Light-metal and high-capacity composite hydrogen storage material and preparation method thereof

A hydrogen storage material and high-capacity technology, which is applied in the production of various metal hydrides and hydrogen, can solve the problems of inability to adapt to large-scale application of industrial production, reduced kinetic performance of hydrogen desorption, and lack of hydrogen storage capacity. Achieve good hydrogen desorption kinetic performance and reversible hydrogen storage performance, improve hydrogen desorption performance, and improve catalytic hydrogen storage efficiency

Inactive Publication Date: 2012-07-11
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

This system MgB 2 The generation of is the key to ensure the reversible performance of the system, but the MgB 2 A long incubation period is required for the full generation of , which leads to the reduction of hydrogen desorption kinetics
So a lot of research has been devoted to shortening the MgB 2 incubation period, thereby improving the hydrogen desorption performance of the system, most of these studies use inorganic catalysts (such as TiCl 3 、TiF 3 , NbF 5 etc.) itself does not have the ability to store hydrogen and

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0024] LiBH used 4 , Mg and Fe raw materials are commercial materials; according to the chemical formula Mg 2 FeH 6 , Weigh 2.5g of mixed powder with a molar ratio of Mg and Fe of 2:1, put it into a ball mill tank filled with 2MPa hydrogen (≥99.99%) and pre-mill it for 20h; then place the powder in an autoclave, the temperature from room temperature to 500 o C, the holding time is 30h, the initial hydrogen pressure is 12MPa; then LiBH 4 The powder and the above-mentioned hydrogenated powder were evenly mixed according to the molar ratio of 5:1, and then reacted with ball milling under 1MPa hydrogen (≥99.99%) for 2 hours to finally prepare 5LiBH 4 +Mg 2 FeH 6 Composite hydrogen storage materials.

[0025] The hydrogen storage and desorption properties of the prepared composite hydrogen storage materials were measured by "constant volume-pressure difference method". Its dehydrogenation condition is: from room temperature to 450 o C, then 450 o C insulation, 4bar initia...

Embodiment 2

[0029] LiBH used 4 , Mg and Co raw materials are commercial materials; according to the chemical formula Mg 2 CoH 5 , Weigh 2.5g of mixed powder with a molar ratio of Mg and Co of 2:1, put it into a ball mill tank filled with 2.5MPa hydrogen (≥99.99%) and pre-mill it for 30h; then place the powder in an autoclave, Temperature rises from room temperature to 500 o C, the holding time is 48h, the initial hydrogen pressure is 10MPa; then LiBH 4 The powder and the above-mentioned hydrogenated powder were evenly mixed according to the molar ratio of 4.5:1, and then reacted and ball-milled for 2 hours under 1MPa hydrogen (≥99.99%) to finally prepare 4.5LiBH 4 +Mg 2 CoH 5 Composite hydrogen storage materials.

[0030] Table 1 shows the hydrogen storage capacity of different composite systems. As shown in Table 1, although the theoretical hydrogen storage capacity of the composite system containing Fe and Co has decreased, it is still much higher than the 6.0 wt% proposed by the...

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Abstract

The invention belongs to the field of hydrogen storage and discloses a light-metal and high-capacity composite hydrogen storage material and a preparation method thereof. The light-metal and high-capacity composite hydrogen storage material consists of lithium borohydride and magnesium-based hydride in stoichiometric ratio of (4:1)-(5:1), wherein a chemical general formula of the magnesium-based hydride is Mg2MHx and M is Fe or Co. The preparation method of the light-metal and high-capacity composite hydrogen storage material comprises a high-energy ball milling method and a high-pressure hydrogenation method and is simple; no specific catalyst is needed to be doped in the obtained lithium borohydride and magnesium-based hydride composite hydrogen storage material; and the obtained lithium borohydride and magnesium-based hydride composite hydrogen storage material has a favorable hydrogen discharge performance. With favorable dispersibility and nano-grade size, the M generated in situ in the reaction process promotes a mutual chemical reaction of the lithium borohydride and the M. The invention can provide a method which can be used for better increasing the dispersibility and enhancing the mutual chemical action for in-situ modification of complex hydrides.

Description

technical field [0001] The invention belongs to the field of hydrogen storage materials, and in particular relates to a light metal high-capacity composite hydrogen storage material and a preparation method thereof. Background technique [0002] With the development of society, the contradiction between human's demand for energy and the depletion of traditional energy has become increasingly prominent. To achieve sustainable development, new energy must be developed. As a secondary energy source, hydrogen energy has the advantages of being clean, pollution-free, and high in energy conversion efficiency, but the storage of hydrogen is the bottleneck of hydrogen energy utilization, so the development of high-capacity hydrogen storage materials has become the core of the hydrogen economy. So far, liquid hydrogen, lightweight high-pressure containers and metal hydride systems in hydrogen storage technology have all been successfully operated on hydrogen-fired vehicles or electri...

Claims

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Application Information

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IPC IPC(8): C01B3/06C01B6/24
CPCY02E60/362Y02E60/36
Inventor 肖学章邓帅帅陈立新姜昆李寿权葛红卫
Owner ZHEJIANG UNIV
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