24results about How to "Improve hydrogen storage performance" patented technology

The invention provides a high-capacity hydrogen storage alloy and a preparation method thereof. According to the method, the ferrovanadium alloy serves as a base body, rare earth is adopted for refining the ferrovanadium alloy, metal elements are doped, and the heat treatment process is further optimized. The hydrogen storage alloy comprises the following elements: TiaCrb (FeV + zwt.% RE) xMy, FeV represents a vanadium-iron alloy; rE represents a rare earth element, and z represents a doping amount; m comprises at least one element of Mn, Co, Ni, Cu, Zr, Zn, Al and Mo; a, b, x and y respectively represent the number of atoms of Ti, Cr, FeV and M, a + b + x + y = 100, 10 < = a < = 60, 0 < = b < = 70, 10 < = x < = 70, 0 < = y < = 10, and 0 < = z < = 10. The maximum hydrogen absorption amount of the prepared hydrogen storage alloy is 3.3 wt% or above at the temperature of 25 DEG C and the pressure of 9 MPa; the effective hydrogen absorption amount is more than 2wt%.

The composition general formula of the vanadium-based hydrogen storage alloy is VxTiyCrzCCe, x is larger than or equal to 0.7 and smaller than or equal to 0.8, y is larger than or equal to 0.04 and smaller than or equal to 0.1, z is larger than or equal to 0.1 and smaller than or equal to 0.18, x + y + z = 1, and a is larger than or equal to 0.001 and smaller than or equal to 0.005. The prepared vanadium-based hydrogen storage alloy has the advantages that the preparation process is simple, the hydrogen storage alloy which is easy to activate, high in capacity and good in cycling stability can be obtained by adding trace Ce, and the vanadium-based hydrogen storage alloy is suitable for large-scale generation preparation and commercial application. The alloy is prevented from being locally oxidized in the smelting process due to a small amount of Ce element, and the problem that the hydrogen absorption capacity is reduced due to excessive rare earth elements is avoided, so that the activation performance of the alloy is improved, and meanwhile, the high hydrogen storage capacity is obtained.

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 TiO2-x (F) powder, a preparation method thereof and application of the TiO2-x (F) powder in strengthening the performance of a solid hydrogen storage material, and belongs to the technical field of hydrogen storage materials and preparation of the hydrogen storage materials. The problems that an existing magnesium-based solid hydrogen storage material is high in hydrogen desorption temperature, slow in low-temperature dynamics and the like are solved. According to the preparation method, the fluorinated transition metal Ti oxide additive doped with the oxygen vacancies is prepared, electrons of Mg are captured by utilizing the strong electronegativity of F atoms on the surfaces of transition metal Ti atoms, MgF2 active catalytic species are generated in the hydrogen absorption and desorption process, and the hydrogen storage performance of MgH2 is further improved. Meanwhile, the construction of oxygen vacancies on the surface of the transition metal Ti atom can provide active sites for Mg / MgH2 nucleation growth, can greatly accelerate the flow of electrons in the hydrogen absorption / desorption process, improves the thermal / dynamic performance, and realizes the reversible hydrogen absorption / desorption of the magnesium-based hydrogen storage material at low temperature.

The invention discloses preparation and application of an Nb2O5 doped nano disc-shaped MOF derivative composite material, the main components of the composite material are Nb, Ti and O, and the shape of the composite material is a disc-shaped nanosheet with the diameter of 100-300 nm and the thickness of 50-70 nm under scanning electron microscopy. According to the preparation method, a Nb2O5 / MIL-125 composite material is obtained through a hydrothermal method and tubular furnace calcination, and the preparation method of the MgH2-based hydrogen storage material based on Nb2O5 / MIL-125 comprises the steps that in a glove box filled with argon, Nb2O5 / MIL-125 and MgH2 are mixed and then subjected to bidirectional ball milling. According to the application of the MgH2-based hydrogen storage material based on the Nb2O5 / MIL-125 as the hydrogen storage material, when the doping amount of the Nb2O5 / MIL-125 is 6 wt%, the initial dehydrogenation temperature is 160-170 DEG C; the dehydrogenation amount at the temperature of 250 DEG C is 5.0 wt%-5.2 wt%; the hydrogen absorption amount at the temperature of 100 DEG C is 4.9 wt%-5.1 wt%; after 10 times of circulation, the retention rate is 95-97%; and the activation energy of the dehydrogenation reaction is reduced by 50.05 kJ / mol.

