1282 results about "Muffle furnace" patented technology

The invention belongs to the technical field of CO catalytic oxidation, and particularly discloses a method for synthesizing a CuO / CeO2 catalyst through a rapid fluid mixing method and application thereof.The method comprises the steps that a copper salt solution A and a cerium salt solution B are put into a rapid fluid turbulence mixing reactor, the flow speed is controlled, a catalyst precursor is prepared after product treatment, the catalyst precursor is put into a muffle furnace, air is introduced for calcination, and the catalyst is prepared; and high selectivity and high conversion rate in CO oxidation reaction in a hydrogen-rich environment are realized. The method provided by the invention also improves the traditional MOF synthesis method, adopts water as a solvent, and reduces the synthesis conditions. The prepared catalyst has high conversion rate and selectivity, the CO conversion rate at 90 DEG C reaches 100%, and the corresponding selectivity is 100%.

The invention relates to the technical field of preparation of catalysts, in particular to a catalyst for in-situ capture of carbon dioxide, a preparation method of the catalyst and application of the catalyst to preparation of methanol from methane, and the preparation method comprises the following steps: S1, mixing and stirring Bi (NO3) 3.5 H2O, dilute nitric acid and an adsorption modifier; s2, filtering to obtain a white precipitate, drying, slowly heating to 450 DEG C in a muffle furnace, and keeping the temperature for 20-30 minutes to obtain a faint yellow solid; s3, dispersing in a modified dissolving solution, sealing the reactor, and purging with argon for 10-15 minutes; and S4, injecting CH4, reacting for 2 hours under the irradiation of a xenon lamp, washing a solid obtained by suction filtration with deionized water, and drying at 60 DEG C for 10-12 hours to obtain the high-performance catalyst. The invention aims at the field of preparation of high-value chemicals from photocatalytic methane, solves the problem of generation of carbon dioxide by peroxidation of methane, and captures the peroxidation product carbon dioxide through the cooperation of the adsorption modifier and the modified dissolving solution to inhibit peroxidation of methane.

The invention relates to a preparation method of monodisperse spherical alumina powder with uniform granularity. The preparation method comprises the following steps: dissolving and stirring an aluminum source, a precipitator and a dispersing agent in ultrapure water to prepare an aluminum oxide precursor solution; transferring the prepared aluminum oxide precursor solution into a hydrothermal reaction kettle, carrying out heating reaction, after the hydrothermal reaction is finished, naturally cooling to room temperature, alternately and respectively washing with ultrapure water and ethanol, and drying to obtain aluminum oxide precursor powder; and sintering the prepared aluminum oxide precursor powder in a muffle furnace in an air atmosphere to obtain the spherical aluminum oxide powder. The hydrothermal method is adopted to react in a high-temperature and high-pressure environment, so that the reaction uniformity is improved, and the spherical aluminum oxide precursor with uniform granularity and consistent morphology is obtained. The bending strength of the obtained ceramic material is remarkably improved, and the highest bending strength reaches 245MPa. The method has wide application prospects in the fields of heat-conducting composite materials, integrated circuit films, substrate materials, 3D printing materials, precision polishing materials and the like.

The invention relates to an iron-based catalyst for catalyzing CO2 hydrogenation to prepare low-carbon olefin and a preparation method thereof, and the preparation method comprises the following steps: preparing a zirconium oxide carrier, grinding ZrOCl2. 8H2O, calcining in a muffle furnace to obtain ZrO2, and grinding to obtain the zirconium oxide carrier; the preparation method comprises the following steps: respectively dissolving a Fe source, a Co source and a K source in water, adding the zirconia carrier, stirring and evaporating to obtain a suspension, drying the suspension, and calcining to obtain a FeCoK / ZrO2 catalyst; wherein in the FeCoK / ZrO2 catalyst, the loading capacity of Fe-Co is 12.2 wt%, the molar ratio of Co / (Fe + Co) is 0.15 to 2, and the molar ratio of K to Fe is 0.2 to 0.7. The FeCoK / ZrO2 catalyst prepared by the preparation method disclosed by the invention has a very high conversion rate on CO2 and selectivity on low-carbon olefins, optimizes the adsorption activation path on CO2, and has very good catalytic activity.

