303 results about "Mass transfer resistance" patented technology

The invention relates to a membrane electrode with high oxygen permeability and a preparation method thereof, the membrane electrode comprises a proton exchange membrane, an anode catalyst layer and a cathode catalyst layer, the anode catalyst layer and the cathode catalyst layer are arranged on two sides of the proton exchange membrane, and anode catalyst slurry comprises an anode catalyst, an ionomer and a dispersing solvent in a mass ratio of 1: (1-10): (10-1000); the cathode catalyst slurry comprises a cathode catalyst, an ionomer, an ionic liquid and a dispersing solvent in a mass ratio of 1: (1-10): (1-10): (10-1000). Compared with the prior art, in order to solve the problem that oxygen mass transfer of a porous carbon carrier in a fuel cell catalyst layer is difficult, the method that ionic liquid and ionomer are mixed in advance, then slurry is prepared, and the slurry is sprayed to prepare the membrane electrode is adopted, so that a compact structure formed by an ionomer membrane on the surface of a catalyst is weakened, and the distribution uniformity of the ionomer membrane is improved; the local oxygen mass transfer resistance is obviously reduced, and the performance of the fuel cell under high current density is improved.

The invention discloses a screen cloth enhanced polybenzimidazole porous membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: fully mixing polybenzimidazole, a polar solvent and a template to obtain a mixed solution, coating a base material with the mixed solution, placing a polymer mesh on the previous base material, and carrying out in-situ compounding, polar solvent removal and film formation to obtain a compact mesh reinforced polybenzimidazole film; and then carrying out in-situ etching treatment to prepare the screen cloth enhanced polybenzimidazole porous membrane. The size and connectivity of ion channels in the membrane can be regulated and controlled by regulating and controlling the type and content of templates in the membrane casting process, and the polybenzimidazole porous layer can be ultrathin by combining the effect of enhancing the mechanical property of the polymer mesh cloth, so that the mass transfer resistance of the polybenzimidazole porous separation layer is remarkably reduced, and the performance of the membrane is improved. The mesh-reinforced polybenzimidazole porous membrane has good dimensional stability and pore uniformity, and has the characteristics of high ion selectivity, high ion conductivity and high stability.

The invention relates to the technical field of air electrode preparation, in particular to a metal-loaded super-hydrophobic air electrode, a preparation method and chlorine production application, the air electrode comprises a high-hydrophobicity gas diffusion layer obtained through polytetrafluoroethylene modification, and the metal-loaded super-hydrophobic air electrode is prepared through a corona etching and electrochemical in-situ deposition technology. A uniform and highly-dispersed metal catalyst layer directly grows on the surface of the polytetrafluoroethylene substrate, so that the gas diffusion electrode with excellent mass transfer performance and an efficient catalytic function is obtained; the prepared electrode is used for carrying out electrochemical catalysis on a water body containing chloride ions by adopting a cyclic voltammetry method, and active chlorine can be efficiently generated in situ; the prepared metal-loaded super-hydrophobic air electrode has the advantages of being low in oxygen mass transfer resistance, high in catalyst utilization rate, free of generation of by-products, capable of efficiently generating active chlorine and the like, and has wide application potential in actual water environment disinfection.

The invention relates to the technical field of new energy materials, and discloses a gradient porous three-dimensional interpenetrating network direct ammonia fuel cell membrane electrode. The gradient porous three-dimensional interpenetrating network direct ammonia fuel cell membrane electrode comprises an exchange membrane, an anode catalyst layer, a cathode catalyst layer and a gas diffusion layer, wherein the anode catalyst layer and the cathode catalyst layer have gradient pore size distribution from the exchange membrane side to the gas diffusion layer side; wherein the interiors of the anode catalyst layer and the cathode catalyst layer are provided with three-dimensional interpenetrating network structures. According to the invention, the utilization rate of the catalyst is improved by 30-50%, the mass transfer resistance is reduced by 40-60%, the interface contact is improved, the controllability of the preparation process is improved, the structural stability is enhanced, the power density of the direct ammonia fuel cell reaches 250-300mW / cm < 2 >, the performance retention rate after 5000 cycles can reach 85% or more, and the method has remarkable technical advantages and application prospects.

