434 results about "Nano catalyst" patented technology

The invention discloses a modified graphite felt electrode for an all-vanadium redox flow battery and a preparation method of the modified graphite felt electrode, and belongs to the technical field of redox flow battery electrode materials. The preparation method comprises the following steps: graphite felt electrochemical oxidation etching treatment; self-assembling a conductive layer on the oxidized and etched graphite felt to obtain the graphite felt attached with the conductive layer; and loading a metal and nitrogen-doped carbon (M and NC) nano catalyst layer on the graphite felt attached with the conductive layer to obtain the modified graphite felt electrode. Various properties of the graphite felt are comprehensively improved through matrix treatment, structure change and load catalysis, mild electrochemical oxidation etching is adopted, a carbon fiber structure is protected, a self-assembled net-shaped conductive layer forms a stable conductive channel, the specific surface area is remarkably increased, a nitrogen-doped carbon shell is adopted to wrap metal nanodots to form an M-NC catalytic layer, and the specific surface area is remarkably increased. The catalyst layer is not easy to dissolve out, the capacity fading rate is obviously improved, the loading capacity of the catalyst layer on the reticular structure conducting layer with a larger specific surface area is larger, and meanwhile, the process is simple and low in cost.

The present invention relates to magnetic, catalytically active, and radiosensitizing nanoparticles (NanoXcats) and the method for their production. A method is disclosed for the production of functionalized greigite nanoparticles with a narrowband size distribution (10-30 nm) for use in multimodal cancer therapy. NanoXcats are superparamagnetic Fe3S4 nanoparticles whose surfaces are equipped with polar functional groups. The surface structures of NanoXcats are suitable for conjugation with, or for covalent or electrostatic binding of, active substances, which may be cancer drugs, cell growth inhibitors, or NO donors. Due to the EPR effect, NanoXcats are preferentially internalized by tumor cells. The targeted accumulation of NanoXcats in tumor tissue is achieved by an external inhomogeneous magnetic field. NanoXcats exhibit enhanced catalytic activity in tumor cells.The catalytic activity of intracellular NanoXcats can be triggered, controlled, and enhanced by low-dose X-rays. Surface-bound drugs are additionally activated in tumor cells by the catalytic activity of NanoXcats. NanoXcats act as superoxide dismutase, nitric oxide synthase, and Fenton catalyst. They catalyze, for example, reactions of the superoxide anion radical to hydrogen peroxide, of L-arginine to NO, and of hydrogen peroxide to the hydroxyl radical.

The invention discloses a preparation method and application of a mesoporous confinement nickel-based methane dry reforming catalyst, and belongs to the field of nano-catalyst preparation.According to the method, on the basis of a traditional impregnation method, a small amount of ethylene glycol is added to serve as a surface active agent, high-temperature-resistant SBA-15 with ordered mesoporous channels serves as a carrier, metal nitrate serves as a precursor, and the mesoporous confinement nickel-based methane dry reforming catalyst is prepared through a hydrothermal method; in the high-speed stirring evaporation process, along with evaporation of water, the surface tension of the mixed liquid is gradually reduced, and meanwhile, the viscosity of the solution is increased, so that the metal nitrate precursor can be conveyed into an SBA-15 pore channel and is anchored in the pore channel under the action of high viscosity. And the methane dry reforming catalyst with high activity and high stability is obtained through drying, calcining and hydrogen reduction. The catalyst has the advantages of simple preparation process, low cost, high catalytic efficiency, high stability and the like.

The invention relates to the technical field of electrochemical sensors, and provides a multi-channel electrochemical detection electrode, an electrochemical sensor and a detection method.The multi-channel electrochemical detection electrode comprises an electrode substrate and a plurality of working electrodes arranged on the electrode substrate; the surfaces of the plurality of working electrodes are respectively modified with different types of metal nano-catalysts to detect different gas components, and the surfaces of the working electrodes are covered with PDMS hydrophobic layers to form a hydrophilic / hydrophobic channel separation structure. The surfaces of a plurality of working electrodes are modified with different types of metal nano-catalysts and covered with PDMS hydrophobic layers to form a hydrophilic / hydrophobic channel separation structure, and the multi-channel electrochemical detection electrode separates gas molecules through hydrophilic / hydrophobic channels, so that the cross reaction can be inhibited, and the cross sensitivity can be reduced.

