6267results about "Hydrogen" patented technology

According to the Pt cluster catalyst, the preparation method and the application, an aluminum oxide composite metal oxide carrier is prepared by adopting a pH swing method, a defect oxide nano island is formed through high-temperature reduction treatment, and oxygen vacancies contained on the surface can firmly anchor a subsequently loaded Pt cluster, so that the coking phenomenon of the Pt-based catalyst is reduced, and the catalytic activity of the Pt-based catalyst is improved. The catalytic activity and the stability of the Pt cluster catalyst are obviously improved. Meanwhile, Pt clusters are prepared through a heating reflux method, so that the Pt clusters have high dispersity and rich active sites, the finally prepared Pt cluster catalyst is small in Pt particle size and high in atom utilization rate, and when the Pt cluster catalyst is used for catalyzing a dehydrogenation reaction of a liquid organic hydrogen carrier, the Pt cluster catalyst is weak in adsorption capacity to a product, and the catalytic activity of the liquid organic hydrogen carrier is improved. The catalyst can show high conversion rate and hydrogen release rate at low temperature, can still keep stable structure at high temperature, and provides an efficient and reliable solution for engineering application of an LOHC dehydrogenation link.

The invention provides a comprehensive energy system optimization scheduling method considering biogas reforming hydrogen production and fuel gas hydrogen doping. The method comprises the steps that S1, a comprehensive energy system structure containing biogas reforming hydrogen production and fuel gas hydrogen doping is established; s2, establishing a methane reforming hydrogen production, hydrogen-doped gas turbine and stepped carbon transaction model; s3, establishing an optimal scheduling model of the comprehensive energy system containing methane reforming hydrogen production; s4, wind and light output, load and time-sharing electricity price data of the system are obtained; and S5, solving the scheduling model in the step S3, verifying the economical efficiency and low-carbon property of the methane reforming hydrogen production method, and analyzing the benefits of hydrogen-doped combustion. And multi-element production of hydrogen energy is realized. A green route for converting biomass energy into hydrogen energy is provided, and through comparative analysis of a hydrogen production energy source and a hydrogen production scheme, external gas purchase is reduced, and the carbon emission of converting biomass into heat energy is reduced. And multi-element utilization of hydrogen energy is realized. And absorption of wind and light new energy is promoted. And a stepped carbon transaction mechanism is introduced.

The invention discloses a method for preparing a rare earth high-entropy alloy catalyst and application of the rare earth high-entropy alloy catalyst. The method comprises the following steps: (1) carrying out ball milling to obtain alloy powder; (2) the alloy powder is pressed into a cylinder for sintering; (3) crushing the sintered metal cylinder into rare earth high-entropy alloy powder; (4) carrying out wet mechanical ball milling on the rare earth high-entropy alloy powder; and (5) the ball-milled rare earth high-entropy alloy powder is centrifuged and then dried. The invention further discloses application of the obtained six-element rare earth high-entropy alloy catalyst, the six-element rare earth high-entropy alloy catalyst has excellent catalytic performance, and the hydrogen absorption and desorption dynamic performance of MgH2 is remarkably improved.

The invention relates to a preparation method of a flexible solid hydrogen storage bed body, which comprises the following steps: S1, mixing 74-90% by mass of hydrogen storage alloy powder and 3-16% by mass of carbon-based heat conduction material for 20-50 minutes in a mechanical stirring manner to obtain a dry powder mixture; s2, adding an organic silicon material with the mass fraction of 5-16%, and continuously mechanically stirring for 1-5 hours to obtain a non-dry powder mixture; and S3, carrying out vacuum drying on the non-dry powder mixture in the S2 at 60-100 DEG C for 8-20 hours, and naturally cooling to room temperature to obtain the required novel non-dry powdery hydrogen storage bed body. Through the synergistic effect of the hydrogen storage alloy, the expanded graphite and the double-liquid silica gel, the flexible solid hydrogen storage material is formed on the basis of optimizing the material ratio and the process sequence. The synergistic effect of the materials breaks through the defect that a traditional hydrogen storage bed body is too high in rigidity or in a loose powder state, and finally the hydrogen storage bed body has high hydrogen storage efficiency, stable cycle life and excellent safety performance.

