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2521 results about "Tube furnace" patented technology

A tube furnace is an electric heating device used to conduct syntheses and purifications of inorganic compounds and occasionally in organic synthesis. One possible design consists of a cylindrical cavity surrounded by heating coils that are embedded in a thermally insulating matrix. Temperature can be controlled via feedback from a thermocouple. More elaborate tube furnaces have two (or more) heating zones useful for transport experiments. Some digital temperature controllers provide an RS232 interface, and permit the operator to program segments for uses like ramping, soaking, sintering, and more. Advanced materials in the heating elements, such as molybdenum disilicide offered in certain models can now produce working temperatures up to 1800 °C. This facilitates more sophisticated applications. Common material for the reaction tubes include alumina, Pyrex, and fused quartz.

Preparation method of nano porous metal oxide/carbon lithium ion battery cathode material

The invention provides a preparation method of a nano porous metal oxide/carbon lithium ion battery cathode material. The preparation method comprises the following steps: firstly, weighting ferric salt or manganese salt and carboxylate organic ligands, and putting into a high-pressure reaction kettle; and after a polar solvent is added and dissolved, carrying out a hydrothermal reaction for 10-72h at 100-180 DEG C to generate a transition metal coordination polymer precursor; and after the transition metal coordination polymer precursor is washed and dried, decomposing the precursor for 0.5-6h at a temperature of 300-600 DEG C in an inert atmosphere in a tube furnace, thus obtaining a nano porous metal oxide/carbon lithium ion battery cathode material containing iron oxides or manganese oxides. According to the preparation method, since the transition metal coordination polymer precursor which is structurally designable and controllable is used as a template-type precursor, a nano porous metal oxide/carbon lithium ion battery cathode material is obtained by using an in-situ thermal decomposition method. The method is simple in process, and the obtained products have the advantages of high electrical conductivity, high specific capacity, good cycle stability, excellent high-ratio discharge performance and high energy density.
Owner:JIANGSU UNIV

Method for preparing cathode material of sodium-ion battery, namely sodium vanadium fluorophosphates

The invention discloses a method for preparing a cathode material of a sodium-ion battery, namely sodium vanadium fluorophosphates. The method comprises the following steps: using a vanadium source, a phosphorus source and a carbon source as main synthetic raw materials; dissolving into deionized water according to the molar ratio 1:1:1.2 of vanadium: phosphorus: carbon, heating in water bath, and continuously stirring to obtain light green pulp; after vacuum drying, grinding, then transferring into a tube furnace, preburning in an inert atmosphere at a certain temperature rise rate, cooling and then taking out to obtain black VPO4/C precursor powder; mixing the VPO4/C with NaF according to a stoichiometric ratio, ball-milling for 3 hours, sending into the tube furnace, then roasting in the inert atmosphere at the certain temperature rise rate, and cooling along with the furnace to obtain a positive active material NaVPO4F/C. According to the invention, cheap and easily-obtained pentavalent vanadium oxide or trivalent vanadium oxide is used as the main raw materials to prepare the sodium vanadium fluorophosphates cathode material through a sol gel activated auxiliary two-step high-temperature solid phase method, and the sodium vanadium fluorophosphates cathode material has the advantages of good stability, uniform particle size and good electrochemical performance. Meanwhile, the method has the advantages of simple synthesis process, short period and low cost and is convenient for large-scale production.
Owner:TIANJIN POLYTECHNIC UNIV

Carbon cladded ferriferrous oxide negative electrode material of lithium ion battery and preparation method thereof

The invention discloses a carbon cladded ferriferrous oxide negative electrode material of a lithium ion battery and a preparation method thereof. The negative electrode material is a carbon cladded Fe3O4 composite material and has a particle size in a range of 1 to 100 nm. The preparation method comprises the following steps: with NaCl used as a dispersing agent and a supporter, fully mixing NaCl with a metal oxide source and a solid carbon source; drying an obtained mixed solution under vacuum to obtain a mixture; placing the mixture into a tubular furnace for calcination in an inert atmosphere so as to obtain a calcined product; and rinsing and grinding the calcined product to obtain carbon cladded metal oxide nanometer particles. The method is safe and non-toxic and is simple to operate; during charging and discharging tests of a lithium ion button cell made of the carbon cladded ferriferrous oxide negative electrode material, discharge specific capacity can be maintained at 620 to 900 mAh/g after 30 cycles of charging and discharging at a current of 0.1C (with current density being 92 mA/g), and discharge specific capacity can be maintained at 600 to 760 mAh/g after 50 cycles of charging and discharging at a current of 1C (with current density being 920 mA/g); and the negative electrode material of the lithium ion battery has high reversible capacity and good cycling stability.
Owner:TIANJIN UNIV

