83 results about "Hydrogen adsorption" patented technology

The invention relates to the technical field of hydrogen fluoride adsorption, and particularly discloses a hydrogen fluoride adsorption tower which comprises a tower body, a gas inlet pipeline arranged on the lower section of the tower body, a gas outlet pipeline arranged on the upper section of the tower body, a plurality of layers of adsorption beds arranged in the tower body in the vertical direction, and adsorbents arranged on the adsorption beds. The material changing mechanism comprises a waste material pipe rotationally arranged in the tower body, a driving part I for driving the waste material pipe to rotate, a plurality of inverted conical funnels respectively arranged below the plurality of layers of adsorption beds and a plurality of trapping boxes arranged on the waste material pipe, and the waste material pipe penetrates through all the adsorption beds; a plurality of spiral scrapers for driving the adsorbent to radially flow are arranged on the waste pipe, the upper end of the inverted-cone-shaped funnel exceeds the outer edge of the adsorption bed, an annular air jet hole is formed in an outlet in the bottom of the inverted-cone-shaped funnel, and the trapping boxes surround the waste pipe in an annular array; the device has the beneficial effects that saturated aluminum oxide is separated in time, so that the adsorption effect of the aluminum oxide is improved.

The invention relates to an electrode and a preparation method and application thereof, and belongs to the field of water electrolysis industry. The preparation method of the electrode comprises the following steps: providing an electroplating base material; nickel is plated on the surface of the electroplating base material to form a nickel plating layer, and a pre-plated base material is obtained; the pre-plated base material is added into a first electroplating solution to be electroplated to form an alloy plating layer, the electrode is obtained, and the first electroplating solution comprises a NiSO4 solution with the concentration being 0.5 mol / L to 1 mol / L, a Na2MoO4 solution with the concentration being 0.01 mol / L to 0.05 mol / L and a CuSO4 solution with the concentration being 0.1 mol / L to 0.5 mol / L. Compared with nickel or common nickel alloy, the prepared electrode has the advantages that the hydrogen adsorption performance is reduced, the overpotential is effectively reduced, and the water electrolysis performance is close to that of precious metal.

A method and apparatus for regenerative hydrogen separation at high temperatures for production of pure hydrogen gas. Pure metals and metallic alloys are used at high temperatures to maximize the catalytic effect for hydrogen dissociation, hydrogen diffusion and hydrogen sorption capacity. Metallic materials are used that can selectively sorb hydrogen at high temperatures. These materials are integrated into equipment designs and process configurations to process a stream of hot mixed process gases to produce a stream of pure hydrogen product at the desired system temperature. The invention can be used to enhance the performance of existing plants such as steam methane reforming applications by increasing the conversion to hydrogen, eliminating or reducing the number of shift converters, providing pure hydrogen product, and enhancing the overall energy efficiency. In some embodiments, the hydrogen sorption system is built inside a hydrogen production reactor, enhancing the chemical equilibrium inside the reactor, to achieve higher conversion and hydrogen yields.

The utility model discloses a pressure equalizing adjusting device of a hydrogen production adsorption tower, and relates to the technical field of hydrogen production adsorption towers. The pressure equalizing adjusting device of the hydrogen production adsorption tower comprises a hollow shell with an opening in the rear end, a controller is fixedly connected to the lower end in the shell, a display screen is fixedly connected to the interior of the upper end of the front surface of the shell, and two three-way pipelines are arranged at the upper end in the shell; the left end and the right end of the three-way pipeline are fixedly connected with the outer wall of the shell, an electromagnetic valve is fixedly connected to the horizontal section of the three-way pipeline and located on the right side of the turning position, and an electromagnetic proportional valve is fixedly connected to the right end of the turning section of the three-way pipeline. And the controller is electrically connected with the display screen, the electromagnetic valve, the electromagnetic proportional valve and the pressure sensor in the adsorption tower. According to the pressure-equalizing adjusting device for the hydrogen production adsorption tower, plc control equipment and a pipeline control system are integrated together, and the internal pressure can be adjusted and controlled only through pipeline connection.