The invention discloses a titanium dioxide nanotube confinement catalyst for methane dry reforming and a preparation method and application thereof, a transition metal element is used as an active phase, the titanium dioxide nanotube confinement transition metal element catalyst is modified by a rare earth metal element, and the weight of the methane dry reforming catalyst is used as a reference. The content of the transition element is 1-10%, preferably 1-5%, and the content of the rare earth element is 1-5%, so that the problems of activity reduction and poor stability caused by easy generation of carbon deposition of the methane dry reforming catalyst in the prior art are solved.

The invention is suitable for the technical field of solid hydrogen storage, and provides a preparation method and application of a PCN-doped MOF derived nano-porous hydrogen storage composite material. The preparation method comprises the following steps: firstly, synthesizing a cobalt-nickel bimetallic MOF material, and introducing melamine polyphosphate and pentaerythritol ester in the synthesis process; introducing metal vanadium ions to obtain an MOF derivative, and calcining the MOF derivative to obtain the PCN-doped MOF derivative nano-porous hydrogen storage material. And compounding with magnesium hydride to obtain the V-Ni-Co / PCN + MgH2 hydrogen storage composite material. The hydrogen storage capacity of the prepared material reaches 7.0 wt% or above, rapid hydrogen absorption can be started at 40 DEG C, the dehydrogenation starting temperature is reduced to about 150 DEG C, rapid hydrogen absorption / hydrogen desorption is completed within 30 min and 45 min respectively, and excellent hydrogen storage thermal / dynamic performance is shown; after 100 times of hydrogen absorption and desorption cycles, the hydrogen storage capacity retention rate of the material is as high as 97%, and the material shows excellent cycle stability.

The invention relates to the technical field of hydrogen storage and release, and discloses a cyclic hydrogen storage and release system based on aromatic cycloalkane reaction, which comprises a hydrogenation reaction unit, a dehydrogenation reaction unit, a gas-liquid separation and compression unit and an adsorption and purification unit which are sequentially connected through pipelines, the hydrogenation reaction unit, the dehydrogenation reaction unit and the gas-liquid separation and compression unit are respectively connected with the heat exchange unit; the hydrogen storage function and the hydrogen desorption function are integrally designed, the microwave heat supply dehydrogenation reactor is designed for the dehydrogenation reaction link with high energy consumption, and compared with the prior art, the microwave heat supply dehydrogenation reactor has the advantages that the heat transfer resistance is reduced, the reaction efficiency is improved, and the energy loss is reduced. The designed gas-liquid separation and adsorption purification technology is coupled, only one compressor is used in the whole process, the purification process is effectively simplified, the operation is simple and convenient, the equipment cost and the hydrogen purification cost are reduced, and the hydrogen yield and the hydrogen storage carrier cyclic utilization rate are improved. The system has the advantages of high hydrogen storage and release efficiency, small system size, high mobility and the like.

A thermochemical system and method for thermochemical decomposition of a hydrocarbon feedstock such as methane or natural gas within an insulated volume where the important elements of the thermochemical system are located within the insulated volume. The insulated volume contains a heater and a thermal energy storage medium in thermal communication with the heater such that it is heated by the heater and stores the thermal energy it receives by a heat storage process. The thermal energy storage medium is also configured to release the thermal energy that it stored in the form of a released heat. The insulated volume also contains a hydrocarbon pyrolysis reactor thermally coupled with the thermal energy storage medium to receive the released heat and use it for driving pyrolysis of the hydrocarbon feedstock to produce pyrolysis products containing primarily hydrogen and a solid carbon product. Pyrolysis of the hydrocarbon feedstock is driven at a high temperature, such as between 700 ° C and 2, 000 ° C.

