52 results about "Methane decomposition" patented technology

The invention discloses a preparation method of a Sn-Bi-Ni-Cu quaternary liquid alloy methane cracking catalyst, production raw materials comprise composite melt metal and composite transition metal, and the mass ratio of the composite melt metal to the composite transition metal is 1: (0.3-1.2); the composite melt metal is composed of Sn and Bi according to the mass ratio of 1: (1.3-1.7); the composite transition metal is composed of Ni and Cu according to the mass ratio of 1: 0.15-1.2. The quaternary liquid alloy catalyst has the advantages that: 1) compared with the existing catalyst for hydrogen production by methane cracking, the quaternary liquid alloy catalyst provided by the invention can stably operate for more than 1000 hours in a range of normal pressure to 3MPa and air speed of 100-100mL. G <-1 >. H <-1 >, the active phase retention rate is more than 95%, and the quaternary liquid alloy catalyst is especially suitable for alkane pyrolysis hydrogen production, CO2 hydrogenation and easy carbon deposition reaction systems, and has a wide application prospect; a new material design thought and an engineering implementation scheme are provided for the field of liquid metal high-temperature catalysis; and 2) experiments show that the quaternary liquid alloy catalyst prepared by the method provided by the invention can significantly improve the carbon sequestration rate and the hydrogen yield.

According to the nickel-based catalyst and the preparation method and application thereof, through Ga modification, the methane cracking depth can be reduced, and then carbon deposition is effectively inhibited; ceO2 oxygen vacancies can effectively activate CO2, the generated intermediate oxygen species O further reacts with deposited carbon so as to achieve the purpose of carbon cleaning, the GaxNi / CeO2 catalyst is prepared by adopting a urea homogeneous precipitation method, 1000-hour long-term stable catalytic conversion of the nickel-based catalyst in a carbon dioxide methane dry reforming reaction is achieved, and the catalyst has the advantages of simple process, low cost and high efficiency. The nickel-based catalyst prepared by the method can keep good catalytic stability.

The invention relates to the technical field of hydrogen production through methane cracking, in particular to a sea urchin-shaped composite catalyst, a preparation method thereof and application of the sea urchin-shaped composite catalyst in hydrogen production through methane cracking. The obtained sea-urchin-shaped composite catalyst has a sea-urchin-shaped appearance, can efficiently catalyze methane cracking to produce hydrogen, simultaneously captures CO2 produced by vapour gasification carbon deposition in a catalyst regeneration process to generate CaCO3, promotes the gasification hydrogen production of the carbon deposition and strengthens the removal effect of the carbon deposition, and the generated CaCO3 can also be converted into CO in situ, so that the catalyst has a good application prospect. The obtained catalyst has good anti-sintering performance and excellent recycling performance.

Disclosed is a method of producing hydrogen and carbon nanotubes by methane decomposition and its use as an electrode material, and more particularly, a method of manufacturing an electrode material for an electrode, including promoting methane decomposition to produce high-purity hydrogen and carbon nanotubes by using a nickel-based catalyst, and manufacturing an electrode material using the carbon nanotubes.

The invention discloses a method for constructing a high-conductivity / heat-conductivity carbon material based on microwave induction, and belongs to the technical field of nano carbon material synthesis. According to the method, methane and auxiliary gas are introduced into a variable-frequency microwave vapor deposition system, and the microwave frequency is dynamically regulated and controlled within the range of 2.43-7.5 GHz, so that the methane cracking rate, plasma energy distribution and deposition kinetics are regulated; controllable deposition of multi-scale and multi-morphology composite carbon structures (carbon nanotubes, graphene-like and amorphous carbon) on the surface of a single substrate under the constant temperature condition is achieved, and therefore the microstructure and the electromagnetic response performance are optimized. According to the method, the frequency conversion microwave technology is introduced into a methane cracking deposition system for the first time, atomic-scale controllable deposition of the carbon material is achieved, complex temperature gradient control is avoided, and the obtained carbon-based material has high electric conductivity / heat conductivity, wide-frequency-band shielding effectiveness and excellent structural stability.

