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Synergistic dosing effect of TiC/FeCr nanocatalysts on the hydrogenation/dehydrogenation kinetics of nanocrystalline MgH2 powders

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  • El-Eskandarany, M. Sherif
  • Shaban, Ehab
  • Alsairafi, Ammar A.

Abstract

Nanocrystalline MgH2 powders were synthesized by reactive ball milling of elemental Mg powders milled for 200 h under a high hydrogen gas pressure of 50 bar. The end-product obtained after 200 h of milling was contaminated (∼2.3 wt.%) with the materials (Fe–12Cr stainless steel). In order to improve the hydrogenation/dehydrogenation kinetics of metal hydride powders, the as-synthesized MgH2 was doped with previously prepared TiC nanopowders, which contaminated with 2.4 wt.%, and then ball milled under hydrogen gas atmosphere for 50 h. The results related to the morphological examinations of the fabricated nanocomposite powders beyond the micro-and nano-levels showed excellent distributions of 5TiC/5Fe–12Cr dispersoids embedded into the fine host matrix of MgH2 powders. The as-fabricated nanocomposite MgH2/5TiC/5Fe–12Cr powders possessed superior hydrogenation/dehydrogenation characteristics, suggested by a low value of the activation energy (97.74 kJ/mol), and the short time required for achieving a complete absorption (6.6 min) and desorption (8.4 min) of 5.5 wt.% H2 at moderate temperature of 275 °C under a hydrogen gas pressure ranged from 0 bar to 8 bar. Under these temperature and hydrogen gas pressure, this new nanocomposite system possessed excellent absorption/desorption cyclability of 530 complete cycles, achieved in a cyclic-life-time of 515 h. The effects of ball milling time, grain sizes, as well as TiC- and Fe–12Cr concentrations on the hydrogenation/dehydrogenation processes and cyclability were investigated and discussed.

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  • El-Eskandarany, M. Sherif & Shaban, Ehab & Alsairafi, Ammar A., 2016. "Synergistic dosing effect of TiC/FeCr nanocatalysts on the hydrogenation/dehydrogenation kinetics of nanocrystalline MgH2 powders," Energy, Elsevier, vol. 104(C), pages 158-170.
    • Handle: RePEc:eee:energy:v:104:y:2016:i:c:p:158-170
    DOI: 10.1016/j.energy.2016.03.104
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    References listed on IDEAS

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    1. Zhang, Wei & Cheng, Ying & Han, Da & Han, Shumin, 2015. "The hydrogen storage properties of MgH2–Fe3S4 composites," Energy, Elsevier, vol. 93(P1), pages 625-630.
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    1. Yang, Tai & Wang, Peng & Li, Qiang & Xia, Chaoqun & Yin, Fuxing & Liang, Chunyong & Zhang, Yanghuan, 2018. "Hydrogen absorption and desorption behavior of Ni catalyzed Mg–Y–C–Ni nanocomposites," Energy, Elsevier, vol. 165(PA), pages 709-719.
    2. Xie, XiuBo & Hou, Chuanxin & Chen, Chunguang & Sun, Xueqin & Pang, Yu & Zhang, Yuping & Yu, Ronghai & Wang, Bing & Du, Wei, 2020. "First-principles studies in Mg-based hydrogen storage Materials: A review," Energy, Elsevier, vol. 211(C).
    3. Ma, Miaolian & Yang, Lingli & Ouyang, Liuzhang & Shao, Huaiyu & Zhu, Min, 2019. "Promoting hydrogen generation from the hydrolysis of Mg-Graphite composites by plasma-assisted milling," Energy, Elsevier, vol. 167(C), pages 1205-1211.

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