180 results about "Microwave assisted" patented technology

The invention relates to a textured KCu7S4 thermoelectric material and a preparation method thereof, and the method comprises the steps: sequentially adding a prepared KOH aqueous solution, CuCl2. 2H2O and Na2S. 9H2O into a high-pressure kettle, and fully stirring for dissolving; dropwise adding an N2H4.H2O aqueous solution into the mixed solution, fully stirring, sealing, transferring to a microwave chemical synthesis instrument, heating, keeping stirring, and reacting at a target temperature and self-generated pressure to generate a KCu7S4 nanowire preferentially growing along a [001] crystal orientation; and after the reaction is finished and natural cooling is carried out, a product is collected through centrifugation, full cleaning and vacuum drying are carried out, and then the KCu7S4 thermoelectric material with [001] preferred orientation in the direction perpendicular to the pressure direction is obtained through spark plasma sintering. According to the method, a surfactant and an organic solvent are not used, and macro, rapid, efficient and controllable preparation of the KCu7S4 nanowire is realized through a low-temperature, low-cost and low-energy-consumption microwave-assisted hydrothermal process.

The invention discloses a preparation method and application of a wind cap of a circulating fluidized bed gasifier, the wind cap is arranged at the bottom of a gasifier body, the wind cap mainly comprises a wind cap gas inlet, a wind cap gas outlet and a wind cap gas flow channel, and the wind cap gas flow channel is composed of a Tesla valve fluid channel. The air cap is prepared from modified fly ash through a combined method of freezing ball-milling nano modification, 3D printing coupling microwave-assisted sintering and salt bath chromizing strengthening. According to the method, a large amount of solid waste of fly ash can be consumed to realize carbon emission reduction, the efficiency of the circulating fluidized bed can be improved through structural optimization, meanwhile, the preparation cost of the hood can be reduced, and the method has relatively high application and popularization values.

The utility model discloses a kind of plant fiber tableware microwave auxiliary drying setting device, it is related to tableware drying technical field.The utility model includes drying cabinet main body, drying cabinet main body front is equipped with controller, further includes: conveying mechanism, the conveying mechanism is arranged in the inside of drying cabinet main body, the conveying mechanism includes two fixedly connected in the inside of drying cabinet main body conveying seat, two the side of mutually approaching of conveying seat is all provided with chain, and the conveying seat in front is fixedly connected with motor front.The utility model is by being provided with conveying mechanism, specifically in the process of drying, since conveying mechanism is the chain mode transmission, and the space between fixed link is larger, and hollow groove is set between placing mould, to increase the flowability of air, improve drying effect, make the bottom of tableware also better be dried, reduce the situation of jamming, improve the setting effect of plant fiber.

The application discloses a kind of bifunctional catalyst and its application in microwave-assisted preparation of biodiesel, belong to catalysis technical field.The application introduces cobalt metal in ZIF-8 skeleton, when MOFs derivative is prepared by calcination, the introduction of transition metal can construct magnetic center, adjust the magnetic loss ability of derivative material, so that the prepared catalyst has strong wave-absorbing performance under 2.45GHz industrial microwave field, can effectively absorb microwave energy and convert it into heat energy, thereby improving the energy utilization efficiency of reaction system, and finally improving the catalytic performance of catalyst, further improve the preparation efficiency of microwave-assisted biodiesel, and has good application value and prospect in catalysis technical field.

The utility model relates to the technical field of ceramic sintering, and discloses a low-temperature fast-firing conductive ceramic microwave-assisted sintering device which comprises a microwave sintering furnace and a furnace chamber arranged on the microwave sintering furnace, the furnace chamber comprises a sintering chamber, a placing frame is connected in the furnace chamber in a sliding mode, and the placing frame comprises placing plates and sealing plates which are fixed alternately. The sealing plate is used for shielding the furnace chamber; the placing frame is arranged in the furnace chamber of the microwave sintering furnace, the placing frame is formed by alternately fixing the placing plates and the sealing plates, a plurality of conductive ceramics can be placed on the placing plates, the placing frame is moved to enable the conductive ceramics to sequentially enter the sintering chamber of the furnace chamber to be sintered, and the conductive ceramics are directly moved out after being sintered. The efficient sintering of the conductive ceramic is realized by adopting a reciprocating translation mode, the conductive ceramic is convenient to take, and the sintered conductive ceramic is still sintered when the sintered conductive ceramic is taken, so that the sintering efficiency is improved, and the phenomena of heat dissipation and energy waste caused by repeatedly opening the furnace chamber are avoided.

