215 results about "Magnesium hydride" patented technology

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 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 a method for preparing micro-nano magnesium hydride powder, which comprises the following steps: in a vacuum environment I, heating a magnesium raw material to form magnesium steam, and simultaneously introducing trace carrier gas I; in the vacuum environment II, magnesium steam is conveyed through the trace carrier gas I to be mixed with the carrier gas II to form mixed gas, meanwhile, the mixed gas is made to rapidly flow through the injection evacuator, the magnesium steam is cooled and hydrogenated, and the micro-nano magnesium hydride powder is formed. Compared with the prior art, the gasification efficiency of magnesium is higher, the magnesium is taken away by airflow, residues in an evaporation chamber are less, the utilization rate of the magnesium is high, produced magnesium powder is directly brought into the next link through hydrogen carrier gas, the processes of passivation, bin opening, powder taking and the like are omitted, magnesium powder conveying is more efficient and safer, and the production cost is reduced. Through the pre-hydrogenation of the magnesium powder and the shearing action of the carrier gas of the high-speed hydrogen, the generated magnesium powder particles are smaller, the magnesium hydride powder particles generated after hydrogenation are smaller, the activity is better, and the technical process is easier to realize large-scale amplification and automatic control.

The invention aims at disclosing a magnesium hydride continuous production device and process, and relates to the technical field of magnesium hydride preparation, the magnesium hydride continuous production device comprises a sealing shell, a heating inner container, a power assembly, a feeding assembly, a discharging assembly, an inert gas replacement assembly and a hydrogenation inlet; the heating inner container comprises a side wall, a feeding end and a discharging end, a plurality of gas one-way valves are arranged on the side wall, a spiral propeller, a plurality of steel balls and / or a plurality of steel bars are arranged in the heating inner container, and a filter screen is arranged at the discharging end; a conical part and a recycled material port are arranged at the bottom of the sealed shell; the feeding assembly comprises a feeding lock hopper and a feeding pipe, and the feeding pipe communicates with the feeding end. The discharging assembly comprises a discharging pipe and a discharging lock hopper, and the discharging pipe is communicated with the discharging end; the method has the technical effects that the particle size of the magnesium powder is 10-300 microns, the particle size of the produced magnesium hydride is 50-800 nm, continuous feeding, continuous reaction and continuous discharging can be realized, large-scale production of the magnesium hydride is realized, and the hydrogen storage density of the magnesium hydride is not less than 7 wt%.

The invention discloses a composite material with GO simultaneously loaded with Ni-TiO2, which is characterized in that tetrabutyl titanate, dimethylformamide, nickel nitrate hexahydrate, terephthalic acid and a single-layer graphene aqueous solution are used as raw materials, Ni-MOF / Ti-MIL-125 is obtained through a solvothermal method, then Ni and Ti are compounded with GO by using the hydrolysis characteristic of an MOF material to obtain Ni-Ti-GO, and finally Ni-TiO2-GO is obtained through a calcination method. A preparation method of the Ni-MOF / Ti-MIL-125 composite material comprises the following steps: 1, preparing Ni-MOF / Ti-MIL-125; 2, preparation of Ni-Ti-GO is carried out; and 3, the preparation of the Ni-TiO2-GO is carried out. When the magnesium hydride composite hydrogen storage material based on Ni-TiO2-GO is applied as a hydrogen storage material, the initial dehydrogenation temperature is 182-205 DEG C, and when the dehydrogenation temperature is 250 DEG C, the hydrogen desorption amount is 3.66-3.82 wt%; under the conditions that the hydrogen absorption temperature is 30 DEG C and the hydrogen absorption time is 3550-3600 seconds, the hydrogen absorption amount is 1.80-1.81 wt%.

