Method for preparing magnesium based hydrogen storage material

A technology for hydrogen storage materials and magnesium-based alloys, applied in the directions of alkali metal/alkaline earth metal/beryllium/magnesium hydride, etc., can solve the problems of low purity of magnesium hydride, poor reaction kinetics, slow hydrogen absorption and desorption, etc. Achieve remarkable kinetic performance, excellent hydrogen storage performance, and simple preparation process.

Inactive Publication Date: 2007-07-25
TAIYUAN UNIV OF TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

However, magnesium and its alloys also have three disadvantages as hydrogen storage materials: (1) the rate of hydrogen absorption and desorption is slow, and the reaction kinetics are poor; (2) the hydride is relatively stable, and hydrogen release requires a higher temperature; (3) A dense oxide film is easily formed on the surface of magnesium and its alloys. These shortcomings seriously

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] In the first step, put 10.0g of pure magnesium into the reactor for the first hydrogenation, the hydrogen pressure is 6MPa, the temperature is 673K, the time is 6h, and the 10.4 sample is obtained.

[0022] In the second step, 2 g of the above-mentioned sample was ball-milled for 9 h in an argon atmosphere (1 atm).

[0023] The third step is to take 0.5g of the ball-milled sample and hydrogenate it in the P-C-T tester of the hydrogen absorption and desorption device at 613K and 4MPa hydrogen pressure for 3 hours. The first hydrogen desorption test shows that the dehydrogenation amount is 2.78wt.%.

Embodiment approach 2

[0025] In the first step, put 9.5g of pure magnesium into the reactor for the first hydrogenation, the hydrogen pressure is 5MPa, the temperature is 723K, and the time is 12h, and 9.8g of the sample is obtained.

[0026] In the second step, take 2 g of the above-mentioned sample and ball mill for 3 h in an argon atmosphere (1 atm).

[0027] The third step is to take 0.5g of the ball-milled sample and hydrogenate it in the P-C-T tester of the hydrogen absorption and desorption device at 623K and 3MPa hydrogen pressure for 2.5h. The first hydrogen desorption test shows that the dehydrogenation amount is 4.30wt.%.

Embodiment approach 3

[0029] In the first step, put 10.0g of pure magnesium into the reactor for the first hydrogenation, the hydrogen pressure is 6MPa, the temperature is 723K, the time is 6h, and 10.4g of the sample is obtained.

[0030] In the second step, take 2 g of the above sample and mill it for 12 hours in an argon atmosphere (1 atm).

[0031] The third step is to take 0.5g of the ball-milled sample and hydrogenate it in the P-C-T tester of the hydrogen absorption and desorption device at 603K and 5MPa hydrogen pressure for 2 hours. The first hydrogen desorption test shows that the hydrogen desorption amount is 2.30wt.%.

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Abstract

This invention relates to a method for preparing Mg-based hydrogen-storage material, especially a method for rapidly preparing hydride. The method comprises: (1) loading pure Mg powder into a reactor, and partially hydriding Mg at 473-723 K and 1-6 MPa hydrogen pressure for 2-12 h; (2) ball-milling the obtained MgH2 for 30 min-12 h; (3) re-loading into the reactor, performing desorption/adsorption of hydrogen to completely convert the material into MgH2 in a short time. The method has such advantages as simple process, no need for any additive, high sample purity, and low hydride cost. The prepared MgH2 has excellent hydrogen-storage performance and good mechanical properties. The hydrogen discharge amount is 2.3-4.5 wt. %. After second hydriding, the purity of MgH2 is higher than 95%. This invention provides a new route to prepare practible Mg-based hydrogen-storage material.

Description

technical field [0001] The invention relates to a preparation method of a magnesium-based hydrogen storage material, which belongs to the field of preparation of hydrogen storage materials, and specifically relates to a preparation method of a magnesium-based hydrogen storage material, in particular to a method for rapidly preparing a hydride. Background technique [0002] The hydrogenation of known hydrogen-absorbing materials may be very difficult for the first time, because there is usually a natural oxide film on the surface of the material, which seriously hinders the permeation of hydrogen gas. To do this, we have to break down the barrier to perform the first hydrogenation of the material, and subsequent hydrogenations are easy to do. The first hydrogenation, which destroys the oxide coating the surface of the hydrogen storage material, is called "activation". This activation is typically achieved by exposing hydrogen storage materials to high temperatures and high h...

Claims

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Application Information

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IPC IPC(8): C01B6/04
Inventor 李晋平董晋湘赵强王建军
Owner TAIYUAN UNIV OF TECH
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