The invention discloses a high-porosity organic salt framework confinement nano-metal hydrogen storage material and a preparation method thereof, and belongs to the field of new energy materials. The material takes a carboxylic acid organic salt framework (POS-1) as a carrier, the specific surface area of the material is 1520 m < 2 > / g, the pore size distribution is 1.8-2.5 nm, nano Mg / Ni particles (the average particle size is 3.2 + / -0.5 nm) are confined in pores through a gradient loading and in-situ reduction technology, and an atomic layer deposition (ALD) is adopted to modify a Pd nano catalyst (the loading capacity is 0.48 wt%). The reversible hydrogen storage capacity of the material at room temperature reaches 5.8 wt%, the hydrogen desorption temperature is lower than 80 DEG C, and the capacity retention ratio is larger than or equal to 92% after 100 times of circulation. The preparation method comprises the steps of organic salt framework synthesis, metal precursor gradient loading, low-temperature reduction (250 DEG C), hydrogenation activation and the like, the process is simple and controllable, and the catalyst is suitable for scenes such as a vehicle-mounted hydrogen storage system.

The invention discloses a method for preparing furfuryl amine by reductive amination of biomass-based furfural, which comprises the following steps: adding furfural, a catalyst, ammonia water and a solvent into a closed reaction kettle in proportion, replacing air in the reaction kettle with high-purity hydrogen, and reacting in an oil bath pan for a period of time to obtain a target product furfuryl amine, the nano-catalyst provided by the invention is a nitrogen-doped porous hollow carbon sphere loaded nano bimetallic catalyst, takes noble metal and non-noble metal as a metal active center together, and has adjustability of macroscopic size and microstructure at the same time; the method has the advantages of simple reaction system, mild conditions, no pollution to the environment, high efficiency, energy conservation, low cost, few byproducts, high yield, high selectivity and the like, the furfural is efficiently converted into furfuryl amine at low temperature and low pressure within a short time, the used heterogeneous catalyst is stable and easy to recover, a new thought and direction are provided for enterprise production and scientific research, and the method is suitable for industrial production. The method has great significance on development and utilization of biomass-based furfural.

The invention relates to the technical field of coatings, and particularly discloses a high-wear-resistance and high-toughness polyurethane floor coating and a preparation method thereof. According to the technical key points, the high-wear-resistance and high-toughness polyurethane floor coating is prepared from the following components in parts by weight: 100 parts of cross-linked polyurethane matrix resin, 1 to 3 parts of nano ZnO (at) MCM-41 catalyst, 10 to 15 parts of core-shell microsphere powder filler, 5 to 10 parts of fiber filler, 15 to 20 parts of reactive diluent and 1 to 3 parts of photoinitiator, the cross-linked polyurethane matrix resin is composed of a disulfide bond-containing polyurethane prepolymer and an ultraviolet curing acrylate end group; the core-shell microsphere powder filler is prepared by taking a polyurethane-acrylate copolymer as a shell layer and diamond and silicon carbide composite particles as a core layer, and the particle size of the core-shell microsphere powder filler is 200-500nm. The polyurethane floor coating prepared in the invention has excellent performance, and the coating has high wear resistance and high toughness.

The invention provides an efficient chloramphenicol degradation method based on Co-Cu-carbon composite nano-catalyst activated peroxymonosulfate, which comprises the following steps: regulating the Co / Cu molar ratio in a bimetal organic framework precursor, and performing pyrolysis to prepare the Co-Cu-carbon composite catalyst with an optimized pore structure, graphitization degree and metal dispersity; peroxymonosulfate is activated by utilizing the synergistic effect of Co / Co and Cu / Cu redox pairs to generate sulfate free radicals, hydroxyl free radicals, singlet oxygen and superoxide free radicals, and direct oxidative degradation of chloramphenicol is promoted by taking a catalyst as an electron transfer bridge; the method realizes rapid and efficient removal of chloramphenicol, high mineralization rate, excellent cycle stability and strong anti-interference capability, and solves the technical problems of low removal efficiency, high cost and easy secondary pollution in the prior art.