This application discloses a process for improving the yield of HCN prepared by the Andruse process, belonging to the field of HCN preparation technology. This application utilizes the tail gas after HCN removal and dehydration reactions, using residual methane in the tail gas to increase methane conversion, using CO in the tail gas to inhibit methane decomposition and improve methane selectivity, and using H2 in the tail gas, with H2 combustion providing heat instead of the heat provided by methane decomposition. This improves the conversion rate of methane to HCN, increases the overall reaction yield, and eliminates ammonia residue in the post-reaction gas, saving the ammonia removal step. Simultaneously, it reduces air consumption and increases the ratio of ammonia to methane to oxygen, allowing the reaction to proceed far from the explosion zone, thus improving process safety.

The invention relates to a gamma-Al2O3 loaded nickel-based catalyst for methane cracking and a preparation method of the gamma-Al2O3 loaded nickel-based catalyst. The preparation method comprises the following steps: dissolving nickel acetylacetonate and cobalt acetylacetonate in an inert organic solvent, stirring to uniformly mix the nickel acetylacetonate and the cobalt acetylacetonate, heating to 90-110 DEG C, keeping for 15-30 minutes to form a mixed solution, rapidly cooling to crystallize, carrying out solid-liquid separation, washing and drying to obtain a solid-phase precursor; grinding and mixing the solid-phase precursor and a gamma-alumina carrier, heating to 650-750 DEG C in an air atmosphere, keeping for 3-5 hours, and then naturally cooling to room temperature to obtain a calcined product; and heating the calcined product to 650-750 DEG C in a mixed atmosphere of hydrogen and inert gas, roasting and reducing for 3-5 hours, and then naturally cooling to room temperature to obtain the gamma-aluminum oxide loaded nickel-based catalyst. The prepared catalyst is high in carbon deposition resistance and sintering resistance, and has excellent reaction activity and stability in a methane cracking reaction.

The utility model relates to the field of methane high-temperature catalysis systems, in particular to a methane high-temperature catalysis system based on a liquid metal catalyst. The methane high-temperature catalytic system comprises a heat regenerator, a heater, a methane high-temperature catalytic cracking furnace, a hydrogen purification device, a desorbed gas compressor, a three-phase separator, a cooler and a deflation compressor, and the cooler and the three-phase separator are respectively connected to the deflation compressor through pipelines; the deflation compressor, the desorbed gas compressor and the heat regenerator are respectively connected to the hydrogen purification device through pipelines, and the desorbed gas compressor, the methane high-temperature catalytic cracking furnace and the heater are respectively connected to the heat regenerator through pipelines. Through combined communication of the heat regenerator, the heater, the methane high-temperature catalytic cracking furnace, the hydrogen purification device, the desorbed gas compressor, the three-phase separator, the cooler and the air release compressor, automatic continuous production is realized, and through system heat balance optimization, energy consumption is greatly reduced, and methane cracking efficiency is greatly improved.

The utility model discloses a methane cracking hydrogen production and carbon product continuous separation and purification device which mainly comprises a methane cracking reaction part for providing a reaction space for methane cracking reaction, a carbon product separation and collection part for realizing separation of a carbon product and metal catalyst impurities and facilitating collection of the carbon product, and a carbon product separation and collection part for realizing separation of the carbon product and metal catalyst impurities. The catalyst feeding part is used for timely supplementing a catalyst consumed in the reaction process, and the gas circulating part is used for recycling uncracked methane, improving the yield of hydrogen production through methane cracking and reducing methane gas waste. According to the utility model, methane is cyclically cracked in the molten metal catalyst, so that the methane cracking efficiency is improved; by collecting and purifying a carbon product, the operation cost is reduced, the hydrogen purity is improved, clean energy is generated, and carbon-free emission of energy is realized.

The present disclosure relates to a carbon dioxide methanation and methane cracking coupled carbon sequestration power generation system and method. The system comprises a methane cracking unit, a methanation reaction unit and an energy recovery unit. The method uses a molten medium catalyst to catalyze methane cracking to produce hydrogen and solid carbon material; the hydrogen produced by methane cracking is used for Sabatier reaction to generate methane and water; the methane generated by Sabatier reaction is used for hydrogen production and solid carbon material; the heat released by Sabatier reaction and / or the heat discharged after the endothermic methane cracking reaction is used for power generation by a heat power conversion power generation system. The present disclosure solves the problem of catalyst carbon deposition and deactivation through process innovation and system integration, reduces the dependence on purchased hydrogen, and realizes the step-by-step utilization of energy in the reaction process.

