594 results about "Gel method" patented technology

The invention belongs to the technical field of catalytic oxidation of carbon-containing industrial waste gas, and particularly relates to a Pd catalyst for catalytic combustion of carbon-containing waste gas as well as a preparation method and application of the Pd catalyst. The invention provides a Pd catalyst for catalytic oxidation of carbon-containing industrial waste gas such as CO and volatile organic pollutants VOCs. The Pd catalyst is obtained by compounding an amorphous CeO2 nano-cluster with a TiO2 substrate (marked as cCeO2 / TiO2) and indirectly regulating the form of Pd through gradient regulation of the content of the amorphous CeO2 nano-cluster by a sol-gel method on the basis of strong interaction of Pd and Ce species. The Pd catalyst prepared by the invention shows excellent low ignition temperature, high performance and certain universality in the catalytic combustion process of carbon-containing industrial waste gases such as CO and low-chain VOCs (Volatile Organic Compounds). In addition, the method for preparing the Pd catalyst is simple to operate and mild in condition, and has great industrial application potential and value.

The invention discloses a large-current-carrying-capacity flexible power cable, which belongs to the technical field of cable preparation, is used for solving the technical problem that the flame retardant property and the mechanical property of the power cable need to be further improved in the prior art, and specifically comprises a cable core, a wrapping layer, an insulating layer and a sheath layer which are sequentially arranged from inside to outside. The preparation method comprises the following steps: preparing alkoxy silane containing a benzocyclobutene group, preparing flame-retardant particles by using a sol-gel method, preparing modified polyurethane by using modified polysiloxane and 2, 5-furandimethanol as soft segments, naphthalene diisocyanate as a hard segment and trimethylolpropane as a chain extender, and preparing the flame-retardant flame-retardant polyurethane. The linear low-density polyethylene, the MAH-g-PE, the modified polyurethane, the flame-retardant particles and the auxiliary additive are melted and extruded outside the wire core to form the insulating layer, so that the power cable is obtained, the flame-retardant property of the power cable is effectively improved, and the mechanical property and the current-carrying stability of the power cable are also improved.

The invention discloses a preparation method of low-carbon-content high-purity quartz sand, which comprises the following steps: carrying out alkaline hydrolysis and drying on organosilane to obtain alkaline xerogel, putting the alkaline xerogel into a quartz tube of a rotary tube furnace, starting the furnace body, adjusting the rotation rate, heating to a specific low temperature, and introducing nitrogen to replace air; introducing oxygen, controlling the pressure, carrying out oxidation reaction, relieving the pressure to normal pressure after the reaction, pumping and discharging the product, and repeating the oxidation and pumping steps for many times until the tail gas carbon dioxide reaches the standard; raising the temperature, introducing chlorine-containing gas for purification, finally raising the temperature to a sintering temperature, and sintering in an air atmosphere to obtain the low-carbon-content high-purity quartz sand. According to the preparation method, the energy consumption and the equipment cost of the carbon removal procedure are greatly reduced, the specific surface area and the densification performance of the subsequent high-purity quartz sand product can be guaranteed, and a technical path which is low in energy consumption, high in efficiency and capable of giving consideration to the product performance is provided for industrial preparation of the high-purity quartz sand through a sol-gel method.

The invention discloses a high-resilience eTPU foaming material and a preparation process thereof, and belongs to the technical field of foaming materials. The process comprises the steps of raw material premixing and TPU chain extension reaction, precursor system injection, in-situ phase change energy storage core-shell particle generation, supercritical two-fluid foaming and molding post-treatment. Wherein the SiO2-coated TiO2 core-shell particles are prepared by a non-hydrolytic sol-gel method, the porous SiO2 core adsorbs and fixes the micro-crosslinked polyurethane-based phase change material, the TiO2 shell provides sealing and supporting, the particles are combined with the TPU matrix through covalent bonds, and the micro-crosslinked polyurethane-based phase change material has a unique micro-crosslinked network structure, so that the thermal conductivity of the TPU matrix is improved, and the thermal conductivity of the TPU matrix is improved. The hidden danger of leakage of the phase change material in the using process can be effectively eliminated, and meanwhile the interface bonding effect between the inorganic particles and the TPU matrix is synchronously enhanced. The eTPU foaming material prepared by the invention has the characteristics of high resilience, strong interface bonding, excellent energy storage stability and low compression set, and is suitable for shoe materials, automotive interiors and other scenes.