The invention relates to a method for preparing formic acid by wrapping tin sulfide (SnSx) with graphene oxide (GO) to improve reduction of carbon dioxide (CO2) through electro-catalysis, in particular to an efficient electro-catalysis carbon dioxide reduction system synthesized by wrapping the surface of SnSx with GO through a microwave-assisted method, and belongs to the technical field of catalytic energy. Amorphous SnSx nanoparticles are synthesized by adopting a solution method, and the surface of SnSx is coated with GO nanosheets by adopting a microwave-assisted method to form the SnSx / GO composite material. GO wrapping effectively inhibits crystallization growth of SnSx and loss of sulfur atoms in the electrochemical reduction process, and meanwhile GO is reduced into rGO in situ to optimize mass transfer. In a flow cell, the catalyst achieves a high current density of 126.25 + / -0.78 mA cm <-2 > and a formic acid Faraday efficiency (FE) of 99.9 + / -1.1%. The smooth implementation of the patent provides an efficient strategy for regulating and controlling the efficiency of reducing carbon dioxide into formic acid through electro-catalysis, solves the problem of unstable system structure in the prior art, and provides greater possibility for industrialization in the field of electro-catalysis carbon dioxide reduction.

The embodiment of the invention relates to a laser metal additive manufacturing method based on dynamic microwave assistance, and the method comprises the following steps: S1, determining technological parameters of laser additive manufacturing, and determining the size of a preset molten pool based on the technological parameters; s2, a laser beam is controlled to act on the metal material to form a liquid molten pool, meanwhile, a multi-stage microwave screening device is used for conducting spatial constraint and screening on microwave beams, and the acting range of the microwave beams is focused to the size matched with the preset molten pool size; s3, directionally applying the screened microwave beams to a liquid molten pool and a solid-liquid interface area; and S4, the screened microwave beams and the laser beams are controlled to move synchronously, and the laser beams are matched to conduct layer-by-layer stacking of materials so as to complete part forming. By realizing localization, special shape and dynamic regulation and control of a microwave energy field, inherent defects of laser are compensated from the perspective of a thermal field, and metallurgical defects are improved from the perspective of microdynamics. The invention further provides a laser metal additive manufacturing device based on dynamic microwave assistance.

The invention discloses a qualitative and quantitative detection method for graphene in a fiber fabric based on microwave assistance, and relates to the technical field of nano material analysis and detection. The qualitative and quantitative detection method comprises the following steps: adding a solvent and a dispersing agent into a fiber fabric sample, carrying out microwave-assisted dissolution treatment, adding the obtained mixture into a microwave-vortex ultrasonic-centrifugal integrated treatment system, and carrying out vortex dispersion, ultrasonic stripping and gradient centrifugal separation to obtain enriched graphene precipitate; the graphene precipitate is uniformly mixed with an internal standard substance silicon carbide, Raman spectroscopy is adopted for testing, qualitative analysis is carried out by analyzing the characteristics of a G peak and a 2D peak, and quantitative calculation is carried out on graphene according to the intensity ratio of a D peak to a silicon carbide characteristic peak. The method is efficient and accurate, and effectively solves the problems of low treatment efficiency, high cost, environmental pollution, easy damage of graphene structure and insufficient quantitative analysis precision of a traditional method.

