58 results about "Graphitic carbon" patented technology

In accordance with the present invention, there is provided a process for producing hydrogen and graphitic carbon from a hydrocarbon gas comprising: contacting at a temperature between 600° C. and 1000° C. the catalyst with the hydrocarbon gas to catalytically convert at least a portion of the hydrocarbon gas to hydrogen and graphitic carbon, wherein the catalyst is a low grade iron oxide.

The invention provides a blank molding assembly block of diamond large single crystals and a plastic growth method, and belongs to the technical field of superhard material synthesis. The blank molding assembly block comprises a mutually-embedded metal catalyst layer formed by mutually embedding a plurality of prismatic table metal catalyst structures, the whole mutually-embedded metal catalyst layer is in a prismatic table shape, one of the upper end face and the lower end face of each prismatic table metal catalyst structure is in contact with the high-purity graphite carbon source layer, and the other one of the upper end face and the lower end face of each prismatic table metal catalyst structure is in contact with the seed crystal; the adjacent prismatic table metal catalyst structures are separated by an insulating layer, and the insulating layer is a Ca coating or a BN coating. A mutually-embedded prismatic-table-shaped metal catalyst structure with an axial temperature gradient and a carbon diffusion channel is constructed in a blank assembly block, diamond is induced to grow in a preset direction in an HPHT environment, directional shaping growth of the diamond is achieved under the condition that the process complexity is not improved, and the quality of the diamond is improved. The crystal morphology controllability, the catalytic agent utilization efficiency and the final drilling rate are remarkably improved, and the single-cavity yield is increased.

A catalyst for a metal-air battery includes a nitrogen-doped graphitic carbon support and atomically dispersed niobium atoms disposed on the nitrogen-doped graphitic carbon support. A positive electrode for a metal-air battery includes a catalyst coated layer comprising niobium atoms and a nitrogen-doped graphitic carbon support. The niobium atoms are atomically dispersed on the nitrogen-doped graphitic carbon support. A metal-air battery includes an negative electrode, an electrolyte, and a positive electrode. The positive electrode includes a catalyst coated layer that includes niobium atoms and a nitrogen-doped graphitic carbon support. The niobium atoms are atomically dispersed on the nitrogen-doped graphitic carbon support.

Graphite carbon brick trepanning equipment comprises a base, a power part, a drilling self-water-inlet connecting part, a drilling assembly, a carbon brick supporting device and a carbon brick pressing device. One end of the drilling self-water-inlet connecting part is installed at the output end of the power part, the other end of the drilling self-water-inlet connecting part is installed on the drilling assembly, and the drilling assembly and the drilling self-water-inlet connecting part are coaxial. The carbon brick supporting device comprises a height adjusting mechanism and a transverse adjusting mechanism; the height adjusting mechanism is installed on the base, and the transverse adjusting mechanism is installed on the top of the height adjusting mechanism. During use, the carbon brick pressing device can press a carbon brick needing to be perforated on the top of the transverse adjusting mechanism from the upper portion, and the carbon brick is prevented from moving; according to the drilling device, the drilling assembly is arranged, then the hole forming position of the carbon brick can be adjusted to be right opposite to the drilling assembly through the height adjusting mechanism and the transverse adjusting mechanism, the end of the drilling assembly is accurately aligned to the position needing hole forming, one-time through hole forming from the single side of the carbon block can be achieved when large-size carbon block drilling is conducted, and the hole forming precision of the carbon block is guaranteed.

The present invention mainly relates to a process for preparing sub-micrometer-sized graphitic carbon nitrides, comprising a step of milling or sonicating graphitic carbon nitrides. The present invention also relates to a sub-micrometer-sized graphitic carbon nitride having a volume size distribution in which the particle size of less than 1 μm dominates more than 50% of a volume of total particles in the suspension.