The present invention relates to a process and a system for the production of hydrogen and carbon by catalytic non-oxidative decomposition of hydrocarbons, such as saturated C1+ hydrocarbons, such as methane, in the presence of a fresh or a spent catalyst composition comprising at least one carbon catalyst. The process of the invention is characterised in that the fresh or spent catalyst composition is heated by means of induction heating to a temperature comprised between 500° C. and 1100° C. The catalyst compositions as applied in accordance with the invention comprise, and preferably consist of, (I) a first component, wherein said first component is selected from one or more non-porous carbon catalysts and / or one or more porous carbon catalysts; and (II) optionally, a second component, wherein said second component consists of a non-carbon material, and preferably is a ceramic or zeolitic support material. Further provided are a spent catalyst obtained when carrying out a process of the invention, and uses thereof.

The invention provides a bimetallic-catalyzed magnesium-based hydrogen storage material and a preparation method thereof, and relates to the technical field of hydrogen energy. The magnesium-based hydrogen storage material is a compound mainly formed by magnesium hydride and a catalyst, and the catalyst is a bimetallic catalyst TiO2 / C / Ni formed by loading nickel and titanium dioxide on a carbon substrate; according to the magnesium-based hydrogen storage material MgH2-TiO2 / C / Ni, a bimetallic catalyst TiO2 / C / Ni is introduced into MgH2, trace efficient catalysis of MgH2 is achieved, the hydrogen storage capacity of MgH2 is not excessively lost, meanwhile, the excellent catalytic effect can be achieved, and therefore the prepared magnesium-based hydrogen storage material MgH2-TiO2 / C / Ni shows excellent hydrogen storage performance and hydrogen absorption and desorption cycle stability. The invention also provides a preparation method of the bimetal catalyzed magnesium-based hydrogen storage material, and the preparation method introduces a catalyst into an MgH2 system through a ball milling method to realize stable preparation of the magnesium-based hydrogen storage material.

The invention discloses an Mg-Ni-Nd hydrogen storage alloy with poison resistance and regeneration performance, the Mg-Ni-Nd hydrogen storage alloy comprises Nd4Mg80Ni8, Mg and Mg2Ni phases at the same time, and after hydrogen absorption and desorption activation, the Mg-Ni-Nd hydrogen storage alloy is decomposed into Mg, Mg2Ni and NdH2.61 phases in situ; the content of Mg is 85-90%, the content of Ni is 6-10%, and the content of Nd is 2-5%. The invention discloses a simulated poisoning treatment and poisoning regeneration method of an Mg-Ni-Nd hydrogen storage alloy. The poisoning atmosphere is mixed gas of CO2 and H2; the regeneration atmosphere is pure H2 atmosphere. When the alloy is used as a hydrogen storage alloy, the maximum hydrogen absorption amount reaches 5.40 wt.%. When the alloy is used as an anti-poisoning hydrogen storage alloy, the cycle index is larger than 300 times, the maximum hydrogen absorption amount is 5.10 wt%, and the CO2 concentration in the poisoning atmosphere condition and the CO2 concentration in the air are the same order of magnitude. When the alloy is used as a renewable hydrogen storage alloy, the maximum hydrogen absorption amount is 5.29 wt.%, and the hydrogen absorption amount is recovered to 97.96% of the initial hydrogen absorption amount.

The invention discloses a power control method for a methanol reforming fuel cell power generation system, and relates to the technical field of power generation system power control, and the method achieves the precise representation of the internal dynamic coupling relation of the system through the construction of a digital twin model covering the whole methanol reforming process and the whole electrochemical conversion process of a fuel cell. Therefore, the problem of hydrogen supply lag caused by reforming reaction delay in the traditional control is effectively eliminated, and the output power of the fuel cell can be highly synchronized with the load demand; the Smith predictor is adopted to perform online estimation and compensation on methanol reforming inherent time delay, and the MPC is predictively controlled to perform real-time optimization scheduling under the constraints of economical efficiency and equipment health state in combination with a multi-target model, so that the power generation efficiency is improved, the fuel consumption and the operation cost are remarkably reduced, and the inhibition capability of the system on load fluctuation is enhanced.