The application discloses a cement-chemicals co-production system and a control method thereof, and belongs to the technical field of carbon emission reduction and resource utilization in the cement industry. The system comprises a water electrolysis hydrogen production unit, a microwave-assisted hydrogen calcination unit, a cement clinker sintering unit, a synthetic gas purification unit, a synthetic gas proportioning unit, a chemical synthesis unit, a waste heat recovery unit and an automatic control and data monitoring unit. The microwave-assisted hydrogen calcination technology is used to decompose calcium carbonate into CO synthesis gas, oxygen by-product of water electrolysis is used for oxygen-enriched combustion, combined with accurate proportioning of synthetic gas and DCS and artificial intelligence collaborative control, the collaborative production of cement clinker and high-value chemicals is realized. The application reduces the carbon emission of the system by more than 70% compared with the traditional process, reduces the comprehensive energy consumption by more than 30%, the thermal efficiency is greater than or equal to 85%, the synthetic gas conversion rate is greater than or equal to 80%, and the carbon resource utilization rate and production stability are significantly improved, and the application has outstanding economic and environmental benefits.

This invention discloses a method for determining the content and simultaneously identifying the source of polyglutamic acid (PCA) in fertilizers based on microwave digestion-high-resolution liquid chromatography-mass spectrometry (LC-MS), belonging to the field of analytical detection technology. The method includes: microwave-assisted acid hydrolysis of fertilizer samples to obtain a hydrolysate; injecting the hydrolysate into a liquid chromatography-high-resolution mass spectrometry (LC-MS) instrument, performing a single injection analysis in data-independent acquisition (DIA) mode, and simultaneously acquiring a mass spectrometry dataset containing a full-scan fingerprint of the parent ion and fragment information of the daughter ion by alternating between low and high collision energies; extracting the precise mass number of PCA from the dataset for accurate quantification, and calculating the PCA content using the difference method; simultaneously retrieving the total ion chromatogram and inferring the source of PCA based on the response of other amino acids. This invention is the first to introduce microwave digestion pretreatment and high-resolution mass spectrometry DIA acquisition mode into the field of PCA detection in fertilizers, requiring only a single injection to simultaneously complete accurate quantification and source identification, effectively avoiding false positives caused by background of plant and animal protein hydrolysates, and significantly improving the efficiency and confidence of PCA detection in complex matrix fertilizers.

The invention relates to the technical field of preparation of alloy electrocatalysts, in particular to a method for preparing an alloy electrocatalyst by a rotary microwave-assisted method, which comprises the following steps: stirring and mixing carbon powder, cobalt chloride, deionized water and absolute ethyl alcohol, adding ammonia water, ultrasonically dispersing, filtering and collecting a filter cake, and drying to obtain the alloy electrocatalyst. Drying, heating, introducing hydrogen, carrying out heat preservation treatment, and collecting to obtain a precursor; taking the precursor, adding ethylene glycol, a sodium hydroxide solution, chloroplatinic acid and deionized water, carrying out ultrasonic-assisted treatment, collecting to obtain a mixed solution, placing the mixed solution in a sealed reaction device, and carrying out rotary microwave treatment; and carrying out pressure treatment, filtering, taking a filter cake, drying, heating, carrying out heat preservation and annealing treatment, collecting an annealed material, carrying out acid pickling treatment, and drying. The synergistic effect of the rotating microwaves ensures that the materials are uniformly heated, the particle aggregation phenomenon is reduced, a foundation is laid for the high activity and durability of the catalyst, and the method is more suitable for industrial large-scale production.

This invention discloses a method for preparing ZSM-5 molecular sieves using a microwave-assisted method with desilication solution, comprising the following steps: First, pretreatment of the desilication solution: the desilication solution is mixed with an oxyacid to adjust the pH to 9-11.5, a template agent is added and mixed evenly to obtain an initial gel; Second, preparation of the ZSM-5 molecular sieve: the initial gel obtained in the first step is placed in a microwave synthesizer for aging with high-speed stirring; the aged solution undergoes a crystallization reaction, followed by filtration, washing, drying, and high-temperature calcination to obtain the ZSM-5 molecular sieve. This invention uses desilication solution as a raw material to prepare ZSM-5 molecular sieves, saving material costs and providing a new approach for the high-value utilization of desilication solution. Furthermore, by utilizing microwave-assisted synthesis on the basis of the traditional hydrothermal method, the time cost is effectively shortened.

