Catalytic Mechanism of Transition-Metal Compounds on Mg Hydrogen Sorption Reaction

The catalytic mechanisms of transition-metal compounds during the hydrogen sorption reaction of magnesium-based hydrides were investigated through relevant experiments. Catalytic activity was found to be influenced by four distinct physico-thermodynamic properties of the transition-metal compound: ...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2006-06, Vol.110 (22), p.11020-11024
Main Authors: Barkhordarian, Gagik, Klassen, Thomas, Bormann, Rüdiger
Format: Article
Language:English
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Summary:The catalytic mechanisms of transition-metal compounds during the hydrogen sorption reaction of magnesium-based hydrides were investigated through relevant experiments. Catalytic activity was found to be influenced by four distinct physico-thermodynamic properties of the transition-metal compound:  a high number of structural defects, a low stability of the compound, which however has to be high enough to avoid complete reduction of the transition metal under operating conditions, a high valence state of the transition-metal ion within the compound, and a high affinity of the transition-metal ion to hydrogen. On the basis of these results, further optimization of the selection of catalysts for improving sorption properties of magnesium-based hydrides is possible. In addition, utilization of transition-metal compounds as catalysts for other hydrogen storage materials is considered.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp0541563