The invention relates to a method for synthesizing a high-value product by using refinery furnace gas, which comprises the following steps: purifying refinery crude furnace gas, feeding the purified refinery crude furnace gas into a chemical looping three-stage normal-pressure reactor, respectively obtaining near-pure carbon dioxide, nitrogen and hydrogen products in each stage of flow, and adjusting a gas framework by using the near-pure hydrogen product obtained by reforming coke oven gas as a supplementary hydrogen source, after reaching the standard of the mixed raw material, pressurizing and feeding into a synthesizer, and carrying out gas-liquid separation to obtain a methanol or ammonia product. The method solves the problem that carbon dioxide and nitrogen cannot be utilized when the traditional refinery furnace gas replaces coal-based carbon monoxide to synthesize high-value products through chemical carbonylation; part of coke oven process tail end product coke oven gas is consumed, and the defect that a cheap hydrogen source needs to be supplemented due to unmatched raw material structures in the technological process is overcome; and the tail gas and low-grade heat recycling process in each stage of production process is also optimized, and near-zero emission in the life cycle and gradient utilization of chemical energy are realized.

The invention belongs to the technical field of photocatalysis, and particularly discloses a diatomic metal complex / CdS nanorod composite photocatalyst as well as a preparation method and application thereof. The specific preparation method comprises the following steps: synthesizing a pure CdS nanorod by using an EDA assisted solvothermal reaction; then carrying out Schiff base reaction, heating in an oil bath, and condensing and refluxing to synthesize a diatomic metal complex; and putting the diatomic metal complex and the CdS nanorod into a beaker, adding ethanol, uniformly stirring and drying to obtain the diatomic metal complex and CdS nanorod photocatalytic composite material, namely the target product. The CdS nanorod is of a rod-shaped hexagonal crystal structure, the diatomic metal complex is blocky and is loaded on the wall of the CdS nanorod after being compounded with the CdS nanorod, and the main morphology of the CdS nanorod is not changed. According to the invention, the diatomic metal complex is compounded with the CdS nanorod, so that photo-induced electrons and holes can be effectively separated, and the activity of photocatalytic formic acid decomposition to prepare synthesis gas (H2 + CO) is improved.

A catalyst may include a metal oxide substrate comprising a nickel species, wherein an exposed surface of the catalyst comprises at least some of the nickel species and the exposed surface is substantially nonporous.

The invention relates to the technical field of methane cracking and hydrogen production, and discloses a metal-modified Co-Bi liquid alloy catalyst, wherein the catalyst uses Co as an active component, uses Bi low melting point metal as a solvent, and uses a third metal M as an auxiliary agent; the invention also discloses a method for preparing the catalyst, comprising: calcining a cobalt salt to generate cobalt oxide, and then forming CoO-MO X The mixture powder was finally heated under N2 and H2 atmosphere to obtain CoO‑MO X The powder is mixed with elemental Bi to obtain a cobalt-bismuth ternary liquid alloy catalyst; the present invention also discloses a method for applying the catalyst to methane cracking and hydrogen production, comprising: heating the preheating furnace to a certain temperature, introducing pure methane gas, and reacting under normal pressure, at a temperature of 500 to 700°C, with a methane space velocity of 1 to 100 mL / g·min, and after the reaction is completed, the temperature drops to room temperature in an N2 atmosphere, and the carbon product is taken out of the reaction tube after cooling. The catalyst disclosed by the present invention has the advantages of high activity, good stability, strong methane cracking ability, mild reaction conditions, simple preparation process, and long life.

The invention provides a composite metal oxide catalyst, a preparation method thereof and a methane catalytic cracking method. The catalyst comprises 10%-80% of a dehydrogenation main active component, 5%-50% of a dehydrogenation auxiliary active component and the balance of a carrier, the period of metal elements in the dehydrogenation auxiliary active component comprises at least one of a fourth period, a fifth period and a sixth period, and the group of the metal elements in the dehydrogenation auxiliary active component comprises at least one of an IB group, a VB group, a VIB group and a VIIB group; and / or the metal elements in the dehydrogenation auxiliary active component comprise La series metal; the raw material of the composite metal oxide catalyst comprises a nonionic surfactant. The invention also provides a preparation method of the catalyst and a methane catalytic cracking method using the catalyst. The composite metal oxide catalyst is high in active metal dispersity, long in service life and relatively high in methane conversion rate, and the produced carbon nanotubes are good in quality.