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 method for preparing porous resin-based spherical activated carbon through one-step activation and carbonization and application of the porous resin-based spherical activated carbon. Comprising the following steps: impregnating sulfonated resin in an alkaline solution, drying, carbonizing, pickling and drying to obtain the porous resin-based spherical activated carbon, the operation is simple, and the porous resin-based spherical activated carbon can be prepared in one step.

The invention relates to a magnesium-based hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage alloy materials and preparation thereof. The hydrogen storage material is an Mg-5Ni alloy with Sm powder uniformly distributed on the surface layer and an amorphous / nanocrystalline structure in the interior. The Sm powder is wrapped by the surface layer of the Mg-5Ni alloy to form composite powder of a core-shell structure; the hydrogen storage material is prepared from Mg-5Ni alloy powder and Sm powder as raw materials, and the raw materials are mixed and then subjected to dry ball milling. The hydrogen absorption and desorption kinetics of the existing magnesium-based hydrogen storage material can be effectively improved, the hydrogen desorption activation energy of the magnesium-based hydrogen storage material is reduced, and the problem that a solid additive is difficult to uniformly distribute on the surface is solved.

The invention relates to the technical field of hydrogen storage materials, in particular to a pyrochlore structure Bi2Ti2O7 doped magnesium hydride hydrogen storage material and a preparation method thereof. Comprising the following steps: firstly, adding bismuth nitrate pentahydrate into an acetone solution, and uniformly stirring; dropwise adding tetrabutyl titanate into the mixture, and continuously stirring until the tetrabutyl titanate is completely dissolved; performing ultrasonic treatment on the solution, performing hydrothermal reaction, washing, performing suction filtration to obtain sediment, and drying; then calcining for a period of time in an air atmosphere to obtain Bi2Ti2O7; and finally, grinding the MgH2 and 8 to 12 weight percent of Bi2Ti2O7 catalyst together in an inert atmosphere, so as to obtain the hydrogen storage material with the Bi2Ti2O7 doped with the magnesium hydride. The preparation process is simple, the Bi2Ti2O7 microspheres are synthesized by adopting a surfactant-free and template-free liquid phase method, the energy consumption is low, and the pollution is small; the hollow spherical catalyst can greatly enhance the ball milling effect, is beneficial to uniform distribution on an MgH2 matrix, and reduces hydrogen storage capacity recession; the Bi2Ti2O7 doped magnesium hydride hydrogen storage material synthesized by the method disclosed by the invention has the hydrogen desorption initial temperature of 187 DEG C and the hydrogen desorption amount of 6.8 wt%.

The application discloses a kind of catalysts for hydrogen storage material and its preparation method and application, belong to hydrogen storage material and its preparation technical field.The present application is to solve the problems such as high dehydrogenation temperature of existing magnesium-based solid hydrogen storage material and slow low-temperature kinetics.The present application is prepared by using nickel chloride hexahydrate, acetylacetone manganese, polyether P123, polyether P127, dopamine hydrochloride, 1,3,5-trimethylbenzene and ammonia as raw materials to obtain carbon as carrier wrapped with elemental Ni nanoparticle catalyst with a large number of edge dislocations, and is applied to Mg-based hydrogen storage material by ball milling method.The introduced dislocation has a dual role: not only directly accelerates the dissociation of H2 molecule, but also indirectly improves the activity of catalytic phase (Mg2NiH4 / Mg2Ni).The preparation process of the composite hydrogen storage material provided by the present application is simple and mature, and the raw materials are cheap and easy to obtain, only a small amount of MNC needs to be added to greatly improve the hydrogen storage performance of Mg, and it is convenient for large-scale industrial production.