The utility model discloses a device for automatically adjusting the gas treatment amount of an adsorption tower on line, relates to the technical field of polycrystalline silicon production, and mainly aims to monitor the content of Cl <-> in hydrogen treated by the adsorption tower on line and realize automatic adjustment of an outlet adjusting valve of the hydrogen adsorption tower. According to the main technical scheme, the device for automatically adjusting the gas treatment amount of the adsorption tower on line comprises a reaction chamber, a gas inlet pipe and an ion chromatograph, the upper end of one side of the reaction chamber is connected to a discharge pipe, a filler layer is arranged in the reaction chamber, and the liquid level in the reaction chamber is located above the filler layer; one end of the gas inlet pipe is connected to the adsorption tower outlet pipe, the other end of the gas inlet pipe penetrates through the top wall of the other side of the reaction chamber and is connected to the bubbling pipe, the bubbling pipe is located below the filler layer, and a plurality of through holes are uniformly distributed in the pipe wall of the bubbling pipe; the detection end of the ion chromatograph extends into the liquid above the filler layer, and the ion chromatograph and the adsorption tower outlet regulating valve are in interlocking control.

The invention provides a hydrogen adsorption and storage composite material for a high-hygrothermal environment of a coal mine as well as a preparation method and application of the hydrogen adsorption and storage composite material, and relates to a high-efficiency hydrogen adsorption and storage composite material. The method comprises the following steps: activating activated carbon to obtain pretreated activated carbon; the method comprises the following steps: soaking zeolite in a NaCl solution, and drying to obtain pretreated zeolite; mixing ZIF-8, the pretreated activated carbon and zeolite, and adding the mixture into a ball mill for ball milling to obtain composite powder; mixing and stirring the obtained composite powder and a binder, curing into a sphere by adopting a spray drying method, and drying and heating to form a porous structure, thereby obtaining the hydrogen adsorption and storage composite material for the high-humidity-heat environment of the coal mine. According to the MOFs composite material disclosed by the invention, efficient separation and storage of hydrogen in a complex gas source are realized by utilizing a hierarchical pore structure and moisture-resistant stability of the material, relatively high hydrogen adsorption capacity and relatively high adsorption rate can be kept in a high-humidity-heat environment, and the MOFs composite material is suitable for high-risk environments such as a coal mine and the like.

This invention provides a method for preparing nano-sized magnesium hydride, comprising the steps of preparing magnesium nanoparticles by gas-phase condensation, MXene-confined catalytic hydrogenation, and atomic layer deposition to construct a composite coating layer. This invention achieves the preparation of ultrafine magnesium nanoparticles through gas-phase condensation; simultaneously utilizing the three-dimensional wrinkled structure Ti3C2T x MXene not only effectively prevents the migration and aggregation of nanoparticles during cycling through physical confinement, but also lowers the energy barrier of hydrogen adsorption and desorption reactions through in-situ generated highly active catalytic phases (such as TiH2), achieving a dual synergistic effect of confinement and catalysis. A titanium dioxide-amorphous carbon composite coating layer is constructed using atomic layer deposition (ALD) technology, which, in conjunction with the MXene confinement framework, provides a dual stabilization mechanism for nano-magnesium hydride. This invention organically combines gas-phase condensation, MXene-confined hydrogenation, and ALD coating, resulting in a product with an initial dehydrogenation temperature below 100°C and a hydrogen storage capacity retention rate exceeding 95% after 3000 hydrogen adsorption and desorption cycles, demonstrating excellent comprehensive performance.