The invention relates to a preparation method of a secondary ball-milled sulfur-doped phosphorus-carbon negative electrode material and application of the secondary ball-milled sulfur-doped phosphorus-carbon negative electrode material in a sodium-ion battery. The preparation method comprises the following steps: respectively weighing a proper amount of phosphorus source, carbon source and sulfur source according to a certain ball-to-material ratio; the phosphorus source can be selected from red phosphorus or black phosphorus, and the carbon source can be a carbon material with good conductivity and structural stability, such as graphite, carbon nanotubes, conductive carbon black and the like; the sulfur source may be a mixture of an inorganic sulfur source and a sulfur-containing biological agent. The primary ball-milling comprises the following steps: adding a phosphorus source and a carbon source into a ball-milling tank according to a certain proportion, and carrying out ball-milling treatment at a certain rotating speed for a certain time under the protection of inert gas, so that the phosphorus source and the carbon source are fully hybridized to form a phosphorus-carbon bond; and mixing the phosphorus-carbon material obtained by primary ball milling with a sulfur source, uniformly adding the mixture into the ball milling tank, carrying out secondary ball milling treatment at a certain rotating speed for a certain time under the protection of inert gas, and gradually dispersing and doping the sulfur source into the phosphorus-carbon system in the process to form the sulfur-doped phosphorus-carbon negative electrode material.

The application relates to the technical field of electrocatalysis, in particular to a preparation method and application of a bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst, which comprises the following steps: S1, adding urea and ammonium chloride into water, stirring, freeze-drying, grinding, and obtaining a chelating ligand; S2, adding bismuth citrate into the chelating ligand, carrying out a solid-phase reaction, and obtaining a precursor; and S3, calcining the precursor under nitrogen protection, and obtaining the bismuth nanocrystal / nitrogen-rich graphite carbon electrocatalyst. The problems that reduction and reconstruction reactions are prone to occur in the process of catalyzing CO2 electrocatalytic reduction, and the difficulty in increasing the recognition and performance regulation of active sites can be solved.

Carbon-based composite materials are provided, such as those comprising at least 80 weight % of graphitic carbon comprising functional groups capable of forming hydrogen bonds, the graphitic carbon in the form of a mat of randomly entangled elongated structures; not more than 20 weight % of a polymer or a nanofiber thereof, dispersed within the graphitic carbon, the polymer or the nanofiber thereof comprising corresponding functional groups capable of forming hydrogen bonds with the functional groups of the graphitic carbon; and a plurality of hydrogen bonds at an interface formed between the graphitic carbon and the polymer or the nanofiber thereof, the plurality of hydrogen bonds formed between the functional groups of the graphitic carbon and the corresponding functional groups of the polymer or the nanofiber thereof.

An anode material for a lithium ion battery comprises a carbonaceous silicon composite material. The composite material comprises Si nanoparticles, and nanostructured and microporous graphitic carbon and / or silicon carbide, wherein the graphitic carbon and / or silicon carbide are derived at least in part from carbonized metal organic framework.

The application provides an aromatic hydrocarbon oil for mesophase pitch and a preparation method and application thereof. The preparation method comprises the steps of purification, refining, reforming, conversion and purification. The method can convert and purify heavy residual oil into aromatic hydrocarbon oil with high aromatic hydrocarbon content, and the obtained aromatic hydrocarbon oil has narrow molecular weight distribution interval, low ash content and low sulfur content. The mesophase pitch prepared by using the aromatic hydrocarbon oil through different processes has high mesophase content, uniform molecular weight distribution, good large streamline body configuration of mesophase morphology, low ash content and sulfur content, suitable softening point and good spinnability, and is applied to the preparation of carbon fiber or graphite carbon foam and other carbon materials, and has excellent performance. Moreover, the equipment used in the method is all conventional industrial production equipment, so that the equipment investment and production difficulty of related enterprises for converting production of the aromatic hydrocarbon oil can be greatly reduced.

