41results about How to "Good degree of graphitization" patented technology

The invention discloses an arc plasma torch preparing nanometer charcoal fibrous material method, which comprises the following steps: placing untreated leavings of liquefying coal directly in direct current arc plasma torch to carry on heat-treatment; using nitrogen for arc working gas under atmosphere pressure; getting nanometer charcoal fibrous material after 120-175 seconds, wherein there is no need to add in any activators in preparing process. The method is characterized by the following: the craft route is simple; the raw material is the waste of coal hydrogenant liquefaction craft; it's a good way to use coal liquification leavings to prepare high-added value, functional carbon material; the nanometer charcoal fibrous material can be used for accelerating agent, catalyst carrier, lithium ion secondary cell anode material, double-layer capacitor electrode, highly effective active solid, release agent and construction reinforced materials.

The invention provides a graphene-carbon nano composite transparent conducting thin film and a preparation method thereof. The graphitization degree of the graphene-carbon nano-composite thin film prepared by the steps of adding various char formation precursors to graphene oxide dispersion liquid and then carrying out thermal reduction is obviously increased, and thus the electric conduction performance of the thin film is substantially improved, and the light transmittance of the film is not affected. In addition, compared with the pure graphene thin film, the film has the advantages that the roughness is less than 0.2nm, and the evenness is high. The preparation method provided by the invention is simple in technology; reagents used in the preparation method have a mild property; and the preparation method can be applied to the large-scale production and has a very good application prospect in the field of photoelectricity such as touch screens, solar cells and light emitting diodes.

The invention belongs to the field of electrochemistry catalysis, and discloses a preparation method of an atomic dispersion non-noble metal fuel battery cathode catalyst. The method comprises the following steps: (a) heating and dissolving alginate into an alginate solution, keeping a heating temperature, adding metal salts into the alginate solution, and generating an alginate chelate solution; (b) adding organic nitride into the alginate chelate solution, enabling the organic nitride and the alginate chelate solution to react, and drying a product after reaction by steaming to obtain a powdered compound; and (c) successively performing primary heat treatment, acid pickling and secondary heat treatment on the powdered compound, thus obtaining the needed catalyst. By virtue of the preparation method, the catalyst with high activity in an acid medium is prepared, and active sites are uniformly dispersed and fixed, so that the preparation method is easy in control and regulation and suitable for large-scale production and application.

The invented catalyst is a Fe/Mo/MgO, Co/Mo/MgO and Ni/Mo/MgO three-phase metal oxide catalyst for preparing bundled multi-wall nano carbon tube. The catalyst is made up by using oxide formed from magnesium and molybdenum as main catalyst and using iron or cobalt or nickel as co-catalyst. Its preparation method includes the following steps: firstly, according to the mole ratio of Fe or Co or Ni:Mo:Mg=0.1-1:0.5-2:0.8-3 uniformly mixing their alkoxides, combustion at 600-700 deg.C and heat-insulating for 10-40 min., cooling formed solid and grinding it or drying the formed solid at 80-150 deg.C, heat-insulating for 10-40 min., then cooling formed solid and grinding it.

The present invention relates to a metal oxide catalyst and a method for preparing bundled multiwall nano carbon tube by using said metal oxide catalyst and catalytic cracking methane, said metal oxide catalyst is the Fe/Mo/MgO and Ni/Mo/MgO catalyst formed from oxide of magnesium and molybdenum as main catalyst and iron or nickel as auxiliary catalyst. Said catalyst is placed in the fixed bed gas continuously-flowing reaction furnace, and the methane whose introduced flow rate is 50-1500 sccm and the hydrogen gas or nitrogen gas or inert gas whose flow rate is 50-300 sccm are reacted for 10-100 min. at 750-1200 deg.C so as to form the invented bundled multiwall nano carbon tube.

The invention discloses a carbon micro-tube epoxy resin wave-absorbing composite material and a preparation method thereof, and relates to a wave-absorbing composite material and a preparation method thereof. The invention solves the problems that the existing active carbon fiber epoxy resin composite wave-absorbing material has fussy preparation process and large density, the hollow fiber prepared by a spinning method has low elastic modulus and the wave-absorbing material has poor strength. The composite material is prepared from carbon micro-tube and epoxy resin glue. The method comprises the following steps of: preparing the carbon micro-tube by using urea and ethylene glycol; preparing the epoxy resin glue by using bisphenol A epoxy resin, acetone and diethylenetriamine; and adding the carbon micro-tube into the epoxy resin glue, stirring the mixture uniformly, then adding the mixture into a die, and pressing the mixture to obtain the composite material. The elastic modulus of the material is 10 to 20GPa, the density is 1.00 to 1.05g/cm<3>, the lowest reflectivity is -13.25dB, the band width of -10dB reflectivity is 3.1GHz, and the material can be used for hiding weapons and eliminating the harm of electromagnetic wave to the organism.

