48results about How to "Improve the kinetic performance of hydrogen absorption and desorption" patented technology

The invention discloses a porous carbon loaded nano metal oxide catalyst, a preparation method of catalyst, and a hydrogen storage material applying the catalyst. The preparation method comprises the following steps: (1) immersing an organic metal framework into a mixed solution of furfuryl alcohol and alcohol, and stirring for 12-60 hours under a sealed condition; (2) filtering a product obtained from the step (1) to obtain solid powder, and rising the temperature to 140-165 DEG C under inert atmosphere protection; (3) rising the temperature of the product obtained from the step (1) to 700-1000 DEG C under inert gas flow protection; and keeping the temperature and cooling so as to obtain the porous carbon loaded nano metal oxide catalyst. The preparation method of the catalyst provided by the invention is simple and convenient; the hydrogen storage material in which the catalyst is added has the advantages of low hydrogen discharge temperature, high hydrogen discharge velocity, good hydrogen absorption and discharge reversibility and long circulation service life.

The invention belongs to the field of hydrogen storage materials, and relates to a hydrogen storage high-entropy alloy taking a body-centered cubic structure as the principal thing and a preparation method for the hydrogen storage high-entropy alloy. A component expression formula of high-entropy alloy is as follows: (TiaZrbNbc)xMy, wherein a is greater than or equal to 5at% and smaller than or equal to 35at%, b is greater than or equal to at5% and smaller than or equal to 35at%, c is greater than or equal to 5at% and smaller than or equal to 35at%, a+b+c is equal to x, x is greater than or equal to 15at% and smaller than or equal to 100at%, M is any one or more of Hf, Fe, Co, Cr, Mn, Ni, Mo and W; and atomic percent of each M is 0-35%, and x+y is equal to 100. The preparation method for the hydrogen storage high-entropy alloy comprises the following steps of: adopting a non-consumable vacuum electric-arc furnace to smelt to prepare alloy; and adopting suction casting to sucking alloy into a water-cooling cooper mould, thereby obtaining a high-entropy alloy rod. The high-entropy alloy has high hydrogen storage capacity (3 mass% or more) and excellent hydrogen absorption and desorption dynamic performances; when hydrogen absorption and desorption amount is great, the high-entropy alloy, in comparison with a pure element, does not need to completely purify, so that cost can be saved to a great extent. The hydrogen storage high-entropy alloy taking the body-centered cubic structure as the principal thing has the characteristics of the high-entropy alloy, and has a wide application prospect in the fields of new energy resources and transportation.

The invention relates to a high-volume Mg-Zn-Ni ternary hydrogen storage alloy and a preparation method thereof. The hydrogen storage alloy is ultrafine grain powder comprising an Mg85Zn5Ni10 alloy and a catalyst TiF3, wherein the catalyst TiF3 accounts for x% of the Mg85Zn5Ni10 alloy by mass, and x is 0-8. The hydrogen storage alloy has an Mg2Ni phase and an MgZn2 phase, and is further of a nanocrystalline / non-crystalline structure. The Zn and Ni in the alloy can weaken the key energy between Mg and H, and the hydrogen storage performance of a magnesium-based hydrogen storage material is effectively improved. Through component design, control over a microstructure and addition of TiF3, the thermal stability of an alloy hydride is reduced, and the hydrogenation and dehydrogenation thermodynamic and kinetic properties of the alloy are improved. The prepared alloy powder maintains high hydrogen storage volume and fast hydrogenation and dehydrogenation kinetic properties; the dehydrogenation temperature of the hydride is remarkably reduced, and quick reversible hydrogenation and dehydrogenation can be conducted at the temperature of 280 DEG C; and the hydrogenation and dehydrogenation circulation stability is remarkably improved.

The invention discloses a nanometer magnesium base reversible hydrogen storage composite material and a preparation method thereof. The nanometer magnesium base reversible hydrogen storage composite material is prepared by 80-95 weight% of magnesium-aluminum alloy Mg17Al12 and 5-20 weight% of carbon-loaded transition metal catalyst; the carbon-loaded transition metal catalyst consists of basal material carbon and transition metal; the basal material carbon is one of graphite powder, graphite fiber, activated carbon, single-wall carbon nanotube and multi-wall carbon nanotube; and the transition metal is one of Fe, Co, Ni and Nb. The preparation method comprises the following steps: the magnesium-aluminum alloy Mg17Al12 and the carbon-loaded transition metal catalyst are uniformly mixed to perform the ball milling in the inert atmosphere to obtain the nanometer magnesium base reversible hydrogen storage composite material. The magnesium base reversible hydrogen storage composite material has such advantages as low effective hydrogen storage temperature and excellent hydrogen absorption / desorption dynamics performance, can be applied to purification, storage and transportation of hydrogen, and in particular, can serve as a hydrogen source alloy of medium / low-temperature fuel cells.

The invention relates to a preparation method of a high-performance and high-capacity Mg-Al-Y-based hydrogen storage material. The method comprises the following steps of heating and melting raw materials in a medium-frequency induction melting furnace in an inert atmosphere, casting and molding, and pulverizing and crushing the ingot into 200-300 mesh powder, mixed with the porous carbon-based catalyst Tm@C supporting transition metal and metal fluoride for high-energy ball milling to obtain a hydrogen storage material composed of the following components: Mg x Al y Y z +a%Tm@C+b%metal fluoride, where: Mg x Al y Y z is Mg‑Al‑Y hydrogen storage alloy, x, y, z are atomic ratios, where x+y+z=100, 5≤y≤15, 5≤z≤10, a and b are Mg‑Al‑Y The mass of hydrogen storage alloy powder is the mass percentage of added Tm@C and metal fluoride, a and b are 3-5. By adding porous carbon-based catalyst and metal fluoride in the present invention, the dehydrogenation kinetic performance of the prepared hydrogen storage material is greatly improved, and the dehydrogenation temperature is significantly reduced.