The present invention generally relates to a method for synthesizing NiO / ZnO nanoparticles using solution combustion synthesis. The method comprising: dissolving 10 grams of Zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and 10 grams of Nickel(II) nitrate hexahydrate (Ni(NO3)2·6H2O) in 30 ml of double-distilled water to obtain a solution; adding at least one fuel selected from a group consisting of glucose, urea, and combinations thereof to the solution; stirring the solution for one hour to achieve homogeneity and transferring the homogeneous solution into a Pyrex dish; placing the dish inside a preheated muffle furnace at a temperature range of 440° C. to 460° C. and allowing the solution to boil, froth, and undergo exothermic combustion thereby retrieving the resulting fine nanoparticle powder upon completion of the reaction within 20 minutes; and cooling the synthesized powder to room temperature and grinding the powder to achieve a fine, uniform consistency, thereby forming NiO / ZnO nanoparticles.

The invention relates to a NiCoW-CoP / Co3O4 (at) NF self-supporting heterostructure catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a CoP-coated NF precursor on foamed nickel through a constant potential electrodeposition method, then carrying out annealing treatment in a muffle furnace, and finally carrying out electrodeposition on NiCoW-LDH to obtain the NiCoW-CoP / Co3O4-coated NF material. According to the preparation method, the microsphere material with the surface covered with the dendritic dendrites is synthesized, and exposure of active sites is increased through the special surface structure of the microsphere material. The compounding of the trimetal hydroxide containing high-valence tungsten and the introduction of oxygen vacancies can effectively enhance the local electron density of oxygen atoms on the surface of the catalyst, thereby enhancing the catalytic performance and seawater corrosion resistance of the material. Compared with the prior art, the method disclosed by the invention is simple to operate and low in cost, and the prepared catalyst has high electrocatalytic activity, relatively low hydrogen evolution overpotential and oxygen evolution overpotential and long-time stability. And the method has important theoretical significance and potential application value for developing a bifunctional electrocatalyst suitable for electrolyzing seawater.

The invention discloses a method for synthesizing an oxide dispersion strengthened molybdenum-rhenium alloy through a liquid-liquid doping process. The method comprises the following steps that S1, a molybdenum-rhenium mixed solution is prepared; s2, preparing a molybdenum-rhenium-doped mixed solution, namely dissolving precursor nitrate of an oxide into water, and then adding into the molybdenum-rhenium mixed solution; s3, heating treatment is conducted, specifically, the molybdenum-rhenium-doped mixed solution is mechanically stirred, then water is evaporated through heating to obtain a crystallized product, and then the crystallized product is filtered, dried and sieved to obtain composite powder; s4, calcining and thermal decomposition: calcining the composite powder to obtain pyrolysis powder; s5, thermal reduction is conducted, specifically, hydrogen is introduced into the muffle furnace, and the pyrolysis powder is reduced into oxide-doped molybdenum-rhenium alloy powder; and S6, bar preparation is conducted, specifically, the bar is obtained through cold isostatic pressing, high-temperature hydrogen sintering, forging and rotary swaging treatment. The oxide is stably dispersed in the molybdenum-rhenium alloy in a nanoscale form, and the performance of the alloy at the high temperature can be remarkably improved.

The invention discloses a preparation method for preparing a biomass porous carbon material through high-temperature carbonization of molten salt and application of the biomass porous carbon material, and belongs to the technical field of synthesis of inorganic functional materials. According to the technical scheme, the method is characterized in that sodium chloride and potassium chloride are mixed into mixed salt according to different proportions, then the mixed salt is mixed with enteromorpha biomass according to a certain proportion, the mixture is placed in a porcelain crucible, the mixed salt is added for covering, the porcelain crucible is placed in a muffle furnace to be heated and carbonized, and the porous biomass carbon material is obtained after water washing and drying. The enteromorpha biomass is selected as the raw material, the operation is simple and controllable, the cost is low, batch production can be realized, and the prepared novel porous biomass carbon material has a complex porous structure, a large specific surface area, a very good catalytic effect, strong adsorption capacity and good conductivity, and shows excellent performance when being applied to the field of advanced oxidation.