The invention belongs to the technical field of membrane separation, and particularly relates to a low-pressure high-flux polyamide / polysulfone hollow fiber composite nanofiltration membrane and a preparation method thereof. The preparation method of the composite nanofiltration membrane comprises the following steps: dissolving sulfonated polysulfone, poly (1-vinyl-3-butylimidazole) bromide and polyvinylpyrrolidone to prepare a spinning solution, and spinning to obtain a base membrane; carrying out hydrophilic modification on the base membrane by using 1, 3-propane sultone; then, an aqueous phase solution containing poly (gamma-glutamic acid) and triethylene tetramine and an organic phase solution containing trimesoyl chloride and 3, 5-diaminobenzoic acid are subjected to interfacial polymerization in the inner cavity of the modified base membrane to form a polyamide separation layer; and finally, carrying out heat treatment to obtain the composite nanofiltration membrane. Through the synergistic effect of zwitterionic ionization of the base membrane and biomacromolecule construction of the separation layer, the mass transfer resistance of water is remarkably reduced, unification of high flux and high selectivity is achieved, and good structural stability is achieved.

The invention discloses a method for extracting ginsenoside based on a supercritical extraction method, and relates to the technical field of traditional Chinese medicine extraction. The ginsenoside is extracted through a supercritical extraction method, the extraction process is convenient and efficient, the purity of the ginsenoside is high, organic solvent residues are avoided, the method is green and environmentally friendly, carbon dioxide can be recycled, and the operation cost is low; through degreasing pretreatment, fat-soluble components in ginseng powder are removed, the extraction purity of saponin is increased, the solid loading capacity of supercritical extraction is reduced, the mass transfer resistance is reduced, and the extraction efficiency is improved; the ginsenoside is purified in a post-treatment mode of resin adsorption and elution, polar impurities can be further removed, glutamine is adopted for surface functionalization of the resin, acylamino and carboxyl are introduced to the surface of the resin and can form hydrogen bonds with phenolic hydroxyl groups in the ginsenoside, functional adsorption is achieved, meanwhile, impurities are removed, and the content of the ginsenoside is increased. Reaction conditions are simple and mild, and adsorption efficiency is high.

The invention belongs to the technical field of hydrogen production by photothermal catalytic decomposition of seawater / sewage, and particularly relates to a construction method of a gas-gas-solid interface seawater desalination / sewage purification and in-situ hydrogen production reaction system. The reaction system consists of a bifunctional photo-thermal catalysis / evaporation material and a reaction device, solar energy is taken as an energy source, and seawater / sewage is taken as a reactant to carry out gas-steam-solid interface seawater desalination / sewage purification and photo-thermal decomposition of water to produce hydrogen. The bacterial cellulose hydrogel is used as a supporting substrate of a water supply substrate and a photo-thermal evaporation material, and the photo-thermal catalytic material is limited on an air-water interface, so that the stability of the photo-thermal catalyst is improved, and the defects of underwater light attenuation, large hydrogen mass transfer resistance and the like of a traditional liquid phase reaction system are overcome. Seawater desalination / sewage purification is synchronously realized, hydrogen is produced through in-situ decomposition of desalted water vapor, and the synchronous improvement of the seawater desalination / sewage purification rate and the in-situ water decomposition hydrogen production rate is promoted through the design of a gas-steam-solid interface reaction system.

The invention belongs to the technical field of membrane separation, and discloses an organic metal armored MXene membrane and preparation and application thereof.The preparation method comprises the steps that S1, lithium salt and an acid solution are mixed, a three-dimensional layered MAX raw material is added, stirring, centrifugal washing, ultrasonic treatment and centrifugation are conducted, and a two-dimensional MXene nanosheet dispersion liquid is obtained; and S2, adding an organic metal salt into the two-dimensional MXene nanosheet dispersion liquid, carrying out stirring reaction to carry out organic metal salt modification on MXene nanosheets, and carrying out vacuum filtration or blade coating or spin coating on a porous substrate with a modified MXene nanosheet colloidal solution to obtain the organic metal armored MXene film. MXene is modified through organic metal, interaction between solvent molecules and the MXene membrane is weakened and interlayer spacing and solvent mass transfer behavior are regulated and controlled by means of stable combination of the organic metal and the MXene, so that separation performance and swelling resistance are remarkably improved, and the technical problems that a traditional MXene membrane material is large in swelling and mass transfer resistance, low in separation efficiency and the like are solved.

