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Correlation between kinetics and chemical bonding state of catalyst surface in catalyzed magnesium hydride

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Title: Correlation between kinetics and chemical bonding state of catalyst surface in catalyzed magnesium hydride
Authors: Ma, Tao Browse this author
Isobe, Shigehito Browse this author →KAKEN DB
Morita, Eri Browse this author
Wang, Yongming Browse this author
Hashimoto, Naoyuki Browse this author
Ohnuki, Somei Browse this author
Kimura, Toru Browse this author
Ichikawa, Takayuki Browse this author
Kojima, Yoshitsugu Browse this author
Keywords: Hydrogen storage materials
MgH2
Oxide catalyst
XPS
TEM
Issue Date: Sep-2011
Publisher: Elsevier
Journal Title: International Journal of Hydrogen Energy
Volume: 36
Issue: 19
Start Page: 12319
End Page: 12323
Publisher DOI: 10.1016/j.ijhydene.2011.07.011
Abstract: We reported on the hydrogen desorption properties, microstructure, kinetics, and chemical bonding state of catalyst surface for composites of MgH2 and 1 mol% Nb2O5 ball-milled for 0.02 h, 0.2 h, 2 h, 20 h under 1 MPa H2 atmosphere, as well as hand-mixed (HM) one. Hydrogen desorption properties were significantly improved by ball-milling with Nb2O5. Then, we estimated by Kissinger Method the activation energy (Ea) of hydrogen desorption reaction that decreased with the increase of ball-milling time. Especially, Ea of the sample ball-milled for 0.2 h was drastically decreased, compared with that of the sample ball-milled for 0.02 h. TEM observations revealed that the distribution of Nb2O5 in MgH2 was gradually improved during ball-milling. On the other hand, we confirmed by XPS that in the sample ball-milled for 0.2 h, Nb_[2]O_[5-x] phase(s) existed at least on the surface. It can be suggested that these deoxidized Nb_[2]O_[5-x] phases eventually decrease Ea as substantial catalyst rather than Nb2O5 itself.
Type: article (author version)
URI: http://hdl.handle.net/2115/47469
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 礒部 繁人

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