The invention discloses an acidic organic fertilizer and a preparation method thereof, relates to the technical field of organic fertilizers, and solves the problems of high alkalinity, fast decomposition and poor long-term carbon sequestration stability of existing organic fertilizers. The preparation method comprises the following steps: adding charcoal powder and FeCl3. 6H2O into absolute ethyl alcohol, uniformly stirring, performing ultrasonic treatment, drying, uniformly grinding, calcining in a muffle furnace, and grinding again to obtain charcoal-loaded nano iron particles; uniformly mixing fresh pig manure and / or chicken manure with crushed rice and / or corn straw, and adjusting the water content with water; adding charcoal-loaded nano-iron particles, uniformly mixing, and piling into a strip pile body; the temperature of the pile body is tested in real time, the pile is turned for multiple times in the heating process when spontaneous heating begins, the pile is not turned in the cooling process when spontaneous heating ends, when the temperature of the pile body is reduced to 40 DEG C or below, composting is finished, and the decomposed pile body sample is smashed to obtain the acidic organic fertilizer. The method has wide popularization and application prospects in agricultural waste resource utilization and organic fertilizer production.

The present invention discloses a preparation method and application of a Bi2O2S / Bi 12 TiO 20 composite photocatalytic material, which includes weighing Bi2O3 and titanium dioxide, grinding them evenly, putting them into a muffle furnace, heating to 700 °C, maintaining the temperature for 6 - 8 h, and then naturally cooling to room temperature to obtain Bi 12 TiO 20 catalyst; dispersing Bi 12 TiO 20 in deionized water, adding a hydrazine hydrate solution of thiourea, stirring, adding KOH and NaOH, stirring well, standing, centrifuging, washing the centrifuged product alternately with water and ethanol, and drying to obtain Bi2O2S / Bi 12 TiO 20 composite photocatalyst. The present invention adopts the normal temperature standing method, and the energy consumption during the synthesis process is low; the Bi2O2S / Bi 12 TiO 20 composite material is a block-coupled sheet combination structure, and the combination of the two materials can greatly improve the separation efficiency of electron-hole pairs and has excellent performance in photocatalytic degradation of 2,4-dichlorophenol.

The invention discloses a ruthenium and samarium double monatomic doped three-dimensional titanium-based tin antimony nickel electrode and a preparation method and application thereof. The preparation method of the electrode comprises the following steps: (1) pretreating the titanium felt; (2) preparing a sol impregnation liquid; (3) sol coating and drying: dipping the pretreated titanium felt in the prepared sol dipping liquid, fully adsorbing and then drying to form a uniform precursor layer; and (4) roasting treatment is conducted, specifically, the dried titanium felt is placed in a muffle furnace to be roasted, and then the steps of dipping, drying and roasting are repeated till the final ruthenium and samarium double monatomic doped three-dimensional titanium-based tin-antimony-nickel electrode is obtained. In the prepared electrocatalyst, ruthenium and samarium are doped into a tin-antimony-nickel electrode in a monatomic form, the utilization efficiency of ruthenium and samarium atoms is improved, and the electrode is endowed with excellent electrocatalytic activity. The unique three-dimensional structure and double-monatomic doping significantly enhance the electron transfer rate and the reaction kinetic characteristics, so that the electrode shows excellent stability and efficient hypochlorous acid generation ability.

