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A kind of mg-al-y-based hydrogen storage material and preparation method thereof

A hydrogen storage material, mg-al-y technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., to achieve the effects of simple preparation process, lower dehydrogenation temperature, and improved thermodynamic performance

Active Publication Date: 2022-07-08
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, such hydrogen storage materials are rarely reported

Method used

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  • A kind of mg-al-y-based hydrogen storage material and preparation method thereof
  • A kind of mg-al-y-based hydrogen storage material and preparation method thereof
  • A kind of mg-al-y-based hydrogen storage material and preparation method thereof

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preparation example Construction

[0037] A preparation method of a Mg-Al-Y-based hydrogen storage material, comprising the following steps:

[0038] (1) The as-cast Mg-Al-Y alloy is prepared by vacuum induction melting;

[0039] (2) crushing the obtained ingot alloy to obtain alloy powder;

[0040] (3) mechanically grinding the obtained alloy powder;

[0041] (4) After a period of mechanical grinding, the pre-prepared porous carbon-based catalysts Tm@C (Tm=Fe, Cu, Co, etc.) and fluorides (AF) were added d =NiF 2 ,CrF 3 ,ZrF 4 etc.), continue grinding for several hours;

[0042] (5) The hydrogen storage material obtained above is subjected to activation treatment, and then the hydrogen absorption and desorption performance test is carried out.

[0043] The prepared alloy of step (1) is Mg x Al y Y z , where x+y+z=100, 70≤x≤90, 5≤y≤15, 5≤z≤10; the product obtained in step (3) is nanocrystalline Mg x Al y Y z Alloy, the product of step (4) gained is Mg x Al y Y z +awt.%Tm@C(Tm=Fe,Cu,Co etc.)+bwt.%A...

Embodiment 1

[0053] Taking the preparation of 1000g sample as an example, put 830.11g Mg (99.99%), 160.66g Y (99.9%) and 48.76g Al (99.99%) into the vacuum induction melting furnace. Because the melting point of magnesium is lower than that of rare earth, it is placed at the bottom of the crucible. and the surrounding area are placed in metal magnesium, and rare earth is placed in the middle high temperature area. After the furnace cover is covered, the vacuum is evacuated to a vacuum degree below 0.05Pa. At the same time, it is heated with a power of 0.2KW, kept for 10 minutes, and then evacuated to a vacuum degree below 0.05Pa. , and then introduce an inert gas of 0.06 MPa as the protective gas, the protective gas is pure helium or a helium+argon mixed gas, and the volume ratio of the mixed gas is about 1:1. The heating power at the beginning of smelting is gradually adjusted from 0.2KW to 1kW, and the temperature is controlled at about 800-850°C to melt the metal magnesium, and then the ...

Embodiment 2

[0056] Taking the preparation of 1000g sample as an example, put 830.11g Mg (99.99%), 160.66g Y (99.9%) and 48.76Al (99.99%) into a vacuum induction melting furnace, the melting temperature is 1500 ℃, protected under He atmosphere, The volatilization of Mg was suppressed to obtain an ingot, which was crushed and passed through a 300-mesh sieve to obtain a powder sample. Put the powder sample into the ball mill tank, ball mill for 10-15h, the ball-to-material ratio is 35:1, and the ball mill rotates at 300-350rpm. Before the ball mill treatment, it is necessary to fill the tank with Ar to avoid excessive oxidation of the alloy powder, and the ball mill ends. 5wt.%Fe@C and 5wt.%CrF were then added to it 3 , Repeat the above steps, ball mill 2±1h.

[0057] For the Mg obtained above 90 Al 5 Y 5 +5wt.%5wt.%Fe@C+5wt.%CrF 3 Activation treatment is carried out, the conditions are 320-360 ° C, hydrogen absorption under the hydrogen pressure of 3-3.5 MPa, hydrogen desorption at 300...

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Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a Mg-Al-Y-based hydrogen storage material and a preparation method thereof. Background technique [0002] As a clean and efficient secondary energy, hydrogen energy has attracted much attention in recent years, but there are still many technical problems to be overcome in terms of hydrogen storage. Metal magnesium has a high hydrogen storage capacity (7.6wt.%), and itself is abundant in reserves and low in price. For example, 'a nanocrystalline magnesium-aluminum-based hydrogen storage material and its preparation method' (application number 201611120717.5, application date 2016.12. 08), the nanocrystalline magnesium-aluminum-based hydrogen storage material is a powder composed of Mg-Al hydrogen storage alloy and graphite, and its composition is: Mg 100-x Al x +y wt.%C, where: Mg 100-x Al x is Mg-Al hydrogen storage alloy, x is the atomic ratio, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06B22F9/04B22F9/20C01B3/00
CPCC22C23/06B22F9/04B22F9/20C01B3/0047B22F2009/043Y02E60/32
Inventor 魏新郭世海安静祁焱张羊换赵栋梁
Owner CENT IRON & STEEL RES INST
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