The application relates to the technical field of preparation of lithium ion battery negative electrode materials, in particular to a graphene-coated silicon-carbon composite material and a preparation method and application thereof. The preparation method of the graphene-coated silicon-carbon composite material comprises the following steps: microwave-assisted sand milling mixing of a nano-silicon dispersion liquid, a pitch dispersion liquid, a three-block copolymer Pluronic F127 and zirconium oxide beads to obtain a mixed solution of pitch silicon particles; microwave-assisted sand milling dispersion of a sulfonated graphene dispersion liquid into the mixed solution of pitch silicon particles to obtain a slurry of sulfonated graphene-coated pitch silicon particles; and drying and heat treatment of the slurry of sulfonated graphene-coated pitch silicon particles to obtain the graphene-coated silicon-carbon composite material. The graphene prepared by the preparation method effectively buffers the volume effect generated in the lithium intercalation and deintercalation process of the silicon-based negative electrode material, so that the electrochemical performance of the material is improved.

The invention relates to the technical field of proteolysis, in particular to a microwave-assisted proteolysis device which comprises a sample tray arranged on the inner side of a box body, and the sample tray comprises an upper tray arranged on the inner side of the box body and a lower tray fixed to the bottom of the upper tray. A positioning assembly for synchronously clamping the plurality of enzymolysis tanks and keeping the enzymolysis tanks stable is arranged on the sample tray, and the positioning assembly comprises a plurality of first annular discs arranged on the upper tray and a plurality of second annular discs arranged on the lower tray. The stability of each enzymolysis tank during enzymolysis is ensured, non-uniform microwave heating caused by lateral inclination of the enzymolysis tanks is avoided, the reaction consistency in the enzymolysis process is improved, the proteolysis effect is enhanced, meanwhile, the stable digestion tank position can ensure that each sample reacts under the same condition, and the enzymolysis accuracy is improved. The experimental error caused by non-uniform heating of the sample is reduced, the reliability and the accuracy of the experimental result are improved, and the application range of the enzymolysis device is expanded.

The invention discloses a modified aramid composite material and a preparation method thereof, and relates to the technical field of aramid composite material production, and the modified aramid composite material is prepared from aramid fibers, a resin matrix, an interface enhancement layer, a weather-resistant-flame-retardant synergistic system and a functional auxiliary agent; according to the preparation method, plasma activation and microwave-assisted in-situ grafting are combined, the limitation of a traditional single interface modification technology is broken through, the interlayer bonding strength and fatigue resistance of the composite material are remarkably improved, a multi-element compounding technology of the hindered amine light stabilizer, the hindered phenol antioxidant and the nanofiller is adopted, and the composite material is prepared. According to the present invention, the integrated improvement of the weather resistance and the flame retardant property of the material is achieved through the intermolecular synergistic effect, and the space customization of the mechanical property and the functional characteristic of the composite material is achieved through the combination of the 3D printing technology and the magnetic field orientation curing, such that the impact resistance and the size stability of the composite material under the complex working condition achieve the collaborative optimization.

The present invention relates to a method for synthesizing oligo- and polysaccharides using microwave radiation, in particular to a method and a device for automated synthesis of oligo- and polysaccharides.

The invention discloses a foamed nickel loaded (NiO) 0.75 (MnO) 0.25 porous nanosheet solid solution electrode material and a preparation method and application thereof, relates to the field of material science, nanotechnology and new energy, and utilizes in-situ diffusion and lattice reconstruction of a NiO / Mn3O4 heterojunction obtained by microwave-assisted hydrothermal treatment in a medium-high temperature heat treatment process under specific conditions to prepare a porous nanosheet solid solution electrode material. According to the preparation method, a two-dimensional nanosheet array structure which is uniformly arranged and mutually connected can be induced and converted into a (NiO) 0.75 (MnO) 0.25 porous nanosheet solid solution with a highly porous and uniformly arranged and connected two-dimensional nanosheet array structure, so that the electrochemical accessible surface area is effectively increased, and the charge transfer kinetics is accelerated; therefore, high specific capacity, wide voltage window and excellent cycle durability are shown in an alkaline-condition water system supercapacitor. The method is simple in process, good in repeatability and suitable for large-scale preparation of the high-performance alkaline aqueous supercapacitor electrode material.

