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

Ma, Tao; Isobe, Shigehito; Morita, Eri; Wang, Yongming; Hashimoto, Naoyuki; Ohnuki, Somei; Kimura, Toru; Ichikawa, Takayuki; Kojima, Yoshitsugu

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

Ma, Tao; Isobe, Shigehito; Morita, Eri et al.

International Journal of Hydrogen Energy, 2011, 36(19), 12319-12323

Permalink : https://hdl.handle.net/2115/47469

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アクセス権	open access
URI	https://hdl.handle.net/2115/47469
タイトル	Correlation between kinetics and chemical bonding state of catalyst surface in catalyzed magnesium hydride
著者	Ma, Tao ; Isobe, Shigehito ; Morita, Eri ; Wang, Yongming ; Hashimoto, Naoyuki ; Ohnuki, Somei ; Kimura, Toru ; Ichikawa, Takayuki ; Kojima, Yoshitsugu
著者名 Ma, Tao
e-Rad_Researcher 10564370 著者名 Isobe, Shigehito
著者名 Morita, Eri
著者名 Wang, Yongming
著者名 Hashimoto, Naoyuki
著者名 Ohnuki, Somei
著者名 Kimura, Toru
著者名 Ichikawa, Takayuki
著者名 Kojima, Yoshitsugu
言語	英語
キーワード	Hydrogen storage materials
	MgH2
	Oxide catalyst
	XPS
	TEM
発行日	2011-09
出版者	Elsevier
収録物名	International Journal of Hydrogen Energy
巻(号)	36(19)
ページ	12319-12323
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0360-3199
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.ijhydene.2011.07.011