The invention provides a preparation method of a metal-based ceramic composite membrane with a catalytic ozone function. The preparation method comprises the following steps: preparing functional powder by taking tetrabutyl titanate as a titanium source and silver nitrate or ferric nitrate as a catalytic active metal source and adopting a sol-gel method; a porous metal pipe is used as a supporting body, metal powder and functional powder which are made of the same material as the supporting body are mixed to prepare functional slurry, the functional slurry is evenly deposited on the inner wall of the supporting body through vacuum filtration, and powder particles which are not firmly combined are removed through back flushing; and finally, the binding force between the functional film layer and the metal matrix is improved through high-temperature heat treatment. Wherein the thermal expansion coefficient difference between the metal supporting body and the functional film layer can be reduced by adding the metal powder, the metal powder is melted and diffused in the high-temperature heat treatment stage, and metallurgical bonding is formed between the functional powder and the metal substrate. The method is simple in process, and the prepared metal-based ceramic composite membrane has the advantages of being high in membrane layer binding force, not prone to falling off, high in catalytic activity, high in anti-pollution capacity, stable in operation and the like.

The invention relates to the technical field of solar cells, in particular to a CZTSSe absorption layer film and a preparation method and application thereof, and the preparation method comprises the following steps: S1, preparing a CZTS precursor solution of a DMF solution system; s2, preparing a CZTS precursor film by adopting a sol-gel method; and S3, coating the CZTS precursor thin film with a NaF solution with the concentration of 0-0.2 mol / L, and then carrying out drying and selenylation treatment to obtain the CZTSSe absorption layer thin film. According to the invention, the CZTS precursor film prepared by using the green and environment-friendly solvent DMF is used for carrying out a NaF solution spin-coating annealing process, so that the improvement of the battery efficiency is successfully realized. The change of CZTSSe film element redistribution, defect chemical environment and grain boundary potential difference after the Na element is doped is avoided.

The invention relates to an aerogel-derived ultralow-temperature water-sulfur poisoning-resistant flue gas denitration catalyst and a preparation method thereof, and belongs to the technical field of air pollution control and environment catalytic material frontier. CeMnNiOx composite oxide is used as an active component of the catalyst, a catalyst precursor gel with a three-dimensional network structure is formed through a sol-gel method, and then the hydrophobic aerogel derivative denitration catalyst with a high specific surface area, low density and a three-dimensional porous structure is obtained through aging, freeze drying and high-temperature heat treatment. The denitration efficiency of the catalyst can reach 90% or above at the temperature of 80-270 DEG C in a complex atmosphere containing 5-10% of water vapor and 50-100 ppm of SO2. The method is suitable for deep purification of NOx in ultralow-temperature and high-humidity SO2-containing complex flue gas after industrial desulfurization and dust removal.

The invention discloses a doped perovskite catalyst with a noble metal exposed on the surface, a preparation method and application thereof, belongs to the technical field of catalytic materials, and particularly relates to application in catalytic removal of volatile organic compounds. The method comprises the following steps: performing composite molding on rare earth elements / alkaline earth metals, transition metals and noble metals by adopting a sol-gel method, and performing strong acid surface etching and other operations. The surface of the catalyst is provided with a noble metal nanocluster or noble metal nanoparticle structure, so that the surface area is increased, more active sites can be provided, the adsorption of reactant molecules is enhanced, and the conversion rate and selectivity of a catalytic reaction are further improved. Based on the structure and performance advantages, the catalyst disclosed by the invention can be used for efficiently removing volatile organic compounds, can effectively reduce the initial temperature of the catalytic oxidation reaction of the volatile organic compounds, and has a wide application prospect in treating various industrial processes needing high-temperature and efficient catalysis.

The invention discloses a method for preparing high-toughness silicon nitride ceramic from Si3N4 and multi-element rare earth additive core-shell structure powder, multi-element rare earth nitrate, tetraethoxysilane and Si3N4 powder are used as main raw materials, elements of a multi-element rare earth sintering additive system are uniformly distributed through a sol-gel method, and silicon nitride particles are uniformly coated, so that the high-toughness silicon nitride ceramic is prepared. A uniform liquid phase can be provided for dominant development of silicon nitride crystal grains, so that full development of double-peak morphology of the silicon nitride crystal grains is promoted, and the bending strength and fracture toughness of the silicon nitride ceramic are improved.

