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Light-metal composite hydrogen storage material and preparation method thereof

A hydrogen storage material and metal composite technology, which is applied in the production of various metal hydrides and hydrogen, can solve the problems of harsh reaction conditions, difficult hydrogen absorption and desorption activation of materials, etc., and achieves simple process, reduced thermal stability, high Effect of hydrogen storage capacity characteristics

Inactive Publication Date: 2012-11-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrogen storage materials prepared by the above methods have disadvantages such as difficult hydrogen absorption and desorption activation, harsh reaction conditions, etc.

Method used

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  • Light-metal composite hydrogen storage material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Light metal composite hydrogen storage material, its chemical formula is Li 1-x Na x CaAlH 6 For metal hydride, take x=0.2; choose catalyst as 2 mol% TiF 3 , which constitutes Li 0.8 Na 0.2 CaAlH 6 + 2 mol% TiF 3 Metal coordination hydride composite hydrogen storage materials.

[0019] The preparation method of the above-mentioned light metal composite hydrogen storage material is as follows:

[0020] First, with LiH (purity 95%), NaH (purity 95%) and Al (purity 99%) as raw materials, under the protection of inert gas, according to LiH : NaH : Al =2.8 : 0.2 : 1 (molar ratio ) to mix evenly, then put the mixed powder in the ball mill tank of the ball mill and seal and vacuum the ball mill tank; then use a syringe to inject 20ml of tetrahydrofuran into the ball mill tank, fill it with 2MPa pressure hydrogen, and then ball mill on the ball mill for 12h. (the ball-to-material ratio in the ball milling process is 40:1, and the ball mill speed is 480 rpm), Li 2.8 Na...

Embodiment 2

[0025] Light metal composite hydrogen storage material, its chemical formula is Li 1-x Na x CaAlH 6 For metal hydrides, take x=0.5; select the catalyst as 5 mol% NbF 5 , which constitutes Li 0.5 Na 0.5 CaAlH 6 + 5 mol% NbF 5 Metal coordination hydride composite hydrogen storage materials.

[0026] The preparation method of the above-mentioned light metal composite hydrogen storage material is as follows:

[0027] First, with LiH (purity 95%), NaH (purity 95%) and Al (purity 99%) as raw materials, under the protection of inert gas, according to LiH : NaH : Al =2.5 : 0.5 : 1 (molar ratio ) uniformly mixed, the mixed powder is placed in a ball mill tank and the addition amount and method of injecting tetrahydrofuran are the same as in Example 1, and then filled with 5MPa pressure of hydrogen and ball milled on the ball mill for 20h (the ball-to-material ratio in the ball mill process is 20:1, the ball mill at 300 rpm), Li 2.5 Na 0.5 H 6 intermediate hydride;

[0028]...

Embodiment 3

[0032] Light metal composite hydrogen storage material, its chemical formula is Li 1-x Na x CaAlH 6 For metal hydrides, take x=1; select the catalyst as 1 mol% FeF 3 , which constitutes NaCaAlH 6 + 1 mol% FeF 3 Metal coordination hydride composite hydrogen storage materials.

[0033] The preparation method of the above-mentioned light metal composite hydrogen storage material is as follows:

[0034] First, with LiH (purity 95%), NaH (purity 95%) and Al (purity 99%) as raw materials, under the protection of inert gas, according to LiH : NaH : Al =2 : 1 : 1 (molar ratio ) uniformly mixed, the mixed powder is placed in a ball mill tank and the addition amount and method of injecting ether are the same as in Example 1, and then ball milled on a ball mill for 10 hours after filling with hydrogen at a pressure of 1MPa (the ball-to-material ratio in the ball mill process is 30:1, The speed of the ball mill is 450 rpm), Li 2 NaAlH 6 intermediate hydride;

[0035] Second, in ...

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Abstract

The invention discloses a light-metal composite hydrogen storage material and a preparation method thereof, relating to the technical field of hydrogen storage materials. The light-metal composite hydrogen storage material comprises Li1-xNaxCaAlH6 (x is not less than 0 and not more than 1) metal hydride and a fluoride catalyst. The preparation method of the composite hydrogen storage material comprises the following steps of: with LiH, NaH and Al as raw materials, preparing Li1-xNaxCaAlH6 intermediate hydride in an organic solvent by adopting a reaction ball-milling method; carrying out high-energy ball-milling on the Li1-xNaxCaAlH6 and CaCl2 under an argon atmosphere to prepare Li1-xNaxCaAlH6 metal hydride; and directly doping the fluoride catalyst to the Li1-xNaxCaAlH6 metal hydride in the ball-milling process carried out under a hydrogen atmosphere to prepare the composite hydrogen storage material. The metal composite hydrogen storage material provided by the invention is high in hydrogen storage capacity and rapid in hydrogen release characteristic, and can be synthesized at room temperature with high yield. The preparation method of the light-metal composite hydrogen storage material is simple to operate, safe, reliable and beneficial to scale production.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials, in particular to a method for preparing a light metal composite hydrogen storage material. Background technique [0002] The gradual depletion of fossil energy and the serious environmental pollution caused by its use have attracted more and more attention to hydrogen energy. The field has developed rapidly, but the lack of safe, reliable and efficient hydrogen storage key technologies is still a bottleneck restricting the large-scale application of hydrogen energy (M.G. Schultz, T. Diehl, G.P. Brasseur, W. Zittel. Science, 2003, 302(5645 ): 624–627.). Among the existing hydrogen storage technologies, the solid-state hydrogen storage technology, which stores hydrogen in materials through chemical reaction or physical adsorption, has the advantages of high volume hydrogen storage density and good safety, and is a promising hydrogen storage method. Therefore, the research and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/02C01B6/24
Inventor 肖学章陈立新李露姜昆李寿权葛红卫
Owner ZHEJIANG UNIV
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