The utility model discloses an adsorption bed with an online monitoring function, and belongs to the technical field of hydrogen adsorption and impurity removal in polycrystalline silicon production, the adsorption bed is used for hydrogen adsorption and impurity removal in polycrystalline silicon production, the adsorption bed comprises a main body, the main body comprises a shell, an adsorption mechanism is mounted on the inner wall of the shell, the adsorption mechanism comprises an adsorption bed body, and the adsorption bed body is arranged on the adsorption bed body. The surface of the adsorption bed body is fixedly connected with the inner wall of the shell, a monitoring mechanism is installed on the inner wall of the adsorption bed body and comprises a connecting plate, the surface of the connecting plate is attached to the surface of the adsorption bed body, a connecting rod is installed in the connecting plate, a connecting groove is formed in the lower surface of the adsorption bed body, and the connecting rod is connected with the connecting groove. An elastic block is fixedly connected to the inner wall of the connecting groove, the lower surface of the elastic block is attached to the upper surface of a connecting rod, and a first protruding block is fixedly connected to the surface of the connecting rod. The internal activated carbon net can be easily detached for replacement, and the practicability of the device is improved.

A method for enhancing hydrogen storage through the hierarchical thermal sequence construction of carbon-based fuel micro / nano structures belongs to the field of carbon-based hydrogen storage material preparation technology. The purpose of this invention is to address the difficulty in achieving precise control over the pore structure and oxygen-containing functional groups of carbon-based materials using existing technologies, thus hindering the realization of their hydrogen storage potential at low and room temperatures. This method utilizes potassium-containing compounds to activate and prepare a carbon substrate with a specific physicochemical structure. Then, it employs low-temperature H2O to enhance the generation of micro / nano channels. Finally, it uses low-temperature air oxidation to construct a hierarchical thermal sequence micro / nano structure with oxygen-containing functional groups. On the one hand, the synergistic effect of oxygen-containing groups and micro / nano pores significantly improves the hydrogen adsorption capacity of carbon-based fuels. On the other hand, the use of H2O and air post-treatment greatly reduces the amount of chemical activation reagents required, making the overall technology more environmentally friendly and cleaner. Simultaneously, it achieves quantitative control over the micro-meso-hierarchical pore structure and ultra-micropore sequence / oxygen content, efficiently utilizing carbon-based fuels and providing a new approach for the preparation of hydrogen storage materials.

The utility model relates to the technical field of chemical engineering, and discloses a low-pressure separated gas recovery system of a coal tar hydrogenation device for chemical engineering. The system comprises a liquid-phase hydrogenation cold low-pressure separation tank, a hydrofining cold low-pressure separation tank, a hydrofining cold high-pressure separation tank, a low-pressure separation gas desulfurization tower and the like. The upper part of the desulfurization tower is connected with a desulfurization barren liquor solvent pump, and the bottom of the desulfurization tower is connected with a desulfurization pregnant solution desorption regeneration system and is connected with the desulfurization barren liquor solvent pump and the desulfurization pregnant solution desorption regeneration system. The top of the desulfurization tower is connected with a low-pressure gas vapor-liquid separator, and is subsequently connected with a series of equipment such as a low-pressure gas hydrogen extraction adsorption tower. According to the system, sulfides in low-pressure gas are removed by using a desulfurization barren solution, and a desulfurization pregnant solution is subjected to desorption regeneration and then is recycled. The desulfurized low-pressure separated gas is subjected to the steps of gas-liquid separation, hydrogen extraction adsorption and the like, and the purity of gas hydrogen at the outlet of the top of the hydrogen extraction adsorption tower can be controlled to be greater than 95%, so that the effective utilization of energy is realized, the coal tar hydrogenation and hydrogen cost is reduced, the energy waste, environmental pollution and potential safety hazards are reduced, the ecological environment is improved, and the production safety is improved.

The application relates to the technical field of hydrogen storage performance calculation and evaluation, and discloses a solid hydrogen storage material hydrogen storage performance calculation and evaluation method and system, which comprises the following steps: using a functional density theory and a molecular dynamics method, constructing a material microcosmic model, and analyzing and designing the mechanical properties, electronic distribution, heat conduction performance and thermal stability of the material itself; calculating the adsorption state and adsorption energy of hydrogen molecules on the hydrogen storage material, and the hydrogen adsorption amount of the material under different pressures and temperatures, so as to calculate the hydrogen adsorption performance of the newly designed hydrogen storage material; and drawing a hydrogen adsorption kinetics curve of the solid hydrogen storage material, so as to calculate and evaluate the hydrogen storage kinetics performance of the material. The system comprises a performance analysis module, a performance calculation module and a performance evaluation module. The application can comprehensively improve the research and development efficiency and hydrogen storage performance of the solid hydrogen storage material in theory and actual application. Each step provides important theoretical support and data basis when solving different technical challenges.