The invention discloses a silane purification process which comprises the following steps: under the conditions of 250-350 DEG C and illumination, methane of silane containing methane impurities is cracked into solid carbon and hydrogen under the action of a photo-thermal catalyst reduced by hydrogen; the photo-thermal catalyst is a core-shell bifunctional catalyst and / or a core-shell-photosensitive three-functional catalyst; the core-shell bifunctional catalyst comprises a nickel core and a mesoporous silica shell wrapping the nickel core; the core-shell-photosensitive three-function catalyst comprises a nickel core, a mesoporous silica shell wrapping the nickel core and a CeO2 photosensitive layer distributed on the outer surface of the mesoporous silica shell in a nano island structure; in the photo-thermal catalyst, the pore diameter of the mesoporous silica shell is 2.3-2.7 nm.

The invention relates to the field of alkane cracking, and discloses an alkane cracking method, which comprises: (1) carrying out steam cracking on a cracking raw material containing alkane; (2) separating methane-rich gas from the steam cracking product; (3) performing methane cracking on the methane-rich gas; wherein the methane cracking is carried out in the presence of a plasma or a plasma and a catalyst. According to the method for cracking the alkane, the alkane cracking raw material can be cracked, methane in the cracking product can be further cracked, the methane in the cracking product is fully utilized, and meanwhile carbon emission is reduced.

The utility model relates to the technical field of hydrogen production, storage and transportation, in particular to a low-temperature adsorption type hydrogen production and storage and transportation system. The system comprises a liquefied natural gas storage tank, a cold energy recoverer, a heater, a methane cracking furnace, a separator, a desorbed gas compressor, a hydrogen compressor, a low-temperature adsorption tank and a low-temperature adsorption type gas cylinder, and the liquefied natural gas storage tank, the cold energy recoverer, the heater and the methane cracking furnace are sequentially communicated through pipelines. The outlet end of the methane cracking furnace is connected to the inlet of the heater through a pipeline, the outlet of the heater is connected with the separator through a pipeline, and the outlet of the separator is respectively connected to the cold energy recoverer and the pipeline between the cold energy recoverer and the heater through two pipelines. Through cooperation of the cold energy recoverer, the heater, the methane cracking furnace, the separator, the desorbed gas compressor, the hydrogen compressor, the low-temperature adsorption tank and the low-temperature adsorption type gas cylinder, efficient production and high-density storage and transportation of hydrogen are realized by taking natural gas as a raw material.

The invention relates to a carbon dioxide methanation and methane cracking coupled carbon sequestration power generation system and method. The system comprises a methane cracking unit, a methanation reaction unit and an energy recovery unit. According to the method, a molten medium catalyst is adopted to catalyze methane cracking to generate hydrogen and a solid carbon material; hydrogen generated by methane cracking is used for a Sabatier reaction to generate methane and water; methane generated by the Sabatier reaction is also used for cracking to produce hydrogen and solid carbon materials; the heat released by the Sabatier reaction and / or the heat flowing out after heat absorption of the methane cracking reaction are / is used for power generation of the heat-to-power conversion power generation system. Through process innovation and system integration, the problem of catalyst carbon deposition inactivation is solved, outsourced hydrogen dependence is reduced, and gradient utilization of energy in the reaction process is achieved.

Method for the production of hydrogen and renewable carbon from catalytic pyrolysis of methane for the steel industry including the steps of: - receive a gas stream including methane - receive an amount of amorphous carbon catalyst - at a controlled temperature in a reactor, perform a methane cracking reaction using the amorphous carbon catalyst generating a mixture of hydrogen and an additional gas, preferably methane; and an amorphous coke carbon comprising the catalyst carbon and carbon deposited during cracking.