The invention relates to the field of textiles, and particularly discloses a preparation process of antibacterial fibers, which comprises the following steps: S1, respectively drying and preparing polymer slices and an antibacterial agent; s2, performing melt spinning on the polymer slices and an antibacterial agent, performing air cooling, and then performing traction and winding to obtain antibacterial fibers; wherein the antibacterial agent is prepared by mixing dodecyl trimethyl ammonium chloride, polyvinylpyrrolidone and core-shell type antibacterial particles according to the mass ratio of (0.4-0.5): (0.1-0.2): 1, the core-shell type antibacterial particles are prepared by loading nano-zinc oxide and nano-silver particles on intercalation modified montmorillonite and then forming a silicon dioxide coating layer through a sol-gel method, and the core-shell type antibacterial particles are prepared from the silicon dioxide coating layer through a sol-gel method. And carrying out spray drying to obtain the core-shell antibacterial particles. The preparation method has the characteristic of improving the antibacterial durability and uniformity of the antibacterial fiber.

The invention discloses a preparation method of an iron-doped cerium-based perovskite type high-selectivity Cu ion capture stabilizing agent and application of the stabilizing agent in heavy metal pollution remediation, and the stabilizing agent is prepared through a sol-gel method and comprises the steps that cerous nitrate and citric acid are dissolved in water, and the mixture is heated and stirred to be gel-shaped; standing the gel solution in a drying oven at a constant temperature to obtain a Fe-Ce-PVSK precursor; grinding the precursor into powder, putting the powder into a quartz boat, and calcining in an air atmosphere through a horizontal tube furnace to obtain a product; and finally, washing to be neutral to obtain the iron-doped cerium-based perovskite stabilizing agent. Due to the high oxygen vacancy concentration and rich active sites, the stabilizing agent has high selectivity and high adsorption capacity and has specific capturing capacity on Cu < 2 + >. The preparation method has mild reaction conditions. The stabilizing agent can effectively reduce the bio-availability of heavy metals in a polluted matrix, promote healthy growth of plants, and realize pollution restoration and ecological function recovery at the same time.

The invention relates to an SCR (Selective Catalytic Reduction) denitration catalyst carrier and a preparation method and application thereof, and the preparation method comprises the following steps: (1) crushing a waste FCC (Fluid Catalytic Cracking) catalyst, performing roasting treatment, and performing dry ball milling after roasting to obtain powder; (2) adding the powder into a mixed acid solution for pickling treatment, wherein the mixed acid comprises inorganic acid and organic acid; (3) filtering and washing the material subjected to acid pickling treatment to obtain a solid, and drying and roasting the solid to obtain molecular sieve carrier powder; and (4) mixing the carrier powder with TiO2 by a sol-gel method to prepare a composite carrier, namely the SCR denitration catalyst carrier. The waste FCC catalyst is used as a raw material to prepare the SCR denitration catalyst carrier, and the carrier has the advantages of low heavy metal content, high active component content, good water resistance and the like.

The invention provides core-shell structure reinforced white carbon black / graphene oxide hybridized glass-lined porcelain glaze and a preparation method thereof. The porcelain glaze is composed of a basic glaze material and a core-shell structure hybrid reinforcement phase dispersed in the basic glaze material, the reinforcement phase takes white carbon black as a core and zirconium oxide as a shell, and a three-dimensional hybrid network formed by KH-560 grafted cellulose nanocrystals or carbon nanotubes and graphene oxide is constructed between the core and the shell. The preparation method mainly comprises the following steps: carrying out pre-dispersion and in-situ hybridization on the white carbon black, the graphene oxide and the one-dimensional nanofibers through a silane coupling agent; constructing a three-dimensional network under a catalytic condition by using a sol-gel method; a stable core-shell structure is formed through a deposition reaction of zirconium sol; finally, the obtained composite slurry is compounded with basic glaze with specific components, rapid densification is achieved through microwave sintering, and the product is particularly suitable for chemical reaction kettle glass lining with strict requirements for corrosion resistance and impact resistance.