The invention belongs to the technical field of electro-catalysis and new energy chemical industry, and relates to a composite catalyst, a preparation method thereof and application of the composite catalyst in ammonia production through electrochemical nitrate reduction. The catalyst comprises a substrate and CoCu2O nanoclusters located on the surface of the substrate, the substrate is made of a conductive metal organic framework material containing Co and Cu, and an organic ligand in the conductive metal organic framework is HHTP; non-coordinated hydroxyl exists in the substrate; co in the CoCu2O nanocluster exists in a Cu2O crystal lattice in a doping manner, and at least a (111) crystal face is exposed. CoCu2O in the catalyst serves as an efficient water dissociation and hydrogen adsorption (Had) center, and a reaction hydrogen source is continuously supplied; a large number of non-coordinated hydroxyl groups are exposed on the partially reduced substrate, a hydrogen bond network is constructed to stabilize NO3, NO2 and other key intermediates, and the energy barrier of NO3 <-> adsorption and NO hydrogenation is reduced, so that the ammonia production catalytic activity and selectivity of the NO3RR are improved, and the service life of the NO3RR is prolonged.

A hydrogen gas storage tank includes a body including a metallic bulk region and one or more protective layers adjacent to the bulk region. One or more of these protective layers comprise a number of graphyne molecules such that the one or more protective layers are configured to lower hydrogen adsorption into the bulk region when compared to a bulk region with protective layers free from graphyne.

The invention relates to a safe scavenger for inflammable and virulent hydrogen sulfide and a preparation method thereof, and belongs to the technical field of hydrogen sulfide adsorption materials. The preparation method comprises the following steps: by taking a carbon nanotube as a matrix, growing iron oxide nanoparticles on the carbon nanotube in situ, so that the dispersion and distribution uniformity of the iron oxide nanoparticles can be improved, and then carrying out Michael addition reaction on a vinyl group on the vinyl modified iron oxide loaded carbon nanotube and a secondary amino group in a hexahydro-s-triazine grafted compound, so as to obtain the composite material. Amine groups containing a large number of hexahydrotriazine groups, piperazine groups and the like can be further cross-linked and coated on the surface of the scavenger, and a hexahydrotriazine-piperazine cross-linked network polymer is formed on the surface of the scavenger; the tubular carbon nanotubes, the ferric oxide particles loaded on the surfaces of the tubular carbon nanotubes and the piperazine-hexahydro-s-triazine cross-linked network-shaped polymer coated on the surface of the hydrogen sulfide scavenger work together, so that the removal effect of hydrogen sulfide in a gas phase and a water phase is effectively improved.

The invention provides a lanthanum oxide doped molybdenum-based supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of electrocatalytic decomposition hydrogen desorption catalysts. The preparation method of the lanthanum oxide-doped molybdenum-based supported catalyst comprises the following steps: mixing ammonium molybdate or a hydrate thereof, lanthanum oxide and a modifier in water to form a mixed solution; a pretreated porous carrier is added into the mixed solution for a hydrothermal reaction, and a catalyst precursor is obtained; and roasting the catalyst precursor in an inert atmosphere, and cooling to obtain the lanthanum oxide doped molybdenum-based supported catalyst, wherein the modifier comprises at least one of ethanol, glucose and acetic acid. The doping of lanthanum oxide can adjust the electronic structure of MoO2, optimize the hydrogen adsorption free energy and improve the catalytic activity of the molybdenum-based supported catalyst, the introduced modifier inhibits MnO2 from being excessively oxidized into MoO3, the stability of the molybdenum-based supported catalyst is maintained, and the catalytic activity of the molybdenum-based supported catalyst is further enhanced.