The utility model relates to the technical field of hydrogen production equipment, and provides a continuous controllable magnesium hydride hydrolysis hydrogen production device which comprises a tank body, the lower end of the tank body is provided with a material inlet; a supporting seat is mounted in the material inlet / outlet; a telescopic spring is arranged in the supporting seat; a gas outlet is formed in the top of the tank body; a water inlet is formed in the top of the tank body; a motor is arranged at the top of the tank body, and the output end of the motor is connected with a rotary cutter through a magnetic sealing piece; the magnetic sealing element is communicated with the water inlet; the rotary cutter is positioned at the top of the inner cavity of the tank body; the rotary tool comprises a circular rotary platform and a plurality of tool bits arranged on the circular rotary platform. And a water nozzle for spraying water is arranged on the tool bit. According to the utility model, the continuity of hydrolysis reaction can be enhanced, and the influence on the reaction due to the generation of an additional magnesium hydroxide adhesion layer is effectively prevented.

The invention discloses hydrogen slow-release particles based on biochar-magnesium hydride and a preparation method of the hydrogen slow-release particles. The hydrogen slow-release particles are formed by mixing magnesium hydride with the purity larger than 99%, biochar and an adhesive. The high-purity magnesium hydride finished product is adopted, the environment heavy metal pollution repairing function of the biochar is utilized, the hydrogen release time in magnesium hydride is prolonged, crop growth and environment pollution repairing are promoted through controllable slow-release hydrogen, and crop growth is promoted.

The present disclosure relates to the technical field of solid-state hydrogen storage materials, and specifically provides a magnesium-based hydrogen storage material based on a core-shell structure, a preparation method therefor, and use thereof. The magnesium-based hydrogen storage material based on a core-shell structure provided by the present disclosure comprises a hydrogenated combustion product of Ni / Fe3O4@MIL and MgH2, wherein Ni / Fe3O4@MIL is a material having a core-shell structure. An inner core of Ni / Fe3O4@MIL comprises Ni-loaded Fe3O4 microspheres, and an outer shell of Ni / Fe3O4@MIL comprises an organic ligand. The magnesium-based hydrogen storage material based on a core-shell structure significantly improves the hydrogen storage performance of magnesium hydride, and can still maintain a high hydrogen absorption capacity at a low temperature.

The invention discloses a lattice distortion and entropy value-based high-entropy alloy screening method, which comprises the following steps of: firstly, simultaneously calculating the lattice distortion degree and entropy value of a high-entropy alloy, and then determining the components of the high-entropy alloy meeting the requirements according to the screening requirements; according to the Hume-Rother alloy solid solution theory, the lattice distortion degree is calculated; the lattice distortion degree must be greater than or equal to 8.7%, and the upper and lower limit difference must be greater than or equal to 2.0%; entropy calculation is carried out based on the statistical definition of the concept of mixed entropy in statistical mechanics; the entropy value must be greater than or equal to 1.5 R. The obtained TiFeMnCoVZr high-entropy alloy only contains a Laves phase, and when the TiFeMnCoVZr high-entropy alloy is used as a magnesium hydride hydrogen storage material, the maximum hydrogen absorption amount can reach 4.7 wt.%, the maximum hydrogen desorption amount is 4.6 wt.%, and the hydrogen desorption activation energy is 68.9 kJ / mol.

The utility model relates to a hydrogen purification system based on magnesium-based hydride, which comprises a buffer tank, a gas inlet of the buffer tank is connected with a discharge end of a hydrogen purification module through a first gas path header pipe, and a vacuum pump is mounted on the first gas path header pipe in a matched manner. An exhaust port of the buffer tank is connected with a feeding end of the hydrogen purification module through a second gas path header pipe, a metal hydrogen storage material is arranged in the hydrogen purification module, and a feeding port of the buffer tank is connected with an exhaust port of the feed gas storage device through a third gas path header pipe. By arranging the hydrogen purification module, hydrogen components in raw material gas can be absorbed based on magnesium hydride, and compared with some traditional physical and chemical purification schemes, the production cost is low; meanwhile, the number of hydrogen storage tanks in the hydrogen purification module can be reasonably set according to purification requirements, the use flexibility is good, the purity of obtained hydrogen is high, no other impurity gas is mixed in the purification process, and the working efficiency of the system is high.