The invention relates to lead-free glass-coated copper powder for an HJT photovoltaic cell, conductive copper paste and a preparation method of the lead-free glass-coated copper powder and the conductive copper paste, the glass-coated copper powder comprises nano-copper powder and a coating layer on the surface of the nano-copper powder, and the coating layer is composed of bismuthate glass. According to the preparation method, a sol-gel method is adopted, the bismuthate glass is coated on the nano copper powder, the glass and the copper powder form a core-shell structure, the glass can be molten into a liquid phase during sintering, the contact between the glass and the copper powder is more uniform, and the oxidation resistance of the copper powder is enhanced. The prepared glass-coated copper powder can effectively isolate the copper powder from being in contact with an external oxidizing agent, excellent anti-oxidation protection is provided, the rapid oxidation point of the copper powder is increased by 100-150 DEG C compared with the rapid oxidation point of the copper powder before coating, and the service life of the copper powder is prolonged; meanwhile, the conductive copper paste has high stability, high reliability, low cost and high conductivity, and meets the environmental protection requirement.

The invention discloses a high-entropy ferric pyrophosphate sodium ion battery positive electrode material and a preparation method thereof, and belongs to the field of battery positive electrode materials. The chemical formula of the positive electrode material is Na4Fe3-aMa (PO4) 2P2O7 (0.05 < = a < = 0.5), M is a metal element and comprises at least five of cobalt, magnesium, zirconium, zinc, aluminum, molybdenum, copper, manganese, nickel, calcium and chromium, the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is spherical, and the surface of the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is coated with an amorphous carbon layer. The preparation method adopts a sol-gel method and comprises the following steps: mixing an iron source, a doped metal source, sodium pyrophosphate, ammonium dihydrogen phosphate and citric acid monohydrate according to a stoichiometric ratio, stirring, gelatinizing and drying to obtain xerogel, and calcining through a two-stage hydrogen-argon mixed gas to obtain the iron-doped metal-doped sodium pyrophosphate / citric acid composite material. The crystal structure is optimized by means of the high-entropy synergistic effect, the electron conductivity and the Na < + > diffusion rate are improved, and the industrial adaptability of the spherical morphology and the structural stability of carbon coating are combined.

The invention discloses a hydrogenated butadiene-acrylonitrile rubber composite material for cryogenic heat preservation and a preparation method thereof in the field of polymer composite materials, and the composite material is characterized in that zirconium-silicon composite modified hydroxyapatite and boron-nitrogen co-doped mesoporous alumina are introduced, so that the mechanical property and heat preservation effect of the material in a low-temperature environment are remarkably improved. The zirconium-silicon oxide network is constructed on the surface of hydroxyapatite by adopting a sol-gel method, and the doped mesoporous structure with the high specific surface area is obtained by adopting alkoxide as a precursor through hydrothermal treatment and calcination. When the rubber is mixed, the functional filler is dispersed at a high temperature, and then the plasticizer is added to ensure uniform distribution of the filler. The obtained composite material has excellent tensile strength, elongation at break and low heat conductivity coefficient at the liquid nitrogen temperature, and is suitable for the cryogenic thermal insulation fields of hydrogen energy storage and transportation, aerospace sealing and the like. All the raw materials are commercially available chemicals, the process is controllable, and industrial production is easy.

The invention discloses a monovalent alkali metal ion doped iron-based perovskite type ceramic membrane as well as a preparation method and application thereof, and belongs to the technical field of mixed conductor oxygen permeation ceramic membrane materials. The method comprises the following steps: (1) synthesizing layered rock salt oxide M1 by adopting an EDTA-CA (Ethylene Diamine Tetraacetic Acid-Carboxylic Acid) sol-gel method; (2) mixing the M1 with other metal carbonate or oxide according to the stoichiometric ratio of the target perovskite oxide M2, and preparing a solid precursor M1 + M2 through a solid-phase reaction method; and (3) sintering the precursor into a compact ceramic membrane by using a static pressure-roasting method. According to the invention, the problem that monovalent alkali metal ions are easy to volatilize in a high-temperature solid-phase reaction is effectively solved through a process of stabilizing the alkali metal at a low temperature and then forming a film at a high temperature, and the monovalent alkali metal ions are successfully doped into iron-based perovskite crystal lattices. The prepared ceramic membrane has the advantages that the oxygen permeation flux is obviously improved while the good structural stability is maintained, and the ceramic membrane is particularly suitable for oxygen separation in an oxygen-enriched combustion process.