To provide a method for easily producing a hydrogen storage material at a low cost.SOLUTION: A method for producing a hydrogen storage material, comprising allowing coral grains immersed in water stored in a water tank and placed on a mesh plate to adsorb hydrogen by allowing micro-nano bubbles of hydrogen generated by a micro-nano bubble generator immersed in water stored in the water tank and placed under the mesh plate to act on the coral grains.SELECTED DRAWING: Figure 1

The invention discloses a hydrophobic cerium-doped Cu-BTC low-temperature hydrogen storage material, which is prepared by the following steps: firstly, respectively preparing cerium-doped Cu-BTC (Cu-BTC / Ce for short) and polydimethylsiloxane PDMS (polydimethylsiloxane), and then compounding the pre-cured PDMS and Cu-BTC / Ce by a thermal degradation method to obtain the hydrophobic cerium-doped Cu-BTC low-temperature hydrogen storage material (PDMS (at) Cu-BTC / Ce for short); the obtained PDMS (at) Cu-BTC / Ce has hydrophobicity, and the water contact angle of the PDMS (at) Cu-BTC / Ce is 120-125 degrees. The preparation method comprises the following steps: 1, preparing cerium-doped Cu-BTC and polydimethylsiloxane; and 2, preparation of the hydrophobic cerium-doped Cu-BTC low-temperature hydrogen storage material. When the material is applied to the field of low-temperature hydrogen storage, the hydrogen adsorption capacity is 3.51-3.53 wt%; the hydrogen adsorption capacity of a water resistance test is 2.60-3.00 wt%, and the water resistance retention rate reaches 75-95%.

The application discloses a kind of methanol reforming and hydrogen adsorption integrated multi-field coupling reactor and the continuous hydrogen production system and hydrogen production method with it.The reactor of the application couples reforming reaction cavity, adsorption cavity, desorption cavity, and designs the inner and outer two layers of adsorbent bed layer, and the inner layer adsorption cavity is adsorbed hydrogen-rich, and the outer layer desorption cavity is responsible for desorption regeneration, hydrogen molecules pass through adsorbent lattice and diffuse from inner layer to outer layer in situ under the driving of concentration gradient, this structure allows adsorption and desorption process to be separated in space but closely coupled, without interrupting reforming reaction, to realize the dynamic cycle of adsorbent adsorption-migration-desorption, lay the foundation for continuous operation, through innovative structure and material matching, realize the efficient coupling of methanol reforming and hydrogen selective adsorption in the uniform temperature zone of reforming reaction temperature.

Hollow porous spherical nano nickel powder with the surface coated with magnesium metal is adopted as a hydrogen adsorption material and is filled in a hydrogen storage tank, a steel wool filter layer covers the upper layer, a small number of through-hole magnetic sheets are placed in the filter layer, and the through-hole magnetic sheets and the steel wool form a magnetic filter layer together; nano nickel powder escaping in the hydrogen desorption process can be adsorbed and filtered; under the pressurization condition, hydrogen molecules on the inner surface of the hollow spherical nano nickel powder are closely stacked, similar to a quasi-liquid condition, so that the hydrogen storage capacity is greatly improved; a magnesium metal coating layer is arranged on the outer surface of the hollow porous spherical nano nickel powder, an MgH2 compound can be formed, hydrogen molecules are easily adsorbed on the surface of the magnesium metal coating layer, the overall hydrogen storage capacity can be improved, heating and cooling conditions are not needed, and convenience and practicability are achieved.

The invention relates to a nickel-based hydrogen evolution reaction electrode containing a ruthenium-neodymium-iron coating and a preparation method of the nickel-based hydrogen evolution reaction electrode, and belongs to the technical field of electrochemical energy conversion, the nickel-based hydrogen evolution reaction electrode containing the ruthenium-neodymium-iron coating comprises a base net and a coating arranged on the surface of the base net, the base net is made of a porous nickel material, and the coating contains three elements of ruthenium, neodymium and iron. Ruthenium of the present invention provides excellent HER intrinsic activity close to platinum; iron effectively adjusts the electronic structure of ruthenium, hydrogen adsorption free energy is optimized, and the cost is greatly reduced; neodymium is used as a rare earth element, lattice distortion and a large number of active defects can be introduced by doping neodymium, and the binding force is enhanced; by using cheap iron and a small amount of neodymium, the dosage of noble metal ruthenium is greatly reduced (the lowest dosage is 4%), and the cost of the electrode is far lower than that of pure ruthenium or pure platinum; the porous nickel substrate provides a huge specific surface area and a stable conductive framework; and the heat-treated coating is firmly combined through a sintering treatment process, so that the long-term stability of the electrode under harsh electrolysis conditions is ensured.

