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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| File | |
| Title ( eng ) |
Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5
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| Creator |
Hanada Nobuko
Hino Satoshi
Fujii Hironobu
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| Source Title |
Journal of Alloys and Compounds
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| 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.
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| Keywords |
hydrogen storage materials
high energy ballmilling
thermal analysis
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| NDC |
Physics [ 420 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
Elsevier B.V.
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| Date of Issued | 2006-08-31 |
| Rights |
Copyright (c) 2005 Elsevier B.V.
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| 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
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