A magnesium-based hydrogen storage alloy containing a long-period ordered stacking structure, its chemical formula is Mg‑aX‑bY‑cLi, X represents one of V or Co, a, b, and c represent mass percentages, 3% ≤a≤8%, 17%≤b≤19%, 0.5%≤c≤1%, and the balance is Mg; the preparation method of the above-mentioned magnesium-based hydrogen storage alloy is mainly to put the alloy particles of the above-mentioned composition into a ball mill tank, and press Add 4-6mm stainless steel grinding balls at a ball-to-material ratio of 15:1-20:1, rotate at a speed of 300-400r / min, stop for 10 minutes after running for 30 minutes, and obtain powder with an average particle size of 50-90nm after ball milling for 30-50 hours , placed in a vacuum high-temperature furnace, heated to 200°C in an argon atmosphere and kept at a temperature of 24 hours, to prepare a magnesium-based hydrogen storage alloy with a long-period ordered stacking structure. The process equipment of the invention is simple and easy to control, and the cost is low, the hydrogen absorption and desorption temperature of the prepared magnesium-based hydrogen storage alloy is moderate, and the hydrogen absorption and desorption kinetic performance is good.

The invention relates to a high-capacity Mg-Sn-Ni ternary hydrogen storage intermediate alloy used for a fuel cell, and a hydrogen storage material and preparation method of the high-capacity Mg-Sn-Ni ternary hydrogen storage intermediate alloy. According to the atomic percent, the alloy comprises the chemical component of Mg<100-a-b>SnNi, wherein a is within the range of 4-6, and b is within the range of 9-11. The preparation method comprises the steps that induction heating and smelting are adopted under inert gas protection, and molten alloy is poured into a copper casting mold to obtain a cylindrical alloy ingot; and the ingot is mechanically crushed into powder and screened, the screened alloy powder and 1-5wt% of catalyst graphite are together loaded into a stainless steel ball milling tank, after vacuum pumping, high-purity argon gas is injected, and ball milling is conducted for certain time in an all-dimensional planetary high-energy ball mill to obtain alloy powder of a nanocrystalline-non-crystalline structure. According to the high-capacity Mg-Sn-Ni ternary hydrogen storage intermediate alloy used for the fuel cell, and the hydrogen storage material and preparation method of the high-capacity Mg-Sn-Ni ternary hydrogen storage intermediate alloy, bond energy between Mg and H can be wakened through Sn and Ni, and the hydrogen storage performance of the magnesium-based hydrogen storage material is effectively improved; and through component design, microstructure adjustment and control and adding of the graphite, the heat stability of hydride of the alloy is reduced, and hydrogen absorption and desorption thermodynamics and kinetics performance of the alloy is improved.

The invention relates to a magnesium vanadium composite hydrogen storage alloy and a method for manufacturing the same, belonging to the metal material field. The invention is characterized in that vanadium base sosoloid hydrogen storage alloy powder containing transition elements and magnesium powder are mixed according to a certain volume proportion to manufacture the magnesium vanadium composite hydrogen storage alloy through a spark plasma sintering method. A chemical formula of the hydrogen storage alloy is MgX(V1-RMR)1-X, wherein, V is metal vanadium; M is a mixture of transition elements Ni, Zr, Mn and Ti in equal weight; R is more than or equal to 5 percent and less than or equal to 10 percent in percentage by weight; Mg is metal magnesium powder; and X is more than or equal to 75percent and less than or equal to 85 percent in percentage by volume. Compared with the prior art, the hydrogen storage alloy has the prominent advantages that: under the condition of room temperatureand at a temperature of 300 DEG C, the hydrogen storage alloy can rapidly absorb and discharge hydrogen and has simple manufacturing process and short processing time. The alloy can be used for manufacturing a hydrogen fuel tank, a hydrogen accumulator, etc. and is particularly suitable for a hydrogen fuel cell, a hydrogen fueled engine and other systems.

The invention relates to a nano titanium trifluoride catalyzed Mg-RE-Ni-Al-Ti-Co based hydrogen storing alloy and a preparation method thereof. The hydrogen storing alloy has the following chemical composition: Mg18-x-yLaxREyNi2-z-mAlzTim+50(wt)%Co+n(wt)%TiF3, wherein x, y, z and m are atomic ratios; x is more than 1 and less than 3; y is more than 0.2 and less than 1; z is more than 0 and less than 1; m is more than 0 and less than 1; n is a mass percent of TiF3 accounting for Mg18-x-yLaxREyNi2-z-mAlzTim; n is more than 3 and less than 8; and RE comprises at least one of rare earth elements such as Ce, Nd, Y, Sm and Gd. The hydrogen storing alloy provided by the invention has high hydrogen storing capacity and excellent dynamics performance, and has high hydrogen absorption and desorption capacity at a low temperature. Moreover, the hydrogen absorption and desorption dynamics performance is greatly improved.