The invention discloses a three-dimensional covalent organic framework material based on an adamantane three-dimensional center, a preparation method of the three-dimensional covalent organic framework material and application of the three-dimensional covalent organic framework material in hydrogen storage, and belongs to the technical field of hydrogen storage materials and preparation of the hydrogen storage materials. The hydrogen storage performance of the COF hydrogen storage material is further improved. According to the invention, TFPA and diamino monomers containing different numbers of benzene rings are taken as raw materials, covalent organic framework materials with different chain link lengths and a three-dimensional space network structure are constructed, the material has a dia topological structure, the three-dimensional structure enables pore channels to be complex, and the material has obvious advantages in gas adsorption. Test results show that when adamantane is taken as the three-dimensional center of the three-dimensional covalent organic framework material, the interpenetration degree is increased along with the increase of the length of the chain link, and different interpenetration structures have different hydrogen adsorption effects. When an organic chain link is short, a non-interspersed structure is more likely to be formed, at the moment, a higher specific surface area and more exposed active sites are achieved, and hydrogen storage is more facilitated.

The application provides a method for improving hydrogen adsorption performance of a covalent organic framework material, comprising the following steps: providing a covalent organic framework material containing an imine bond, and placing the covalent organic framework material in hydrochloric acid vapor for protonation treatment; the application also provides a protonated covalent organic framework material and a use of the protonated covalent organic framework material as a hydrogen storage medium.

The application discloses a silicon-based solid high-density hydrogen storage material, a synthesis method and a hydrogen adsorption silicon method, wherein the synthesis method of the silicon-based solid high-density hydrogen storage material comprises the following steps: taking silicon chip cutting discarded silicon dust powder / silicon mud as a basic raw material, and obtaining silicon micro powder with nanometer size after cleaning and drying; the purity of the silicon micro powder is set to be 4.8N or more, the size is 50-200nm, and D50=80-130nm; the silicon micro powder is synthesized with calcium metal to form layered calcium silicide, specifically, the silicon micro powder is synthesized with calcium micro powder to form layered calcium silicide, then calcium ions existing between the layered calcium silicide layers are removed, and layered siliconene is obtained, and the density of the layered siliconene is 1.5g / cm 3 The silicon-based solid high-density hydrogen storage material, the synthesis method and the hydrogen adsorption silicon method provided by the application modify the basic crystal lattice structure of silicon material into a layered stacked siliconene structure, form a quasi-two-dimensional substance arranged in a honeycomb lattice plane, and have a wave mesoscopic / microscopic structure, and a large amount of hydrogen atoms can be adsorbed between the layers.

The invention relates to the technical field of hydrogen evolution catalysts, in particular to an interface-strong-coupling ruthenium-based alkaline hydrogen evolution catalyst and a preparation method thereof. The preparation method comprises the following steps: mixing acid-washed and dried titanium dioxide, ruthenium salt and a reducing agent, and drying to obtain a precursor; and calcining the precursor in an ammonia atmosphere to obtain the catalyst. The catalyst comprises a TiO2 carrier and a Ru active component, wherein a strong coupling interface Ru-N-Ti structure is arranged between the TiO2 carrier and the Ru active component. According to the invention, a strong coupling interface Ru-N-Ti structure is constructed on the interface of Ru and TiO2, so that the redistribution of electrons from Ti to Ru is realized, the Lewis acidity of Ti is enhanced, the adsorption of H2O and the breakage of H-OH bonds are promoted, and rapid water dissociation and sufficient supply of protons are realized; meanwhile, Ru realizes an electron-rich state, so that the hydrogen adsorption energy of Ru is optimized; the alkaline hydrogen evolution catalytic performance is improved from the two aspects of strong hydrolysis capacity and weak hydrogen adsorption capacity.

