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Magnesium amide nano-particle hydrogen storage material and preparation thereof

A nanoparticle and ammonia technology, which is applied in the field of preparation of metal amide compounds, can solve problems such as Mg that cannot be prepared as single crystals, achieve excellent hydrogen absorption and desorption kinetic properties, high sample purity, and improve hydrogen absorption and desorption kinetic properties. Effect

Inactive Publication Date: 2009-12-23
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prior art cannot prepare single crystal Mg(NH 2 ) 2 particles, the resulting Mg(NH 2 ) 2 The particles are all polycrystalline polymers, and their sizes are above the micron level

Method used

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  • Magnesium amide nano-particle hydrogen storage material and preparation thereof
  • Magnesium amide nano-particle hydrogen storage material and preparation thereof
  • Magnesium amide nano-particle hydrogen storage material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1, synthetic Mg (NH 2 ) 2 nanoparticles

[0016] (1) Put the magnesium block in the plasma arc heating furnace, after vacuuming, under 65%Ar / 35%NH with a total pressure of 0.9bar 3 (volume content) atmosphere, apply DC arc plasma to heat and evaporate magnesium and combine with NH 3 The reaction produces Mg 3 N 2 nanoparticles;

[0017] (2) the prepared Mg 3 N 2 Put the nanoparticles into the ammonia reaction furnace, heat the system to 325°C after vacuuming the system, pass through 4bar ammonia gas for 12 hours, and cool to room temperature to obtain Mg(NH 2 ) 2 particles. Embodiment 2, synthetic Mg (NH 2 ) 2 nanoparticles

Embodiment 2

[0017] (2) the prepared Mg 3 N 2 Put the nanoparticles into the ammonia reaction furnace, heat the system to 325°C after vacuuming the system, pass through 4bar ammonia gas for 12 hours, and cool to room temperature to obtain Mg(NH 2 ) 2 particles. Embodiment 2, synthetic Mg (NH 2 ) 2 nanoparticles

[0018] (1) Put the magnesium block in the plasma arc heating furnace, after vacuuming, under 40%N 2 / 60%NH 3 (Volume content) Under the mixed atmosphere, apply DC arc plasma to heat and evaporate magnesium and combine with NH 3 The reaction produces Mg 3 N 2 nanoparticles;

[0019] (2) the prepared Mg 3 N 2 Put the particles into a hydrogen reaction furnace. After the system is evacuated, 4 bar of ammonia gas is introduced, heated to 350°C, reacted for 6 hours, and cooled to room temperature to obtain Mg(NH 2 ) 2 particles.

Embodiment 3

[0020] Embodiment 3, synthetic Mg (NH 2 ) 2 nanoparticles

[0021] (1) Put the magnesium block in the hydrogen plasma electric arc heating furnace, after vacuuming, under the 30%Ar / 70%NH with a total pressure of 0.5bar 3 (Volume content) Under the mixed atmosphere, apply DC arc plasma to heat and evaporate magnesium and combine with NH 3 The reaction produces Mg 3 N 2 nanoparticles;

[0022] (2) the prepared Mg 3 N 2 Put the particles into a hydrogen reactor, heat the system to 250°C after evacuating the system, pass through 4bar ammonia gas for 20 hours, and cool to room temperature to obtain Mg(NH 2 ) 2 particles.

[0023] figure 1 Mg is the product of the above experiment 3 N 2 and Mg(NH 2 ) 2 The XRD (X-ray powder diffraction) figure, can clearly see that the prepared magnesium amido has a higher purity.

[0024] Figure 2a and 2b are the above experimental products Mg 3 N 2 and Mg(NH 2 ) 2 TEM (Transmission Electron Microscopy) image of nanoparticles, ...

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Abstract

The invention discloses an aminomagnesium nano particle product which can be used as a hydrogen storage material and a preparation method thereof. The method of arc heating is used to prepare nano-magnesium nitride, and then ammoniated to obtain Mg(NH2)2 particle products with a particle size of 50-200nm. The nano-scale Mg(NH2)2 particles of the present invention have high purity and have very good kinetic properties of hydrogen absorption and desorption when used as a hydrogen storage material, so they have extremely important application value and broad application prospects in the field of hydrogen storage technology .

Description

technical field [0001] The invention relates to the field of preparation of metal amino compounds and the field of hydrogen storage technology, in particular to magnesium amides with a particle size of nanoscale and a preparation method thereof. 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 includes me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/092
Inventor 谢镭曲江兰李瑶琦李星国
Owner PEKING UNIV
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