The invention relates to a red fluorescent material excited by blue light, an LED device and fluorescent ceramic. The chemical formula of the red fluorescent material is La (2-x) MgNbO6.5: xEu < 3 + >, wherein x is more than or equal to 0.01 and less than or equal to 0.1. The preparation method comprises the following steps: weighing lanthanum oxide, magnesium oxide, niobium oxide and europium oxide raw materials according to a stoichiometric ratio, grinding and uniformly mixing; sintering the uniformly mixed powder in a muffle furnace at high temperature, and cooling to room temperature to obtain the red fluorescent material. Compared with the prior art, the novel oxide-based red fluorescent powder prepared by the invention can emit positive red light of which the central wavelength is 616nm under the excitation of 465nm blue light, and can be used for white light LED (Light Emitting Diode) luminescent devices and fluorescent ceramics.

The invention belongs to the technical field of acidic electrolyzed water, and discloses a transition metal or rare earth element doped ruthenium dioxide catalyst, a preparation method and application of the transition metal or rare earth element doped ruthenium dioxide catalyst in acidic electrolyzed water, the preparation method comprises the following steps: weighing ruthenium metal salt, dissolving the ruthenium metal salt in an acidic aqueous solution, and carrying out mechanical stirring at room temperature to obtain a mixed solution A; adding transition metal or rare earth element salt into the mixed solution A, and mechanically stirring at room temperature to obtain a mixed solution B; adding a carbon template for adsorbing metal ions in the solution into the mixed solution B, ultrasonically dispersing uniformly, and mechanically stirring at room temperature to obtain a mixed turbid liquid C; placing the mixed turbid liquid C on a heating plate for high-temperature mechanical stirring so as to remove moisture in the turbid liquid, and fully grinding and evaporating the obtained sample; and taking a proper amount of the ground sample, and carrying out air calcination in a muffle furnace, wherein the calcination is used for decomposing the carbon template and oxidizing metal ions to obtain the transition metal or rare earth element doped ruthenium dioxide nanoparticles.

The invention relates to the technical field of preparation of silicon dioxide aerogel, in particular to a method for preparing low-cost silicon dioxide aerogel from high-silicon fly ash, and the preparation method comprises the following steps: S1, putting fly ash which passes through a 200-mesh sieve into a drying box at 105 DEG C, drying for 10-12 hours, and calcining in a muffle furnace at 750-950 DEG C for 2-3 hours; s2, carrying out acid leaching treatment on the calcined fly ash, then carrying out suction filtration, drying obtained acid sludge, then adding a sodium hydroxide solution with the mass fraction of 5-20%, carrying out alkali dissolution for 2-5 hours under the condition of 60-100 DEG C, and then carrying out suction filtration; s3, putting the solution obtained by suction filtration in the step S2 into a drying oven, aging at 60-65 DEG C for 36-48 hours, and washing with deionized water for 3-4 times to obtain high-silicon fly ash gel; and S4, adding an interface modifier into the high-silicon fly ash gel, and drying at normal pressure to form powder, namely the low-cost silicon dioxide aerogel. Through the synergistic effect of the interface modifier and the crosslinking modification liquid, the skeleton toughness is remarkably improved, the drying shrinkage rate is reduced, and the gel cracking risk is reduced.

The invention provides a method for preparing a zirconium boride ceramic material through pressureless sintering, and belongs to the technical field of zirconium boride ceramics. The method comprises the steps of preparing zirconium boride composite powder, modifying silicon carbide nanowires and mixing and sintering. The method for modifying the silicon carbide nanowire comprises the steps of acid treatment and modification, the modification step comprises the following steps: adding aluminum isopropoxide into absolute ethyl alcohol, adding a nitric acid solution, stirring for 1.5-2.0 hours at the temperature of 60-63 DEG C, adding the acid-treated silicon carbide nanowire, carrying out ultrasonic dispersion and water bath evaporation, then drying, putting into a muffle furnace, and carrying out heat preservation for 2.0-2.2 hours at the temperature of 490-500 DEG C to obtain a modified silicon carbide nanowire; the ceramic material prepared by adopting the method disclosed by the invention is high in density, good in mechanical property and excellent in high-temperature oxidation resistance and stability in a complex environment.