Liquid admixtures including three-dimensional graphene (3DG carbons) for cementitious materials including high performance concrete formulations. The 3DG carbons may include a carbon-based material including flaky graphene and nodular graphene. The 3DG carbons may include three-dimensional graphene flakes and amorphous graphitic carbon. A concentration of 3DG carbons in the liquid admixture may be less than approximately 100 g / liter. Concrete compositions including 3DG carbons. The compressive strength of an example concrete composition including 3DG carbons and measured using ASTM C39 at a hydration period of 28 days may be at least 55 MPa.

A method of increasing porosity of graphitic carbon black comprises combining graphitic carbon black having a Raman planar size (La) of at least 20 Angstroms with at least 100 ppm of an alkaline earth element selected from strontium, barium, and a mixture of both to form a mixture, and contacting the mixture with an etchant at a temperature of 900-1400° C. until 2%-85% of the mass of the carbon black is lost.

The invention discloses a composite refractory material blast furnace skimmer and a preparation method thereof. The blast furnace skimmer is prepared from sintered corundum, brown corundum, white corundum, chromic oxide or activated aluminum oxide, zirconium oxide or boron carbide, metal chromium powder or metal aluminum powder, squamous graphite, silicon carbide, silicon carbide, aluminum oxide fibers, polypropylene explosion-proof fibers, high-temperature asphalt powder and a polyphosphate dispersing agent in different specifications. The preparation method comprises the following steps: respectively preparing a powdery raw material and a liquid raw material according to the raw material ratio; and mixing the powdery raw material and the liquid raw material, pouring and molding, and then air-drying, drying and sintering to obtain the product. The blast furnace skimmer provided by the invention has relatively high strength, slag corrosion resistance, scouring resistance, oxidation resistance and thermal shock resistance, and the service life of the blast furnace skimmer is greatly prolonged.

The present disclosure relates to the technical field of nano materials and aims to provide to a method for preparing nano-graphene oxide by electrochemically exfoliating a carbon fiber material. The method includes the following steps: building an electrochemical reaction system by using a raw material with a carbon fiber as a basic structural unit as an anode, a metal or graphitic carbon material as a cathode, and a phosphate buffer solution with a neutral pH as an electrolyte; in an electrolysis process, gradually exfoliating a carbon fiber in the anode raw material and dispersing the carbon fiber in the electrolyte solution to generate graphene oxide; centrifuging to separate the reacted electrolyte solution, taking upper dispersion liquid, and washing away residual anions and cations; and performing ultrasonic treatment to obtain nano-graphene oxide dispersed in water and free of impurities.

We disclose here the nano-enabled delivery of highly potent 5-hydroxymethyl furfural (5-HMF) to sickled blood cells in patients. 5-HMF, a superior antisickling agent, has been formulated to address the limitations of existing treatment modalities arising from disfavorable pharmacokinetics of the drug compound. Specifically, two complementary 5-HMF prodrugs are integrated as a ‘protected’ biocompatible composite nanoparticle designed to readily fuse with RBCs and be amenable to transdermal delivery (5-HMF-grafted-phospholipid layered over a sucrose-derived graphitic carbon dot core). These RBC-targeted, protected, biocompatible, self-assembled 5-HMF prodrug nanoparticles for sickle cell disease are the first in class technology for offering a treatment for sickle cell disease which has improved potency, targeted payload delivery, and extended release with the red blood cells with enhanced pharmacodynamic effect in a treated patient.

A process for producing hydrogen and graphitic carbon from a hydrocarbon gas includes contacting at a temperature between 600° C. and 1000° C. the catalyst with the hydrocarbon gas to catalytically convert at least a portion of the hydrocarbon gas to hydrogen and graphitic carbon, wherein the catalyst is a low grade iron oxide.