The invention discloses a method and a device for preparing a single-walled carbon nanotube based on the host-guest interaction of pillararene and metallocene. The method comprises the following steps: enabling a host compound and a guest compound to form a host-guest complex; the host compound comprises pillararene or a derivative thereof, and the guest compound comprises a cyclopentadienyl metal complex or a derivative thereof; the method comprises the following steps: reacting a mixed reaction system containing a host-guest compound and a polymerization inhibitor at a high temperature to obtain nano-scale catalyst particles; and contacting the nano-catalyst particles with a carbon source, and decomposing and growing the carbon source on the surfaces of the nano-catalyst particles to prepare the single-walled carbon nanotubes. The method disclosed by the invention is mainly based on the strong inclusion behavior of the host compound and the guest compound, and by utilizing the compatibility of the host compound, the solubility of the metallocene in an organic solvent is effectively improved, the decomposition time of the metallocene at high temperature is prolonged, and the in-situ controllable preparation of nano-scale catalyst particles is achieved; and furthermore, the yield and the quality of the single-walled carbon nanotubes are improved.

The invention discloses a preparation method and application of a CuO / MgO nano-catalyst, and relates to a preparation method and application of a nano-catalyst. The invention aims to solve the problem that in the existing electrocatalytic CO2 reduction technology, under high current density, an oxide catalyst is easy to generate various reduction products, and high C2H4 selectivity is difficult to achieve. The method comprises the following steps: 1, preparing a precursor solution; 2, hydrothermal reaction; and 3, roasting. According to the application, the CuO / MgO nano-catalyst is used as a raw material for preparing a gas diffusion electrode and is used for electrocatalytic CO2 reduction. The preparation method is used for preparation and application of the CuO / MgO nano-catalyst.

Six-membered high-entropy foam for hydrogen production by water splitting and preparation method are provided. The foam consists of Ni, Fe, Cu, Co, Mo, and Pt, comprising 10 at %-25 at % of Ni, 10 at %-25 at % of Fe, 10 at %-25 at % of Cu, 10 at %-25 at % of Co, 10 at %-25 at % of Mo, and 10 at %-25 at % of Pt. Catalyst loading of the foam can reach a range of 0.8 mg / cm2-3.2 mg / cm2, which is much higher than the effective catalyst loading of most nano-catalysts. When used as catalyst for hydrogen production by water splitting, the hydrogen evolution overpotential of the surface of the six-membered high-entropy foam is within a range of 36 mV-60 mV, and the foam operates stably at industrial-level current density (500 mA / cm2). The preparation method does not require harsh environment such as high temperature or high vacuum, making the method simple and easy to implement, with low-cost raw materials.

The invention discloses a residual oil derived carbon supported Pt-Co-Au intermetallic compound as well as a preparation method and application thereof. According to the preparation method, residual oil is used as a carbon source, nitrogen-doped petroleum vacuum residual oil porous carbon is synthesized through a template method and nitrogen doping modification, and the high-dispersion intermetallic compound composite material Pt-Co-Au / NPPC is prepared with the porous carbon material as a carrier through an impregnation reduction method. In the catalyst, the total metal loading capacity is 30 to 50 percent by weight, the Pt loading capacity is 26 to 41 percent by weight, the Co loading capacity is 3.8 to 7 percent by weight, and the Au loading capacity is 0.2 to 2 percent by weight. The residual oil derived carbon supported Pt-Co-Au composite material nano catalyst prepared by the invention has efficient oxygen reduction (ORR) catalytic activity, and the synthesized catalyst has the characteristic of small size. The small size can effectively improve the utilization rate of Pt atoms, and the doping of Au can optimize the electronic structure of surface Pt, so that the ORR activity is improved. The fuel cell membrane electrode test peak power density of the prepared catalyst under the hydrogen-air condition reaches 1.12 W / cm < 2 >, the synthesis steps are simple, and the catalyst has good application prospects.

