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Magnesium hydride nano particle and preparation method and application thereof

A technology of magnesium hydride and particles, applied in the direction of alkali metal/alkaline earth metal/beryllium/magnesium hydride, etc., to achieve excellent hydrogen absorption and desorption kinetic properties, large specific surface area, and improve the effect of hydrogen absorption and desorption kinetic properties

Inactive Publication Date: 2008-02-06
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

while MgH 2 The particles are nanoscale, which has not been reported

Method used

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  • Magnesium hydride nano particle and preparation method and application thereof
  • Magnesium hydride nano particle and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, synthetic MgH 2 nanoparticles

[0018] (1) The magnesium block is placed in a hydrogen plasma arc heating furnace, and after vacuuming, under an Ar atmosphere with a total pressure of 0.8 bar, a DC arc plasma is applied to evaporate the magnesium by heating and condense to nanoparticles.

[0019] (2) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

[0020] (3) Put the prepared Mg particles into a hydrogen reaction furnace. After the system is evacuated, heat to 400°C, activate for 1 hour, pass in 40bar hydrogen for 4 hours, and cool to room temperature to obtain a particle size of nanometer. magnesium hydride particles.

Embodiment 2

[0021] Embodiment 2, synthetic MgH 2 nanoparticles

[0022] (1) Put the magnesium block in the hydrogen plasma arc heating furnace, and after vacuuming, the total pressure is 0.9bar in 40% N 2 Under a mixed atmosphere of Ar / Ar, DC arc plasma was applied to vaporize magnesium and condense it into nanoparticles.

[0023] (2) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

[0024] (3) Put the prepared Mg particles into a hydrogen reaction furnace. After the system is evacuated, heat it to 350°C, activate it for 2 hours, pass in 10 bar hydrogen gas for 12 hours, and cool it to room temperature to obtain a particle size of nanometer. magnesium hydride particles.

Embodiment 3

[0025] Embodiment 3, synthetic MgH 2 nanoparticles

[0026] (1) The magnesium block is placed in a hydrogen plasma arc heating furnace, and after vacuuming, the total pressure is 0.5bar in 40%H 2 Under a mixed atmosphere of Ar / Ar, DC arc plasma was applied to vaporize magnesium and condense it into nanoparticles.

[0027] (2) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

[0028] (3) Put the prepared Mg particles into a hydrogen reaction furnace. After the system is vacuumed, heat it to 450°C, activate it for 1 hour, pass in 40bar hydrogen gas for 2 hours, and cool it to room temperature to obtain a particle size of nanometer. magnesium hydride particles.

[0029] Fig. 1 is the product Mg and MgH of above-mentioned experiment 2 The XRD (X-ray powder diffraction) figure, it can be clearly seen that the prepared magnesium hydride has higher purity and does not ...

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Abstract

The invention discloses a magnesium hydride nanometer granular material and the preparing method and application, wherein nanometer magnesium powder is prepared through adopting arc heating method and then the magnesium powder is hydrogenated to obtain MgH2 granular product with the grain diameter being 50 nm to 600 nm. The nanometer MgH2 grain possesses high purity and outstanding kinetics property of hydrogen absorption and desorption during being used as hydrogen storage material, thereby possessing extremely important application value and extensive application potential in the hydrogen storage technical field.

Description

technical field [0001] The invention relates to the field of preparation of metal hydrides and the field of hydrogen storage technology, in particular to magnesium hydride with a particle size of nanometer level and its synthesis method and application. Background technique [0002] At present, due to the depletion of traditional energy sources such as coal, oil, and natural gas, and the increasing emphasis on environmental protection issues, the development and utilization of new energy sources has become a topic of close concern around the world. Among them, hydrogen energy is one of the most promising energy sources to be widely used in the 21st century due to its high specific mass energy content and clean and pollution-free characteristics. However, the utilization of hydrogen energy involves the key step of storage, so how to store hydrogen safely and effectively has become an urgent issue to be solved. At present, the research on hydrogen storage materials mainly inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/04
Inventor 李星国谢镭王云涛李岩刘洋曲江兰
Owner PEKING UNIV
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