The invention discloses a pure silicon Beta molecular sieve packaging metal catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a silicon source, a template agent, a ligand, a metal salt and a mineralizer in water, carrying out a crystallization reaction at 120-200 DEG C, and carrying out calcination treatment and reduction treatment on the crystallized solid to obtain the pure silicon Beta molecular sieve packaging metal catalyst. The pure silicon Beta molecular sieve packaged metal catalyst is obtained. The pure silicon twelve-membered ring macroporous Beta molecular sieve encapsulated metal catalyst is prepared through a ligand protection in-situ hydrothermal synthesis strategy, so that the size of a metal nanocluster can be reduced, the high-temperature thermal stability of the metal nanocluster is improved, the adsorption and diffusion processes of guest molecules can be regulated and controlled, and the stability of the metal nanocluster is improved. Furthermore, the catalyst shows excellent catalytic performance when being used for catalyzing a propane dehydrogenation reaction and a methyl cyclohexane dehydrogenation reaction, and efficient and stable propane and methyl cyclohexane dehydrogenation performance is achieved.

The invention belongs to the field of hydrogen storage materials, and particularly relates to a preparation method of a bamboo charcoal hydrogen storage material, which comprises the following steps: carbonizing a bamboo raw material to obtain a carbonized material, mixing the carbonized material with a modifier, and activating to obtain an activated material; and washing and drying the activated material to obtain the bamboo charcoal hydrogen storage material. Wherein at least one of a bamboo raw material before carbonization, a carbonized material before activation, an activated material after activation and a washing material after washing is subjected to liquid-phase microwave pretreatment in advance before the next operation; the modifier comprises an alkaline component. The invention also comprises the material prepared by the preparation method and application of the material in a hydrogen storage material. Bamboo raw materials which are difficult to treat are successfully utilized for the first time in the industry to prepare the material with good hydrogen storage activity.

The invention discloses a preparation method and application of a mesoporous confinement nickel-based methane dry reforming catalyst, and belongs to the field of nano-catalyst preparation.According to the method, on the basis of a traditional impregnation method, a small amount of ethylene glycol is added to serve as a surface active agent, high-temperature-resistant SBA-15 with ordered mesoporous channels serves as a carrier, metal nitrate serves as a precursor, and the mesoporous confinement nickel-based methane dry reforming catalyst is prepared through a hydrothermal method; in the high-speed stirring evaporation process, along with evaporation of water, the surface tension of the mixed liquid is gradually reduced, and meanwhile, the viscosity of the solution is increased, so that the metal nitrate precursor can be conveyed into an SBA-15 pore channel and is anchored in the pore channel under the action of high viscosity. And the methane dry reforming catalyst with high activity and high stability is obtained through drying, calcining and hydrogen reduction. The catalyst has the advantages of simple preparation process, low cost, high catalytic efficiency, high stability and the like.

The invention relates to the technical field of hydrogen energy, and provides a vanadium oxide catalytic magnesium-based hydrogen storage material based on alkali metal enhancement and a preparation method. The material is prepared from spherical MgH2 powder and lamellar XV6O15 (at) C powder through a high-energy ball milling method, wherein X is one of alkali metals Li, Na and K. The material has a nanoscale composite structure, and the hydrogen storage performance can be remarkably improved. The preparation method comprises the following steps: 1) preparing XV6O15 (at) C nano powder through acid etching, alkali metal modification and heat treatment; and 2) mixing the powder with MgH2 in a protective atmosphere, and preparing the composite material by adopting high-energy ball milling. Results show that the catalyst improves the hydrogen absorption and desorption rate of MgH2, the hydrogen storage temperature is reduced to 50 DEG C for hydrogen absorption, and the hydrogen is rapidly desorbed at 200-225 DEG C. The hydrogen storage dynamics and temperature performance are remarkably optimized, an effective strategy is provided for design and application of a novel magnesium-based composite hydrogen storage material, and the method is suitable for hydrogen energy industrial application.