The invention discloses a hollow carbon fiber felt epoxy resin composite material and a preparation method thereof, relates to a carbon fiber epoxy resin composite material and the preparation method thereof, and aims to solve the problems of high density of a conventional carbon fiber epoxy resin composite material and difficult three-dimensional weaving of the carbon fiber serving as a composite material reinforcement. The hollow carbon fiber felt epoxy resin composite material is prepared from a hollow carbon fiber felt and epoxy resin adhesive; and the method comprises the following steps of: placing urea and carbon powder in a graphite crucible; preparing the hollow carbon fiber felt in an atmosphere sintering furnace; placing the hollow carbon fiber felt in a mould; sealing the mould and pouring the epoxy resin adhesive consisting of bisphenol A epoxy resin, acetone and diethylenetriamine into the mould under vacuum; and pressing the mould and drying the mould under vacuum to obtain the hollow carbon fiber felt epoxy resin composite material. The hollow carbon fiber felt is self-woven and the density of the composite material is only 0.92 to 0.94g/cm<3>, so the material can be used for spacecrafts, artificial satellites, space shuttles and missiles.

The invention belongs to the technical fields of metal thermal reduction reactions and graphene materials, and particularly discloses a method for reducing carbon dioxide into a porous carbon material, and the porous carbon material and application thereof. The method comprises the following specific steps: carrying out heat treatment on magnesium-containing metal in a CO2-containing atmosphere; after a reaction is finished, stirring an obtained product in an HCl solution; and purifying the obtained mixture, and carrying out drying overnight at room temperature to obtain the porous carbon material. The specific surface area of the porous carbon material prepared from the magnesium-zinc mixture can reach 1800-2000 m<2>/g; the conductivity of the material is as high as 1000 to 1100 S/m; thecapacitance retention rate is high; the tap density of the material is almost the same as the tap density of activated carbon and is 0.60-0.65 g/cm<3>; so the porous carbon material is an ideal material for preparing a high-power electrochemical capacitor electrode. The porous carbon material prepared from the magnesium-copper mixture has the advantages of favorable specific surface area and goodcrystallinity, and is an ideal material for preparing electrodes of microbial fuel cells.

The invention relates to a preparation method for a biomass-based nitrogen-doped thin layer graphitized carbon material. The method is characterized by comprising the following steps that 1) lignin isused as a carbon source, through a nitration reaction, nitryl is introduced into lignin functional groups, then nitryl is reduced into amidogen, and nitrogen-doped lignin is obtained; 2) nitrogen-doped lignin is carbonized in an inert atmosphere; 3) the nitrogen-doped thin layer graphitized carbon material is obtained through a chemical insertion layer method. The nitrogen-doped thin layer graphitized carbon material has a high graphitized degree and a thin graphite layer, the synthesis method is easy, renewable lignin is used as the carbon source, and the material is environmentally friendlyand sustainable.

A method for preparing a graded mesoporous carbon nanocomposite nickel oxide material includes the following steps: (1) dissolving sodium lignosulfonate in deionized water, and performing ultrasonic dissolution; (2) putting isopropanol in an ultrasonic water bath, injecting a solution obtained in step (1) into the isopropanol by means of an automatic sampler to obtain suspension liquid of lignin microspheres, and centrifugally drying a product in vacuum to obtain lignin nanosphere powder; (3) calcinating the dried lignin nanosphere powder in an N2 atmosphere in a tubular furnace to obtain graded mesoporous carbon nanospheres; (4) putting HMPC NSs into a sodium hydroxide and nickel nitrate solution for reaction to obtain HMPC NSs (Ni(OH)2/HMPC NSs) coated with nickel hydroxide; (5) calcinating the Ni(OH)2/HMPC NSs in an N2 atmosphere in the tubular furnace. The lignin is a graded mesoporous carbon source and has a larger specific surface area.

The invention discloses a few-layer graphite material, a preparation method of the few-layer graphite material, an electrode material and a battery, relates to the technical field of graphite materials, and aims to solve the problem of relatively low discharge capacity of a battery taking a graphite material as an electrode material. The preparation method of the few-layer graphite material comprises the step of stripping a graphite material in a high-energy collision mode to obtain the few-layer graphite material. The method is used for preparing the electrode material in the battery.