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 invention relates to the technical field of alloys, in particular to a hydrogen storage high-entropy alloy coating prepared through a laser cladding process and a preparation method of the hydrogen storage high-entropy alloy coating. The alloy coating is prepared from Mg, Ti, Nb, V, Zr and M, wherein M is at least one of Cr, Fe, Mn, Co, Ni, Cu and Al. By means of the method, the high-entropy alloy coating is prepared on the surface of the base material in a laser cladding mode, the excellent hydrogen storage performance of the high-entropy alloy can be obtained, material waste can be avoided, cost is reduced, and the method has the industrialization advantage.

The invention relates to the field of high-entropy alloy materials, and discloses a high-entropy alloy material and a preparation method and application thereof. The chemical formula of the high-entropy alloy material is MgaTibNbcZrdMe, wherein M is selected from at least one of Cr, Fe, Mn, Co, Ni, Cu and Al; wherein 1 < = a < = 1.5, 0.5 < = b < = 1, 0.5 < = c < = 1, 0.5 < = d < = 1, and 1 < = e < = 1.5. The high-entropy alloy material provided by the invention is uniform in structure component, small in grain size and excellent in hydrogen storage performance.

The invention discloses a liquid hydrogen storage tank suitable for an ocean platform, and the liquid hydrogen storage tank comprises a tank body which comprises an inner spherical tank and an outer spherical tank, the inner spherical tank is concentrically arranged in the outer spherical tank, and a vacuum layer is formed between the inner spherical tank and the outer spherical tank; the multiple damping springs are arranged in the plane where the equatorial planes of the inner spherical tank and the outer spherical tank are located in the circumferential direction, and the two ends of each damping spring are connected with the outer side of the inner spherical tank and the inner side of the outer spherical tank correspondingly; the active vibration reduction device is arranged at the bottom of the outer spherical tank and comprises a supporting ring, active precession components and a base, the multiple active precession components are arranged on the base in the circumferential direction, the action end of each active precession component is connected with the supporting ring, and the bottom of the outer spherical tank is supported on the supporting ring; the active precession component is used for preventing external vibration from being transmitted to the outer spherical tank. When the liquid hydrogen storage tank stores liquid hydrogen on an ocean platform or in other ocean environments, the requirements for heat insulation performance and corrosion resistance of the stored liquid hydrogen can be met, and BOG generated by shaking of the storage tank is effectively reduced.

The utility model provides a kind of hydrogen production hydrogen storage equipment, including at least one hydrogen production module and pure water module;Every hydrogen production module includes: first support, forms a first installation space;Deionization column, is set to the bottom of first support;PEM electrolytic cell, is located in the side of deionization column;Pure water storage device includes: box, forms a second installation space;At least two liquid level sensors are respectively located in the first liquid level and second liquid level of box, and when water level reaches first liquid level or second liquid level, the trigger signal emitted by liquid level sensor located in first liquid level is opposite to the trigger signal emitted by liquid level sensor located in second liquid level, wherein first liquid level is lower than second liquid level;Water inlet hole is connected with a pure water machine to receive pure water into box;Water return hole is connected with PEM electrolytic cell.After the above technical scheme is used, it has active protection measures to prevent equipment from being damaged.

The invention provides a solid hydrogen storage material containing a transition metal alloy additive as well as a preparation method and application of the solid hydrogen storage material, and relates to the technical field of solid hydrogen storage materials. The solid hydrogen storage material comprises magnesium hydride and a transition metal alloy additive, wherein the transition metal alloy additive is a magnesium-nickel-yttrium alloy. The magnesium-nickel-yttrium alloy is added into magnesium hydride (MgH2) to serve as an additive, the hydrogen absorption / hydrogen desorption dynamic performance of MgH2 is effectively improved, the hydrogen absorption performance and the hydrogen desorption performance of MgH2 are improved, the solid hydrogen storage material has the lower hydrogen absorption and hydrogen desorption temperature, and the high final hydrogen desorption amount is obtained within a short time.

