Catalytic effect of Ge on hydrogen desorption from MgH2

We studied the influence of Ge on hydrogen desorption from MgH sub 2 produced by mechanical alloying at room temperature under a hydrogen atmosphere. The structural and morphological properties, and the desorption kinetics of the products were examined by X-ray diffraction, differential scanning cal...

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Bibliographic Details
Published in:Journal of alloys and compounds 2002-02, Vol.334 (1-2), p.277-284
Main Authors: GENNARI, F. C, CASTRO, F. J, URRETAVIZCAYA, G, MEYER, G
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solid-gas interface
Surface physical chemistry
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Summary:We studied the influence of Ge on hydrogen desorption from MgH sub 2 produced by mechanical alloying at room temperature under a hydrogen atmosphere. The structural and morphological properties, and the desorption kinetics of the products were examined by X-ray diffraction, differential scanning calorimetry, thermal desorption spectroscopy and scanning electron microscopy. The mechanical milling of Mg-Ge mixtures under hydrogen leads to the formation of Mg sub 2 Ge and MgH sub 2 . The presence of Ge decreases the hydride decomposition temperature in a range from 50 to 150 deg C, depending on the Ge amount. On the contrary, Mg sub 2 Ge does not show any effect on hydrogen desorption.
ISSN:0925-8388
1873-4669
DOI:10.1016/s0925-8388(01)01786-8