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    Regeneration of LiAlH4 at sub-ambient temperatures studied by multinuclear NMR spectroscopy

    254892.pdf (1.057Mb)
    Access Status
    Open access
    Authors
    Humphries, Terry
    Birkmire, D.
    McGrady, G.
    Hauback, B.
    Jensen, C.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Humphries, T. and Birkmire, D. and McGrady, G. and Hauback, B. and Jensen, C. 2017. Regeneration of LiAlH4 at sub-ambient temperatures studied by multinuclear NMR spectroscopy. Journal of Alloys and Compounds. 723: pp. 1150-1154.
    Source Title
    Journal of Alloys and Compounds
    DOI
    10.1016/j.jallcom.2017.06.300
    ISSN
    0925-8388
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/56378
    Collection
    • Curtin Research Publications
    Abstract

    Lithium aluminium hydride (LiAlH 4 ) has long been identified as a viable hydrogen storage material, due to its high attainable theoretical gravimetric hydrogen capacity of 7.9 wt%. The main impediment to its viability for technical application is its limitation for regeneration. Recently, solvent-mediated regeneration has been achieved at room temperature using dimethyl-ether, Me 2 O, although the reaction pathway has not been determined. This in situ multinuclear NMR spectroscopy study ( 27 Al and 7 Li) has confirmed that the Me 2 O-mediated, direct synthesis of LiAlH 4 occurs by a one-step process in which LiAlH 4 ·xMe 2 O is formed, and does not involve Li 3 AlH 6 or any other intermediates. Hydrogenation has been shown to occur below ambient temperatures (at 0 °C) for the first time, and the importance of solvate adducts formed during the process is demonstrated.

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