The present application relates to iron-making technology field, propose a kind of for vanadium-titanium magnetite smelting blast furnace hearth structure and cooling control method, the blast furnace structure includes furnace bottom brick lining, hearth side wall brick lining and be located in the hearth side wall brick lining below furnace base;Furnace bottom brick lining and the outside of the hearth side wall brick lining is provided with smooth cast iron cooling wall, the inside of the furnace base is provided with cooling device;The furnace bottom brick lining is successively provided with heat preservation brick layer and heat-conducting brick layer from hearth bottom to furnace base direction, heat preservation brick layer includes dense clay brick and composite mullite brick, the heat-conducting brick layer is semi-graphite carbon brick;Hearth side wall brick lining is built with the composite mullite brick, and in the corner of hearth and furnace bottom, hearth side wall brick lining extends to form brick lining reinforcing structure in the direction of furnace in.The present application solves the problem of excessive deposition of titanium carbonitride caused by improper temperature gradient when smelting vanadium-titanium magnetite, inhibits the accumulation of hearth center and edge bonding, maintains the hearth active and blast furnace smooth.

The invention relates to the field of sodium ion battery manufacturing, in particular to a preparation method of a glucose and magnesium gluconate hard carbon composite material, which comprises the following steps: S1, glucose solution preparation: dissolving 1-10g of glucose in 10-100ml of deionized water; s2, a magnesium gluconate solution is prepared, wherein 1-5 g of magnesium gluconate is taken and dissolved in 10-100 ml of deionized water; s3, mixing glucose and the magnesium gluconate solution at normal temperature, and magnetically stirring for 1-10 hours; s4, pouring into a reaction kettle for hydrothermal reaction. Glucose and a magnesium gluconate solution are mixed to prepare hydrothermal carbon, the hard carbon material is formed after two times of carbonization, glucose can form a graphite-like carbon layer structure in the carbonization process, magnesium gluconate generates magnesium oxide in the reaction process, magnesium oxide serves as a template agent to further form a microporous structure, and the hard carbon material is prepared. The proportion of the graphite-like carbon to the microporous structure is controlled by adjusting the carbonization temperature, so that the transportation path of sodium ions is improved.

The present application relates to the technical field of electrocatalytic materials, in particular to a heterogeneous structure catalyst for reducing nitrate and a preparation method and application thereof, the catalyst comprises a porous graphite carbon carrier and a heterogeneous structure formed by iron monatomic atoms and iron nanoclusters supported on the carrier, wherein the iron monatomic atoms and the iron nanoclusters are formed by in-situ pyrolysis of triruthenium dodecacarbonyl precursor on the carbon carrier, realizing synergistic catalysis of different functional sites, thereby improving ammonia yield and Faraday efficiency, and providing a general technical strategy for designing heterogeneous structure active sites to accelerate series electrocatalytic reactions.

This application provides a conductive carbon black, its preparation method, a shielding material, and a high-voltage cable. The preparation method includes the following steps: mixing a structure-modifying liquid precursor with water to obtain a structure-modifying liquid; the structure-modifying liquid precursor includes at least one of dopamine hydrochloride, tannic acid, citric acid, and tartaric acid; using the structure-modifying liquid to wet-granulate powdered conductive carbon black to obtain wet conductive carbon black particles; and sequentially drying, sieving, and calcining the wet conductive carbon black particles to obtain conductive carbon black. The preparation method of this application first coats the surface of powdered conductive carbon black with a polyhydroxy polar structure-modifying liquid through wet granulation, forming an in-situ coating layer to prevent the conductive carbon black from agglomerating due to electrostatic adsorption, resulting in conductive carbon black with excessively high structure; and then, through drying and calcination, transforms the polar coating layer into a highly ordered graphitic carbon coating layer, thereby effectively improving the electrical properties of the conductive carbon black.