The invention aims to disclose a magnesium hydride large-scale production device and production process, and relates to the technical field of magnesium hydride preparation, the magnesium hydride large-scale production device comprises a magnesium powder buffer tank, a high-temperature and high-pressure hydrogenation reactor, a magnesium hydride buffer tank and a finished product tank; a feeding pipe is arranged between the magnesium powder buffer tank and the high-temperature and high-pressure hydrogenation reactor, and the feeding pipe is provided with a first valve; a double-helix stirring shaft is arranged in the high-temperature and high-pressure hydrogenation reactor, and a second valve is arranged on the discharging pipe; a spiral drill bit is arranged at the bottom of the double-spiral stirring shaft, extends into the discharging pipe and is close to the second valve; the high-temperature and high-pressure hydrogenation reactor is provided with a high-pressure hydrogen inlet, and a plurality of temperature sensors are arranged on the inner wall of the high-temperature and high-pressure hydrogenation reactor. The high-temperature and high-pressure hydrogenation reactor has the technical effects that high-pressure hydrogen is introduced under the condition that the first valve and the second valve are closed, and magnesium hydride is generated in the process that the double-helix stirring shaft rotates reversely to stir magnesium powder; and the second valve is opened, and the double-helix stirring shaft rotates forwards and drives the magnesium hydride powder to fall into the magnesium hydride buffer tank from the discharging pipe.

The invention discloses nanoscale simple substance Ni which is prepared by taking nickel chloride hexahydrate, sodium hydroxide and 1, 2-propylene glycol as raw materials and performing water bath heating reduction through a reducing agent hydrazine hydrate. The size of the obtained nanoscale simple substance Ni is 5-10 nm, and particles are uniformly dispersed and are stable in structure. MgH2 and the prepared nanoscale simple substance Ni are subjected to ball milling, and the magnesium hydride composite hydrogen storage material based on the nanoscale simple substance Ni as the catalyst, namely Ni / MgH2 for short, can be obtained. The initial dehydrogenation temperature of the obtained Ni / MgH2 hydrogen storage system is 195 DEG C; under the conditions that the dehydrogenation temperature is 325 DEG C and the dehydrogenation time is 500 seconds, the dehydrogenation amount is 6.5 wt%; under the conditions that the hydrogen absorption temperature is 150 DEG C and the hydrogen absorption time is 1000 seconds, the hydrogen absorption amount is 4.0 wt%. The prepared catalyst is used for catalyzing MgH2 reaction and has the characteristics of high activity, high selectivity and high stability. The preparation method disclosed by the invention is low in cost, simple in steps, relatively good in repeatability and easy for mass production, and the obtained elemental Ni has a good catalytic effect.

The invention discloses an application method of magnesium hydride in hydroponic seedling hardening of rubber trees, which comprises the following steps: improving Hoagland into a hydroponic nutrient solution, adding magnesium hydride into the nutrient solution, and adjusting the pH value; the method comprises the following steps: selecting rubber tree stable-period test-tube plantlets which meet plant height requirements, have roots, stems and leaves and are pollution-free; and taking out the test-tube plantlet from the test tube, cleaning the culture medium on the root system, soaking with a carbendazim solution, and putting into a nutrient solution for hydroponic seedling hardening. According to the invention, 5-20mg of magnesium hydride is added into each liter of nutrient solution, so that the solution is in a hydrogen-rich state, the seedling hardening survival rate is obviously improved, and the plant quality is improved. Compared with a control group, the optimal concentration has the advantages that the seedling hardening survival rate is obviously improved, and the seedling hardening survival rates under the temperature conditions of 25 DEG C and 20 DEG C are respectively improved by 30% and 11%; the plant height and the stem diameter are respectively increased by 11.86% and 13.33% at the temperature of 25 DEG C, and reach an extremely remarkable level. The method provides support for improvement of a rubber tree seedling raising technology.

The invention relates to the field of magnesium-based hydrogen storage materials, and discloses a magnesium hydride powder preparation method which comprises the following steps: S1, material preparation: feeding a hydrogenation powder preparation raw material into a smelting crucible of gas atomization equipment, melting the hydrogenation powder preparation raw material through the smelting crucible, and heating to a hydrogenation powder preparation process temperature to obtain molten metal; and S2, atomization powder preparation and hydrogenation are conducted, specifically, hydrogenated mixed gas meeting technological parameters is supplied through a gas generation mechanism, the hydrogenated mixed gas is guided into gas atomization equipment, and the molten metal obtained in the S1 is converted into magnesium hydride powder through the hydrogenated mixed gas. According to the scheme, magnesium hydride which is stable in property and has a certain hydrogen content is directly prepared through the magnesium ingot, the deep powder hydrogenation process period is shortened, and the process route is safer and more controllable, so that an existing process route is replaced.