The invention discloses a hydrophobic carbon-based monatomic catalyst and a preparation method thereof. The hydrophobic carbon-based monatomic catalyst comprises a carbon skeleton of a core-shell structure, a metal monatomic active site fixed on the carbon skeleton by forming a coordinate bond with N on the carbon skeleton, and an alkyl chain grafted on the carbon skeleton through a covalent bond. The alkyl chain is grafted through the covalent bond, chemical stable regulation and control of the hydrophobicity of the carbon-based nickel monatomic catalyst are achieved, covalent bond modification avoids the defects of a physical method, long-term stability of hydrophobicity is ensured, and efficient hydrophobic modification is achieved on the premise that monatomic sites are not damaged; a stable three-phase interface is formed on the hydrophobic surface, physical enrichment of CO2 near the catalyst is promoted, mass transfer resistance is reduced, CO2 diffusion is further accelerated through the hollow structure of the carbon skeleton, and the mass transfer capacity is improved.

The invention discloses an anion exchange membrane electrode and a preparation method and application thereof, and belongs to the technical field of new energy material and catalytic electrode preparation, the method comprises the following steps: S1, preparing an anode catalyst slurry comprising a hydrophobic covalent organic framework material, an anode catalyst, an anion exchange ionomer and a solvent; s2, preparing a cathode catalyst slurry of which the components comprise a cathode catalyst, an anion exchange ionomer and a solvent; and S3, respectively spraying or coating the anode catalyst slurry and the cathode catalyst slurry on two side surfaces of an anion exchange membrane or a gas diffusion layer, and carrying out heat treatment to obtain the anion exchange membrane electrode. The method provided by the invention can solve the problems of large gas-liquid-ion three-phase mass transfer resistance, easy shielding of active catalytic sites by ionomers and unbalanced water management in the membrane electrode assembly in the existing AEMWE device.

The invention discloses a three-dimensional porous sulfur-doped tin-antimony-nickel electrode and a preparation method and application thereof.The specific operation process includes the steps that a carrier is pretreated, the titanium carrier is used as a substrate, a sulfur-containing surfactant and tin-antimony-nickel metal salt are used as precursors, absolute ethyl alcohol and hydrochloric acid are used as solvents, and the three-dimensional porous sulfur-doped tin-antimony-nickel electrode is obtained; loading a sulfur-containing nanoparticle precursor material on the surface of the titanium carrier through a hydrothermal method; and drying the hydrothermal precursor material, and roasting in a muffle furnace to finally obtain the three-dimensional porous sulfur-doped tin-antimony-nickel-titanium substrate electrode. The catalyst disclosed by the invention has a three-dimensional porous spherical structure, the active specific surface area is obviously increased, the path of diffusing reactants to active sites is effectively shortened, the mass transfer resistance is reduced, the transfer of electrons and protons is promoted, and the reaction performance is improved. Sulfur doping not only improves the electrochemical reaction rate, conductivity and stability, but also shows high activity and high Faraday efficiency in electrocatalytic ozone production and chlorine evolution reactions.

The invention discloses an integrated gas diffusion layer with a hydrophilic and hydrophobic structure and a preparation method and application thereof, and belongs to the technical field of fuel cells. The integrated gas diffusion layer structure comprises a hydrophilic layer and a hydrophobic layer, the hydrophilic layer is a planar layer, the hydrophobic layer is a mixed layer with ridges I and grooves I, no transition layer exists between the hydrophilic layer and the hydrophobic layer, the hydrophilic layer is located between the hydrophobic layer and a fuel cell membrane electrode catalyst layer, and the hydrophobic layer is located between a fuel cell bipolar plate and the hydrophilic layer. The preparation method of the integrated gas diffusion layer comprises the following steps: sequentially blade-coating hydrophobic layer slurry and hydrophilic layer slurry into a mold with a ridge II and a groove II, and finally demolding to obtain the integrated gas diffusion layer. The integrated gas diffusion layer is used for the gas diffusion layer of the proton exchange membrane fuel cell, the hydrophobic layer has a larger contact angle, gas transmission and discharge of generated water are facilitated, the hydrophilic layer separates out the water through capillary action, the mass transfer resistance is reduced, and the performance of a membrane electrode is improved.