The invention discloses a polyacrylonitrile carbon fiber graphitization production line, a polyacrylonitrile carbon fiber graphitization method and graphite carbon fibers, the polyacrylonitrile carbon fiber graphitization production line comprises a yarn withdrawing frame, a desizing furnace, a passivation furnace, a graphite furnace, a surface treatment machine, a washing machine, a sizing machine, a drying furnace and a winding machine which are arranged in sequence, and the graphite furnace comprises a main graphite furnace and a standby graphite furnace. The two graphite furnaces are adopted, one graphite furnace is used, and the other graphite furnace is standby, when one graphite furnace is overhauled, polyacrylonitrile carbon fibers can be graphitized through the other graphite furnace, the operation cycle of graphite lines can be prolonged, the yield of the graphite carbon fibers is further increased, the situation that domestic M40-grade and M46-grade high-modulus carbon fibers are short of supply can be effectively relieved, and the service life of the graphite fibers is prolonged. And meanwhile, single-line profits are brought to carbon fiber enterprises every year.

Described herein are thermoplastic prepregs comprising an organic polymer matrix and a carbon fiber substrate. The polymer matrix comprises a polyphenylene polymer as described below. The thermoplastic prepregs are particularly suited for carbon-carbon composites ("C / C composites"). In particular, the polyphenylene polymers described herein provide improved C / C composites both structurally and based on processing efficiency, at least in part due to significantly increased carbon yield and conversion to laterally ordered graphitic carbon during pyrolysis. Also described herein are methods for making thermoplastic prepregs and green bodies, and C / C composites made therefrom.

A composite material according to the present disclosure comprises a carbon-sulfur composite and a protective layer formed on a surface of the carbon-sulfur composite. The carbon-sulfur composite contains a porous carbon material and a sulfur material supported by the porous carbon material. The protective layer contains at least one of non-graphitic carbon and a carbon precursor as a main component, and has a film thickness of 1.0 nm or more and a crystallite size Lc of 1.0 nm to 4.0 nm.

A method for producing a graphene-based precursor comprises providing graphene flakes based on one or more predetermined criteria, wherein at least some of the graphene flakes have lattice defects, modifying the graphene flakes by treating at least some of the graphene flakes with non-graphene carbon structures to form modified graphene flakes, and crumpling the modified graphene flakes to form graphitic carbon mesostructures.

The application relates to a method for producing at least a carbon product by a chemical reaction with a catalyst. The method comprises: arranging a reactant into contact with the catalyst, which is formed of Fe-based material, for performing a thermocatalytic decomposition reaction in a reactor, performing the reaction at a temperature of 550-1000 °C in the reactor to form the carbon product comprising at least graphitic carbon, wherein the graphitic carbon contains at least particles with a flake structure, and recovering at least the carbon product comprising the graphitic carbon.

This invention discloses a high-density, low-corrosion, solids-free drilling and completion fluid, its preparation method, and its application. The high-density, low-corrosion, solids-free drilling and completion fluid comprises the following raw materials in the indicated mass percentages: 0.5-3.0 wt% N,P co-doped carbon quantum dot corrosion inhibitor, 0.5-2.0 wt% scavenger, 1.0-5.0 wt% lubricant, 0.5-2.5 wt% stabilizer, 45.0-65.5 wt% weighting agent, and 22.0-52.5 wt% deionized water. This invention is the first to use N,P co-doped carbon quantum dots as a corrosion inhibitor in the preparation of drilling and completion fluid. This N,P co-doped carbon quantum dot corrosion inhibitor contains sp... 2 The graphitic carbon, heteroatom nitrogen, and heteroatom phosphorus can form a protective film on the metal surface through physicochemical adsorption, exhibiting significant corrosion inhibition effects against various soluble salt solutions. It also demonstrates excellent corrosion inhibition performance under high-saltification and high-temperature, high-pressure conditions. This invention also provides a method for applying this drilling and completion fluid, enabling precise control and dynamic adjustment of the dosage of N,P co-doped carbon quantum dot corrosion inhibitor during on-site well completion operations.