This invention provides an LLATO@ferroelectric phase NBTO solid electrolyte material, its preparation method, and its application, belonging to the field of lithium-ion solid electrolyte technology. This invention employs a sol-gel method for mixing and calcination to synthesize NBTO ferroelectric phase-coated LLATO lithium-ion conductors (Li). 0.33 La 0.457 Ag 0.1 TiO3@ x wt% Na 0.5 Bi 0.5 TiO3 (0< x ≤6). The LLATO@ferroelectric phase NBTO solid electrolyte material of the present invention exhibits excellent comprehensive performance, with a room temperature ionic conductivity of σ=1.08×10⁻⁶. ‑3 S / cm, relative to the room temperature ionic conductivity of the uncoated LLATO solid electrolyte (1.54 × 10⁻⁶). ‑4 The voltage (S / cm) is improved by an order of magnitude. In lithium symmetric battery tests, it maintains stable cycling after 2000 charge-discharge cycles at 0.1 mA and maintains stable voltage output at 1 mA.

The invention belongs to the technical field of synthesis of 2, 3-dipicolinic acid, and relates to a catalyst for synthesizing 2, 3-dipicolinic acid as well as a preparation method and application thereof, the catalyst is prepared from a carrier, and active components and auxiliaries loaded on the carrier; the carrier is boron nitride modified aluminum oxide, the active component is palladium-cobalt bimetal, and the auxiliary agent is magnesium; the catalyst comprises the following components in percentage by mass: 0.2 wt%-3wt% of palladium, 0.5 wt%-4wt% of cobalt, 0.05 wt%-0.3 wt% of magnesium, 5wt%-15wt% of boron nitride and the balance of an aluminum oxide carrier. The catalyst is prepared by adopting an ultrasonic-assisted sol-gel method, so that high dispersion and strong interaction of active components are realized. The catalyst shows high catalytic activity, high selectivity and excellent stability in a dichloropyridine carbonylation reaction, carbon monoxide is used as a carbonyl source, the atom economy is high, and the green chemical requirement is met.

The invention relates to Al2O3 / C powder as well as a preparation method and application thereof, and belongs to the field of ceramic powder preparation. The invention relates to a preparation method of Al2O3 / C powder, which comprises the following steps: by taking aluminum acetate as a raw material, acrylamide as an organic monomer, N, N '-methylenebisacrylamide as a cross-linking agent and ammonium persulfate as an initiator, forming polymer gel with a three-dimensional network structure through a sol-gel method, and drying to obtain dry gel powder; and pyrolyzing the dry gel powder in nitrogen to obtain Al2O3 / C powder with a porous structure characteristic. According to the invention, acrylamide is utilized to form gel with a three-dimensional network structure, Al < 3 + > is trapped in pores of the gel structure, so that an aluminum source and a carbon source are uniformly distributed on a molecular level, and growth of Al2O3 particles is effectively inhibited by utilizing an isolation effect of C and combining a rapid heating process, so that the diffusion distance of a substance for forming AlN is greatly shortened, and the preparation process is simplified. According to the method, rapid formation of AlN is promoted, the reaction time is effectively shortened, the efficiency is improved, and the obtained pure-phase AlN powder is small in particle size.

The application provides a calcium-based bifunctional material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a calcium salt solution and an organic template agent, stirring under heating conditions, forming a gel, and then drying and calcining to obtain a calcium carbonate adsorption component; preparing a rare earth metal oxide by using a hydrothermal method, and then loading a transition metal on the rare earth metal oxide by using an impregnation method to obtain a transition metal supported catalytic component; and placing the adsorption component and the catalytic component in a hydrogen-rich atmosphere after physical mixing and calcining to obtain the calcium-based bifunctional material. According to the method, the preparation process of the adsorption component is controlled, the calcium carbonate is first generated by using a sol-gel method and low-temperature calcining, and the calcium carbonate is mixed with the catalytic component and then hydrogen-rich calcining is performed to generate porous calcium oxide, so that the sintering of the calcium oxide in the high-temperature preparation process is avoided; the method has the advantages of simple process, excellent performance, low energy consumption and good industrial application value.

The invention discloses a visual efficient chloride ion removal adsorbing material and a preparation method and application thereof.The adsorbing material is prepared by the steps that hollow glass microspheres serve as a carrier, and hollow glass porous particles are synthesized from a mixture of hollow glass microsphere powder and a pore forming agent through a sol-gel method; the preparation method comprises the following steps: modifying the surface of a porous adsorption material through a low-temperature plasma bombardment technology to enhance the adsorption performance on chloride ions, and loading magnetic iron oxide nanoparticles on the porous adsorption material to prepare the chloride ion adsorption material; the adsorption material has the characteristic of environmental friendliness, not only can efficiently adsorb chloride ions in a water body, but also can realize the visualization of the adsorption process through the density difference before and after adsorption, has the characteristics of repeated use and easiness in regeneration, and has relatively high market application prospect and economic value.

