Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5

Journal of Alloys and Compounds 420 巻 1-2 号 46-49 頁 2006-08-31 発行
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タイトル ( eng )
Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5
作成者
Hanada Nobuko
Hino Satoshi
Fujii Hironobu
収録物名
Journal of Alloys and Compounds
420
1-2
開始ページ 46
終了ページ 49
抄録
Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH2 composite doped with 1 mol% Nb2O5 as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ~ 4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 sec and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH2 after rehydrogenation desorbed ~6 mass% hydrogen at 160 ºC under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ~71 kJ/molH2, indicating the product was significantly activated due to the catalytic effect of Nb2O5.
著者キーワード
hydrogen storage materials
high energy ballmilling
thermal analysis
NDC分類
物理学 [ 420 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
Elsevier B.V.
発行日 2006-08-31
権利情報
Copyright (c) 2005 Elsevier B.V.
出版タイプ Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0925-8388
[DOI] 10.1016/j.jallcom.2005.08.084
[NCID] AA10817249
[DOI] http://dx.doi.org/10.1016/j.jallcom.2005.08.084