The invention belongs to the technical field of sewage treatment, and particularly relates to modified biochar for removing lead in wastewater as well as a preparation method and application of the modified biochar. The preparation method comprises the following steps: uniformly mixing sieved straw powder and monocalcium phosphate in a weight ratio of (1-5): 1 to form a mixture; putting the mixture into a ceramic crucible, putting the ceramic crucible into a muffle furnace, heating to 300 DEG C at the temperature of 10 DEG C / min, and pyrolyzing for 1 hour; after the ceramic crucible is cooled to the room temperature, transferring the ceramic crucible into a tubular furnace, heating to 550 DEG C at the temperature of 10 DEG C / min, and pyrolyzing for 2 hours, so as to obtain a cooled product, namely the modified biochar. The modified biochar is prepared by the method. According to the application, modified biochar is added into a lead-containing solution, and the modified biochar is used for adsorbing lead in the solution. The modified biochar provided by the invention can improve the lead adsorption capacity.

The invention discloses a multiphase coexisting high-entropy glass ceramic material and a preparation method thereof, and the method comprises the following steps: step 1, uniformly mixing Na2CO3, K2CO3, BaCO3, SrCO3, CaCO3, Bi2O3, TiO2, Nb2O5 and SiO2 to obtain a mixture A; 2, the mixture A is added into a crucible preheated to 1200 DEG C, then the temperature is increased to 1450 DEG C, heat preservation is conducted to enable the mixture A to be completely molten till no bubble is generated, a melt is obtained, then the melt is poured into a mold preheated to 300 DEG C, and a product B is obtained after forming; 3, transferring the product B to an annealing furnace which is heated to 500-600 DEG C in advance, preserving heat, and cooling along with the furnace to obtain a glass sample; and step 4, putting the glass sample into a muffle furnace, heating from room temperature to 850-950 DEG C at a heating rate of 5 DEG C / min, preserving heat, crystallizing the glass sample, and cooling along with the furnace to obtain the multi-phase coexisting high-entropy glass ceramic material. The preparation method is simple in process, and the prepared high-entropy glass ceramic has high breakdown strength and excellent energy storage density and energy storage efficiency.

The invention relates to the technical field of catalyst preparation, in particular to a preparation method of a modified catalyst and application of the modified catalyst in methanol regeneration in methane conversion, and the preparation method comprises the following steps: S1, mixing zinc nitrate, urea, a mesoporous regulating agent and deionized water, and stirring under a water bath condition; s2, aging the mixed solution obtained in the step S1 at 68-70 DEG C for 2-3 hours, centrifugally separating, washing the solid with deionized water until the solid is neutral, washing with absolute ethyl alcohol, and drying to obtain precursor powder; and S3, ball-milling and mixing the precursor powder, urea and the load modifier for 20-30 minutes, calcining in a muffle furnace in an air atmosphere, naturally cooling, grinding, and sieving with a 200-mesh sieve to obtain the nitrogen-doped modified catalyst. Aiming at the field of preparing high-value chemicals from methane through photocatalysis, the invention provides a method for inhibiting the peroxidation of methane by constructing chemical bonds to solve the problem of generating carbon dioxide by peroxidation of methane, and provides a new method for solving the problem of peroxidation of methane.

The invention belongs to the technical field of denitration catalysts, and discloses a CO-SCR denitration catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) putting honeycomb cordierite into a muffle furnace for preliminary calcination to obtain a carrier; (2) immersing the carrier into a mixed solution containing an aluminum source and an alkaline nitrogen source for hydro-thermal treatment, taking out the carrier after hydro-thermal treatment, and washing and drying to obtain a surface modified carrier; (3) preparing a bottom layer coating solution containing catalyst powder and a first pore-forming agent; preparing a surface layer coating solution containing catalyst powder and a second pore forming agent; wherein the average particle size of the first pore-forming agent is larger than that of the second pore-forming agent; (4) immersing the surface modified carrier into the bottom layer coating liquid for coating, carrying out primary drying, then immersing the surface modified carrier into the surface layer coating liquid for coating, and carrying out drying treatment to obtain a catalyst precursor; and (5) calcining the catalyst precursor to obtain the CO-SCR denitration catalyst.