The invention discloses an interlayer cleaning device and method for an electric arc fuse wire additive 7-series aluminum alloy, and belongs to the technical field of metal additive manufacturing. Comprising a bearing plate connected with an external additive mechanical arm, a lifting translation adjusting assembly installed on the bearing plate, a chamber cover in driving connection with the lifting translation adjusting assembly, a lifting fine adjustment assembly installed in the chamber cover, a cleaning assembly connected with the lifting fine adjustment assembly and a closed-loop gas protection assembly located on the cover wall of the chamber cover. Through the mechanism of annular surrounding heating, precise flexible cleaning, closed-loop inert protection and dynamic synchronous movement, dynamic synchronous integration of the cleaning action and additive printing is achieved, precise cleaning of a to-be-deposited area can be completed without interlayer pause, secondary oxidation and hydrogen adsorption are inhibited from the source, the porosity and inclusion defects are remarkably reduced, and the deposition efficiency is improved. And meanwhile, the production efficiency and the mechanical property of a formed part are improved to the maximum extent, and the efficiency and quality problems of 7-series aluminum alloy additive manufacturing are solved.

This invention relates to the field of hydrogen storage technology and discloses a micro / nano spherical CoMn2O4 hydrogen storage material catalyst. The catalyst is characterized by: dissolving cobalt and manganese sources in an ethylene glycol solution at a molar ratio of 1:2 to 2.5; adding urea and glucose and stirring until homogeneous to obtain a mixed solution; subjecting the mixture to a hydrothermal reaction at 180-220°C; centrifuging, washing, and drying to obtain a powder; and finally heating the powder in a muffle furnace at 450-850°C until oxidation is complete. The molar ratio of ethylene glycol, urea, glucose, and cobalt source is 140-150:9-11:0.2-0.3:1. When this catalyst is combined with magnesium hydride, the dehydrogenation capacity reaches 6.04 wt.% within 9 minutes at 300°C, and the hydrogen absorption capacity is 5.01 wt.% within 3 minutes at 150°C. In comparison, even with ball milling of MgH2 for 20 minutes, the hydrogen absorption capacity only reaches 4.55 wt.%. Furthermore, the composite material exhibits a high cycle life: after 100 hydrogen adsorption / desorption cycles at 300°C, the hydrogen storage capacity shows no significant change, with a capacity retention rate of 99.95%. The catalyst preparation method is simple, and the raw materials are readily available, making it suitable for large-scale production.

The application provides a method, an apparatus and a device for evaluating a dynamic diffusion of natural hydrogen in rock pores. The method includes: performing, at a target pressure and a target temperature, a simulation calculation of a natural hydrogen adsorption based on a pre-constructed pore model of a rock to be evaluated, and determining an average number of hydrogen molecules adsorbed in the rock pores when the natural hydrogen is saturated at the target pressure and the target temperature; determining a natural hydrogen content, based on lithologic parameters, the average number of hydrogen molecules, the target pressure and the target temperature; adding one or more preset gases to the pre-constructed pore model, determining a loss content of the natural hydrogen, and determining a diffusion coefficient of the natural hydrogen; determining a diffusion evaluation parameter, based on the natural hydrogen content, the loss content and the diffusion coefficient.

This invention belongs to the field of electrocatalysis, specifically relating to a high-entropy alloy heterostructure electrocatalyst, its preparation method, and its application. This invention prepares a nanoscale high-entropy alloy heterostructure electrocatalyst via a simple two-step low-temperature oil-phase method. The high-entropy alloy is distributed on carbon nanotubes and forms a heterostructure with Ni, adjusting the electronic structure and optimizing the hydrogen adsorption energy of the catalyst, making it an excellent electrocatalytic hydrogen evolution catalyst.