The invention discloses a preparation method of a multivalent regulation hydrogen storage material of magnesium hydride (at) TMx < + > / TM-MXene, and relates to a preparation method of a hydrogen storage material. The invention aims to solve the problem that the hydrogen storage material prepared by the existing method is poor in cycling stability and hydrogen storage performance. The method comprises the following steps: 1, preparing V2C powder; 2, preparing TMx < + >-MXene; and 3, preparing MgH2 (at) TM < x + > / TM-MXene. The invention provides a multivalent regulation and control strategy for bidirectionally enhancing Mg / MgH2 dehydrogenation / hydrogenation kinetics, TM / TMx < + > is successfully doped into V2C, MgH2 (at) TM / TMx < + >-V2C is obtained after ball milling, the composite materials have remarkable catalytic activity on adsorption and desorption of hydrogen, and a new guiding mode is provided for bidirectionally and synchronously improving the kinetics performance.

The invention discloses a hydrogen slow-release composite material based on moisture self-regulation and a hydrogen slow-release device and method.The composite material comprises, by mass, 15-25 wt% of a hydrogen production component, and the hydrogen production component comprises a solid hydrogen production material and is used for reacting with water to release hydrogen; the water absorption component is used for absorbing and retaining water; 5-25 wt% of a water-consuming component for reacting with water to consume water; wherein the total solid water amount corresponding to the water absorption component and the water consumption component is greater than the theoretical water amount required by complete reaction of the hydrogen production component; the raw materials are mixed, compacted and molded to obtain the hydrogen slow-release composite material. When external water supply fluctuates, the material system can spontaneously adjust moisture entering a reaction environment, so that the effective water consumption participating in the hydrolysis reaction of magnesium hydride is more stable, the hydrogen production process is easier to maintain a slow and stable release state, and the dependence on high-precision external water supply equipment and complex control links is reduced.

The invention belongs to the technical field of hydrodesulfurization, and particularly relates to a butyl phosphonic acid modified magnesium-based hydrodesulfurization material and a preparation method thereof. The magnesium-based hydrodesulfurization material is prepared from the following raw materials: magnesium, carbon black and butyl phosphonic acid, and the preparation method comprises the following steps: adding the magnesium into the carbon black for ball milling; carrying out hydrotreating on a solid product obtained by ball milling; adding the hydrotreated solid product into butyl phosphonic acid for ball milling; and carrying out heat treatment on a solid product obtained by ball milling in the previous step to prepare the butyl phosphonic acid modified magnesium-based hydrodesulfurization material. Magnesium hydride in the magnesium-based hydrodesulfurization material is used as a high-activity hydrogen source for hydrodesulfurization of dibenzothiophene in an anthracene oil liquid phase, and high temperature and high pressure are not needed in the hydrodesulfurization process; the surface of magnesium hydride is modified by butyl phosphonic acid, so that dibenzothiophene molecules stand and are adsorbed on the surface of magnesium hydride, a direct hydrogenolysis desulfurization reaction is carried out, and a benzene ring is not subjected to hydrogenation saturation, so that the selectivity of the hydrodesulfurization reaction can be improved.

The invention relates to nano magnesium hydride powder and a preparation method thereof, and belongs to the technical field of magnesium hydride preparation. The preparation method of the nano magnesium hydride powder comprises the following steps: ultrasonically dispersing a composite base material, an auxiliary agent and deionized water, slowly dropwise adding a modified solution, heating, stirring and filtering, taking out a product, washing, and carrying out vacuum drying and calcining in a drying oven to obtain a composite coating body; magnesium hydride and the composite coating body are placed in absolute ethyl alcohol to be subjected to ultrasonic treatment, ball milling is conducted after vacuum drying is conducted, and the composite coating body is obtained. According to the technical formula provided by the invention, through the synergistic effect of the composite base material, the sodium alginate and the aluminum-zirconium coupling agent, the hydrogen storage capacity and the dehydrogenation rate of the nano magnesium hydride powder are remarkably improved, and the cycling stability is enhanced.