The invention relates to the field of oil-water separation and sewage treatment, in particular to a preparation method of an oleophylic ceramsite material for industrial sewage treatment.The preparation method comprises the steps that 1, blast furnace slag, iron tailing powder, waste activated carbon powder and river sand are weighed according to the weight ratio and placed in a ball mill to be fully mixed, and mixed powder is obtained; (2) adding silicon dioxide nano hollow spheres, mixing, adding water glass, and fully mixing to obtain a ceramsite blank; (3) putting the prepared ceramsite blank into a muffle furnace for staged sintering; (4) preparing a catalyst precursor solution; (5) in a vacuum tank, putting the sintered ceramsite blank into a catalyst precursor solution, and then carrying out acid pickling to remove the silicon dioxide hollow nanospheres, so as to obtain modified ceramsite; and (6) drying the obtained modified ceramsite, and then placing the dried modified ceramsite in an atmosphere furnace for heat preservation to obtain the oleophylic ceramsite. According to the method, an electronic structure is regulated and controlled and the adsorption energy of an intermediate is optimized through the synergistic effect of Fe and Co, so that a stable oleophylic structure is obtained.

The invention discloses a method for preparing single-phase beta-CaSiO3 powder based on chlorine-based molten salt, and belongs to the technical field of ceramic powder materials. The method comprises the following steps: 1, mixing a salt material: weighing raw materials CaCO3 and SiO2 required by CaSiO3 and chlorine-based molten salt according to a ratio, pouring the raw materials into a ball milling tank containing zirconium oxide beads, carrying out ball milling and uniform mixing by taking absolute ethyl alcohol as a solvent, and then discharging, drying and sieving to obtain the mixed salt material; step 2, high-temperature calcination: putting the mixed salt material obtained in the step 1 into a crucible, and putting the crucible into a muffle furnace for high-temperature calcination to form a beta-CaSiO3 crystal phase; step 3, washing and desalting: adding deionized water into the mixture of beta-CaSiO3 and molten salt calcined in the step 2, stirring, then carrying out suction filtration, and washing for multiple times to remove the molten salt; and then drying to obtain the single-phase beta-CaSiO3 powder. The method disclosed by the invention has the characteristics of low synthesis temperature, simple process, short synthesis period, low cost, no pollution and industrial production, and the prepared beta-CaSiO3 powder based on the chlorine-based molten salt is high in purity and does not contain other impure phases.

The invention relates to a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate composite photo-anode and a product and application thereof, and belongs to the technical field of photoelectrocatalysis. The invention discloses a preparation method of an oxygen vacancy-rich bismuth molybdate / bismuth vanadate (Bi2Mo2O9 / BiVO4) composite photo-anode, which mainly comprises the following steps: immersing a fluorine ion-doped tin dioxide (FTO) conductive glass substrate into a Bi < 3 + > ion solution and an I <-> ion solution to form a bismuth oxyiodide (BiOI) film, dropwise adding a dimethyl sulfoxide solution of vanadyl acetylacetonate (VO (acac) 2), and putting into a muffle furnace to prepare the BiVO4 photo-anode. And then vertically immersing into a Bi < 3 + > ion solution and a Mo < 6 + > ion solution, and carrying out annealing treatment in an argon atmosphere to prepare the Bi2Mo2O9 / BiVO4 composite photoanode rich in oxygen vacancies. The Bi2Mo2O9 / BiVO4 material rich in oxygen vacancies is a metal oxide composite photo-anode, the photoelectrocatalysis efficiency can be improved, and hydrogen peroxide (H2O2) can be continuously generated in natural seawater through photoelectrocatalytic oxidation of water for a long time.