The invention provides a microwave-induced CuO / SnO2 nano composite material as well as a preparation method and application thereof, belongs to the technical field of material synthesis, and is used for solving the technical problem of poor gas sensitivity of a CuO / SnO2 composite material. The preparation method of the CuO / SnO2 nano composite material comprises the following steps: dissolving and mixing a tin source in a solvent I, and carrying out chemical reaction to prepare a flat rod-shaped Sn-MOF matrix; dispersing and dissolving the Sn-MOF matrix and a copper source in a solvent II, reacting under a microwave-assisted condition, and washing and drying a product generated by induction; and calcining the dried product in the air to prepare the CuO / SnO2 nano composite material. The acetone steam sensor prepared from the CuO / SnO2 nano composite material has good gas sensing performance. The optimal detection working temperature of the sensor to acetone steam is 200 DEG C, and meanwhile, the sensor also has the advantages of high reaction and response speed, large response value, good long-term stability and the like.

The utility model relates to the technical field of decorative paper drying, in particular to decorative paper gum dipping and drying equipment which comprises a shell, a hot air circulation mechanism is arranged in the shell and comprises an air injection cylinder, and a recovery air cylinder is fixedly arranged on the outer side of the air injection cylinder through an air injection pipe; a second arc-shaped recovery baffle is fixedly arranged on one side of the recovery tank, and a first arc-shaped recovery baffle is fixedly arranged on one side, corresponding to the air spraying pipe, of the surface of the recovery air cylinder; and through the synergistic effect of the hot air circulation mechanism and the microwave emitter array, rapid drying of the decorative paper is achieved. The hot air circulating system can efficiently utilize hot air and reduce heat waste, meanwhile, microwave-assisted drying can further accelerate evaporation of moisture, the drying time is remarkably shortened, and the production efficiency is improved.

The present embodiments relate to a pre-assisting microwave assisted magnetic recording (MAMR) (PA-MAMR) write-head structure where the STO is disposed within a leading shield (LS). The STO can be used to pump energy into the media before the writing process. The STO can also pre-excite the media and let the media oscillation damp over the time and then switch under the writer field. The present embodiments can be easier to increase the magnetic volume and magnetic moment of the free layer, while also achieving a greater oscillation frequency with magnetization oscillations around the axis in the film plane.

A SCALABLE MICROWAVE-ASSISTED CONTINUOUS FLOW METHOD FOR SYNTHESIS OF PLATINUM ON CARBON CATALYST AND A SYSTEM THEREOF The present invention relates to a microwave-assisted continuous flow process for synthesis of platinum on carbon catalyst with shorter residence times and providing a high throughput. Further, the present invention relates to a microwave-assisted continuous flow system comprising two or more continuous stirred tank reactors (2 and 3) connected in series and placed in a microwave oven (6) for synthesizing platinum on carbon (Pt / C). Ref. Figure 1

The application relates to a high gravity-microwave assisted concentration device for water solution element analysis, which comprises an inner cavity, an outer cavity, a heat exchanger and a condensed liquid storage tank; a microwave generator is arranged in the inner cavity, an air inlet is arranged on the side wall, a flow guide plate is fixed on the inner side wall and can be rotated around the fixed shaft as the center, the microwave generator is arranged on the upper wall of the inner cavity and is close to the upper wall, a concentrated liquid discharge port is arranged at the bottom of the inner cavity, the outer cavity is fixed on the outer side of the inner cavity and completely wraps the inner cavity to form a sealed environment, a gap of 4cm-15cm is arranged between the outer cavity and the inner cavity, an inert gas pipeline connected with inert gas is fixed on the top of the outer cavity, and the bottom is connected with the concentrated liquid storage tank; one end of the heat exchanger is connected with the feeding port, the other end is connected with high-temperature steam of volatile liquid separated from the mixed fluid, and the bottom is connected with the condensed liquid storage tank. The device can shorten the concentration time and improve the concentration efficiency.