The invention relates to a flat tube type SOFC anode with gradient pores and a preparation method of the flat tube type SOFC anode, and belongs to the technical field of solid oxide fuel cells. Comprising an anode substrate, an anode diffusion layer and an anode functional layer which are sequentially arranged from bottom to top, wherein fuel pore channels with pore diameters of 1-1.5 mm are uniformly distributed on the anode substrate; the porosity of each layer of structure is different, so that a gradient pore anode structure is formed; the problem of low discharge power caused by too large gas mass transfer resistance due to too low porosity in a flat tube type solid oxide fuel cell due to single porosity is solved. In the preparation process, in order to better compound the three layers of anodes, a multi-platform-slow sintering procedure is adopted, and finally, the three-layer anode structure with gradient pores is successfully prepared.

The invention discloses a fly ash washing dechlorination and resource utilization method. The method comprises the steps of fly ash pretreatment, size mixing treatment, enhanced washing and solid-liquid separation, filter cake treatment and mixed washing liquid purification and salt separation crystallization. Through a multi-dimensional synergistic strengthening means, the fly ash dechlorination efficiency is remarkably improved, resource utilization is achieved, the sodium citrate and lauryl sodium sulfate composite additive is adopted, Zeta potential real-time monitoring and pulse type supplementing are combined, fly ash particles are effectively dispersed, mass transfer resistance is destroyed, dissolution of chloride ions is promoted, and the dechlorination effect of the fly ash is improved. Moreover, gradient heating, electric field assistance and redox potential regulation are introduced, so that heavy metal dissolution is inhibited while efficient dechlorination is performed.

The invention provides a membrane electrode, a fuel cell and a method for measuring a mass transfer diffusion coefficient of gas in a catalytic layer of the fuel cell, relates to the technical field of cells, and aims to solve the problem of low precision of mass transfer resistance of the gas in the catalytic layer in the fuel cell. The membrane electrode comprises a proton exchange membrane and a first catalyst layer arranged on the surface of one side of the proton exchange membrane; the first catalytic layer comprises a first catalytic sub-layer and a second catalytic sub-layer, and the first catalytic sub-layer is located between the proton exchange membrane and the second catalytic sub-layer; wherein the type of the catalyst in the first catalytic sub-layer is the same as that of the catalyst in the second catalytic sub-layer, but the catalyst in the second catalytic sub-layer is an inactivated catalyst; according to the membrane electrode, the inactivated catalyst is adopted, so that the reconstructed second catalytic sublayer is closer to the first catalytic sublayer in structure, the mass transfer resistance of gas in the membrane electrode can be reflected more truly, and the measured gas mass transfer diffusion coefficient is more accurate.

The invention discloses a carbon-coated platinum-based catalyst for a fuel cell and a preparation method thereof, and the preparation method comprises the following steps: dispersing a carbon carrier and a surfactant in a water-alcohol solution to obtain a carbon carrier solution; preparing a platinum-containing precursor solution; the mass of platinum in the platinum-containing precursor is 30-70% of the mass of the carbon carrier; mixing the carbon carrier solution and the platinum-containing precursor solution, and removing the solvent to obtain platinum-loaded carbon carrier particles; immersing the platinum-loaded carbon carrier particles into a weakly alkaline buffer solution, and adding dopamine hydrochloride to form polydopamine to coat the surfaces of the platinum-loaded carbon carrier particles; the reaction product is placed in reducing gas for carbonization treatment, and the carbon-coated platinum-based catalyst is obtained. According to the prepared catalyst, the poisoning effect of sulfonic acid groups of ionomers on Pt is avoided, the problem of large oxygen mass transfer resistance is solved, and stable electric energy output provided by a fuel cell is facilitated.