The application relates to the hydrogen production technical field, and discloses a hydrogen storage material based on magnesium hydride, a preparation method thereof and a hydrolysis hydrogen production method, which comprises a block structure formed by co-molding powdery magnesium, powdery magnesium hydride, powdery alkali metal salt or alkali earth metal salt, wherein the magnesium accounts for 16-22% in weight percentage, the magnesium hydride accounts for 70-76% in weight percentage, and the alkali metal salt or alkali earth metal salt accounts for 8% in weight percentage. The hydrogen storage material prepared by the application has high strength, high hydrogen storage density and fast hydrolysis performance, and is particularly suitable for stable hydrogen supply in a low-temperature environment such as a field.

The invention discloses a template agent P123-based 3DNSi / Nb-O composite material, niobium oxalate is used as a niobium source, ammonium fluotitanate is used as a titanium source and a fluorine ion regulator, boric acid is used as the fluorine ion regulator, and P123 is used as a template agent, and the preparation method comprises the following steps: firstly, preparing 3DNSi / Nb-O through a hydrothermal method, and then carrying out heat treatment to remove P123. The 3DNSi / Nb-O is anatase type TiO2, and the Nb element is doped into a TiO2 crystal lattice; the oxygen vacancy microstructure is of a three-dimensional structure composed of nanosheets; and the specific surface area is 25-35 m < 2 > / g. The niobium source is niobium oxalate; the titanium source is ammonium fluotitanate; the fluorine ion regulator is boric acid, and in addition, the ammonium fluotitanate is also the fluorine ion regulator; the template agent is P123. The invention discloses a magnesium hydride composite hydrogen storage material based on 3DNSi / Nb-O and a preparation method of the magnesium hydride composite hydrogen storage material. The initial hydrogen desorption temperature of the obtained MH-3DNSi / Nb-O is 185-230 DEG C; the hydrogen desorption amount is 6.0 to 6.5 weight percent; when the number of times of hydrogen absorption and desorption is 1000-1500, the hydrogen storage capacity is not obvious, and the hydrogen desorption capacity is kept at 6.9-7.1 wt.%.

The invention relates to the technical field of hydrogen storage materials, and particularly discloses a slurry-like hydrogen storage material and a preparation method thereof.The slurry-like hydrogen storage material is prepared by mixing metal hydride, a liquid organic hydrogen carrier and an additive, and the preparation method includes the steps that one of magnesium hydride (MgH2), sodium-aluminum hydride (NaAlH4) and calcium hydride (CaH2) is selected as the metal hydride, and the other one of magnesium hydride (MgH2), sodium-aluminum hydride (NaAlH4) and calcium hydride (CaH2) is selected as the additive; one of methyl cycloolefin (MCH) and tetrahydronaphthalene is selected as a liquid organic hydrogen carrier, and polyvinyl alcohol (PVA) or polyurethane (PU) is selected as an additive. According to the preparation method disclosed by the invention, by optimizing the compounding ratio of the metal hydride to the liquid organic hydrogen carrier, enhancing interface contact, improving the stability of the material and strictly controlling storage and operation conditions, the problems of hydrogen storage capacity, hydrogen storage efficiency, stability and the like of a traditional slurry hydrogen storage material are solved, and the hydrogen storage material has relatively good performance and relatively high hydrogen storage capacity.

