilibrium defect engineering of the bismuth-doped copper-based catalyst at normal temperature.

The application relates to the field of catalysts, and particularly discloses an intelligent design and prediction method for a crystalline porous benzene selective hydrogenation basic zinc carbonate and zinc oxide co-modified nano catalyst, a preparation method of which adopts a mixed solution prepared by mixing and polyethylene glycol as a precipitant for rapid precipitation, and then high-pressure reduction, organic solvent washing, alkali washing and water washing steps are cooperated to prepare a porous catalyst with high specific surface area and uniform dispersion of active components. On this basis, an intelligent design and performance prediction system based on deep learning is further integrated, a convolutional neural network is used to analyze the microstructure of the catalyst, a multi-modal deep neural network is used to predict the performance of the catalyst, and an optimization algorithm is used to recommend optimal process parameters. The porous structure is constructed by co-modification of basic zinc carbonate and zinc oxide, and the intelligent system is combined to realize efficient research and development and accurate performance prediction of the catalyst.

This invention belongs to the field of energy catalysis technology and provides a black phosphorus-ferric tetraphosphide composite nanocatalyst, which is a nano-binary composite structure formed by pebble-shaped ferric tetraphosphide nanocrystals encapsulated by black phosphorus crystals. This invention uses a one-step ball milling synthesis process, under appropriate process conditions, to directly convert red phosphorus powder and iron powder into nanoparticles with a black phosphorus-ferric tetraphosphide composite composition. After simple washing and dispersion, the active sites distributed on the surface are further exposed. Characterization tests revealed a large number of nanoscale black phosphorus-ferric tetraphosphide two-phase structures in the catalyst. Electrocatalytic experiments verified that this novel material exhibits excellent activity in the electrocatalytic synthesis of ammonia.

This invention discloses a nanocatalyst for the synthesis of dimethyl carbonate, its preparation method, and its application, belonging to the field of catalyst technology. The invention involves a Friedel-Crafts reaction of biphenyl dichlorobenzyl with an alkylating agent to obtain a highly cross-linked nanoparticle support; a nucleophilic substitution reaction of this support with imidazole chloride to obtain an imidazole-modified highly cross-linked nanoparticle support; and an ion exchange reaction in an alkaline solution to obtain a highly cross-linked nanoparticle catalyst. The preparation method of this invention uses mild reaction conditions, requiring no high pressure or high temperature, making it suitable for industrial production. The obtained nanocatalyst does not contain toxic components; it can catalyze the synthesis of dimethyl carbonate under mild conditions, achieving a dimethyl carbonate yield of 96% and a selectivity of 99%; it exhibits excellent cycling performance, achieving a yield of 93% and a selectivity of 99% after 10 cycles, thus solving the problems of existing catalysts containing toxic components, poor catalyst cycling performance, and the need for high temperature and high pressure reactions.

The application provides an in-situ cracking and modification method for preparing nanometer catalysts in a well, which comprises the following steps: sending a nanometer catalyst precursor into a gas burner while the gas burner is heating a stratum; under the high-temperature condition generated by the gas burner, using the principle of generating nanometer crystals by a gas phase method to make the nanometer catalyst precursor react to generate nanometer catalysts which can promote the conversion of organic matter in shale and low-mature shale into light oil; and under the driving of tail gas generated by the gas burner, the generated nanometer catalysts are carried into the oil shale layer together with the tail gas to catalyze the conversion of the organic matter. The preparation method belongs to a heating method which can save energy, improve the energy utilization rate of low-mature shale oil and oil shale, and reduce the cost. The catalyst particles prepared by the gas phase method are small, the in-situ synthesis has good carrying property, and the use of water in the traditional fracturing fluid carrying process is avoided.

The application provides a method for preparing a bio-glass loaded nanocatalyst through ion exchange and application. The method has the following advantages: first, it has wide applicability and can introduce one or more active metals (such as Ni, Co, Fe, Cu, Pt, Pd, Ru, Ag, etc.) through ion exchange; second, it can realize the introduction of a high content of active metals, and the loading amount can reach about 20%. The Ni particle size in the prepared new Ni-based catalyst is small (about 2.7 nm), the dispersion is high, and the activity and stability are excellent. In the process of hydrogenation reaction of phthalate to generate cyclohexane-1,2-dicarboxylate, the conversion rate of dioctyl phthalate is as high as 99%, and the selectivity of dioctyl cyclohexane-1,2-dicarboxylate is also 99%. The catalyst shows stability in continuous use, and its performance remains unchanged after eight times of catalysis, showing excellent recycling performance. After the catalyst is deactivated, it can be regenerated by simple treatment and continue to be recycled. The preparation method of the application is simple, low in cost, good in repeatability, can be recycled and used for multiple times, and has a wide industrial application prospect.

This invention discloses a method for preparing styrax acetate using a metal-oxygen cluster nanocatalyst. The method involves first placing a metal-oxygen cluster nanocatalyst (with the molecular formula MaObX, where M can be any one of V, Cr, Nb, Mo, Ta, or W, a can be any integer between 1 and 20, b can be any integer between 6 and 70, and X can be any one of Mn, Fe, Co, Ni, Cu, or Zn) into a reactor. Then, α-phenylethanol and acetic acid are added to the reactor, and the reaction is carried out under specific temperature conditions. After separation and purification, styrax acetate is obtained. This method utilizes a metal-oxygen cluster nanocatalyst to catalyze the reaction of α-phenylethanol and acetic acid to prepare styrax acetate. This catalyst exhibits excellent catalytic activity and chemical stability, resulting in a high reaction yield. Even after multiple cycles, the catalytic efficiency does not decrease, saving production costs. Furthermore, the reaction does not generate additional waste acid or wastewater, making it environmentally friendly.