This application provides a method for preparing ferrocoke using zinc-containing dust and lean coal, belonging to the fields of iron and steel metallurgy and low-carbon ironmaking technology. The method uses zinc-containing dust and lean coal as raw materials, adding 10% medium-temperature coal tar pitch as a binder by weight of the total ferrocoke. During the ferrocoke preparation process, the metallic elements and their oxides in the zinc-containing dust can promote the reaction between carbon and CO2 at high temperatures, making carbon more easily consumed. Simultaneously, Zn volatilizes and migrates under high-temperature reducing conditions, making the local carbon structure loose and gradually forming interconnected pore structures around the dust particles. These pores facilitate the entry of CO2 gas into the ferrocoke to participate in the reaction, while also helping the generated gas to be discharged in a timely manner, thereby reducing mass transfer resistance. Through this effect, not only is the gasification reaction process accelerated, but the overall reaction performance of the ferrocoke is also improved, giving it higher gasification efficiency, making it suitable for blast furnaces, reducing the coke ratio, and improving smelting efficiency.

The invention discloses a battery pole piece baking parameter prediction method, electronic equipment and a storage medium, and relates to the technical field of lithium ion battery manufacturing. The method comprises the following steps: S1, acquiring wind field data based on oven CFD simulation and processing the wind field data into convective heat transfer and mass transfer boundary conditions; s2, calculating a pole piece temperature field and residual solvent content by using a heat and mass transfer resistance model and an energy equation; s3, judging the fluidity of the slurry according to the solvent content: solving a momentum equation considering gravity, wind shear force and surface tension when the content is high, and calculating capillary seepage of the porous medium when the content is low; and S4, explicit iterative calculation is carried out until a pole piece parameter estimated value is output. According to the method, the problem of macroscopic and microscopic scale coupling calculation is avoided through step-by-step decoupling, and the dynamic drying process of the slurry can be accurately reflected.

The reactor comprises a reaction cylinder, four groups of supporting columns are fixedly connected to the top of the reaction cylinder, a liquid storage barrel is fixedly connected to the top ends of the four groups of supporting columns, and a liquid outlet pipe is fixedly communicated with the bottom of the liquid storage barrel. Through cooperative use of the reaction cylinder, the supporting column, the liquid storage barrel, the liquid outlet pipe, the liquid inlet pipe and the power assembly, methanol in the liquid storage barrel can be quantitatively extracted through the power assembly and then discharged into the reaction cylinder through the liquid inlet pipe, so that the effect of quantitatively and accurately adding methanol is achieved, and the production efficiency and purity of formaldehyde are improved; methanol and a catalyst can be uniformly mixed in the reaction cylinder through the arranged stirring assembly, so that methanol molecules are in full contact with active sites of the catalyst, the reaction rate is increased, the formaldehyde generation efficiency is improved, the mass transfer resistance in the reaction process is favorably reduced through uniform mixing, and the reaction is quicker and more efficient.

The utility model relates to the field of cleaning brush, concretely relates to a centrifugal cleaning machine of cleaning brush, is equipped with cleaning room, is equipped with the drive end and water pass end who set up oppositely in the cleaning room, and the both ends of cleaning brush product can be engaged with the drive end and water pass end, and the water flow enters the product inside from the water pass end, and the water flow is thrown to the product outside and flows out through centrifugal rotation mode. Compared with the prior art, the application promotes the water flow to penetrate the complex three-dimensional pore of the sponge body by means of centrifugal force, breaks the mass transfer resistance limit of traditional water washing, realizes the thorough removal of internal residual starch particles, and guarantees cleaning uniformity and thoroughness.

The application discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, and the preparation method comprises the following steps: firstly, a nickel source, a molybdenum source and an aluminum source are smelted and crushed to obtain a Ni-Mo-Al ternary alloy powder; then, the Ni-Mo-Al ternary alloy powder is added into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to perform a dealuminization reaction; hydrogen bubbles generated in-situ by the reaction are used as soft templates, and the hydrophobic conductive micro powder is adsorbed on the bubble interface and assembled in the skeleton through Pickering effect; finally, the catalyst is obtained through washing and drying; the catalyst prepared by the application has a large pore structure with conductive micro powder distributed on the inner wall; the unique structure not only reduces the mass transfer resistance, constructs an electron transmission channel, but also promotes the discharge of product nitrogen through a local hydrophobic environment, and significantly improves the catalytic activity and nitrogen selectivity when treating nitrate-containing wastewater.