The invention discloses a La-containing high-entropy alloy and a preparation method thereof.The preparation method comprises the steps that smelting is conducted according to the molar ratio of Ti to Mn to Fe to Co to Ni to La being 1: 1: 1: 1: 1: 0.1, and the mass of La is additionally increased by 3 wt% of burning loss mass; meanwhile, a CoFe phase, a NiTi phase and a FeNi phase are included; and the particle size is 100-200 meshes. The invention relates to a preparation method of a magnesium hydride hydrogen storage material based on a La-containing high-entropy alloy. The preparation method comprises the step of carrying out ball milling on HEA-La and MgH2. The obtained magnesium hydride hydrogen storage material based on the La-containing high-entropy alloy is applied to the field of hydrogen storage, when the doping amount of a catalyst is 10 wt%, the initial hydrogen desorption temperature is reduced to 179.44-180.33 DEG C, and the hydrogen desorption amount reaches 6.46-6.45 wt%; under the conditions that the dehydrogenation temperature is 300 DEG C and the dehydrogenation time is 30 minutes, the hydrogen desorption amount is 6.17-6.78 wt%; under the conditions that the hydrogen pressure is 3 Mpa, the hydrogen absorption temperature is 170 DEG C and the hydrogen absorption time is 5 min, the hydrogen absorption amount is 5.23-5.24 wt%.

The present invention relates to the technical field of the preparation of magnesium hydride, and particularly relates to a preparation process for a compacted magnesium hydride block based on magnesium having multiple interstitial spaces. The preparation process comprises: subjecting a strip-shaped magnesium sheet to compression molding in a regular cavity to obtain a compacted magnesium block, wherein interstitial spaces used for storing heat are formed inside the compacted magnesium block; and heating the compacted magnesium block in a sealed reaction space with a pressure higher than normal pressure, introducing hydrogen and bringing same into contact with the compacted magnesium block, and bonding the compacted magnesium block and the hydrogen within a set period of time to obtain a compacted magnesium hydride block. Further disclosed is a preparation device for a compacted magnesium hydride block, which device comprises a reaction kettle, a heating frame, a temperature detection device, a pressure detection device, a control module, a heat exchange system and a gas pipeline system. In the present application, by using the compacted magnesium block and the preparation device for a compacted magnesium hydride block in combination, the problem of high power consumption during traditional magnesium hydride preparation is solved, no alloy needs to be added to magnesium to promote a reaction, energy can be effectively utilized, heat energy loss can be reduced, and stable control can be achieved.

The invention discloses a magnesium hydride film and a preparation method and application thereof, and the preparation method comprises the following steps: step 1, coating a heptane solution of dibutyl magnesium on a substrate after ultrasonic cleaning, and regulating and controlling the thickness of the MgH2 film; 2, vacuum drying is carried out, and dibutyl magnesium loaded on the substrate is obtained; and 3, hydrogen with the pressure of 6-9 MPa is introduced into the product obtained in the step 2, the temperature is increased to 200-350 DEG C for hydrogen absorption, and the MgH2 thin film coated on the substrate is obtained. In the first step, the substrate is a silicon wafer, glass or aluminum foil. The substrate is subjected to ultrasonic cleaning in an ethanol solution, and the mass fraction of the ethanol solution is 20-80%; and the concentration of the heptane solution of dibutyl magnesium is 0.1-5.0 M / L. The coating frequency is 2-3 times. The thickness of the MgH2 film is regulated and controlled by changing the concentration of the dibutyl magnesium solution and increasing and decreasing the coating times. According to the method, the requirement for equipment for preparing the MgH2 thin film can be lowered, and the preparation efficiency is improved.

The invention discloses a monatomic palladium-loaded titanium dioxide graded nanosphere for catalyzing magnesium hydride, and belongs to the technical field of hydrogen storage alloys and preparation thereof. The magnesium-based hydrogen storage material solves the problem that the existing magnesium-based hydrogen storage material has poor dynamic and thermodynamic properties and cannot meet the actual application requirements. The preparation method comprises the following steps: firstly, taking isopropyl titanate, diethylenetriamine and isopropanol as raw materials, preparing HA-TiO2 powder which exposes a large amount of {001} high-activity crystal faces by adopting a hydrothermal method, and further uniformly distributing monatomic Pd on the surface of the HA-TiO2 powder by adopting a chemical impregnation-reduction method to obtain Pd / TiO2 powder. The obtained Pd / TiO2 powder is used as a catalyst for catalyzing MgH2 hydrogen storage, the dehydrogenation temperature of a hydrogen storage material can be remarkably reduced, the hydrogen absorption / desorption rate is increased, and rapid hydrogen absorption at the room temperature is achieved.