The invention belongs to the technical field of methane cracking hydrogen production, and particularly relates to a catalyst for methane cracking hydrogen production as well as a preparation method and application thereof. The preparation method of the catalyst for hydrogen production by methane cracking comprises the following steps: preparing the KCC-1 carrier; preparing a metal precursor solution: dissolving metal salt in deionized water to form a metal salt solution with specific concentration; the preparation method comprises the following steps: adding a KCC-1 carrier into a metal salt solution, and stirring at room temperature to form uniform slurry so as to ensure that metal salt is in full contact with the KCC-1 carrier; and heating and continuously stirring until the solvent is completely evaporated, drying the obtained solid, and calcining to obtain a metal / KCC-1 composite material, namely the catalyst. The high specific surface area of the KCC-1 carrier and a radial fiber mesoporous network are utilized, so that metal species are highly dispersed on the surface of the carrier and in pore channels, the number of effective active sites is remarkably increased, and the methane cracking activity and stability are improved; by adjusting the composition and proportion of the metal precursor solution, controllable adjustment of the morphology of the cracked carbon material can be achieved, preparation of high-purity hydrogen and collaborative output of high-added-value carbon nanomaterials are both considered, and the method is suitable for a fixed bed or fluidized bed methane cracking hydrogen production device.

This invention discloses a near-zero CO2 emission hydrogen and solid carbon co-production device, relating to the fields of catalytic gas cracking hydrogen production via molten liquid media and carbon materials technology. It addresses the problems of high carbon emissions, high energy consumption, easy catalyst deactivation, and difficulty in separating carbon products in existing hydrogen production technologies. The device includes a methane cracking reactor with an internal methane cracking reaction zone and a carbon product storage transition zone between the reactor and the reaction zone. An air reactor is connected to a circulation mechanism. A novel energy supply method provides the necessary energy for methane cracking, achieving zero CO2 emissions during the energy supply process. This invention utilizes the excellent thermal conductivity, fluidity, and catalytic capacity of the molten liquid medium to effectively solve problems such as catalyst deactivation. By setting up the methane cracking reaction zone and the carbon product storage transition zone, automatic and continuous separation of solid carbon particles is achieved, ensuring the continuous, stable, and safe operation of the entire device.

The invention relates to the field of methane cracking, in particular to a process and system for co-producing hydrogen and a carbon material through methane cracking, and the process for co-producing hydrogen and the carbon material through methane cracking comprises the following steps: S1, a first feed gas is subjected to a methane cracking reaction in a first reactor to obtain a first mixed gas and a first carbon material; s2, filtering the second feed gas, the first mixed gas generated in the step S1 and the first carbon material, intercepting the first carbon material, and flowing out the second feed gas and the first mixed gas, namely second mixed gas; s3, the second mixed gas obtained in the step S2 is subjected to a methane cracking reaction through a second reactor, and hydrogen-rich mixed gas, tar steam and a second carbon material are generated; s4, separating out tar from the hydrogen-rich mixed gas and the tar steam obtained in the step S4 through oil-gas separation, and collecting the hydrogen-rich mixed gas; s5, purifying the hydrogen-rich mixed gas obtained in the step S4 to obtain hydrogen and purge gas; s6, washing and drying the first carbon material intercepted in the step S2 to obtain a dried first carbon material; and S7, combusting the tar obtained in the step S4 by using the purge gas obtained in the step S5, and providing heat for the drying treatment in the step S6 by using high-temperature flue gas generated by combustion.

The invention discloses a nitrogen-doped carbon modified Ni / MgAlO catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: firstly, taking a magnesium source, an aluminum source, a nickel source and hexamethylenetetramine as raw materials, preparing NiO / MgAlO through hydrothermal reaction and roasting, then carrying out surface modification on the NiO / MgAlO by taking dopamine hydrochloride as a carbon source, and carrying out carbonization treatment in a nitrogen atmosphere to prepare the Ni / MgAlO catalyst. A strong electron interaction exists between a carbon modifier introduced by carbonization and nickel, and the migration rate of carbon generated by methane cracking on the surfaces of nickel particles is accelerated through a homogeneous repulsion action mechanism, so that the formation of coated carbon is reduced, and the catalytic activity of the catalyst and the selectivity to hydrogen are enhanced; the carbon modifier on the surface of the catalyst has a space shielding protection effect on nickel particles, carbon generated by methane cracking is prevented from directly covering the surfaces of the nickel particles, meanwhile, sintering agglomeration of the nickel particles at high temperature is inhibited, and the catalytic stability of nickel is enhanced.