The invention discloses a method for extracting fish oil from viscera of freshwater fish, which comprises the following steps: removing gall bladder, swim bladder and intestinal digests in the viscera of freshwater fish, cleaning, draining, and crushing to obtain viscera paste; putting the minced viscera into deionized water, carrying out microwave treatment, then adjusting the pH value to 6.5-7.5, and then adding neutral protease and an antioxidant to carry out enzymolysis reaction, so as to obtain an enzymolysis mixture; and performing centrifugal layering on the enzymolysis mixture, collecting a fish oil layer, and performing distillation purification to obtain the fish oil. According to the extraction method disclosed by the invention, a microwave-assisted enzymolysis technology is adopted to accelerate a reaction process, an oil-soluble natural antioxidant in-situ antioxidant technology is combined to inhibit fat oxidation, and the fish oil is purified by a molecular distillation technology, so that the product quality is improved; the technology can improve the fish oil extraction efficiency, reduce the production cost, reduce the environmental pollution, and ensure the high quality and high purity of the fish oil.

The invention belongs to the technical field of lithium-sulfur battery materials, and particularly relates to a preparation method of battery-grade lithium sulfide based on microwave-assisted gas-solid phase reaction and in-situ coating. According to the preparation method, high-efficiency and low-consumption preparation of the battery-grade lithium sulfide is realized by adopting a technical path of combining gas-solid phase reaction of a microwave plasma activated sulfur source and a lithium source, adopting a supercritical fluid-assisted in-situ carbon coating process and adopting an alcohol washing-supercritical CO2 drying purification system; meanwhile, the problems of low product purity, high energy consumption, poor stability and the like in the traditional process are solved.

The application discloses a kind of bauxite catalytic microwave-assisted pyrolysis of waste and old textile resourceization method, belong to microwave-assisted catalytic pyrolysis of waste and old textile processing field.The specific steps are as follows: after washing and dewatering treatment, waste and old textile is dried, granulation;After drying bauxite, grinding and sieving;Waste and old textile and bauxite particles after granulation are treated by microwave pyrolysis;Residual solid after pyrolysis is pyrolysis carbon;After collecting gas generated in the process of pyrolysis, condensation is obtained, and incondensable pyrolysis gas and liquid pyrolysis oil are obtained;The present application utilizes bauxite as catalyst and converts waste and old textile into valuable oil, gas and carbon, realizes the maximum absorption of bauxite and waste and old textile and resource utilization.The present application has low cost, simple operation, and pyrolysis product can meet some energy utilization, so that bauxite and waste and old textile are resourceized, harmless and reduced, achieve the goal of synergistic effect of pollution reduction and carbon reduction, produce good economic benefit, social benefit and environmental benefit.

The invention discloses a cadmium sulfide quantum dot / bismuth tungstate / cadmium tungstate composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The cadmium sulfide quantum dot / bismuth tungstate / cadmium tungstate (CdSQDs / Bi2WO6 / CdWO4) composite photocatalyst which has full-spectrum photocatalytic activity and is used for degrading organic pollutants is prepared by adopting a microwave-assisted synthesis technology, and the molar ratio of cadmium sulfide quantum dots to bismuth tungstate to cadmium tungstate is 2: (2-3): (8-12). According to the cadmium sulfide quantum dot / bismuth tungstate / cadmium tungstate composite photocatalyst as well as the preparation method and application thereof, due to the introduction of the cadmium sulfide quantum dots, the light absorption range of bismuth tungstate / cadmium tungstate is widened, and the light utilization rate is increased; the cadmium sulfide quantum dots, the bismuth tungstate and the cadmium tungstate form effective heterojunctions in close contact, so that the separation efficiency of photon-generated carriers is improved, and the photocatalytic performance is effectively improved.

