Microscopic Study on Hydrogenation Mechanism of MgH₂ Catalyzed by Nb₂O₅

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  • Isobe Shigehito
    Graduate School of Engineering, Hokkaido University Creative Research Institution, Hokkaido University
  • Umeda Ayaka
    Graduate School of Engineering, Hokkaido University
  • Wakasugi Takenobu
    Graduate School of Engineering, Hokkaido University
  • Ma Tao
    Graduate School of Engineering, Hokkaido University
  • Yamagami Ryo
    Graduate School of Engineering, Hokkaido University
  • Hino Satoshi
    Graduate School of Engineering, Hokkaido University
  • Wang Yongming
    Graduate School of Engineering, Hokkaido University Creative Research Institution, Hokkaido University
  • Hashimoto Naoyuki
    Graduate School of Engineering, Hokkaido University
  • Ohnuki Somei
    Graduate School of Engineering, Hokkaido University

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タイトル別名
  • Microscopic Study on Hydrogenation Mechanism of MgH<sub>2</sub> Catalyzed by Nb<sub>2</sub>O<sub>5</sub>

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We propose the microstructural change model of magnesium hydride catalyzed by Nb2O5 during hydrogenation. The ball-milled composites, MgH2 and 1 mol% Nb2O5, were dehydrogenated and then rehydrogenated for varied time at room temperature under 0.1 MPa H2 atmosphere. The crystallite size of Mg and MgH2 was evaluated by powder X-ray diffraction (XRD) measurement and confirmed by transmission electron microscopy (TEM) observation. The crystallite size of generated MgH2 was smaller than that of Mg and did not change significantly with increasing time of hydrogenation. It is suggested that the number density of MgH2 crystallites increases during the hydrogenation process.

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