The invention relates to a porphyrin-based iron metal organic framework (Fe-TCPP) catalyst for improving photoresponsiveness, which is characterized in that the Fe-TCPP nano catalyst is prepared by using an iron source and meso-tetra (4-carboxyphenyl) porphin (TCPP) as precursors through a simple solvothermal method, assisting coordination by virtue of polyvinylpyrrolidone (PVP), performing sealed reaction after ultrasonic dispersion, and preparing the Fe-TCPP nano catalyst. A purple suspension is obtained. And centrifuging, washing and drying to obtain the nano rod-shaped Fe-TCPP metal organic framework material. The Fe-TCPP catalyst prepared by the preparation method disclosed by the invention has a regular crystal structure and good dispersity, and can be stably coordinated to form a Fe-O cluster structure. The effective introduction of the TCPP enhances the charge transfer (LCCT) capability from the ligand to the metal cluster, effectively promotes the Fe (III) / Fe (II) circulation, and improves the photocatalysis-ozonation catalytic efficiency. The catalyst has the advantages of high thermal stability, less metal ion dissolution, good cycle performance and the like, and has wide application potential in the field of water treatment.

The invention discloses a non-noble metal catalyst, a preparation method thereof and application of the non-noble metal catalyst in preparation of acetic acid through methane oxidation, and belongs to the field of direct conversion and utilization of methane. The active metal of the catalyst is transition non-noble metal MnOx, and the carrier is an MFI type molecular sieve (ZSM-5). The catalyst can directly react methane and oxygen at low temperature to prepare acetic acid without adding a co-reducing agent and carbonylation raw materials (such as H2 and CO). The nanometer MnOx catalyst has the advantages of mild reaction conditions, high acetic acid selectivity and the like, the acetic acid selectivity can reach 81.8%, and the nanometer MnOx catalyst shows good recycling stability.

The utility model provides a copper-based nano-catalyst production device and relates to the technical field of copper-based nano-catalysts. The device comprises a supporting seat, a first-stage grinding cylinder, a second-stage grinding cylinder, a third-stage grinding cylinder and a material cylinder which are rotatably arranged above the supporting seat, are in a coaxial state and are sequentially communicated, and three baffles which are respectively arranged between the first-stage grinding cylinder and the second-stage grinding cylinder, between the second-stage grinding cylinder and the third-stage grinding cylinder and between the third-stage grinding cylinder and the material cylinder are arranged on the supporting seat. The two ends of the first-stage, second-stage and third-stage grinding cylinders and the material cylinder are rotationally connected with the corresponding baffles or supporting seats respectively; a first-stage screen is arranged on the baffle between the first-stage grinding cylinder and the second-stage grinding cylinder, a second-stage screen is arranged on the baffle between the second-stage grinding cylinder and the third-stage grinding cylinder, and a third-stage screen is arranged on the baffle between the third-stage grinding cylinder and the material cylinder. According to the utility model, three-stage grinding of materials is realized, the three-stage grinding is carried out in the same equipment, and material transfer is not needed among the multi-stage grinding, so that the grinding efficiency is greatly improved.

The present invention relates to a process for enhancing the photocatalytic degradation of perfluorooctanoic acid by a foam-supported nanocatalyst, which comprises the following steps: the first step is the collection and detection of industrial wastewater containing perfluorooctanoic acid; the second step is the pH adjustment of the industrial wastewater; and the third step is the process for photocatalytically degrading perfluorooctanoic acid. By effectively inhibiting the aggregation of the nanocatalyst during the reaction, the present invention can achieve the effective degradation of perfluorooctanoic acid (the degradation rate is 73.2-99.9%) and the recycling and reuse of the nanocatalyst.

The invention provides a sludge-based composite fuel as well as a preparation method and application thereof. The sludge-based composite fuel is prepared from the following raw materials in percentage: 40-60% of dewatered sludge, 20-40% of biomass powder, 3-8% of a nano catalyst and 2-5% of a composite adhesive. According to the sludge-based composite fuel, sludge, biomass and other fuels are mixed according to a certain proportion, the nano-catalyst is added to improve the combustion performance of the sludge fuel, the composite adhesive enhances the forming strength and waterproofness of the fuel, the component proportion and process conditions are optimized, and the sludge-based composite fuel is prepared. The problems that traditional sludge fuel is low in heat value, poor in combustion stability, high in pollutant emission and insufficient in forming storage performance are solved.

