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An investigation of the effect of Ti, Pd and Zr on the dehydriding kinetics of MgH2

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Abstract

The effect of additives Ti, Pd and Zr on the rate of hydrogen desorption from MgH2 is investigated using high-pressure differential scanning calorimetry. Van’t Hoff analysis as well as X-ray powder diffraction measurements confirm that no new intermetallic phases are formed in these systems but enhanced dehydriding kinetics are obtained in the presence of Pd and Zr. For the Mg–Zr composite, Zr precipitates are formed throughout the material on heating to 500 °C but these do not grow with further thermal cycling. The desorption rate for all the composites was found to increase with temperature as well as pressure difference between experimental and equilibrium pressures. A value of 114 ± 4 kJ mol−1 was obtained for the activation energy for dehydriding of the Mg–Ti–Pd composite.

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Authors and Affiliations

  1. Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK

    L. E. A. Berlouis & P. Honnor

  2. Chemical and Process Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK

    P. J. Hall

  3. Structures and Materials Centre-A7, QinetiQ Ltd., Cody Technology Park, Farnborough, Hants, GU14 0LX, UK

    S. Morris & S. B. Dodd

Authors
  1. L. E. A. Berlouis
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  2. P. Honnor
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  3. P. J. Hall
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  4. S. Morris
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  5. S. B. Dodd
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Correspondence to L. E. A. Berlouis.

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Berlouis, L.E.A., Honnor, P., Hall, P.J. et al. An investigation of the effect of Ti, Pd and Zr on the dehydriding kinetics of MgH2 . J Mater Sci 41, 6403–6408 (2006). https://doi.org/10.1007/s10853-006-0732-1

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  • DOI: https://doi.org/10.1007/s10853-006-0732-1

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