The application relates to a Nb4N5-MgH2 composite hydrogen storage material and a preparation method thereof. The composite hydrogen storage material comprises Nb4N5 and MgH2, and the Nb4N5 accounts for 3wt.%-9wt.% in the composite hydrogen storage material according to the mass percentage. The preparation method comprises the following steps: (1) preparing a Nb4N5 catalyst, dissolving NbCl5 in anhydrous ethanol, adding ammonia water to generate a precipitate, washing and drying, and then calcining in an ammonia atmosphere to obtain a Nb4N5 catalyst powder; (2) mixing the Nb4N5 catalyst with MgH2, and preparing a composite hydrogen storage material through mechanical ball milling. In the ball milling process, stainless steel balls are adopted, argon is used as a protective atmosphere, the ball-to-material ratio is (10-40):1, the ball milling time is 5-12 hours, the rotating speed is 350-500 rpm, and positive and negative intermittent ball milling is adopted. The composite material prepared by the application has excellent hydrogen storage kinetic performance. Through the uniform distribution of the Nb4N5 catalyst and the stable phase structure thereof, the hydrogen absorption and release performance and the cycle stability of the hydrogen storage material are remarkably improved. The application is suitable for the hydrogen energy field.

This invention discloses a method for preparing MOF hydrogen storage materials from waste PET and its application. The chemical formula of the MOF material is M₁. X M₂ᵧ(BDC)₂(H₂O)₂, where M₁ is Zn²⁺ or Cu²⁺, M₂ is Co²⁺, Ni²⁺ or Mg²⁺, BDC is terephthalate, 0.1≤x≤0.9, 0.1≤y≤0.9, and x+y=1. The preparation method employs a microwave-assisted solvothermal method, and the terephthalic acid (TPA) is derived from the chemical depolymerization product of waste polyethylene terephthalate. This invention is the first to specifically apply waste PET-derived MOF materials to the field of hydrogen storage. By precisely controlling the ratio of metal salt to organic ligand, reaction temperature, and time, MOF materials with high specific surface area, regular pore structure, and a large number of open metal sites are prepared in a short time. This invention also provides the application of the MOF material in hydrogen storage. The material exhibits a hydrogen storage capacity exceeding 6.5 wt% at 77 K and 100 bar, and exceeding 2.3 wt% at 298 K and 100 bar, while also demonstrating excellent cycle stability. This method offers advantages such as short reaction time, low energy consumption, and good product crystallinity, making it suitable for large-scale production.

The invention discloses a preparation method and application of hydrogen production particles with a porous structure, belongs to the technical field of hydrogen production, and improves the efficiency and stability of hydrogen storage and hydrogen release through the combination of a specific metal hydride and a structural stabilizer. Through a specific preparation method, such as ball milling and thermal annealing processes, the uniformity and structural integrity of the particles are ensured, and meanwhile, a special pore forming agent is introduced for preparation, so that the porosity of the hydrogen production particles is further remarkably improved, and the hydrogen production catalysis and hydrogen storage performance of the hydrogen production particles are improved. In addition, the particles have a wide application prospect as a catalyst carrier in a chemical reaction or in a hydrogen storage system, and especially show unique performance in improving the efficiency of a hydrogenolysis reaction of organic compounds and controlling the adsorption and release process of hydrogen in the hydrogen storage system.

The utility model discloses a filling system based on cold energy recovery, including ammonia filling unit and hydrogen storage unit, ammonia filling unit includes reheater, and the liquid ammonia feed pipe and hydrogen storage device that communicate therewith, reheater medium end intercommunication circulating water pipe and backwater pipe no.

This invention discloses a Y-Sm-Mg-Ni hydrogen storage alloy electrode material and its preparation method. The chemical formula of the electrode material is Y 1‑a‑b Sm a Mg b Ni x Al y Where a, b, x, and y are atomic ratios, with 0.05 ≤ a ≤ 0.15, 0 ≤ b ≤ 0.2, 2.85 ≤ x ≤ 3.05, and 0 ≤ y ≤ 0.2. The preparation method involves using elemental metals, Y-Ni, and Mg-Ni master alloys as raw materials, and preparing the as-cast alloy using conventional induction melting. The as-cast alloy is then encased and sealed in a quartz tube under argon pressure of -0.09 to -0.05 MPa using tantalum sheets, and subsequently annealed in a muffle furnace. This invention significantly improves the cycle stability of Y-Mg-Ni alloys through Sm doping, and the preparation method reduces the preparation cost of Y-Sm-Mg-Ni alloys by using Y-Ni and Mg-Ni master alloys as raw materials.