The invention discloses a method for preparing an oxygen reduction catalyst from biomass and a product. The method comprises the following steps: S1, mixing biomass with a transition metal salt solution I, and performing freeze-drying to obtain a mixture I; S2, pyrolyzing the mixture I in an inert atmosphere to obtain a core-shell structure material with transition metal nanoparticles wrapped by agraphite carbon layer; S3, dispersing the core-shell structure material into a volatile organic solvent, adding a nitrogen-containing organic matter and a transition metal salt solution II, performing mixing and drying to obtain a mixture II; and S4, pyrolyzing the mixture II in an inert atmosphere so as to grow nitrogen-containing carbon nanofibers on the surface of the core-shell structure material, and washing, filtering and drying the nitrogen-containing carbon nanofibers to obtain the required oxygen reduction catalyst. The sea urchin-shaped oxygen reduction catalyst can be prepared, hasdeveloped porosity, high nitrogen content and stable metal active sites, and has good activity and durability in the aspect of oxygen reduction catalysis.

The invention discloses a preparation method and application of a novel carbon and silicon-based composite material. The method comprises the following steps: mixing saccharose and silicon powder; primarily drying for 8-12h under room temperature; roasting for 2-3h in nitrogen atmosphere under 773-1473K to obtain a primary carbon-silicon composite material; combining the primary carbon-silicon composite material and graphite fibers to obtain the carbo and silicon-based composite material. The preparation method is low in cost, simple to operate, and wide in raw material source; generation of toxic gas is avoided in the preparation processes; in addition, the prepared carbon-silicon-based composite material is stable in performance and outstanding in circulating performance when being applied to a lithium battery negative electrode material and has a god industrial application prospect.

The invention discloses a method for preparing a lanthanum doping monometallic catalyst, which is used in making the uniform caliber carbon nanometer tube. The catalyst uses magnesia as the carrier, uses the oxide of cobalt, iron or nickel as the metal oxide component, uses the oxide of lanthanum as the doping component, and uses the oxide of molybdenum as the catalytic promoter. The method comprises: a) dissolving the magnesium salt in the distilled water, b) adding the metal oxide component, the lanthanum doping component salt and the catalytic promoter, making them dissolved absolutely, wherein the molar ratio of the four is: 0.5~3.0:0.1~1.0:0.01~1.0:0.5~3.0, c) drying said solution in 120-200 DEG C for 3-5 hours, calcining in 550-850 DEG C for 10-30 minutes, d) grinding them to powder and getting the catalyst, which can be used for producing the carbon nanometer tube with uniform caliber.

The invention discloses an iron-containing monatomic catalyst and application thereof. The iron-containing monatomic catalyst is in a monodisperse spherical shape, the surface is smooth, the diameter is 40 nm +/-1 nm, and the uniform spherical shape of matrix resin is inherited, which shows that phenolic resin spheres are ideal precursors for producing carbon materials. The preparation method comprises the following steps: dispersing 3-aminophenol and hexamethylenetetramine in water, and reacting at 100 DEG C for 24 hours by taking hexadecyl trimethyl ammonium bromide as a morphology guiding agent to obtain phenolic resin spheres; and stirring the obtained phenolic resin spheres and an iron salt solution at normal temperature for 12-24 hours at the stirring speed of 200rpm, centrifuging, taking the precipitate, freeze-drying, carbonizing the freeze-dried product in an inert atmosphere, and preserving heat for 60 minutes. Compared with the prior art, the method disclosed by the invention is simple to operate and easy for large-scale production, and the prepared carbon nanosphere loaded iron monatomic material has the advantages of maximized atom utilization rate, unique electronic structure, good conductivity, high catalytic activity and the like.

The invention discloses an in-situ carbon-containing refractory castable, which comprises a component A and a component B. The component A is composed of refractory raw material corundum particles, sintered magnesia, activated alumina micropowder, calcium aluminate cement and silica micropowder, and the component B is a transition metal in-situ doped polymer solution. The transition metal in-situdoped polymer aqueous solution is added into the raw materials, so that on one hand, the raw material mixture of the refractory castable is endowed with fluidity in the preparation process, and on theother hand, the polymer is pyrolyzed to produce a carbon material in the sintering process, the carbon material is dispersed and distributed in the castable, meanwhile, the graphitization degree of the in-situ generated carbon material is improved through transition metal, and according to the in-situ synthesis theory, the carbon material in the in-situ carbon-containing refractory castable has good dispersity, the non-wetting characteristic of carbon material slag can be brought into play, and the carbon-containing refractory castable is endowed with excellent mechanical properties and erosion resistance. The invention further provides a preparation method of the in-situ carbon-containing refractory castable, the technological process is simple, and industrial production is facilitated.