The invention discloses a sodium-ion battery hard carbon negative electrode material derived based on waste fruit shells and a preparation method and application thereof. The method comprises the following steps: washing, drying and crushing waste shells from betel nut shells, transferring the crushed shells into a muffle furnace, carbonizing the shells in an air atmosphere, and naturally cooling the shells to obtain a pre-carbonized material; the pre-carbonized material is pretreated through a hydrothermal method, a ball milling method or a molten salt auxiliary method; transferring the pretreated product into an atmosphere furnace, performing high-temperature carbonization under the protection of inert gas, and cooling after carbonization is finished; and cooling, soaking in an acid solution, washing with deionized water and ethanol until the solution is neutral, and drying, grinding and sieving the obtained product. The waste betel nut shell precursor is adopted, the prepared hard carbon material has proper interlayer spacing and pore structure through proper regulation and control of pretreatment, more sodium ion active sites are provided, and the first coulombic efficiency, rate capability and cycling stability of the material are improved.

The invention belongs to the technical field of nano material preparation, and provides a preparation method and application of a rare earth ytterbium-doped copper oxide nano material. The method comprises the following steps: dissolving rare earth ytterbium salt, copper salt and a surfactant in a solvent, and uniformly stirring; dissolving an organic ligand in a solvent; stirring and mixing the two solutions, transferring into a reaction kettle, and carrying out hydrothermal reaction; and centrifugally washing the obtained product with ethanol, and drying to obtain the rare earth ytterbium doped metal organic precursor nano material. And placing the obtained nano material in a muffle furnace for high-temperature calcination to obtain the rare earth ytterbium doped copper oxide material. The preparation method provided by the invention is simple, green, pollution-free and high in practical degree, and the obtained rare earth ytterbium-doped copper oxide nano material can be used as a catalyst for synthesizing ammonia by electrolytic nitrate reduction, and shows that the rare earth ytterbium-doped copper oxide nano material has relatively high ammonia yield and Faraday efficiency for synthesizing ammonia by nitrate reduction.

The invention discloses a method for intensively leaching chromium from vanadium extraction waste slag, and belongs to the field of metallurgical chemical industry. According to the method, diboron trioxide serves as a catalyst, vanadium extraction waste slag, sodium carbonate and sodium hydroxide serve as raw materials, the raw materials and the catalyst are mixed according to a set proportion, and leaching is conducted after roasting is conducted in a microwave muffle furnace. According to the method provided by the invention, the reaction can be promoted to be efficiently carried out at medium and low temperatures, the extraction rate of chromium can reach 95% or above, and the synergistic effect of'low addition amount-high catalytic efficiency 'can be realized under the condition that a small amount of catalyst is added.

The utility model relates to vertical annealing equipment for a metal ultra-thin strip and an operation method, and belongs to the related technical field of metal ultra-thin strip hot working, the vertical annealing equipment comprises a furnace body device, a tension measuring device, a direction roller, an unwinding device, a winding device, a straightening device and a deviation rectifying device, the furnace body device comprises a muffle tank and a furnace body shell, a plurality of groups of elastic brackets fixedly connected with the furnace body shell are arranged on the outer side of the muffle tank in the length direction of the muffle tank, and the top of the muffle tank is fixedly connected with the top of the inner side of the furnace body shell through the top elastic bracket, so that the service life of the muffle furnace is prolonged; one side of the furnace body shell is respectively connected with a molecular pump and a gas inlet through steel pipes, the other side of the furnace body shell is provided with a gas outlet, and pipelines for connecting the molecular pump, the gas inlet and the gas outlet are respectively provided with a gas valve, so that the conversion between vacuum annealing and atmosphere annealing in the muffle furnace is realized; and the straightening device comprises a plurality of straightening rollers, so that high-precision straightening can be carried out on the annealed metal ultra-thin strip, and the strip shape quality of the strip is effectively improved.