The utility model relates to hydrogen energy carbon reduction technology field, and disclose a kind of coal-fired power plant oxygen-enriched combustion low carbonization system based on hydrogen energy, the system includes: combustion power generating unit and electrolytic water unit, the electrolytic water unit is used to deliver oxygen to coal-fired power plant;The system further includes: carbon dioxide capture unit, heat exchange unit, methanation unit, methane cracking unit and renewable energy power generating unit, the carbon dioxide capture unit is used to capture carbon dioxide in combustion power generating unit tail gas, the methanation unit is used to carry out methanation reaction to generate methane and water with carbon dioxide and hydrogen, the methane cracking unit is used to generate green graphite or carbon black such as carbon element and hydrogen with methane cracking reaction, and the renewable energy power generating unit is used to deliver renewable energy power generating unit's electric power to system.The utility model solves the problem of carbon dioxide capture and processing of combustion tail gas, realizes carbon element resource utilization, oxygen element recycling effect.

The present application relates to a kind of acetylene yield improvement pyrolysis method and system.The present application can set different reaction temperatures according to the needs in different reaction zones by designing segmented reaction zone;With methane or methane-rich mixed gas as carrier gas, it not only shortens the reaction time, but also can promote the cracking of methane, and the reaction product hydrogen of methane cracking is the activation component of high-temperature cracking of cracking raw material, which can promote the chain scission of cracking raw material to generate acetylene and improve the acetylene yield.

The application discloses a mesoporous hollow sphere assembly structure catalyst and a preparation method and application thereof, and belongs to the technical field of hydrogen production by methane decomposition. The preparation method comprises the following steps: dissolving Ni salt, Al salt and Ce salt in a solvent, and controlling the molar ratio of Ni, Al and Ce to be 7:(1-2.5):(0.5-2); obtaining atomized liquid drops through atomization, and performing a decomposition reaction on the atomized liquid drops at 400-500 DEG C; collecting reaction products, drying, and then calcining by heating to 550-700 DEG C to obtain a catalyst precursor; and performing reduction treatment on the catalyst precursor in a reducing atmosphere, and the mesoporous hollow sphere assembly catalyst with a cerium-doped regulated interface is obtained. The catalyst exhibits remarkable high mass space velocity long-term stability and anti-coking performance in the methane catalytic decomposition reaction.

A method for preparing a Ni—Cu alloy catalyst is provided in which the catalyst exhibits improved stability as a catalyst for methane cracking to produce hydrogen and solid carbon. In one embodiment, a method of cracking methane is also provided using the Ni—Cu alloy catalyst.

The application discloses a kind of nitrogen-doped carbon modified Ni / MgAlO catalyst and its preparation method and application, belong to catalytic technology field.The present application is with magnesium source, aluminium source, nickel source and hexamethylene tetramine as raw material, by hydrothermal reaction and calcination preparation NiO / MgAlO, then with hydrochloric acid dopamine as carbon source to its surface modification, again carbonization treatment under nitrogen atmosphere, preparation Ni / MgAlO catalyst.Carbonization introduced carbon modifier and nickel exist strong electronic interaction, and through the same kind of repulsion effect mechanism accelerates the migration rate of carbon produced by methane cracking on the surface of nickel particle, reduce the formation of coated carbon, enhance the catalytic activity and hydrogen selectivity of catalyst;Carbon modifier on the surface of catalyst prevents methane cracking generated carbon from directly covering the surface of nickel particle, while inhibiting nickel particle sintering agglomeration at high temperature, enhances the catalytic stability of nickel.

The utility model relates to the technical field of hydrogen production devices, in particular to a methane cracking device and a hydrogen production system, which comprise a plasma generator, a gas inlet end of the plasma generator is communicated with a methane gas source; the spraying end of the plasma generator is arranged in the first cracking chamber; according to the utility model, the first cracking chamber and the second cracking chamber which are communicated with each other are arranged, so that the coverage area of a high-temperature environment is larger, the staying time of methane in the high-temperature environment is prolonged, and the cracking efficiency of the methane is improved.