Preparation method of biomass-based nitrogenous porous carbon, porous carbon prepared by method and use thereof

The invention discloses a preparation method of biomass-based nitrogenous porous carbon, the porous carbon prepared by the method and the use of the prepared nitrogenous porous carbon in a super capacitor. The preparation method comprises the steps of (1) drying a biomass material, and grinding the biomass material into fine powders, (2) evenly mixing the biomass material powders and water or a dilute acid solution, (3) placing the above mixture into a reactor for hydrothermal reaction, and (4) drying and grinding an obtained hydrothermal reaction product, and calcining the hydrothermal reaction product in a tube furnace to obtain a nitrogen-doped porous carbon material with a large surface area. According to the method of the invention, cheap and renewable plant is used as carbon and nitrogen precursors, and the porous nitrogen-doped carbon material is prepared through a hydrothermal method. The method has the advantages of simple preparation process, no need of an activator or template agent, low cost, environmental protection, and convenient operation, problems of strong corrosion, a high price of transition metal and environmental pollution caused by heavy metal are avoided, and the method is suitable for mass production.
Owner:QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1

Preparation method for two-dimensional sheet-shaped titanium dioxide nanosheet material

The invention discloses a preparation method for a two-dimensional sheet-shaped titanium dioxide nanosheet material. The preparation method comprises the following steps: soaking three-dimensional laminated Ti3AlC2 powder in an aqueous solution of HF at a room temperature, and removing an Al atom layer by use of a chemical liquid-phase dissection method to prepare a two-dimensional Ti3C2 nanosheet with laminated characteristics still kept; then, placing Ti3C2 in a tubular furnace, ventilating a gas mixture of flowing oxygen gas and argon gas after vacuumizing, realizing in-situ oxidization of the two-dimensional Ti3C2 nanosheet at a high temperature, then cooling, taking out powder, and grinding to obtain the TiO2 nanosheet. According to the preparation method disclosed by the invention, any organic solvent and additive are not needed to be added in the preparation process, process parameters are stable, the procedure is simple, the process is controllable, the efficiency is high and the cost is low; the prepared two-dimensional titanium dioxide nanosheet has transverse dimension of 5-10 microns, and single-layer average thickness of 50 nanometers; the prepared rutile type titanium dioxide nanosheet is high in purity and good in degree of crystallinity, and only contains very little antase phase.
Owner:HOHAI UNIV

Preparation method for a large-area single-layer or few-layer molybdenum disulfide film

The invention discloses a preparation method for a large-area single-layer or few-layer molybdenum disulfide film. The main steps of the preparation method are as follows: firstly, sulfur powder and molybdenum trioxide powder are placed in two quartz boats respectively, a substrate is placed on the quartz boat loaded with molybdenum trioxide powder, and the obverse surface faces downwards; secondly, the two quartz boats loaded with sulfur powder and molybdenum trioxide powder are placed at a bottom end and an orifice of a quartz test tube respectively; thirdly, the above quartz test tube is placed in a tubular furnace, the bottom end and the orifice of the test tube are located at the edge area and the central area of the tubular furnace respectively; fourthly, protection gas argon or nitrogen is inputted into the tubular furnace, a normal pressure is kept until the experiment is over; fifthly, the tubular furnace is heated at a certain heating speed, thus the edge area and the central area of the tubular furnace are in proper temperatures respectively, the temperatures are kept for some time, sulfur powder sublimates and reacts with gas phase molybdenum trioxide, and a large-area single-layer or few-layer molybdenum disulfide film is generated on the substrate; sixthly, the tubular furnace is cooled to the room temperature, and the preparation process is finished. The method is slightly affected by air flow, the repetition rate is high, preparation of high-quality large-area single-layer or few-layer molybdenum disulfide film can be achieved at a normal pressure.
Owner:XIANGTAN UNIV

Doped hexagonal boron nitride nano sheet, preparation method thereof, catalyst using same as carrier, and applications thereof

