Magnesium base composite hydrogen storage material and preparation method

A technology of hydrogen storage materials and ball-to-material ratio, which is applied in the field of magnesium-based composite hydrogen storage materials and its preparation, can solve the problems of poor kinetic performance of hydrogen absorption and desorption reactions, and no hydrogen storage material system has been reported, so as to facilitate purification and storage Transport, promote the hydrogen absorption and desorption reaction, the effect of low hydrogen absorption and desorption temperature

Inactive Publication Date: 2009-06-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mg studied 3 Al 12 , Mg 5 Al 6 , Mg-14Al can achieve reversible hydrogen absorption and desorption, but the kinetics of hydrogen absorption and desorption reactions are poor, and the hydrogen desorption temperature is above 300 °C
No nanocrystalline Mg 17 Al 12 Hydrogen storage material system composited with Mg

Method used

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  • Magnesium base composite hydrogen storage material and preparation method
  • Magnesium base composite hydrogen storage material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0016] The bulk metal Mg and Al are mixed according to the atomic ratio of 17:12, and Mg is prepared by intermediate frequency induction melting under vacuum conditions. 17 Al 12 Alloys are mechanically crushed to 300 mesh. Nanocrystalline Mg was obtained by ball milling for 80 hours under the protective atmosphere of argon 17 Al 12 Alloy powder. At 200℃ and 4.0MPa hydrogen pressure, the alloy can absorb hydrogen without any activation treatment, and the hydrogen absorption speed increases with the increase of temperature. Nanocrystalline Mg 17 Al 12 The hydrogen absorption curve of the alloy is as figure 1 As shown, nanocrystalline Mg 17 Al 12 The hydrogen desorption curve of the alloy is as figure 2 shown. It can be seen from the figure that the nanocrystalline Mg after ball milling 17 Al 12 The alloy has certain reversible hydrogen absorption and desorption properties, and has hydrogen absorption and desorption activity, which is beneficial to promote the hydro...

Embodiment 2

[0018] Preparation of Mg by Intermediate Frequency Induction Melting of Bulk Metal Mg and Al under Vacuum Condition 17 Al 12 Alloys are mechanically crushed to 300 mesh. Mg powder (200 mesh) was hydrogenated at 340°C under a hydrogen atmosphere (hydrogen pressure 4.0MPa) to prepare MgH 2 . Mg 17 Al 12 , MgH 2 , Ni (300 mesh) are mixed according to the weight percentage content of 3.54% Al, 5.0% Ni, and the remaining Mg. The Mg-Al-Ni composite hydrogen storage material was obtained by ball milling for 80 hours under an argon atmosphere. The hydrogen storage material can undergo a hydrogen absorption reaction at 120°C, and the hydrogen absorption amount can reach 5.6wt.% within 30 minutes at 160°C, and more than 6.0% at 180°C. Under the conditions of 260°C and 1 atmospheric pressure, the amount of hydrogen released reaches 5.0wt.% in 80 minutes.

Embodiment 3

[0020] Preparation of Mg by Intermediate Frequency Induction Melting of Bulk Metal Mg and Al under Vacuum Condition 17 Al 12 Alloys are mechanically crushed to 300 mesh. Mg powder (200 mesh) was hydrogenated at 340°C under a hydrogen atmosphere (hydrogen pressure 4.0MPa) to prepare MgH 2 . Mg 17 Al 12 , MgH 2 , Ni (300 mesh) are mixed according to the weight percentage content of 9.5% Al, 1.0% Ni, and the remaining Mg. The Mg-Al-Ni composite hydrogen storage material was obtained by ball milling for 80 hours under an argon atmosphere. The hydrogen storage material can undergo a hydrogen absorption reaction at 120°C, and the hydrogen absorption amount can reach 5.05wt.% within 30 minutes at 160°C, and 5.82% at 180°C. Under the conditions of 260°C and 1 atmospheric pressure, the amount of hydrogen released reaches 4.85wt.% in 80 minutes.

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Abstract

The invention discloses a magnesium-based composite hydrogen storage material comprising the following compositions by weight percent: 1.0-10.0% of Al, 1.0-5.0% of Ni, and the balance of Mg. A preparation method thereof comprising the following steps: at first, smelting block-shaped metal Mg and Al by a medium frequency induction to prepare Mg17Al12 alloy which is crushed to 300 meshes; hydrogenising Mg powder at 340 DEG C under a hydrogen atmosphere of 4.0MPa to prepare MgH2; then blending Mg17Al12, MgH2, Ni powder in accordance with contents by weight percent for ball-grinding for 60 to 100 hours under an atmosphere of argon. The magnesium-based composite hydrogen storage material can reversely absorb and release hydrogen at low temperature, and has high hydrogen storage capacity, excellent activation performance and superior hydrogen absorbing and releasing kinetics property. The magnesium-based composite hydrogen storage material can be used for manufacturing hydrogen source to facilitate purification and storage and transportation of hydrogen, and can also used for hydrogen storage material for fuel cells.

Description

technical field [0001] The invention relates to a lightweight low-temperature reversible hydrogen storage material, in particular to a magnesium-based composite hydrogen storage material and a preparation method thereof. Background technique [0002] With the dwindling of petroleum resources, the problem of environmental pollution is becoming more and more serious. Hydrogen energy has become an ideal secondary energy due to its advantages of abundant resources and no environmental pollution. The main technical links that constitute the hydrogen energy system include the production, supply, storage, conversion, and use of hydrogen, among which energy storage and conversion have always been the key to the effective use of energy. Storing hydrogen with metal hydride is a safe method with high specific volume storage capacity, which plays an irreplaceable role in the field of secondary energy, especially in the research of fuel cells and rechargeable batteries. . The U.S. Depa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/04
Inventor 王秀丽涂江平
Owner ZHEJIANG UNIV
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