On the barriers limiting the reaction kinetics between catalysed Mg and hydrogen

The rate-limiting step of the hydriding of catalysed Mg has been ascertained through a key experiment in which the density of nuclei of the product phase was artificially modified. The various microstructures observed allow accurate identification of the reaction rate-limiting step for different hyp...

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Bibliographic Details
Published inScripta materialia Vol. 63; no. 4; pp. 456 - 459
Main Authors Montone, A., Aurora, A., Mirabile Gattia, D., Vittori Antisari, M.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2010
Subjects
Barriers
Catalysts
Constraining
Decoration
Density
Hydrogen storage
Magnesium
Microstructure
Phase transformation kinetics
Reaction kinetics
Scanning electron microscopy
Scanning electron microscopy (SEM)
Phase transformation kinetics
Hydrogen storage
Magnesium
Scanning electron microscopy (SEM)
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Summary:The rate-limiting step of the hydriding of catalysed Mg has been ascertained through a key experiment in which the density of nuclei of the product phase was artificially modified. The various microstructures observed allow accurate identification of the reaction rate-limiting step for different hypotheses. The experimental work was based on kinetics analysis coupled with scanning electron microscopy metallographic observation. It is found that the reaction barrier is located at the external surface of the powder particles, suggesting decoration with catalyst as a possible solution.
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ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.05.003