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

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

    Research output: Contribution to journalArticle

    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
    JournalJournal of Alloys and Compounds
    Volume509
    Issue numberSUPPL. 2
    DOIs
    Publication statusPublished - 2011 Sep

    Fingerprint

    Atomization
    Dehydrogenation
    Oxides
    Catalyst activity
    Metals
    Hydrogen
    Desorption
    Ions
    Hydrides
    Magnesium
    Stretching
    Chlorides
    Decomposition
    Atoms
    sodium aluminum hydride

    Keywords

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

    ASJC Scopus subject areas

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

    Cite this

    Atomization energy approach to the quantitative evaluation of catalytic activities of metal oxides during dehydrogenation of MgH2 . / Hirate, H.; Morinaga, M.; Yukawa, H.; Nakai, Hiromi.

    In: Journal of Alloys and Compounds, Vol. 509, No. SUPPL. 2, 09.2011.

    Research output: Contribution to journalArticle

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    AU - Yukawa, H.

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    N2 - 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.

    AB - 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.

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