Method of rapidly carrying out hydrogenation of hydrogen storage material

一种储氢材料、快速的技术，应用在化学仪器和方法、多种金属氢化物、碱金属/碱土金属/铍/镁氢化物等方向

Inactive Publication Date: 2004-02-25
HYDRO QUEBEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even when cobalt was used as a catalyst, only 71% of magnesium hydride was formed after 10 hours of milling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Using the method of the invention, three experiments were carried out for the first magnesium hydride using 5 at % vanadium as catalyst. The three experiments used 3%, 1% and 0.3% by weight graphite as hydrogenation activator, respectively. All milling was carried out at 300° C. for 1 hour under 4 bar hydrogen.

[0056] With 3% by weight of graphite, magnesium was almost completely converted to magnesium hydride.

[0057] Using 1% by weight of graphite, the conversion of magnesium to magnesium hydride was achieved, but in a much smaller amount.

[0058] With 0.3% by weight of graphite, the magnesium powder aggregated into small balls and no hydrides were formed.

[0059] Thus, in the case of magnesium, for graphite as hydrogenation activator, the lower limit for the amount of hydrogenation activator appears to be 1% by weight.

Embodiment 2

[0068] Using the method of the invention, three experiments were carried out for the first magnesium hydride using 5 at % vanadium as catalyst.

[0069] The three tests were carried out at 300° C. under 4 bar hydrogen for 30 minutes, 1 hour and 2 hours, respectively, using 3% by weight of graphite.

[0070] The amount of hydride formed during milling was determined by X-ray diffraction. After 0.5 h, more than 50% of the magnesium was converted to magnesium hydride β-MgH 2 . After 1 hour, more than 95% of the magnesium was converted to β-MgH 2 . In both cases, we also detected traces of the metastable magnesium hydride γ-MgH 2 . After 2 hours, the results obtained were similar to those obtained after 1 hour. However, due to the β-MgH 2 The severe mechanical grinding of the phase, a large amount of metastable magnesium hydride (γ-MgH 2 ).

[0071] The amount of hydride thus obtained is reported in Table 2 below.

[0072] hydrogen pressure

Embodiment 3

[0074] Using the method of the invention, experiments were carried out to hydrogenate pure magnesium without catalyst for the first time. The test was carried out at a temperature of 300° C. under a hydrogen pressure of 4 bar using 3% by weight of graphite.

[0075] After milling for 2 hours, the hydrogenation was incomplete and there was still some unhydrogenated magnesium metal. However, in the presence of vanadium, all magnesium was hydrogenated after 1 hour.

[0076] Therefore, the use of a catalyst seems to facilitate the hydrogenation. However, even without the use of vanadium, the hydrogenation reaction in the presence of graphite, under mechanical action, at high temperature and in a hydrogen atmosphere is much faster than the reactions tested so far in the prior art.

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PUM

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Abstract

Disclosed is a method for rapidly carrying out a hydrogenation of a material capable of absorbing hydrogen. It was discovered that when a powder of a material capable of absorbing hydrogen is ground under a hydrogen pressure, not at room temperature but at a higher temperature (about 300 DEG C. in the case of magnesium) and in the presence of a hydrogenation activator such as graphite and optionally a catalyst, it is possible to transform completely the powder of this material into a hydride. Such a transformation is achieved in a period of time less than 1 hour whereas the known methods call for periods of time as much as 10 times longer. This is an unexpected result which gives rise to a considerable reduction in the cost of manufacture of an hydride, particularly MgH2.

Description

field of invention [0001] The present invention relates to a method for the rapid hydrogenation of hydrogen storage materials. Background technique [0002] The hydrogenation, more specifically the first hydrogenation, of materials known to be able to absorb hydrogen can be very difficult, since there are often native oxides present on the surface of the material which hinder the penetration of hydrogen. Therefore, one has to break this barrier to carry out the first hydrogenation of the material. Thereafter, the second hydrogenation and subsequent hydrogenations are more easily carried out. [0003] The first hydrogenation, which destroys the oxide coating the surface of the material, is called "activation". This activation is typically achieved by exposing the hydrogen storage material to high temperatures (typically several hundred degrees Celsius) and high hydrogen pressure (typically 15-50 bar). The lower the temperature and pressure required for the hydrogenation, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00C01B6/04C01B6/24
CPCY02E60/325Y02E60/327C01B3/0005C01B6/04Y02E60/32
Inventor R·舒尔兹S·博阿里查J·霍特D·古伊
Owner HYDRO QUEBEC CORP
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