41 results about "Methane decomposition" patented technology

A method for producing a hydrogen enriched fuel includes the steps of providing a flow of methane gas, and providing a catalyst. The method also includes the steps of heating the catalyst instead of the reactor walls and the methane gas using microwave irradiation at a selected microwave power, directing the flow of methane gas over the catalyst, and controlling the microwave power to produce a product gas having a selected composition. A system for producing a hydrogen enriched fuel includes a methane gas source, a reactor containing a catalyst, and a microwave power source configured to heat the catalyst.

A method for producing a hydrogen enriched fuel and carbon nanotubes includes the steps of providing a flow of methane gas, and providing a catalyst mixture comprising a Fe based catalyst and carbon. The method also includes the steps of pretreating the catalyst mixture using microwave irradiation and exposure to CH4, heating the catalyst mixture and the methane gas using microwave irradiation at a selected microwave power, directing the flow of methane gas over the catalyst mixture, and controlling the microwave power to produce a product gas having a selected composition and the carbon nanotubes. For producing multi walled carbon nanotubes (MWNTs) only a flow of methane gas into the reactor is required. For producing single walled carbon nanotubes (SWNTs), a combination of hydrogen gas and methane gas into the reactor is required.

The invention discloses a method for producing hydrogen by catalyzing methane cracking with activated carbon as a catalyst. According to the method, a gas-solid phase catalytic reaction fixed bed reactor is adopted, methane is taken as a raw material, a trace amount of hydrogen sulfide is added, activated carbon is taken as a catalyst, a reaction is carried out at the temperature of 900-950 DEG Cunder normal pressure, products hydrogen and carbon are obtained, and the concentration of hydrogen sulfide is 100 ppm-300 ppm. The trace amount of hydrogen sulfide is added into the methane raw material gas, so that the activity of the activated carbon for catalyzing methane cracking to produce hydrogen is improved, the inactivation time of the activated carbon catalyst is prolonged, and the method has important industrial application value for improving the conversion efficiency of the activated carbon for catalyzing methane cracking to produce hydrogen.

The invention discloses a fixed bed coal seam gas non-catalytic deoxidization method and a fixed bed coal seam gas non-catalytic deoxidization device. The device comprises a fixed bed coal seam gas deoxidization device body including a furnace body (1), wherein the side wall of the furnace body (1) is provided with a water jacket (2) enclosing the side wall of the furnace body; the upper part of the water jacket (2) is connected with an air inlet of a steam pocket (23) through a pipeline; and a water inlet pipe on the lower part of the water jacket is connected with a water outlet of the steam pocket (23). The device deoxidizes the coal seam gas, can effectively control the deoxidization temperature and reduce the oxygen content in the coal seam gas to less than 0.5 percent, and maximallyreduces methane decomposition to make the methane loss less than 5 percent.

The invention discloses a hydrogen production reactor device with a gas replacement and efficient methane cracking carrier. The hydrogen production reactor device comprises a protection tube, a quartz tube, a diffuser, a supporting plate, an electric heater, a heat preservation layer, a nitrogen storage tank, a methane storage tank, a hydrogen storage tank, a spiral tube, a flow meter, a connecting base B, a carbon discharging mechanism, a connecting base A, a control circuit board and a catalyst which are installed together, wherein the methane cracking carrier is one of molten salt and fused salt. According to the invention, hydrogen is produced by gradually cracking methane, air in the hydrogen production reactor is replaced by gas, compared with a vacuum pump for pumping gas, the structure is simple, the equipment investment cost is reduced under the condition that the amount of carbon dioxide is reduced, the methane cracking carrier is selected as a molten alloy or a molten salt substance, and the methane cracking temperature can be reduced. Due to the catalytic activity of the methane cracking carrier, the hydrogen production rate of the cracked methane is better than that of the original liquid tin serving as a cracking carrier. The methane vent hole of the diffuser is designed to be a round hole, so that the gas inlet inhibition effect is avoided, the methane gas inlet rate is increased, and the productivity is improved.

The invention belongs to the fields of energy and chemical industry, particularly provides a method for producing light tar by catalyzing and corefining low-rank coal and methane, and mainly solves the technical problem that the quality of pyrolytic tar of low-rank coal is increased is solved so as to increase the content of light aromatic hydrocarbon with important application values in tar. A down reactor, which is a riser coupling reactor, is adopted as a main body reaction unit, and the main body reaction unit is high in heat and mass transfer efficiency, simple in technological process, high in integration level and continuous and reliable in operation; high-temperature semicoke is taken as a catalyst, and methane is cracked into hydrogen, so that hydrogenation pyrolysis of coal is realized, the yield of tar and the content of light aromatic hydrocarbon inside tar are improved, and the cost of the catalyst and the hydrogen source is obviously reduced; moreover, the high-temperature semicoke is taken as a solid heat carrier, so that the heat efficiency of the process is greatly improved; moreover, an new approach for efficient clean utilization is developed for methane-rich rawmaterial gas such as traditional fossil energy coal and natural gas.