The invention relates to a doped hexagonal boron nitride nano sheet, a preparation method thereof, a catalyst using the same as the carrier, and applications thereof. The preparation method comprises the following steps: adding a single substance or compound of hetero atoms, a single substance or compound of boron, and a nitrogen compound into water, evenly mixing, drying to remove water; then grinding the solid, placing the powder in a tubular furnace, introducing inert gas into the tubular furnace, heating the tubular furnace to a temperature of 800 to 1200 DEG C by program to carry out reactions, after reactions, cooling to the room temperature; grinding the reaction products, then boiling the grinded products in hot water, filtering when the water is still hot, washing the filter residue by hot water and ethanol, and drying. The doped hexagonal boron nitride nano sheet is taken as the carrier to prepare a catalyst, the active components loaded on the carrier can be one or more of transition metals, and the catalyst is used to catalyze organic reactions. A high temperature pyrolysis method is adopted, and the controllable preparation of nano material is achieved through controlling the ratio of each element in raw materials. The method is simple, the operation is easy, and the yield is high. The doped hexagonal boron nitride nano sheet can be used as the catalyst carrier, and is capable of improving the dispersity and catalytic activity of metal nano particles.
Owner:SHANTOU UNIV

Method for preparing silicon-carbon compound from silicon-containing biomass as raw material as well as prepared silicon-carbon compound and application thereof

The invention provides a method for preparing a silicon-carbon compound from silicon-containing biomass as a raw material. The method comprises the following steps: performing acid boiling treatment on the silicon-containing biomass so as to remove inorganic salt ion impurities, washing, drying, grinding into powder, carbonizing in inert atmosphere so as to obtain a composite product of silicon dioxide and carbon, uniformly mixing the carbonized product, magnesium powder and molten salts, and putting into a tubular furnace to react in inert atmosphere, thereby obtaining a porous silicon-carbon composite material that porous silicon nanoparticles are uniformly distributed in carbon. The method is simple and feasible in process and rich and cheap in raw material, the reaction temperature is controlled as heat is absorbed when the added molten salts are molten, the structure that silicon dioxide is naturally embedded into organisms in original silicon-containing biomass is well maintained in the obtained silicon-carbon compound, and moreover, the obtained silicon nanoparticles are uniform in particle size distribution and can be applied to the field of lithium ion battery cathode materials.
Owner:WUHAN UNIV OF SCI & TECH

Ammoniated ultrathin graphite-phase carbonitride photocatalyst and preparation method thereof

The invention discloses an ammoniated ultrathin graphite-phase carbonitride photocatalyst material and a preparation method thereof. The ammoniated ultrathin graphite-phase carbonitride photocatalyst material resembles wrinkled tulle, is in the shape of tulle with wrinkles and has a uniform thickness of 3 to 5 nm; and the surface of the material is smooth and contains rich amino groups. The preparation method comprises the following steps: acidifying melamine so as to obtain a protonated melamine supermolecular structure crystal, carrying out calcining in an inert protective atmosphere so as to prepare a graphite-phase carbonitride material and carrying out uniformization so as to obtain ultrafine powder of a graphite-phase carbonitride photocatalyst material; and placing the ultrafine powder of the graphite-phase carbonitride photocatalyst material and an ammonia-source substance capable of producing ammonia gas through thermal decomposition into a tubular furnace, introducing inert gas for deoxygenation and then carrying out gradient calcining in the inert protective atmosphere, i.e., carrying out heating to 500 to 540 DEG C at first, maintaining the temperature for 2 to 4 h, then carrying out heating to 560 to 600 DEG C, maintaining the temperature for 2 to 3 h and then carrying out cooling. The ammoniated ultrathin graphite-phase carbonitride photocatalyst material has substantially improved photocatalysis efficiency and present excellent photocatalysis performance when applied to catalytic reduction of CO2.
Owner:WUHAN UNIV OF TECH

New method for producing active carbon by using biomass wastes

The invention discloses a new method for producing efficient active carbon by using biomass wastes (walnut shells, rape stems, wheat straws, Chinese medicinal dregs and the like) as raw materials, using pyrolusite as a hole forming agent and using zinc chloride as an active agent. The method comprises the following processes of: (1) drying the biomass waste raw materials till the water content is less than 15 percent, mechanically crushing the raw materials, and sieving the crushed raw materials with a sieve of 100 meshes; (2) adding 5 to 10 percent of pyrolusite into the raw materials, and mixing the pyrolusite and the raw materials uniformly; (3) soaking the pre-treated raw materials into 3 to 7mol/L zinc chloride solution for 24 hours, wherein the soaking ratio (the mass of the raw materials to the mass of the zinc chloride solution) is 1:1-1:2; (4) putting the soaked raw materials into a tubular furnace, introducing inert gas (such as nitrogen or carbon dioxide gas), heating to the temperature of between 400 and 600 DEG C, and performing one-step carbonization (synchronous carbonization and activation) for 0.5 to 1.5 hours; and (5) cooling, washing and drying the activated carbide to obtain the active carbon. The method improves the performance of the active carbon, reduces the preparation cost of the active carbon, and realizes recycling utilization.
Owner:CHENGDU UNIV OF INFORMATION TECH