The application relates to the technical field of friction materials, and particularly discloses a carbon-tao-copper alloy powder metallurgy sintering friction material and a preparation method thereof. The raw material of the friction material is mainly composed of the following components in volume percentage: 39.4-45.9% of a carbon component; 24.2-28.4% of a ceramic component; and 25.7-36.4% of a metal component. The carbon component is composed of graphite, carbon fiber powder and petroleum coke; the graphite is composed of natural flaky graphite and artificial granular graphite, the particle size specification of the artificial granular graphite is 30-50 mesh, 50-100 mesh and 100-200 mesh; the ceramic component is composed of zirconite sand, alumina, quartz powder, zirconium dioxide, silicon carbide and potassium feldspar powder; and the metal component is composed of copper powder, tin powder, zinc powder, nickel powder and iron powder. In the application, the proportion of the carbon and ceramic components is increased, and the proportion of the metal component is reduced; the specific operation of limiting material mixing, green compact pressing and sintering forming and the like processes is adopted, so that the friction material is light in weight, the friction coefficient is more stable, the dynamic and static friction coefficients are close to each other, the friction material can withstand high energy and thermal load, and the wear-resistant service life is long.

To provide a process for producing hydrogen and graphitic carbon from a hydrocarbon gas.SOLUTION: There is provided a process comprising contacting, at a temperature between 600°C and 1000°C, a catalyst with a hydrocarbon gas to catalytically convert at least a portion of the hydrocarbon gas to hydrogen and graphitic carbon, wherein the catalyst is a low grade iron oxide. Also there is provided a method for the beneficiation of catalytic metal containing ore, the method comprising contacting, at a temperature between 600°C and 1000°C, the catalytic metal containing ore with a hydrocarbon gas to form a carbon-coated metal species.SELECTED DRAWING: None

The invention discloses a composite catalyst for preparing graphite-like carbon by cracking carbon-rich natural gas and an application method of the composite catalyst, and belongs to the technical field of catalyst materials. The composite catalyst is composed of a metal matrix, a catalytic induction phase and an interface regulation phase. The catalytic induction phase is a reversible valence metal compound, and the interface regulation and control phase is selected from at least one of metal halide salt or metal carbonate. The preparation method comprises the following steps: heating a metal matrix in an inert atmosphere until the metal matrix is molten, adding a catalytic induction phase, uniformly dispersing, adding an interface regulation phase, uniformly mixing, and cooling to obtain the composite catalyst. The application method comprises the following steps: arranging a high-temperature-resistant sealed reaction section at a target production layer of a shaft, and filling the reaction section with a composite catalyst; heating to convert the composite catalyst into a molten state, and then introducing the carbon-rich natural gas into a reaction section, so that the carbon-rich natural gas is in full contact with the molten catalyst to generate cracking reaction. The composite catalyst provided by the invention overcomes the problems of easy inactivation, uncontrollable carbon structure, many side reactions and the like of the traditional catalyst.

This invention provides a process and equipment for recovering valuable components from cathode carbon blocks using binary molten salt-assisted roasting, relating to the field of solid waste treatment and resource recycling technology. The process includes the following steps: Step S1: The aluminum electrolysis cathode carbon blocks are coarsely crushed using a crusher, then pulverized using a ball mill, sieved, and dried in an oven for later use. Step S2: Analytical grade sodium chloride and carbonate are mixed according to a specific mass ratio. The mixed salt is placed in a muffle furnace and heated for a period of time to form a uniform binary eutectic molten salt. After cooling, it is ground into a fine powder using an agate crucible for later use. This solution ultimately achieves efficient removal of toxic impurities such as fluorides and cyanides from waste cathode carbon blocks in aluminum electrolysis cells and resource recovery of valuable components such as graphite carbon by innovatively employing a sodium chloride-sodium carbonate binary molten salt system assisted by low-temperature roasting, combined with subsequent water leaching and hydrothermal acid leaching treatment steps.