The invention discloses a preparation method of a controllable Co-Cu bimetallic oxide nano-catalyst, and the controllable Co-Cu bimetallic oxide nano-catalyst is applied to electro-catalysis, so that low-concentration nitrate pollutants in high-salinity wastewater can be efficiently removed. According to the preparation method, a constant-voltage electrodeposition method is utilized, the atomic-scale dispersed Co-Cu double-active-site catalyst is constructed on a foamed nickel substrate, and the prepared bimetallic Co-Cu active-site catalyst can remove low-concentration nitrate pollutants efficiently and highly selectively and is suitable for purification of nitrate wastewater with a wide pH range and different concentrations. The method is easy to operate, high in stability and good in electrocatalytic activity, and a reliable solution with practical application potential is provided for green low-carbon electrocatalytic purification of high-salt nitrate wastewater.

The invention relates to the technical field of nano-catalysts, and discloses a preparation method and application of a ZnxCd1-xS nano-catalyst rich in sulfur vacancies, the preparation method of the ZnxCd1-xS nano-catalyst rich in sulfur vacancies is characterized by comprising the following steps: S1, mixing cadmium salt, zinc salt and thiourea in deionized water to obtain a mixed solution; and S2, putting the mixed solution into a reaction kettle for heating reaction, cooling, collecting a reaction product, washing the reaction product with deionized water, and drying the washed reaction product to prepare the ZnxCd1-xS nano-catalyst. The ZnxCd1-xS nano-catalyst synthesized by the method is uniform in dispersion, uniform in size and regular in morphology, the morphology of the obtained ZnxCd1-xS nano-catalyst is evolved into a litchi-shaped transition state with a rough surface from a spherical shape along with the rise of the reaction temperature, and then a pine tree-shaped morphology with the regular morphology is generated. In addition, the prepared catalyst is rich in certain sulfur vacancies, and the performance is remarkably improved when the catalyst is applied to the field of photocatalytic hydrogen evolution.

The invention provides a method for synthesizing diol from glucose, which comprises the following steps: adding glucose, a catalyst and deionized water into a reaction kettle, and carrying out heating catalytic reaction in a hydrogen atmosphere to obtain diol, the main product of which is butanediol; wherein the catalyst is a Pd-WO3 composite nano catalyst loaded by a carrier. The catalyst can be used for preparing diol, the novel catalyst is formed by combining the carrier and the specific composite nano-catalyst, the combination can selectively catalyze glucose to be converted into 1, 2-butanediol under mild conditions, and compared with an existing metal catalyst, the catalyst has higher catalytic efficiency and conversion rate; meanwhile, the catalyst is stable in activity and longer in service life, so that the production cost is reduced, and the production efficiency is improved; in addition, the preparation process of the catalyst is simple, the catalyst can keep excellent catalytic activity in the recycling process, and compared with an existing catalyst preparation process, the preparation method has higher production efficiency and economic benefits.

A method for preparing a transition metal electrochemical catalyst according to an embodiment of the present disclosure includes dissolving a nitrogen precursor and a transition metal precursor in a polyol-based solvent so as to prepare a solution in which transition metal ions and free anions are coordinated, and mixing same with a support so as to prepare a mixture, igniting the mixture so as to carbonize the polyol-based solvent, thereby forming transition metal nanoparticles encompassed by carbon, performing heat treatment in order to carbonize remaining organic matter contained in the mixture, and removing, through acid treatment, impurities and transition metal nanoparticles not encompassed by carbon, and then removing remaining acid through washing and additional heat treatment, thereby a nanocatalyst having a structure in which a single-atom transition metal-nitrogen bonding structure and / or transition metal nanoparticles encompassed by carbon exist is synthesized.

The invention relates to the technical field of catalysts, in particular to preparation and application of a B-site La-doped magnetic nano ZnFe2O4 catalyst.The preparation method of the catalyst comprises the following steps that zinc nitrate, ferric nitrate, lanthanum nitrate and cerous nitrate are selected as base materials, the molar ratio of the zinc nitrate to the ferric nitrate to the lanthanum nitrate to the cerous nitrate is 1: 1.5: 0.5: 0.3, and the molar ratio of the zinc nitrate to the ferric nitrate to the lanthanum nitrate to the cerous nitrate is 1: 1.5: 0.5: 0.3; zinc nitrate, ferric nitrate, lanthanum nitrate and cerous nitrate are dissolved in a eutectic solvent in proportion, then modified citric acid is added as a complexing agent for mixing, and carbon nanotube powder and zinc acetate are added in the process. According to the scheme provided by the invention, the B site of the catalyst is directionally occupied by La, Zn < 2 + > activity loss caused by A site doping is avoided, the stability and catalytic effect of the catalyst are improved by adding Ce, the carbon nanotubes and zinc acetate, and the removal rate of the catalyst to high-concentration or refractory organic matters is improved.

