Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5

Journal of Alloys and Compounds Volume 420 Issue 1-2 Page 46-49 published_at 2006-08-31
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Title ( eng )
Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5
Creator
Hanada Nobuko
Hino Satoshi
Fujii Hironobu
Source Title
Journal of Alloys and Compounds
Volume 420
Issue 1-2
Start Page 46
End Page 49
Abstract
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.
Keywords
hydrogen storage materials
high energy ballmilling
thermal analysis
NDC
Physics [ 420 ]
Language
eng
Resource Type journal article
Publisher
Elsevier B.V.
Date of Issued 2006-08-31
Rights
Copyright (c) 2005 Elsevier B.V.
Publish Type Author’s Original
Access Rights open access
Source Identifier
[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