A pyrolysis system for conducting a hydrocarbon pyrolysis reaction and related systems and methods are disclosed herein. In some embodiments, the pyrolysis system includes a combustion component, a reaction chamber thermally coupled to the combustion component, and a recycling component fluidly coupled to an output of the reaction chamber. The reaction chamber can be couplable to a supply of pyrolysis feedstock. The thermal coupling allows the reaction chamber to transfer heat from the combustion component to the pyrolysis feedstock to generate a product stream that includes hydrogen gas and solid carbon. The recycling component receives the product stream and can direct a portion of the product stream into the combustion component. In some embodiments, the pyrolysis system includes a controller configured to adjust various operational parameters of the pyrolysis system based on various goals for combustion fuel consumption, hydrogen gas output, energy consumption, reactor efficiency, and / or the like.

The invention discloses a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and active components loaded on the carrier, the carrier is an MCM-41 molecular sieve, and the active components are nickel and samarium. Compared with other nickel-based catalysts, the catalyst disclosed by the invention has the advantages that through the synergistic effect of nickel and samarium bimetals, the interaction between the active component and the carrier is enhanced, the dispersion degree of the active metal is improved, and the anti-sintering capability of the active metal is enhanced; and the surface of the catalyst has high oxygen vacancy concentration, so that the activation of CO2 is promoted, the number of active oxygen species on the surface of the catalyst is increased, and the removal of deposited carbon is promoted. Therefore, the catalyst has good sintering resistance and carbon deposition resistance and high catalytic stability, and meets the use requirements of industrial catalysts.

The present disclosure relates to a photoreactor and method of use thereof. In an aspect, the photoreactor can be configured as a solar panel comprising a channel containing a heterogeneous photocatalyst. When water or another hydrogen-containing liquid is pumped through the photoreactor, it contacts the photocatalyst in the presence of UV or visible irradiation, simultaneously releasing hydrogen and separating the hydrogen via a gas-permeable membrane. In an aspect, the photoreactor can be used in a method for continuous production of high-purity H2 gas, the method comprising dehydrogenating tetrahydroquinoline (THQ) to form quinoline under visible light using a Rh / TiO2 heterogeneous photocatalyst. In another aspect, the catalyst includes Rh particles photodeposited on TiO2 microparticles. In a further aspect, the method can include regenerating THQ from quinoline using a water gas shift (WGS) reaction.

The invention discloses a carbon nitride-based composite material as well as a preparation method and application thereof. The carbon nitride-based composite material comprises a non-metal doped carbon nitride carrier and a noble metal, wherein the noble metal exists in the carrier in an element doping form and / or is loaded on the carrier in an oxide form; the precious metal is one or more of Pt, Pd, Au and Ru, and the nonmetal is one or more of P, S and I. According to the carbon nitride composite material disclosed by the invention, noble metal is utilized to modify carbon nitride, the number of surface active sites is increased, the electron and chemical structures of an active center are adjusted, and meanwhile, generation and migration of photo-generated charges are promoted. Meanwhile, the surface of the carbon nitride composite material is modified by non-metallic elements, so that adsorption and activation of reactant H2O molecules are effectively promoted. The catalyst disclosed by the invention is simple in preparation process, good in repeatability and easy for large-scale production.

A Liquid Organic Hydrogen Carrier (LOHC) dehydrogenation system is described, capable of meeting time-variable hydrogen demands with short dynamics while always ensuring a high degree of dehydrogenation under all operating conditions. The system comprises one or more reactors comprising an LOHC vessel and a recirculation circuit comprising a recirculation pump, a preheater capable of supplying the reaction heat as sensible heat, and a cartridge containing the solid catalyst.