The invention provides anion resin containing a polyphenylalkane structure and a preparation method and application of the anion resin, and the anion resin containing the polyphenylalkane structure has a structure as shown in a formula I. According to the anion resin containing the polyphenylalkane structure and the preparation method and application of the anion resin containing the polyphenylalkane structure, a proper proportion of flexible chain segments are introduced into the resin, so that the stacking density of polymer chains can be reduced, and the chain spacing is increased; the polyphenylalkane structure-containing anion resin has the beneficial effects that the polyphenylalkane structure-containing anion resin has good toughness and excellent electrochemical performance when being applied to an electrolytic bath, the polyphenylalkane structure-containing anion resin can be used for regulating and controlling the hydrophilicity of a polymer and reducing the interface resistance of the electrolytic bath, and the polyphenylalkane structure-containing anion resin can be applied to the electrolytic bath.

The application discloses a composite material, an electrode loaded with the composite material and a preparation method. The application relates to the technical field of fluorine ion removal. The composite material comprises cerium oxide and carbon nanotubes coated on the cerium oxide. In the composite material, the cerium oxide has unique affinity to F ions, but the F removal capacity and kinetics of the cerium oxide are not satisfactory due to the limited conductivity. Therefore, the application develops a composite material, in which a structure of carbon nanotubes (CNT) tightly wrapping cerium oxide (CeO2) particles is formed, so that the conductivity of the material is greatly improved and the mass transfer resistance in the electric adsorption and desorption of fluorine ions is weakened.

The utility model relates to water electrolysis technical field, specifically disclose a kind of low-temperature full gaseous water vapor electrolytic hydrogen production device and system. The utility model aims at overcoming the limitations of existing water electrolysis technology in energy efficiency, cost, system complexity, operation flexibility and environmental adaptability etc. The utility model is core at, under the mild condition lower than 90 DEG C, water is supplied to cathode and anode of electrolytic cell in the form of pure gaseous water vapor simultaneously, using specially designed membrane electrode assembly and internal water management structure, under the action of direct current, water vapor is decomposed efficiently to generate high-purity hydrogen and oxygen. The entire electrolysis process avoids the direct input and circulation of liquid water, realizes gas-solid two-phase interface reaction, significantly simplifies water balance system, reduces equipment volume and weight, solves the bubble coverage of traditional liquid phase electrolysis, mass transfer resistance. The utility model device has the characteristics of modularization and miniaturization, and significantly reduces the net power consumption per unit hydrogen production.

The application discloses an ordered carbon fiber paper and a preparation method and application thereof in a fuel cell / water electrolysis diffusion layer, and belongs to the technical field of hydrogen energy material. The method comprises the following steps: preparing carbon fiber non-woven cloth, a carbon fiber web and a resin system; alternately stacking the non-woven cloth and the web in sequence to form a stacking structure with a preset number of layers; performing needle punching or water jetting consolidation on the stacking structure to prepare a carbon fiber raw paper; impregnating the raw paper with resin, and performing hot-pressing curing to obtain a precursor; and performing carbonization and graphitization treatment on the precursor in an inert atmosphere to obtain the ordered carbon fiber paper. The non-woven cloth is used to realize directional and ordered arrangement of carbon fibers in the X-Y plane of the carbon paper, the needle punching / water jetting process is used to introduce Z-direction through fibers, and a three-dimensional ordered fiber and pore network are constructed, so that the defects of large mass transfer resistance, poor Z-direction conductivity, insufficient rigidity, low interlayer strength and the like of the traditional carbon paper are solved, and the in-plane air permeability, Z-direction conductivity and mechanical properties of the carbon paper are significantly improved.

The invention discloses a total heat exchange membrane and a preparation method thereof, the total heat exchange membrane comprises: a compact layer, the compact layer comprises a hydrophilic polymer substrate and an MXene functional filler, the hydrophilic polymer substrate comprises one or more of polyvinyl alcohol, polyvinylpyrrolidone, polyurethane and polyacrylic resin; the MXene functional filler is an MXene material subjected to antibacterial modification treatment; the porous support layer is coated with the compact layer, and the porous support layer is prepared from a polymer membrane material subjected to hydrophobic modification treatment. The total heat exchange membrane comprises a compact layer and a porous supporting layer, and the compact layer comprises a hydrophilic polymer base material and antibacterial modified MXene functional filler, so that high moisture permeability and antibacterial property of the total heat exchange membrane can be realized; the porous supporting layer is prepared from a polymer film subjected to hydrophobic modification treatment, has hydrophobicity, reduces adhesion of water molecules, and can reduce mass transfer resistance.