The present invention provides a method for improving the hydrogen storage performance of Mg-Y-Zn alloy, and the specific process is: firstly, a cast Mg-9.1Y-1.8Zn alloy is prepared by a semi-continuous casting method, and then the cast Mg-9.1Y-1.8Zn alloy is hot extruded after homogenization treatment to obtain an extruded bar, and then the extruded bar is subjected to rotary forging treatment at room temperature to obtain a rotary forging Mg-9.1Y-1.8Zn alloy. At 340 ° C, the hydrogen absorption rate and hydrogen absorption and desorption capacity of the cast and rotary forging alloys are similar, but the dehydrogenation rate of the rotary forging alloy is slightly faster than that of the cast and extruded samples; at 360 ° C, relative to the cast and extruded alloys, the rotary forging alloy exhibits excellent hydrogen absorption and desorption rate and large hydrogen absorption and desorption capacity. The present invention uses rotary forging technology to perform severe plastic deformation on the Mg-9.1Y-1.8Zn alloy, prepares a large amount of magnesium nanocrystals, the alloy grains are significantly refined, the interface increases, and hydrogen is more easily diffused and absorbed in the magnesium matrix, thereby improving the hydrogen storage performance of the alloy. The method is simple to operate and low in cost, and has broad application prospects in the mass preparation of nanoscale hydrogen storage magnesium alloys.

The invention discloses a method and a reaction device for preparing nanofiber-shaped lithium borohydride. The reaction device comprises a material tank which is arranged in the freeze-drying chamber and is provided with a valve, and a material for forming nanofiber-shaped lithium borohydride is filled in an inner cavity of a tank body of the material tank; the condenser is used for adjusting the temperature of the materials in the material tank to freeze-dry the materials and dry the materials at normal temperature; one end of the vacuum pump is connected with the freeze-drying chamber, and the vacuum pump is used for vacuumizing to form negative pressure in the freeze-drying chamber; and the inert gas supply equipment is connected with the freeze-drying chamber and is used for supplying inert gas to the freeze-drying chamber. The method comprises the following steps: transferring a solution obtained by mixing a mixed solution containing lithium borohydride and a polar organic solvent with a refrigerant into a reaction kettle, charging hydrogen into the reaction kettle, freezing to condense the solution in the reaction kettle, and sequentially carrying out vacuumizing low-temperature freeze drying and vacuumizing normal-temperature drying on the material in the reaction kettle in a water-free and oxygen-free environment to obtain the lithium borohydride / polar organic solvent. And removing the polar organic solvent and the refrigerant to obtain the nanofiber-shaped lithium borohydride.

The invention discloses a low-hydrogen-permeability polyolefin composite material and a preparation method and application thereof, and belongs to the technical field of sheet preparation, ultra-high molecular weight polyethylene and modified petroleum resin are blended and melted, and an ultra-high molecular weight polyethylene modified composite material is prepared after cooling; mixing high-density polyethylene and the ultra-high molecular weight polyethylene modified composite material, adding a nucleating agent and a compatilizer, and performing mechanical mixing to prepare polyolefin composite material particles; and pressing the polyolefin composite material particles through a press vulcanizer to prepare the low hydrogen permeation polyolefin composite material. In the preparation process of the low-hydrogen-permeation polyolefin composite material, the petroleum resin is firstly modified by the monoethanolamine, and then the ultrahigh PE is modified by the modified petroleum resin, so that the fluidity of the ultrahigh PE can be improved, the nucleation crystallization capacity of the ultrahigh PE can be improved, and the hydrogen storage effect of the polyolefin composite material can be further enhanced.