The invention discloses a catalyst for hydrogen production through tar steam reforming and a preparation method and application thereof. The catalyst comprises a cobalt-magnesium-aluminum composite spinel carrier and an active component loaded on the cobalt-magnesium-aluminum composite spinel carrier, the active component comprises nickel and at least one metal additive selected from iron, zirconium and ruthenium. The preparation method mainly comprises the following steps: preparing the carrier by adopting a coprecipitation method, loading the active component by adopting an impregnation method, and drying and reducing to obtain the final catalyst. The catalyst is used for tar component steam reforming hydrogen production reaction, especially for treating raw materials containing phenol and water vapor at 600-700 DEG C, tar conversion can be efficiently catalyzed, product gas rich in hydrogen can be generated, hydrogen selectivity is high, and almost no methane is generated. The catalyst has the advantages of high activity, good stability, strong carbon deposition resistance and the like, and is suitable for purification and high-value utilization of biomass pyrolysis tar.

The invention relates to the field of solid hydrogen storage, in particular to a nanocrystalline vanadium-based hydrogen storage material as well as a preparation method and application thereof. The invention provides a method for simply preparing a nanocrystalline vanadium-based hydrogen storage material by a mechanical alloying method, and the preparation method comprises the following steps: 1, crushing vanadium: carrying out vacuum heat treatment on a vanadium block, and adding hydrogen pressure at room temperature to carry out hydrogenation crushing treatment; and 2, in an inert atmosphere, carrying out mixing and ball-milling reaction with an oxide to prepare the nanocrystalline vanadium-based hydrogen storage material. The nanocrystalline vanadium-based material is directly prepared in a ball milling mode, the preparation process and operation are simple, the production period is short, energy consumption is low, and the method is suitable for large-scale production. The nanocrystalline vanadium-based material only contains vanadium and hydrogen, the reversible hydrogen storage capacity is 1.6 wt% at the temperature of 50 DEG C, the hydrogen desorption platform pressure is 6.3 bar, and the capacity retention rate is 96% after 10 times of hydrogen absorption and desorption cycles at the temperature of 30 DEG C.

The invention discloses a method for performing tar steam reforming by coupling low-temperature plasma with a nickel-loaded hydrogen type molecular sieve composite catalyst. The method comprises the following steps: preparing the nickel-loaded hydrogen type molecular sieve composite catalyst; the mass of Ni in the nickel-loaded hydrogen type molecular sieve composite catalyst accounts for 5-30% of the mass of the catalyst; introducing tar and water vapor into a dielectric barrier discharge plasma reactor filled with the nickel-loaded hydrogen type molecular sieve composite catalyst; starting the dielectric barrier discharge plasma reactor, and carrying out a tar steam reforming reaction; wherein the temperature of the tar steam reforming reaction is 150-525 DEG C, and the power of the tar steam reforming reaction is 30-90 W. The catalyst disclosed by the invention is coupled with a low-temperature plasma technology, so that good tar reforming performance, target product selectivity and system stability are realized.

The invention relates to the technical field of catalysts, in particular to a dehydrogenation catalyst precursor, a dehydrogenation catalyst and a preparation method and application of the dehydrogenation catalyst precursor. According to the dehydrogenation catalyst precursor, a sulfur-modified magnesium-aluminum mixed oxide is used as a carrier, and a Pt metal cluster is used as an active center; wherein the carrier is a mixed-state metal oxide with a layered hydrotalcite structure, a spinel structure and a near-crystalline synergistic structure. A magnesium-aluminum mixed oxide can be prepared by introducing a precursor of alkali metal magnesium into an aluminum oxide precursor, a layered structure or a spinel structure similar to hydrotalcite can be formed by regulating and controlling the calcination temperature, and by combining carrier surface regulation and control modification, the capability of regulating and controlling the interaction between metal and a carrier can be improved, and the performance of the catalyst is improved. Therefore, the active center of the cluster is maintained, and the acid-base property of the surface of the carrier is effectively modulated, so that carbon deposit is reduced, and the activity and stability of the catalyst are improved.