The invention discloses a method for preparing magnesium borohydride by a solution method, and relates to the technical field of hydrogen storage materials. The method comprises the following steps: dissolving MgCl2 in tetrahydrofuran to form a magnesium source solution, dissolving NaBH4 in isopropylamine to form a boron-hydrogen source solution, mixing the two solutions, and stirring to react; carrying out centrifugation and microfiltration membrane suction filtration separation on the reacted mixture to remove solid impurities so as to obtain a clarified filtrate; and carrying out vacuum desolventizing treatment on the filtrate to finally obtain solid magnesium borohydride. The method is simple in process flow, can be completed under mild conditions, and has the advantages of low raw material cost and high operation safety; the prepared magnesium borohydride product has excellent performance of lower initial hydrogen desorption temperature, and the temperature is only 115.8 DEG C. The method is especially suitable for large-scale industrial production.

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 application discloses a preparation method of a black phosphorus doped magnesium-based novel hydrogen storage material, and the method comprises the following steps: mixing and ball-milling black phosphorus micro powder and magnesium powder obtained through electrochemical exfoliation under an inert gas atmosphere, and performing ultrasonic crushing to obtain a nano Mg / BP composite material; and performing heat treatment on the nano Mg / BP composite material under an H2 atmosphere to obtain a nano MgH2 / BP hydrogen storage material. The method uses cheap magnesium powder as raw material, embeds the magnesium powder between expanded black phosphorus layers by using a simple method combining ball-milling and ultrasonic crushing, uses lone pair electrons of the black phosphorus as anchor points to solve the problem of easy agglomeration of magnesium powder nanoparticles, simultaneously uses a large specific surface area of the black phosphorus and strong physical adsorption characteristics of the black phosphorus on hydrogen to expand the capacity of the hydrogen storage material, and finally uses the attraction ability of the lone pair electrons of the black phosphorus on high-valence magnesium in magnesium hydride to weaken Mg-H bonds and effectively reduce the dehydrogenation temperature. The preparation method has the advantages of low cost, short cycle, strong repeatability and wide application prospect in the field of hydrogen energy.

The application relates to a composite catalytic system for accelerating hydrogen production by magnesium hydride hydrolysis and a preparation method and application thereof, relates to the technical field of hydrogen production by magnesium hydride hydrolysis, and solves the problem that the existing hydrogen production by magnesium hydride hydrolysis reaction has large mass transfer resistance in the later stage and it is difficult to realize rapid and complete conversion of MgH2 under mild conditions. The composite catalytic system is composed of independently mechanically ball-milled pre-activated magnesium hydride powder and cerium chloride powder. In an inert atmosphere, the magnesium hydride powder is independently mechanically ball-milled for pretreatment to obtain activated magnesium hydride powder; the activated magnesium hydride powder and the cerium chloride powder are uniformly mixed according to a set molar ratio to obtain a cerium-based composite catalytic system. The above cerium-based composite catalytic system is added into water to initiate a hydrolysis reaction for hydrogen production at 20-60 DEG C. The catalytic system can stably meet the rapid gas production demand of a portable hydrogen supply device, has catalytic efficiency and cost advantages, and is suitable for large-scale application in actual scenes.

The application discloses a kind of hydrogen-rich physiotherapy products and preparation method thereof, belong to medical health technical field.The application first uses propyl gallate as main modifier to modify magnesium hydride and magnesium powder, and obtains modified magnesium powder and modified magnesium hydride;After adding natural medicinal plants and hydrogen-rich components (modified magnesium powder and modified magnesium hydride etc.) in hot compress product, increase traditional Chinese medicine physiotherapy and hydrogen therapy function while hot compress physiotherapy, realize the multifunctionalization of hot compress product;Meanwhile, the unique surface coating material is used to physically wrap magnesium powder and magnesium hydride without affecting its physical and chemical properties, which can prevent the product from reacting with water and oxygen during storage, and also does not hinder the reaction of hot steam with magnesium powder and magnesium hydride, thereby accelerating the hydrogen release amount and release speed.