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A preparation method of in-situ growth nano-magnesium hydride loaded high specific surface material

An in-situ growth, high specific surface technology, applied in chemical instruments and methods, alkali metal/alkaline earth metal/beryllium/magnesium hydride, hydrogen, etc., can solve problems such as safety hazards, high hydrogen pressure and reaction temperature, and achieve The effect of improving thermodynamics, low operating temperature, and fast hydrogen absorption and desorption rate

Active Publication Date: 2018-12-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of nanoparticles obtained by impregnation method is 3-5nm, but high hydrogen pressure and reaction temperature are required, and there are certain safety hazards in production

Method used

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  • A preparation method of in-situ growth nano-magnesium hydride loaded high specific surface material
  • A preparation method of in-situ growth nano-magnesium hydride loaded high specific surface material
  • A preparation method of in-situ growth nano-magnesium hydride loaded high specific surface material

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Experimental program
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Effect test

Embodiment 1

[0019] A preparation method for in-situ growth of nano-magnesium hydride-loaded high specific surface material, using alkali metal hydride, magnesium halide and supporting material to synthesize in-situ under the condition of ball milling, the specific steps are as follows:

[0020] 0.4g of LiH, 2.0g of MgCl 2 and 0.07g reduced graphene are put into ball mill jar, mix uniformly; Ball mill 30 hours under the rotating speed of 450rpm under the hydrogen pressure of 0.5MPa; The mixture obtained is washed 3 times with 40mL tetrahydrofuran as solvent, centrifuged, remove solvent, Vacuum drying under 50 Pa for 14 hours to obtain the target product.

[0021] The prepared graphene carries magnesium hydride and coconut shell carbon carries the XRD patterns of magnesium hydride nanomaterials as follows figure 1 As shown in the figure, it shows that the obtained product is tetragonal MgH 2 , and no other impurities.

[0022] figure 2 The SEM and TEM images of the prepared graphene ca...

Embodiment 2

[0025] A preparation method for in-situ growth of nano-magnesium hydride-loaded high specific surface material, using alkali metal hydride, magnesium halide and supporting material to synthesize in-situ under the condition of ball milling, the specific steps are as follows:

[0026] 0.4g of LiH, 2.0g of MgCl 2 and 0.10g of coconut shell charcoal are put into a ball mill jar and mixed evenly. Ball milling at 450rpm under a hydrogen pressure of 0.5MPa for 30 hours; the resulting mixture was washed three times with 40mL tetrahydrofuran as a solvent, centrifuged to remove the solvent; vacuum-dried below 50Pa for 14 hours to obtain the target product.

[0027] The prepared graphene carries magnesium hydride and coconut shell carbon carries the XRD patterns of magnesium hydride nanomaterials as follows figure 1 As shown in the figure, it shows that the obtained product is tetragonal MgH 2 , and no other impurities.

[0028] Figure 4 Shown in the temperature-programmed dehydroge...

Embodiment 3

[0030] A preparation method for in-situ growth of nano-magnesium hydride-loaded high specific surface material, using alkali metal hydride, magnesium halide and supporting material to synthesize in-situ under the condition of ball milling, the specific steps are as follows:

[0031] 0.4g of LiH, 2.0g of MgCl 2 and 0.10g of fly ash were put into a ball mill jar, and mixed uniformly; ball milled for 40 hours under a hydrogen pressure of 0.5MPa at a speed of 500rpm; the obtained mixture was washed 3 times with 60mL tetrahydrofuran as a solvent, and centrifuged to remove the solvent; Vacuum drying under 50 Pa for 14 hours to obtain the target product.

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Abstract

The invention relates to a preparation method of an in-situ growth nano magnesium hydride loaded high specific surface material. An alkali metal hydride, magnesium halide and a support material are utilized for in situ synthesis of the material under a ball milling condition. The invention has the technical effects that: magnesium hydride is generated in situ on the support material surface through replacement reaction, the nano-composite hydrogen storage material with low operating temperature and fast hydrogen absorption and desorption rate is prepared under a mild condition, the problems of harsh preparation conditions, large product particle size and the like in previous nano magnesium hydride preparation, and the thermodynamic and dynamic performance of the magnesium hydride hydrogen storage material can be improved.

Description

technical field [0001] The present invention relates to a kind of in-situ growth nano-magnesium hydride (MgH 2 ) The preparation method of the loaded high specific surface material belongs to the technical field of hydrogen storage materials. Background technique [0002] Hydrogen energy has the advantages of abundant resources, high calorific value, and environmental protection, and is considered to be the best substitute for fossil energy in the future. However, hydrogen is a flammable and explosive gas, and realizing safe, high-quality, and bulk-density hydrogen storage is an urgent task for the development of hydrogen energy storage technology. In recent years, methods for solid-state hydrogen storage have attracted extensive attention from researchers. Magnesium-based lightweight hydrogen storage materials have the advantages of low density, large hydrogen storage capacity, abundant output, and low price. However, the disadvantages of high operating temperature and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00C01B6/04
CPCC01B3/0078C01B6/04C01P2002/72C01P2004/03C01P2004/04C01P2004/32C01P2004/51C01P2004/64C01P2004/80Y02E60/32
Inventor 王一菁袁华堂焦丽芳张秋雨黄一可臧磊
Owner NANKAI UNIV
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