250 results about "Elemental carbon" patented technology

Diatomic hydrogen and unsaturated hydrocarbons are produced as reactor gases in a fast quench reactor. During the fast quench, the unsaturated hydrocarbons are further decomposed by reheating the reactor gases. More diatomic hydrogen is produced, along with elemental carbon. Other gas may be added at different stages in the process to form a desired end product and prevent back reactions. The product is a substantially clean-burning hydrogen fuel that leaves no greenhouse gas emissions, and elemental carbon that may be used in powder form as a commodity for several processes.

The invention discloses a sulfide coated particle as well as a preparation method and an application thereof. The sulfide coated particle comprises a core and a shell coating the core, wherein the core is prepared from at least one of metal, oxide, metal hydroxide, metal inorganic salt, elemental carbon or oxysome thereof, carbide, nitride, semiconductor and organic matter; the shell is prepared from metal sulfide. The to-be-coated core is mixed with the metal salt, a reducing agent and a sulfur source with a liquid phase method, metal sulfide is precipitated to the particle surface through in-situ reduction, and uniform, continuous and controllable coating of the core surface with metal sulfide is realized. The coating method is simple, reaction conditions are mild, universality is high,a coating layer is controllable in thickness, complete and uniform, and the sulfide coated particle has quite broad practical application prospect in the fields of electrocatalysis, lithium ion batteries, biomedicine and the like.

A composite material featuring comminuted or otherwise well dispersed and separated nanotubes reinforcing a matrix featuring metal, ceramic and/or polymer. In a preferred embodiment, the nanotubes feature elemental carbon, and the composites can be produced using a molten silicon metal infiltration technique, which may be pressurized or not, for example, a siliconizing or a reaction-bonding process. In this preferred embodiment, carbon nanotubes may be prevented from chemically reacting with the silicon infiltrant by an interfacial coating disposed between the carbon nanotubes and the infiltrant. A reaction-bonded composite body containing even a small percentage of carbon nanotubes possessed a significant increase in electrical conductivity as compared to a reaction-bonded composite not containing such nanotubes, reflecting the high electrical conductivity of the nanotubes. When the nanotubes are well dispersed throughout the preform, mechanical property enhancements start to become noticeable, such as fracture toughness enhancement.

This invention provides a hybrid material that exhibits strength, stiffness and ability to resist high temperatures. This hybrid material essentially consists of component A and component B. Component A is selected from the group consisting of inorganic compounds, oxides, carbides, nitrides, borides, and combinations thereof. Component B is selected from the group comprising elemental carbon, inorganic compounds, oxides, carbides, nitrides, borides, and combinations thereof. Component B comprises a plurality of units, each of the units substantially exhibiting a shape, such that this shape substantially exhibits a long dimension and a short dimension, with the short dimension being in a direction that is essentially perpendicular to the direction of the long dimension and the short dimension being in the range from 0.1 nm to 0.5 μm. Each of the units of component B is substantially in contact with and substantially bonded to at least one of the units of component A.

The present invention is a composite material and process to produce same. That material comprises a fibrous structure which is initially predominantly coated with elemental carbon; that fibrous structure is then subsequently predominantly coated with at least one ceramic material, e.g., boron carbide, which is non-reactive with silicon. The composite material also comprises a silicon matrix which is continuous and predominantly surrounds the fibrous structure, which has been initially predominantly coated with elemental carbon and subsequently predominantly coated with at least one ceramic material. The matrix which has a fine grain crystalline structure of predominantly 20 microns or less in size. The at least one ceramic material is discontinuous within that matrix. The fibrous material pulls out of the elemental carbon, which initially predominantly coats that fibrous structure, when the composite is subjected to fracture.

Active materials of the invention contain at least one alkali metal and at least one other metal capable of being oxidized to a higher oxidation state. Preferred other metals are accordingly selected from the group consisting of transition metals (defined as Groups 4-11 of the periodic table), as well as certain other non-transition metals such as tin, bismuth, and lead. The active materials may be synthesized in single step reactions or in multi-step reactions. In at least one of the steps of the synthesis reaction, reducing carbon is used as a starting material. In one aspect, the reducing carbon is provided by elemental carbon, preferably in particulate form such as graphites, amorphous carbon, carbon blacks and the like. In another aspect, reducing carbon may also be provided by an organic precursor material, or by a mixture of elemental carbon and organic precursor material.

An optimized gasification/vitrification processing system having a gasification unit which converts organic materials to a hydrogen rich gas and ash in communication with a joule heated vitrification unit which converts the ash formed in the gasification unit into glass, and a plasma which converts elemental carbon and products of incomplete combustion formed in the gasification unit into a hydrogen rich gas.