The invention discloses a preparation method of a copper-palladium alloy loaded nano titanium dioxide semiconductor material as a catalyst for a carbon dioxide reduction reaction. Firstly, alloy nanoparticles are generated through a sol-gel method, the morphology of the nanoparticles is controlled and agglomeration is prevented through oleylamine and oleic acid, and borane-tert-butylamine is added at the temperature of 170 DEG C to regulate and control the sizes of the generated alloy nanoparticles. A series of characterizations prove that the catalyst has a very good particle loading condition, uniform particle distribution and increased reaction active sites, and shows excellent activity when being applied to a carbon dioxide reduction reaction, when the loading capacities of copper and palladium are respectively 1%, the activity of the obtained catalyst is the highest, the methane generation rate can reach 20.23 mol / g / h, and the methane generation rate can reach 20.23 mol / g / h. The selectivity of methane reaches 100%.

The invention belongs to the technical field of copper composite material preparation, and particularly relates to a preparation method of a single-walled carbon nanotube-copper composite material. The preparation method comprises the following steps: preparing a single-walled carbon nanotube by adopting a floating catalysis method, sequentially carrying out acid pickling and high-temperature repair purification, then carrying out mixed acid gradient oxidation on the single-walled carbon nanotube, modifying cobalt nanoparticles on the surface of the single-walled carbon nanotube through chemical deposition, and then compounding an amorphous titanium oxide coating on the modified single-walled carbon nanotube by utilizing a sol-gel method, so as to obtain the cobalt-doped carbon nanotube composite material. Adding the composite powder into molten copper, uniformly mixing under the auxiliary stirring of ultrasound and a magnetic field in a specific direction, and finally, quickly solidifying and thermally drawing into a copper rod through a hot continuous casting method under the assistance of a continuous magnetic field, so as to obtain the single-walled carbon nanotube-copper composite material. According to the method, the dispersity and the interface bonding strength of the single-walled carbon nanotubes in the copper matrix are improved, and the single-walled carbon nanotubes are directionally arranged in the copper matrix; the method is simple in process, and the prepared composite material has excellent electric conduction, heat conduction and mechanical properties.

The application relates to a preparation and application of a molybdenum and indium co-modified cobalt-based catalyst for carbon dioxide hydrogenation synthesis of low-carbon alcohol, belonging to the field of catalysis. Co is used as an active component, In and Mo components are introduced, an alkali metal K additive is introduced, an In and Mo co-modified Co-based oxide precursor is created by adopting a sol-gel method, the precursor is reduced by hydrogen, and is further activated by CO2+H2, so that the In and Mo co-modified Co2C catalyst is obtained; the catalyst is used in a reaction of carbon dioxide hydrogenation for preparing low-carbon alcohol, under the condition that the reaction temperature is 340 DEG C and the reaction pressure is 3 MPa, the carbon dioxide conversion rate is more than 35%, and the low-carbon alcohol selectivity is close to 20%.

The invention discloses an oxygen-poisoning-resistant alumina-based carbonyl sulfide hydrolysis catalyst, a carbonyl sulfide hydrolysis fixed bed reactor and a carbonyl sulfide hydrolysis method, and aims to solve the problems that when an existing alumina-based catalyst is used for treating feed gas containing trace oxygen, the oxygen poisoning cannot be easily generated; active components are easy to oxidize and sinter, so that the catalyst is inactivated by oxygen poisoning, the service life is short, and the hydrolysis conversion rate is reduced. Comprising an alumina carrier, and an active component and an auxiliary agent which are loaded on the alumina carrier, the alumina carrier is alumina prepared by adopting a sol-gel method, taking aluminum alkoxide as an aluminum source, adding a modifier in a sol forming process, carrying out hydrolysis and polycondensation to form gel, drying and roasting; the active component is composed of an alkali metal active component and a transition metal oxide, and the auxiliary agent is a rare earth metal oxide; based on the total mass of the catalyst, the catalyst comprises the following components in percentage by mass: 10-18% of alkali metal active component, 5-12% of transition metal oxide and 3-8% of rare earth metal oxide.