The invention relates to the technical field of pressure sensors, and provides a differential pressure sensor sensitive structure and a packaging method, and the packaging method comprises the following steps: preparing a screen printing plate; printing glass slurry on the lower substrate layer wafer; printing glass slurry on the upper substrate layer wafer; the printed lower substrate layer wafer and the printed upper substrate layer wafer are placed in a drying oven to be subjected to glue discharging and pre-sintering; the lower substrate layer wafer and the pressure sensing film layer wafer are pre-fixed after being aligned; aligning the upper substrate layer wafer with the fixed lower substrate layer wafer and the pressure sensing film layer and then pre-fixing the upper substrate layer wafer and the fixed lower substrate layer wafer and the pressure sensing film layer; putting the three layers of pre-fixed wafer combinations into a variable-load muffle furnace, and applying a pre-load for sintering; cutting up the three layers of wafers to form a naked DIE of the MEMS header; and mounting an ASIC bare DIE, and interconnecting each electrode with the ASIC chip to complete electrical connection. The packaging precision, the structural stability, the electrical performance and the production efficiency of the differential pressure sensor sensitive structure are improved, and meanwhile the production cost is reduced.

The invention discloses a low-cost Na2ZrO3-based CO2 adsorbent and a preparation method of the low-cost Na2ZrO3-based CO2 adsorbent. The method comprises the following steps: (1) adding zirconium silicate powder and a heated high-concentration sodium hydroxide solution into a reaction kettle; (2) putting the closed reaction kettle into a muffle furnace for heating reaction; (3) taking out the reaction kettle, quickly cooling by water, carrying out solid-liquid separation on the product, collecting a filter cake, washing and drying; and (4) mixing and calcining the dried solid and sodium carbonate powder to obtain a target product. According to the method, low-cost zirconium silicate is used as a zirconium source, low-energy-consumption effective separation of Zr and Si in zircon sand is achieved through an alkali fusion method, the Na2ZrO3-based CO2 adsorbent is synthesized, the preparation cost of the adsorbent is effectively reduced, a technical basis is provided for resource utilization of subsequent separation products, and in addition, the method has the advantages of being simple in process, low in cost and good in application prospect. The prepared adsorbent has extremely strong CO2 adsorption performance at high temperature, and a new technical thought is provided for industrial application of the adsorbent.

The invention relates to a preparation method of spherical alpha-alumina powder with uniform particle size. The preparation method comprises the following steps: dissolving alkoxy aluminum in water-soluble alcohol to prepare an alcoholic solution of aluminum salt; the preparation method comprises the following steps: dissolving a surfactant hydroxy propyl cellulose in a water-soluble organic solvent, and magnetically stirring to obtain a surfactant solution; the preparation method comprises the following steps: dissolving deionized water in water-soluble alcohol, and stirring to obtain an alcohol solution of water; the preparation method comprises the following steps: mixing and stirring a surfactant solution and an aluminum source solution, dropwise adding the solution into a mixed solution of a surfactant and an aluminum source, stirring, aging the reacted solution to obtain a precipitate, centrifuging the solution, and drying in a drying oven to obtain precursor powder; and calcining the precursor powder in a muffle furnace, and grinding the product to obtain the alpha-alumina powder with uniform particle size which reaches the particle size of 200-700nm. When the modified PE diaphragm is used as a lithium ion battery diaphragm coating, the nucleation overpotential of the first circle of a lithium ion symmetric battery assembled by the modified PE diaphragm is only 15mV under the current density of 1mA cm <-2 >.

The invention belongs to the field of PET (polyethylene glycol terephthalate) plastic waste treatment, and particularly relates to preparation of a copper oxide-nickel hydroxide core-shell structure catalytic material and application of the copper oxide-nickel hydroxide core-shell structure catalytic material to preparation of high-added-value formic acid by upgrading electro-catalysis PET plastics, and the preparation method comprises the following steps: (1) placing a copper conductive substrate in an alkali etching mixed solution for alkali etching treatment, obtaining a conductive substrate on which a Cu (OH) 2 precursor grows; (2) placing the conductive substrate on which the Cu (OH) 2 precursor grows in a muffle furnace for heat treatment to obtain a conductive substrate on which CuO nanowires grow; and (3) placing the conductive substrate on which the CuO nanowire grows in a hydrothermal kettle, and obtaining the CuO-coated Ni (OH) 2-x core-shell structure catalyst through a hydrothermal method.