The invention provides a system and method for simultaneous dry-method hydrogen production from catalytic methane decomposition and carbon dioxide separation. The system comprises a methane decomposition system (I), a catalyst regeneration system (II), a gas solid separation system (III), and a gas circulating system (IV), wherein the methane decomposition system (I) is used for preparing and purifying hydrogen; the catalyst regeneration system (II) is used for receiving the deactivated catalyst, and the methane mixed gas, which is not completely converted, from the methane decomposition system (I), and causing the deactivated catalyst and the methane mixed gas to react with an oxide to eliminate carbon decomposition and provide the heat needed by the methane decomposition system (I); the gas solid separation system (III) is used for receiving and separating the solid particle and conveyed gas from the catalyst regeneration system (II) and the methanol decomposition system (I), and conveying the separated solid particle and conveyed gas into corresponding reactors; the gas circulating system (IV) is used for receiving the carbon dioxide gas from the gas solid separation system (III), collecting partial carbon dioxide gas, and returning partial carbon dioxide and decomposed gas into a reduction reactor (7). By adopting the system disclosed by the invention, the full-component graded conversion of the methanol is achieved.

The invention discloses a method for coproduction of carbon black and high-purity hydrogen by high-temperature pyrolysis of methane, which comprises the following steps: taking fuel gas with low caloric value of 1300-1500kcal / Nm3 as a fuel, taking methane-containing gas as a raw material, adopting the alternate working mode of controlling the quantity of supplied oxygen used for combustion-supporting for further promoting the full combustion of the fuel gas with the low caloric value, storing heat in a reaction furnace, removing the residual gas and carrying out methane pyrolysis, and building a methane non-oxygen high-temperature pyrolysis reaction environment, and the method specifically comprises the process steps of regulating the combustion-supporting gas, storing the heat in the reaction furnace, removing the residual gas, carrying out the methane pyrolysis, collecting the carbon black, and purifying for producing the hydrogen. The process is simple, and the amplification of production capacity and the continuous high-efficient production can be realized through the multi-stage combination of the pyrolysis reaction furnaces. The method can not only fully utilize the low-caloric value fuel gas resources and realize high reaction efficiency, but also reduce the emission of greenhouse gas and realize the low-carbon clean circulatory production, and a set of production process can realize the coproduction of the high-quality carbon black and the high-purity hydrogen.

The invention belongs to the technical field of methane conversion, in particular to a methane oxidative coupling method based on the chemical chain lattice oxygen transfer technology, which uses a composite material with methane catalytic cracking and selective oxygen supply functions to realize one-step efficient methane oxidative coupling The catalytic oxygen supply material is composed of a methane cracking catalyst and a selective oxygen supply material. The catalytic part provides active sites for the activated cracking of methane, and the oxygen supply material part transmits oxygen atoms through lattice oxygen to supply oxygen for the reaction. Oxidation and regeneration of free oxygen; Catalytic oxygen carrier oxidation-reduction cycle realizes the transfer of oxygen in this reaction, avoiding the direct contact between free oxygen and methane; Directional control of lattice oxygen activity weakens the excessive oxidation of methane and improves the oxidation of olefins. Selectivity and yield of olefins; at 800°C to 850°C, methane oxidative coupling has higher reactivity and selectivity.

The invention discloses a bubbling type methane decomposition reaction device for high-temperature particle heating. The device is mainly applied to an ultra-high temperature condensation solar system. A plurality of special bubbling type direct methane decomposition reactor units are arranged in a main body part (a heat-carrying particle heat release tank) of the device; high-temperature heat-carrying particles downwards flow through the reactor units from the top of the heat release tank and transfer heat to heat-carrying fluid in the reactor units; methane bubbles are decomposed to producehydrogen and carbon nano-particles in the heat-carrying fluid; the carbon nano-particles and reactive gases are separated in the reactor units and extracted by an induced draft fan; and after discharged from the reactor units, the reacted mixed gases (the hydrogen and unreacted methane gas) are cooled to be fed into the next-stage reactor units to be continuously reacted or fed out of the device to enter a hydrogen separation system. According to the device disclosed by the invention, the heat-carrying fluid does not need to be fed out of the device to be heated, and safe and stable operationsof the system are ensured; and due to the modular design of the reactor units, the zoom design of the device is conveniently realized.