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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 reduce the dehydrogenation temperature, improve the kinetic performance of hydrogen absorption and desorption, and simplify the preparation process

Active Publication Date: 2021-12-31
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Mg-Al-Y-based hydrogen storage material and preparation method thereof
  • Mg-Al-Y-based hydrogen storage material and preparation method thereof
  • Mg-Al-Y-based hydrogen storage material and preparation method thereof

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preparation example Construction

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

[0038] (1) Prepare the as-cast Mg-Al-Y alloy by vacuum induction melting method;

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

[0040] (3) Carry out mechanical grinding to the obtained alloy powder;

[0041] (4) Add the pre-prepared porous carbon-based catalyst Tm@C (Tm=Fe, Cu, Co, etc.) and fluoride (AF d =NiF 2 ,CrF 3 ,ZrF 4 etc.), continue grinding for several hours;

[0042] (5) Activate the hydrogen storage material obtained above, and then conduct a hydrogen absorption and desorption performance test.

[0043] The prepared alloy of step (1) is Mg x al y Y z , wherein, x+y+z=100, 70≤x≤90, 5≤y≤15, 5≤z≤10; the product obtained in step (3) is Mg with nanocrystalline structure 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.%AF d (AF d =NiF 2 ,CrF 3 ,ZrF 4 etc.) nanocrysta...

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. Place metal magnesium around and place rare earth in the middle high-temperature area, cover the furnace cover and evacuate to a vacuum degree below 0.05Pa, at the same time heat with a power of 0.2KW, keep it for 10 minutes, and then evacuate to a vacuum degree below 0.05Pa , and then pass in an inert gas of 0.06MPa as a protective gas, the protective gas is pure helium or a mixed gas of helium + argon, 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 magnesium metal. Then the heating power is increased to 15kW, and the temperature is controlled at about 1500-1520°C to melt all the metals. After keeping under the melting condition for 3-5 minutes, medium-f...

Embodiment 2

[0056] Taking the preparation of a 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 at a melting temperature of 1500°C and protect it under a He atmosphere. The volatilization of Mg was suppressed, the ingot was obtained and crushed, and passed through a 300-mesh sieve to obtain a powder sample. Put the powder sample into the ball mill tank, mill for 10-15 hours, the ratio of ball to material is 35:1, the speed of the ball mill is 300-350rpm, the tank needs to be filled with Ar before the ball mill treatment, to avoid excessive oxidation of the alloy powder, and the ball mill is over Then add 5wt.% Fe@C and 5wt.% CrF to it 3 , repeat the above steps, ball mill for 2±1h.

[0057] For the Mg obtained above 90 al 5 Y 5 +5wt.%5wt.%Fe@C+5wt.%CrF 3 Carry out activation treatment, the condition is 320-360 ℃, hydrogen absorption under the hydrogen pressure of 3-3.5Mpa, release hydrogen at 300-360 ℃...

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Abstract

The invention relates to a preparation method of a high-performance high-capacity Mg-Al-Y-based hydrogen storage material. The method comprises the following steps of heating, melting and casting raw materials in an inert atmosphere by using a medium-frequency induction melting furnace, pulverizing and crushing a cast ingot into 200-300-mesh powder, mixing a porous carbon-based catalyst Tm@C loaded with transition metal and metal fluoride, and conducting high-energy ball milling to obtain the hydrogen storage material, wherein the hydrogen storage material comprises the following components: MgxAlyYz+a%Tm(@)C+b% metal fluoride, MgxAlyYz is Mg-Al-Y hydrogen storage alloy, x, y and z are atomic ratios, x+y+z=100, y is larger than or equal to 5 and smaller than or equal to 15, z is larger than or equal to 5 and smaller than or equal to 10, a and b are the mass percent of Tm(@)C and metal fluoride added with the mass of Mg-Al-Y hydrogen storage alloy powder as the base number, and a and b are 3-5. By adding the porous carbon-based catalyst and the metal fluoride, the dehydrogenation dynamic performance of the prepared hydrogen storage material is greatly improved, and the dehydrogenation temperature is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, and in particular 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 source, 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 it has abundant reserves and low 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 Mg-Al hydrogen storage alloy, x is the atomic ratio, 10≤x...

Claims

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Application Information

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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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