The application particularly relates to a harmless treatment method of nitrate wastewater based on microwave-assisted catalytic reduction, and the technical scheme is as follows: according to the mass ratio of catalyst to nitrate wastewater of 0.001-0.1:1, the catalyst is added into the nitrate wastewater to obtain a mixed solution; then 1-5wt% of a cavity scavenger in the mixed solution is added into the mixed solution, hydrochloric acid is used to adjust the pH of the mixed solution to 1-6, the mixed solution is stirred in a dark room for 1-2h to obtain a suspension I; then the suspension I is placed into a microwave reaction device, and is reacted under the microwave irradiation of 0.3-20GHz for 60-120min to obtain nitrogen gas based on the harmless treatment of the nitrate wastewater by the microwave-assisted catalytic reduction. The application has the advantages of simple operation, low cost, low energy consumption, and the prepared catalyst can be repeatedly used and easily used in large scale, the method has high conversion rate of nitrate, no secondary pollution, high selectivity of target product, and can realize the harmless removal of nitrogen.

This invention relates to the field of catalyst preparation technology, specifically disclosing a microwave-absorbing carbon-coated Fe2N catalyst, its preparation method, and its application in Fischer-Tropsch synthesis. The catalyst provided by this invention uses Fe2N particles with microwave-absorbing properties as the core, coated with an outer carbon shell, forming an Fe2N@C core-shell composite structure. The carbon coating layer can, to a certain extent, inhibit the agglomeration and sintering of Fe2N particles, improve the structural stability of the catalyst, and regulate its surface properties and active phase evolution behavior. Furthermore, the Fe2N@C composite material can absorb electromagnetic waves and convert them into heat energy, providing a material basis for heating and energy utilization in microwave-assisted Fischer-Tropsch synthesis. The preparation method of this invention is simple, and the resulting catalyst possesses both electromagnetic wave absorption and Fischer-Tropsch synthesis catalytic functions, providing a new material system for the functional design of iron-based catalysts and their application in microwave-enhanced Fischer-Tropsch synthesis.

The application relates to the technical field of solar cells, in particular to a glass powder for a back silver paste of an N-type crystalline silicon solar cell and a preparation method thereof, and specifically comprises the following steps: 1) carrying out surface pretreatment on the glass powder to obtain pretreated glass powder, then immersing the pretreated glass powder into prepared reaction liquid, and carrying out hydrothermal reaction to obtain loaded nanosheet type glass powder; 2) taking adenosine disodium triphosphate as a phosphorus source, taking calcium oleate as a precursor and a template agent, and depositing super-long nanowires on the loaded nanosheet type glass powder through a microwave-assisted hydrothermal method, and then carrying out cleaning and drying. The glass powder for the silver paste can not only make silver powder firmly adhere to the surface of a silicon substrate, improve the bonding strength between the silver powder and the silicon substrate, but also form a plurality of nanosheet layers with a dense structure in a sintered electrode, so that the sintered electrode is improved in compactness, and the photoelectric conversion rate and service life of the solar cell are improved.

This invention discloses a molecular sieve membrane with improved performance through ion exchange, its preparation method, and its applications. The preparation method includes the following steps: S1: dissolving a metal salt in a solvent to prepare a metal ion solution; S2: contacting the molecular sieve membrane with the metal ion solution and performing ion exchange under microwave-assisted solvothermal conditions; S3: washing and drying the ion-exchanged molecular sieve membrane to obtain a molecular sieve membrane with improved performance after metal ion exchange. The improved molecular sieve membrane obtained by this invention exhibits significantly enhanced permeation flux and / or selectivity. It can be used not only for organic solvent dehydration and separation but also for gas separation (such as natural gas decarbonization, pre-combustion carbon capture, and ammonia collection in ammonia synthesis). The method is simple to operate, time-saving, and low-cost, making it suitable for large-scale industrial production.