This invention discloses a gas-solid particle reactor and its operating method for particle stacking, relating to the field of carbon sequestration and emission reduction equipment technology. It includes an inlet / outlet device, a cylindrical reactor, an outlet device, and a production platform control mechanism. The production platform control mechanism is located below the cylindrical reactor, and the heating device is located on the outer side of the middle section of the cylindrical reactor. The inlet / outlet device is connected to the end of the cylindrical reactor via a sealed bearing A, and the outlet device is connected to the tail of the cylindrical reactor via a sealed bearing B, thus ensuring that the positions of the inlet / outlet device and the outlet device are not affected regardless of the rotation of the cylindrical reactor. This device, through particle stacking reaction, pioneers a new method for methane cracking to produce hydrogen, realizing the continuous production of nano-additives, and is of great significance for the clean utilization of methane gas and carbon sequestration and emission reduction.

The present invention relates to a method for producing hydrogen and carbon nanotubes through methane decomposition, and a use thereof as electrode materials. More specifically, the present invention provides a method for producing electrode materials for batteries, wherein methane decomposition is promoted using a nickel-based catalyst to simultaneously produce a high yield of carbon nanotubes and high-purity hydrogen, and the produced carbon nanotubes are used to produce the electrode materials for batteries.

The invention provides a methane cracking hydrogen production fluidized bed membrane reactor and a methane cracking hydrogen production method.The methane cracking hydrogen production fluidized bed membrane reactor comprises a reactor shell, a hollow fiber membrane bundle, a carbon carrying medium and a carbon collecting mechanism, the lower shell is filled with the carbon carrying medium, and the reactor shell comprises an upper shell and a lower shell which are separated from each other; a reaction tail gas outlet and a methane feeding hole are formed in the side wall of the lower shell, and a material discharging hole is formed in the bottom of the lower shell; the hollow fiber membrane bundle is arranged in the reactor shell and comprises a reaction layer and a separation layer which are sequentially stacked from outside to inside, the outer side of the reaction layer and an inner cavity of the lower shell jointly form a reaction cavity, and the separation layer and an inner cavity of the upper shell jointly form a separation cavity; the carbon collecting mechanism comprises a carbon collecting bin, and the carbon collecting bin communicates with the material discharging opening. Compared with the prior art, the technical problem that hydrogen separation and purification and carbon product separation cannot be carried out simultaneously in the existing methane cracking hydrogen production process is solved.

The present application belongs to the technical field of energy system, and relates to a solar-driven cold, heat, electricity and hydrogen combined supply system and method, aiming to solve the problems of high dependence on fossil energy, low energy efficiency and large carbon emission. The present application comprises: a photovoltaic power generation device; a methane staged reforming system for cracking methane to generate solid carbon and hydrogen, and for disulfurizing the solid carbon and carbon dioxide to generate carbon monoxide; an electrolytic device electrically connected with the photovoltaic power generation device for electrolyzing water to generate oxygen; an internal combustion engine with a carbon monoxide outlet connected with a fuel inlet and an oxygen inlet connected with an oxygen outlet of the electrolytic device; an absorption heat pump connected with a flue gas outlet of the internal combustion engine; an air source heat pump electrically connected with the internal combustion engine and / or the photovoltaic power generation device; and the flue gas outlet of the internal combustion engine is further connected with a carbon dioxide inlet of the reforming system for recycling the carbon dioxide generated by pure oxygen combustion. The present application can realize efficient conversion of solar energy, zero energy consumption gas separation, near zero carbon emission and cold, heat, electricity and hydrogen combined supply.

This invention relates to a wastewater treatment method based on carbon materials used in methane cracking for hydrogen production. The method involves cracking methane to produce hydrogen using an iron-based catalyst, collecting the carbon material byproducts, and utilizing the adsorption properties of carbon nanotubes in the byproducts and the catalytic properties of residual metals (such as iron) in the catalyst, combined with hydroxyl radicals (·OH) generated by the Fenton reaction, to achieve efficient removal of organic pollutants (such as dyes methylene blue and malachite green) from the wastewater. An external magnetic field can be applied to rapidly recover the carbon materials, enabling resource recycling.