Abstract
The hydrogen desorption reaction of magnesium hydride (MgH2), MgH2 Mg + H2, is accelerated by mixing catalytic metal oxides (e.g., Nb2O5). This catalytic effect is evaluated quantitatively using the atomization energy concept. The measured hydrogen desorption rate increases monotonously with increasing y × ΔE O values of metal oxides, MxOy. Here, ΔEO, is the atomization energy for the oxide ion in M xOy. This indicates that the oxide ion interacts mainly with hydrogen atom in MgH2, in agreement with the observation of the O-H stretching mode in the FT-IR spectra during the dehydrogenation of the Nb2O5-catalyzed MgH2. This approach is also proved to be useful for the catalytic analysis of metal chlorides (e.g., TiCl3) on the decomposition reaction of NaAlH4 expressed as, NaAlH4 (1/3)Na3AlH6 + (2/3)Al + H 2.
| Original language | English |
|---|---|
| Journal | Journal of Alloys and Compounds |
| Volume | 509 |
| Issue number | SUPPL. 2 |
| DOIs | |
| Publication status | Published - 2011 Sep |
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Keywords
- Atomization energy
- Hydrogen storage
- MgH
- NaAlH
- Quantitative evaluation
ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
- Materials Chemistry
- Metals and Alloys
Cite this
Atomization energy approach to the quantitative evaluation of catalytic activities of metal oxides during dehydrogenation of MgH2 . / Hirate, H.; Morinaga, M.; Yukawa, H.; Nakai, Hiromi.
In: Journal of Alloys and Compounds, Vol. 509, No. SUPPL. 2, 09.2011.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Atomization energy approach to the quantitative evaluation of catalytic activities of metal oxides during dehydrogenation of MgH2
AU - Hirate, H.
AU - Morinaga, M.
AU - Yukawa, H.
AU - Nakai, Hiromi
PY - 2011/9
Y1 - 2011/9
N2 - The hydrogen desorption reaction of magnesium hydride (MgH2), MgH2 Mg + H2, is accelerated by mixing catalytic metal oxides (e.g., Nb2O5). This catalytic effect is evaluated quantitatively using the atomization energy concept. The measured hydrogen desorption rate increases monotonously with increasing y × ΔE O values of metal oxides, MxOy. Here, ΔEO, is the atomization energy for the oxide ion in M xOy. This indicates that the oxide ion interacts mainly with hydrogen atom in MgH2, in agreement with the observation of the O-H stretching mode in the FT-IR spectra during the dehydrogenation of the Nb2O5-catalyzed MgH2. This approach is also proved to be useful for the catalytic analysis of metal chlorides (e.g., TiCl3) on the decomposition reaction of NaAlH4 expressed as, NaAlH4 (1/3)Na3AlH6 + (2/3)Al + H 2.
AB - The hydrogen desorption reaction of magnesium hydride (MgH2), MgH2 Mg + H2, is accelerated by mixing catalytic metal oxides (e.g., Nb2O5). This catalytic effect is evaluated quantitatively using the atomization energy concept. The measured hydrogen desorption rate increases monotonously with increasing y × ΔE O values of metal oxides, MxOy. Here, ΔEO, is the atomization energy for the oxide ion in M xOy. This indicates that the oxide ion interacts mainly with hydrogen atom in MgH2, in agreement with the observation of the O-H stretching mode in the FT-IR spectra during the dehydrogenation of the Nb2O5-catalyzed MgH2. This approach is also proved to be useful for the catalytic analysis of metal chlorides (e.g., TiCl3) on the decomposition reaction of NaAlH4 expressed as, NaAlH4 (1/3)Na3AlH6 + (2/3)Al + H 2.
KW - Atomization energy
KW - Hydrogen storage
KW - MgH
KW - NaAlH
KW - Quantitative evaluation
UR - http://www.scopus.com/inward/record.url?scp=80052818683&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80052818683&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2010.10.013
DO - 10.1016/j.jallcom.2010.10.013
M3 - Article
AN - SCOPUS:80052818683
VL - 509
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - SUPPL. 2
ER -