An electrochemical cell is provided which has a liquid anode. Preferably the liquid anode comprises molten salt and a fuel, which preferably has a significant elemental carbon content. The supply of fuel is preferably continuously replenished in the anode. Where the fuel contains or pyrolizes to elemental carbon, the reaction C+2O²⁻→CO₂+4e⁻ may occur at the anode. The electrochemical cell preferably has a solid electrolyte, which may be yttrium stabilized zirconia (YSZ). The electrolyte is connected to a solid or liquid cathode, which is given a supply of an oxidizer such as air. An ion such as O²⁻ passes through the electrolyte. If O²⁻ passes through the electrolyte from the anode to the cathode, a possible reaction at the cathode may be O₂+4e⁻→2O²⁻. The electrochemical cell of the invention is preferably operated as a fuel cell, consuming fuel and producing electrical current.

Sulfur composites and polymeric materials having a high sulfur content and prepared from elemental sulfur as the primary chemical feedstock. The sulfur copolymers are prepared by the polymerization of elemental sulfur with one or more monomers of amines, thiols, sulfides, alkynylly unsaturated monomers, nitrones, aldehydes, ketones, thiiranes, ethylenically unsaturated monomers, or epoxides. The sulfur copolymers may be further dispersed with metal or ceramic composites or copolymerized with elemental carbon, photoactive organic chromophores, or reactive and solubilizing/biocompatible moieties. The sulfur composites and polymeric materials feature the ability self-healing through thermal reformation. Applications utilizing the sulfur composites and polymeric materials may include electrochemical cells, optics, H₂S donors and antimicrobial materials.

The invention discloses a coal-fired boiler coal quality on-line soft measurement method and system. The coal-fired boiler coal quality on-line soft measurement method includes the steps of (S100) the contents of the as received basis ash content Aar, the dry ash-free basis elemental carbon Cdaf and the dry ash-free basis elemental sulphur Sdaf are assumed; (S200) the uncompleted burned carbon consumption correction amount TCucr, the oxygen volume VO2-daf, the nitrogenn volume VN2-daf and CO2 volume gamma CO2, CO2 and SO2 gross capacity VRO2-daf are calculated according to the contents; (S300) iteration solving is carried out on the dry ash-free basis sulphur calculation value Sdafj, the dry ash-free basis carbon calculation value Cdafj and the fuel low-level heating amount calculation value Qarj according to the calculation values in the step (S200), and the values are output. Coal quality on-line soft measurement is achieved through the adoption of fire coal moisture on-line measurement information, boiler smoke data and unit running state data.

A technique of manufacturing glass having fairly clear color and/or high visible transmission is provided. In certain example embodiments of this invention, it has surprisingly been found that by using carbon-containing compound(s) including C_xH_yO_z.mH₂O, excellent melting and refining can be achieved in the manufacture of glass, and not as much ferrous iron is formed compared to the use of elemental carbon as a refining agent. Such compound(s) are especially advantageous when highly transparent clear glass is desired, in that less ferrous iron is formed and thus transmittance and coloration can be improved.

The present invention is a composite material, a process and a product formed by the process. The composite is formed by a process that includes forming a fibrous structure comprising fibers into a preform, coating the fibers of the fibrous structure preform with elemental carbon to impregnate that preform, infiltrating the preform with boron carbide to form an impregnated green body. The impregnated green body is infiltrated with liquid naphthalene or other carbon precursor, which is thereafter pyrolyzed to form a carbon char. Then, the char infiltrated green body is infiltrated with molten silicon to form a continuous matrix throughout the composite. The silicon in the continuous matrix is reacted with the carbon char to form silicon carbide.

Coaxial disk armatures, counter-rotating through an axial magnetic field, act as electrolysis electrodes and high shear centrifugal impellers for an axial feed. The feed can be carbon dioxide, water, methane, or other substances requiring electrolysis. Carbon dioxide and water can be processed into syngas and ozone continuously, enabling carbon and oxygen recycling at power plants. Within the space between the counter-rotating disk electrodes, a shear layer comprising a fractal tree network of radial vortices provides sink flow conduits for light fractions, such as syngas, radially inward while the heavy fractions, such as ozone and elemental carbon flow radially outward in boundary layers against the disks and beyond the disk periphery, where they are recovered as valuable products, such as carbon nanotubes.

An air purification system formed from an adsorptive photocatalytic oxidation device and a method of regenerating the oxidation device is disclosed. The air purification system may be configured to be installed within an air duct of a central air handling system. The air purification system may also include an ultraviolet light emitted by the ultraviolet light source to break down captured volatile organic compounds into elemental carbon dioxide and water vapor, and to irradiate air moving past the ultraviolet light and surfaces to reduce contaminants. The ultraviolet light source may be positioned to expose the adsorptive photocatalytic oxidation device to ultraviolet light emitted by the ultraviolet light source to break down captured volatile organic compounds into elemental carbon dioxide and water vapor, and to irradiate air moving past the ultraviolet light to reduce contaminants.