Preparation method and application of nitrogen-doped porous carbon nano sheet composite material

The invention discloses a preparation method of a nitrogen-doped porous carbon nano sheet composite material. The preparation method comprises the steps of performing high-temperature carbonization treatment on a mixture which consists of melamine and adjacent phenanthroline iron and serves as a precursor in a tubular furnace under an inert gas environment, and then removing dissolved iron compounds from an acidic solution to obtain a porous carbon nano sheet layer with carbon-coated iron carbide nano particles. The preparation method has the advantages that the technology is simple, the raw materials are cheap, and operation is easy to implement; in the prepared composite material, iron carbide is uniformly dispersed in the carbon nano sheet layer, so that the composite material is high in specific surface area and pore volume; iron carbide nano particles are completely coated by graphitized carbon, so that oxidization and corrosion are hardly caused; the composite material is stable in acidic electrolyte, and the battery activity can be effectively improved; when used as an electrocatalyst, the composite material is relatively high in electrocatalysis efficiency; the preparation method has an important value and significance in the field of preparation of doped carbon nano composite materials and electrocatalysis of proton membrane fuel batteries.
Owner:NANKAI UNIV

Two-dimensional porous graphitized carbon-coated nickel-tin alloy material and preparation and application thereof

InactiveCN103722169AImprove controllabilityGood particle dispersionCell electrodesTube furnaceCarbon source
The invention discloses a two-dimensional porous graphitized carbon-coated nickel-tin alloy material and preparation and application thereof. Carbon-coated nickel-tin alloy nano-particles are uniformly embedded into two-dimensional porous graphitized carbon plates to form the material. A preparation procedure for the material includes utilizing NaCl as a dispersing agent and a carrier, dissolving the NaCl in a nickel source and a carbon source, mixing the NaCl, the nickel source and the carbon source, drying the NaCl, the nickel source and the carbon source under a vacuum condition and finely grinding the NaCl, the nickel source and the carbon source to obtain a mixture; placing the mixture and a tin source to be subjected to gas-phase exchange into a tube furnace, and calcining the mixture and the tin source under the protection of inert gas to obtain a calcined product; washing the calcined product to obtain the two-dimensional porous graphitized carbon-coated nickel-tin alloy material. The two-dimensional porous graphitized carbon-coated nickel-tin alloy material, the preparation and the application have the advantages that the preparation procedure is safe and harmless, operation is simple, the yield is high, and the prepared two-dimensional porous graphitized carbon-coated nickel-tin alloy material which is used as a cathode material of a lithium ion battery is high in reversible capacity and cycle stability.
Owner:TIANJIN UNIV

Method for preparing ultra-fine crystal grain tungsten-copper alloy and tungsten-copper alloy

A method to prepare ultra-fine grain tungsten-copper alloy and the tungsten-copper alloy, it belongs to powder metallurgy technology field. The solution of concentrated HNO3 and solution of Cu (NO3)2 will be added into the solution of (NH4)2WO4 at the condition that they are blended, the chemical deposition reaction will occur in the agitator. And then the deposit will be burned and grinded to produce the composite powder of tungsten-copper oxidate. The composite powder will be reduced at low temperature in the pipe furnace, and nanometer tungsten-copper composite powder can be gained, and then they will be pressed to take shape, the pressed compact will be sintered at the protection of H2 and ultra-fine grain tungsten-copper alloy can be gained. The weight percent of copper in a kind of tungsten-copper alloy produced according to the above method is 20%, the relative density of the alloy is 98.0%-99.7%, the average crystal grain size of the tungsten in the alloy is 0.5-1.5 mu m, the electrical resistance of the alloy is 0.035-0.041X10-6omega .m, the heat-transmit index is 200-223W.m-1.k-1. The advantage of it is that. The densification degree of the alloy is high, the tungsten crystal grain is small and uniform, the copper is highly dispersed to compose a compact net. And the flow of it is short, the technology operation is easy and reliable, the production efficiency is high, the energy and production cost is lower, and an industrial production can be carried on according the method.
Owner:UNIV OF SCI & TECH BEIJING
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