The invention relates to the technical field of cork materials, in particular to SiO2-ZrO2 / cork composite particles and a preparation method and application thereof. The SiO2-ZrO2 / cork composite particles are prepared by adopting a sol-gel method, enabling SiO2-ZrO2 sol to be in full contact with and permeate into each cork particle through a vacuum impregnation process, and then forming a firm SiO2-ZrO2 layer on the surface of the cork particle after aging and freeze drying. On one hand, the ratio of silicon to zirconium is accurately controlled, the enhancement effect is maximized on the premise of avoiding particle aggregation, and the indentation damage resistance and wear resistance of the composite material are synergistically improved, and on the other hand, by regulating and controlling the volume ratio of the water-ethanol mixed solvent, the hydrolytic stability and the coating uniformity of sol are effectively improved, and the composite material has good application prospects. The bonding strength of SiO2-ZrO2 on a cork base is enhanced, the applicability of SiO2-ZrO2 to floors and wallboards is enhanced, and a reliable technical path is provided for development of high-performance environment-friendly building materials.

The invention relates to the technical field of biological medicines, in particular to a preparation method of protein cross-linked nano affinity microspheres, which comprises the following steps: preparing carboxylated silicon dioxide nano microspheres with the particle size of 500nm by adopting a sol-gel method, mixing tetraethoxysilane and ammonia water according to the volume ratio of 1: (3 + / -1), reacting in an ethanol solution at 40 DEG C for 6 hours, filtering, washing, and drying to obtain the protein cross-linked nano affinity microspheres. And centrifuging to obtain a microsphere precipitate, washing with deionized water for three times to finally obtain a nano microsphere suspension of which the surface is rich in carboxyl, and controlling the solid content to be 10 + / -0.5 mg / mL. The capturing efficiency of the finally prepared protein cross-linked nano affinity microspheres for exosomes reaches 95.0%, the binding capacity reaches 28.5 mu g / mg, the purity of the extracted exosomes is higher than that of an ultracentrifugation method, the biological activity and structural integrity of animal cell exosomes and plant cell exosomes are completely kept, and the protein cross-linked nano affinity microspheres are suitable for large-scale industrial production. The problems that in a traditional exosome extraction method, the recovery rate is low, impurity pollution is serious, exosome activity is damaged, and the application range is limited are solved.

This invention discloses a platinum-based catalyst for the hydrogenation reaction, its preparation method, and an electrode. The catalyst uses orthorhombic niobium pentoxide (T-Nb₂O₅) as a support to support the active component platinum. The support is resistant to strong acids and electrochemical corrosion at potentials above 1.0 V (vs RHE). The catalyst exhibits a hydrogenation reaction current density of not less than 200 mA·cm⁻¹ at 0.45 V (vs RHE). ‑2 In preparation, ammonium niobate oxalate hydrate was used as the niobium source, and the mixture was gelled via a sol-gel method. The gel was then heat-treated at 600-700℃ to obtain an orthorhombic niobium pentoxide support. The pH was adjusted to less than 3, and platinum was reduced with sodium borohydride to prepare the catalyst. This catalyst was then used to fabricate a hydrogen depolarization anolyte gas diffusion electrode with a platinum loading of 0.5-1.0 mg·cm³. ‑2 It can operate continuously and stably for no less than 120 hours with a cell voltage in the range of 1.25-1.45V. The catalyst of this invention has high activity and excellent stability, and can be used as a hydrogen depolarization anode in hydrometallurgy, significantly reducing electrolysis energy consumption and making it suitable for industrial applications.

This invention relates to a medium-temperature solid oxide fuel cell cathode material and its preparation method. The invention employs a sol-gel method to synthesize perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The material contains PrBaCo2O with a double perovskite structure. 5+δ BaCo with single perovskite structure 0.8 Zr 0.1 Y 0.1 O 3‑δ Two phases. Multiphase Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The sample achieved a conductivity of 100 S / cm within the operating temperature range of a mid-temperature solid oxide fuel cell. ‑1 At 700℃, the polarization impedance is 0.06 Ωcm. 2 This meets the requirements for cathode materials in solid oxide fuel cells. The electrolyte-supported single cell achieved a maximum power density of 710 mW / cm³ at 800℃. ‑2 The single cell underwent continuous and stable discharge at a constant current for 200 hours without performance degradation, demonstrating excellent output performance stability. In summary, perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ It is a potential cathode material for intermediate-temperature solid oxide fuel cells.