The invention discloses a nano noble metal-based oxidation catalyst as well as preparation and application thereof, and belongs to the technical fields of preparation of nano catalysts and catalytic conversion of biomass derivatives. The nano noble metal-based oxidation catalyst comprises a core-shell structure as a carrier and nano noble metal particles (such as Pt) loaded on the core-shell structure; wherein the core-shell structure takes a cerium-based oxide as a core and takes a metal oxide as a shell; pt is loaded on the surface of the cerium-based oxide. When the catalyst is used for catalyzing glycerol oxidation to prepare glyceric acid, high glycerol conversion rate (as high as 90%) and high glyceric acid selectivity (as high as 99%) under an alkali-free condition can be realized.

The invention relates to the technical field of catalysts, in particular to a nano-catalyst for preparing methane through hydrogenation of carbon dioxide, the nano-catalyst is prepared from a eutectic solvent as a carrier precursor through a coprecipitation method, the nano-catalyst comprises a carrier, and NiO is loaded on the carrier; on the basis of the total mass of the nano-catalyst, the content of NiO is 5-20 wt%, and the content of the carrier is 80-95 wt%; the average particle size of the nano-catalyst is 5-10 nm; the carrier is selected from one or more of CeO2, ZrO2, MgO and Al2O3. According to the nano-catalyst, the dispersity and stability of NiO particles are effectively enhanced by using the eutectic solvent as a carrier precursor and a solvent, high-density Ni-OV interface sites are constructed in situ by using an alkali treatment method, the adsorption and activation of the catalyst on H2 and CO2 are promoted, the higher CO2 conversion rate is shown, and the catalyst has a good application prospect. The catalyst for efficiently obtaining a single product CH4 at a low temperature and with high selectivity has a higher application value.

The invention relates to the technical field of catalysts, in particular to a nano-catalyst, a preparation method of the nano-catalyst and application of the nano-catalyst in a reverse water-gas shift reaction. According to the nano-catalyst provided by the invention, Pt is successfully packaged in a pore channel of the S-1 molecular sieve with the meso-micro hierarchical pore structure through hydro-thermal treatment, and due to the fact that meso pores are introduced into the S-1 molecular sieve with the meso-micro hierarchical pore structure, mass transfer hindrance is effectively reduced, and then the activity of the catalyst is greatly improved; meanwhile, Pt sintering is hindered due to the confinement effect of molecular sieve pore channels, so that the stability of the catalyst is maintained; therefore, the nano-catalyst provided by the invention has better stability in the reverse water-gas shift reaction. Tests show that the nano-catalyst provided by the invention still has higher activity, carbon monoxide selectivity and carbon dioxide conversion rate after the reaction is performed for 50 hours in the process of catalyzing the reverse water-gas shift reaction.

The invention discloses a preparation method of a Ru-WO3 nano-catalyst and a product and application of the Ru-WO3 nano-catalyst, the preparation method of the Ru-WO3 nano-catalyst comprises the following steps: adding ammonium metatungstate into deionized water, stirring to obtain a solution A, then adding citric acid into the solution A to obtain a solution B, mixing the solution B and a titanium felt, and carrying out hydrothermal reaction to obtain a WO3-x carrier; the preparation method comprises the following steps: dipping a WO3-x carrier in a RuCl3 aqueous solution to obtain a Ru-WO3-x precursor; the Ru-WO3-x precursor is subjected to calcination, and a Ru-WO3 nano catalyst is obtained; the mass ratio of the ammonium metatungstate to the citric acid is 2.4 to 10. The Ru-WO3 nano-catalyst prepared by the preparation method is high in activity and selectivity, and is beneficial to improving the synthesis efficiency of electrically driven ethylene glycol.

