Atomization energy approach to the quantitative evaluation of catalytic activities of metal oxides during dehydrogenation of MgH2

H. Hirate, M. Morinaga, H. Yukawa, H. Nakai

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4 Citations (Scopus)

Abstract

The hydrogen desorption reaction of magnesium hydride (MgH2), MgH2 Mg + H2, is accelerated by mixing catalytic metal oxides (e.g., Nb2O5). This catalytic effect is evaluated quantitatively using the atomization energy concept. The measured hydrogen desorption rate increases monotonously with increasing y × ΔE O values of metal oxides, MxOy. Here, ΔEO, is the atomization energy for the oxide ion in M xOy. This indicates that the oxide ion interacts mainly with hydrogen atom in MgH2, in agreement with the observation of the O-H stretching mode in the FT-IR spectra during the dehydrogenation of the Nb2O5-catalyzed MgH2. This approach is also proved to be useful for the catalytic analysis of metal chlorides (e.g., TiCl3) on the decomposition reaction of NaAlH4 expressed as, NaAlH4 (1/3)Na3AlH6 + (2/3)Al + H 2.

Original languageEnglish
Pages (from-to)S612-S615
JournalJournal of Alloys and Compounds
Volume509
Issue numberSUPPL. 2
DOIs
Publication statusPublished - 2011 Sep 1

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Keywords

  • Atomization energy
  • Hydrogen storage
  • MgH
  • NaAlH
  • Quantitative evaluation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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