The invention relates to a supported TEMPO catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. In order to solve the problem of low mass transfer efficiency of the supported TEMPO catalyst, quaternary ammonium salt is used as an active component, a functionalized molecular sieve is used as a carrier, and the loading capacity of TEMPO is 0.2-0.8 mmol / g. Halogen is introduced to the surface of the molecular sieve as an active functional group by adopting a silane coupling agent, so that the overall stability of the catalyst is enhanced, the pore structure of a molecular sieve carrier is optimized, the mass transfer resistance is reduced, and the mass transfer efficiency is improved. According to the invention, the quaternary ammonium salt is introduced into the supported TEMPO catalyst, so that the mass transfer efficiency of the supported TEMPO catalyst in an Anli oxidation system is effectively improved, and the catalytic activity of the supported TEMPO catalyst is improved. The supported TEMPO catalyst disclosed by the invention has relatively strong solvent resistance, cycling stability, high catalytic activity and high selectivity, and can be recycled.

The invention discloses a method for preparing a porous titanium-based material with low mass transfer resistance by using magnetic field induction, and relates to the technical field of electrode manufacturing, and the method comprises the following steps: preparing titanium powder slurry containing magnetic components and titanium powder slurry without magnetic components, and preparing a double-layer or multi-layer composite structure from different slurries; directionally arranging the magnetic components by using a magnetic field; the sintering treatment enables the magnetic components to be decomposed or sintered to generate a directionally-arranged supporting structure, and the directionally-arranged supporting structure is obtained; and continuously sintering at the temperature higher than the first temperature interval, and pickling to remove the directionally arranged support structure to obtain the porous titanium-based material with the dual-scale pore structure, the problems that in the prior art, mass transfer efficiency is low, mass transfer resistance is large, a directional through pore structure is difficult to achieve, cooperative construction of pores with different pore diameters is difficult, the functionality of the pores is single, and the pores are prone to being polluted are solved.

The invention provides an anionic membrane AEM electrolytic bath with an asymmetric structure, and belongs to the field of structural design of alkaline membrane electrolytic baths. The anode side of the electrolytic cell adopts a rigid net as a gas diffusion layer, and the cathode side adopts an elastic net as a gas diffusion layer. According to the electrolytic cell, the asymmetric rigid net and the elastic net are adopted as gas diffusion layers, and a groove flow channel structure is omitted, so that on one hand, the porosity in the electrolytic cell can be increased, a larger flow channel area is provided, the gas-liquid two-phase fluid mass transfer resistance is reduced while the contact area of an electrode of the electrolytic cell and liquid is increased, and bubble discharge is facilitated; the processing and assembling difficulty is reduced; on the other hand, due to the existence of the cathode side elastic net, the assembly reliability can be improved, the sealing problem is solved, the membrane electrode and the bipolar plate are in full contact, the hydrogen bubble generation position is uniform, and the contact resistance is reduced; finally, the rigid net on the anode side can serve as a supporting part and provide larger porosity, and mass transfer resistance is further reduced.

The invention discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, the preparation method comprises the following steps: firstly, smelting and crushing a nickel source, a molybdenum source and an aluminum source to obtain Ni-Mo-Al ternary alloy powder; then adding into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to carry out dealumination reaction; hydrogen bubbles generated in situ in a reaction are used as a soft template, and hydrophobic conductive micro powder is adsorbed on a bubble interface and assembled in a skeleton through a Pickering effect; and finally washing and drying to obtain the catalyst. The prepared catalyst has a macroporous structure with conductive micro powder distributed on the inner wall, the unique structure not only reduces mass transfer resistance and constructs an electron transport channel, but also promotes discharge of a product nitrogen through a local hydrophobic environment, and the catalytic activity and nitrogen selectivity during treatment of nitrate-containing wastewater are remarkably improved.