The present invention relates to a PtSn disordered alloy sub-nanometer catalyst for propane dehydrogenation. The catalyst uses γ-Al2O3 nanospheres as a carrier, and the active component Pt is diluted to a single-atom dispersion state by excessive Sn. During the high-temperature H2 reduction process, the Sn atoms around Pt are reduced by the hydrogen spillover effect of Pt atoms, and finally a PtSn disordered alloy sub-nanometer catalyst is formed. Among them, the mass percentage of Pt is 0.01-0.1%, the mass percentage of Sn is 0.08-2%, and the mass ratio of Pt to Sn is 1:10-1:12. This PtSn disordered alloy sub-nanometer catalyst has a simple preparation process and excellent catalytic performance, with high reaction activity and strong stability, and has broad application value in reducing the consumption of precious metals and improving reaction activity.

The invention provides a hydrotalcite-derived copper-based nano-catalyst as well as a preparation method and application thereof. The hydrotalcite-derived copper-based nano-catalyst provided by the invention can effectively improve the yield of methanol in a CO and / or CO2 hydrogenation reaction process and keep excellent activity and selectivity of the catalyst. According to the present invention, the characteristic that the active metal component prepared after the structure topology transformation is highly dispersed and still maintains the intercalation structure is utilized by using the characteristic that the metal element composition ratio of the hydrotalcite is adjustable and the parameters of the structure topology transformation process are controllable, such that the microstructure regulation of Cu in the Cu-based nano-catalyst is achieved. The Cu-based nano-catalyst prepared by the method is good in Cu dispersity, the geometric structure and electronic characteristics of a metal-carrier interface can be regulated and controlled, and when the Cu-based nano-catalyst is used for CO / CO2 hydrogenation reaction, the Cu-based nano-catalyst shows excellent catalytic reaction performance and can be popularized and applied to various heterogeneous catalytic reaction fields such as hydrogenation and dehydrogenation.

The invention provides a carbon nanotube / silicon three-dimensional composite material and a preparation method and application thereof.The preparation method comprises the steps that spherical silicon powder is dispersed in a solution containing an alkaline activator, then a zwitterionic surfactant solution and a silane coupling agent are sequentially added, ultrasonic treatment is conducted, and active spherical silicon powder is obtained; the method comprises the following steps: dispersing active spherical silicon powder in an alcoholic solution of transition metal salt and rare earth metal salt, and then carrying out heat treatment on the obtained mixed solution by adopting a three-stage heat treatment process so as to load a core-shell structure nano catalyst on the surface of the active spherical silicon powder, and putting the product obtained in the previous step into a tubular furnace, introducing inert gas and carbon source gas into the tubular furnace in a pulse type atmosphere switching mode, then introducing an oxygen-containing organic matter, and carrying out a reaction so as to realize radial arrangement and growth of the carbon nanotubes, thereby obtaining the carbon nanotube / silicon three-dimensional composite material. The carbon nanotube / silicon three-dimensional composite material disclosed by the invention shows excellent structural stability and excellent electrical properties.

The invention relates to the technical field of separation and extraction, and provides an extraction method and application of chlorogenic acid in honeysuckle. The invention relates to a method for extracting chlorogenic acid from honeysuckle, which comprises the following steps: mixing honeysuckle powder with an ethanol solution, and carrying out ultrasonic enzymolysis; carrying out suction filtration to obtain a supernatant A containing chlorogenic acid and medicine residues I, and adding an ethanol solution into the medicine residues I to carry out microwave extraction; performing suction filtration to obtain a filtrate B and medicine residues II, mixing the medicine residues II with a citric acid-sodium citrate buffer solution, adding a Fe3O4-coated GO-coated MOFs nano-catalyst, performing hydrothermal reaction, performing suction filtration to obtain hydrolysate, and combining the hydrolysate with the supernate A and the filtrate B to obtain a total extraction solution; concentrating the total extracting solution under reduced pressure, and recovering ethanol until the volume of the concentrated solution is about 1 / 6-1 / 8 of the original volume; and concentrating under reduced pressure to thick paste, and drying to obtain the chlorogenic acid. The extraction efficiency and yield of chlorogenic acid are improved, and the utilization rate of raw materials and the product purity are improved.