The invention discloses equipment and a method for automatically detecting mass concentration of organic carbon/elemental carbon in atmospheric aerosol. The method comprises the following steps of: firstly, collecting particles to be detected on a quartz filter film; and heating the quartz filter film loaded with the particles in the environment of He gas, taking the carbon volatilized during the temperature rise as the organic carbon, heating the quartz filter film in the environment of He/O2 carrier gas, during which the elemental carbon is oxidized, decomposed and escapes. Through the whole process, a laser beam is irradiated on the quartz film, the transmission light of the laser beam is weakened in the carbonization of the organic carbon and strengthened in the oxidizing decomposition of the elemental carbon. The dividing point of the organic carbon and the elemental carbon is decided at the time when the transmission light of the laser beam recovers the original optical intensity, namely the carbon detected before the time is taken as the organic carbon, and the carbon detected after the time is taken as the elemental carbon. The equipment consists of the quartz filter film, a combustion furnace, an oxidation furnace, a CO2 detector, and a laser detection unit. The method realizes detecting the mass concentration of the organic carbon/elemental carbon in the atmospheric aerosol more scientifically and accurately.

A process for producing silicon-containing CMC articles. The process entails producing a matrix slurry composition that contains at least one resin binder and a SiC powder. The SiC powder is a precursor for a SiC matrix of the CMC article and the resin binder is a precursor for a carbon char of the matrix. A fiber reinforcement material is impregnated with the slurry composition to yield a preform, which is then heated to form a porous preform that contains the SiC matrix and porosity and to convert the resin binder to the carbon char that is present within the porosity. Melt infiltration of the porosity is then performed with molten silicon or a molten silicon-containing alloy to react the carbon char and form silicon carbide that at least partially fills the porosity within the porous preform. The carbon char constitutes essentially all of the elemental carbon in the porous preform.

The invention discloses orthogonal light path-based equipment for online monitoring the concentration of organic carbon/elemental carbon in PM (Particulate Matter) 2.5. The orthogonal light path-based equipment comprises an on-line sampling unit, a sample processing and detecting unit and an orthogonal light path system, and is characterized in that the sampling unit comprises a vacuum pump, a mass flow controller, a quartz filtering membrane, a ball valve, a volatilizable organic matter denuder, and a PM2.5 cutting head; the sample processing and detecting unit comprises a digestion furnace, an oxidation furnace, a gas path control network, a carrier gas source and a non-deviation infrared detector; the orthogonal light path system comprises a laser, a light beam splitter, a reference light path photoelectric detection unit, a quartz filtering membrane transmission light path photoelectric detection unit and a reflection light path photoelectric detection unit; and three gases of high-purity He, 5 percent O2/He and 5 percent CH4/He are required to be controlled by a gas path valve network by a singlechip. The orthogonal light path-based equipment is capable of simultaneously detecting light intensity values of incident laser, sampled reflected light and transmitted light of the quartz filtering membrane, and relatively accurately achieving the segmentation of the organic carbon and the elemental carbon.

The invention discloses a SiC ceramic structural part and a preparation method thereof. The method comprises the following steps: mixing SiC powder, C powder and adhesive powder, and preparing a ceramic body by SLS (Selective Laser Sintering). Firstly, appropriate grain composition uniform mixed powder is selected for printing forming, and the ceramic body is treated by an isostatic cool pressingtechnology, so that powder particles in the ceramic body are tightly arranged, and the density of the ceramic body is improved; and then, by virtue of siliconizing reaction sintering, SiC is formed byelemental silicon and elemental carbon particles in the sintering process, presence of the elemental silicon in the test piece is reduced, the density of the test piece is further improved by the SiCproduced in the reaction, the porosity of the test piece is reduced, and the mechanical property of the test piece is improved; and when the SiC ceramic is subjected to 3D printing in the method, thepowder C serves as one of the raw materials, the grain composition of the powder C and powder SiC is adjusted, and preparation is made for subsequent isostatic cool pressing and reactive sintering. The structural part prepared by the method disclosed by the invention has the density of 3.01-3.11g/cm<3> and the bending strength of 290-330 MPa.

The active material of the present invention includes at least one alkali metal and at least one other metal capable of being oxidized to a higher oxidation state. Preferred other metals are accordingly selected from transition metals (as defined in groups 4-11 of the periodic table), and certain other non-transition metals such as tin, bismuth and lead. The active material can be synthesized through a single-step reaction or a multi-step reaction. In at least one step of the synthesis reaction, reducing carbon is used as a starting material. In one aspect, the reducing carbon is supplied by elemental carbon, preferably in particulate form such as graphite, amorphous carbon, carbon black, and the like. On the other hand, the reducing carbon can also be supplied from an organic precursor material, or a mixture of elemental carbon and an organic precursor material.

The invention relates to a method for removing pollutants and greenhouse gases SO₂, NO_x, and CO₂ from a flue gas stream, comprising the steps of: a) contacting natural seawater with a flue gas in a counter flow, co-current flow or cross flow direction for a given period of time to remove SO₂ from the flue gas; b) contacting treated alkaline water to the flue gas in a counter flow, co-current flow or cross flow direction to remove CO₂ and NO_x from the flue gas and generate oxygen and carbon particles; and c) collecting or emitting the flue gas after step b). The invention also relates to a system for removing pollutants and greenhouse gases SO₂, NO_x, and CO₂ from a flue gas stream. The method and the system of the invention are significantly more economical and convenient and do not cause harm to the environments. The invention also exhibits a novel and unique feature that elemental carbon and oxygen are generated as final products and can be recovered as an energy source.