Dehydrogenation characteristics of LiAlH4 improved by in-situ formed catalysts

doi:10.1016/j.jechem.2016.06.004

能源化学(英文) ›› 2016, Vol. 25 ›› Issue (5): 868-873.DOI: 10.1016/j.jechem.2016.06.004

Dehydrogenation characteristics of LiAlH₄ improved by in-situ formed catalysts

Jiaxing Cai, Lei Zang, Lipeng Zhao, Jian Liu, Yijing Wang

Institute of New Energy Material Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin Key Lab of Metal, Nankai University, Tianjin 300071, China

收稿日期:2016-03-16 修回日期:2016-06-11 出版日期:2016-09-15 发布日期:2016-09-30
通讯作者: Jian Liu
基金资助:
This work was supported by Tianjin Natural Science Foundation 09JCZDJC24800.

Dehydrogenation characteristics of LiAlH₄ improved by in-situ formed catalysts

Jiaxing Cai, Lei Zang, Lipeng Zhao, Jian Liu, Yijing Wang

Institute of New Energy Material Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin Key Lab of Metal, Nankai University, Tianjin 300071, China

Received:2016-03-16 Revised:2016-06-11 Online:2016-09-15 Published:2016-09-30
Contact: Jian Liu
Supported by:
This work was supported by Tianjin Natural Science Foundation 09JCZDJC24800.

摘要/Abstract

摘要： The hydrogen storage properties and catalytic mechanism of FeCl₂ -doped LiAlH₄ were investigated in minute details. LiAlH₄ -2 mol% FeCl₂ samples start to release hydrogen at 76 ℃, which is 64 ℃ lower than that of as-received LiAlH₄. Isothermal desorption measurements show that the 2 mol% FeCl₂ -doped sample releases 7.0 wt% of hydrogen within 17 min at 250 ℃. At lower temperatures of 110 ℃ and 80 ℃, the sample can release 4.4 wt% and 3 wt% of hydrogen, respectively. The apparent activation energy of LiAlH₄-2 mol% FeCl₂ samples for R2 is 105.02 kJ/mol, which is 67 kJ/mol lower than that of pure LiAlH₄. The reaction between LiAlH₄ and FeCl₂ during ball milling was found by analyzing the X-ray diffraction results, and Fe-Al particles formed in-situ from the reaction act as the real catalyst for the dehydrogenation of LiAlH₄.

关键词: Hydrogen storage materials, Dehydrogenation, Complex hydrides, LiAlH₄, FeCl₂ doping, In-situ formed catalysts

Abstract: The hydrogen storage properties and catalytic mechanism of FeCl₂ -doped LiAlH₄ were investigated in minute details. LiAlH₄ -2 mol% FeCl₂ samples start to release hydrogen at 76 ℃, which is 64 ℃ lower than that of as-received LiAlH₄. Isothermal desorption measurements show that the 2 mol% FeCl₂ -doped sample releases 7.0 wt% of hydrogen within 17 min at 250 ℃. At lower temperatures of 110 ℃ and 80 ℃, the sample can release 4.4 wt% and 3 wt% of hydrogen, respectively. The apparent activation energy of LiAlH₄-2 mol% FeCl₂ samples for R2 is 105.02 kJ/mol, which is 67 kJ/mol lower than that of pure LiAlH₄. The reaction between LiAlH₄ and FeCl₂ during ball milling was found by analyzing the X-ray diffraction results, and Fe-Al particles formed in-situ from the reaction act as the real catalyst for the dehydrogenation of LiAlH₄.

Key words: Hydrogen storage materials, Dehydrogenation, Complex hydrides, LiAlH₄, FeCl₂ doping, In-situ formed catalysts

Jiaxing Cai, Lei Zang, Lipeng Zhao, Jian Liu, Yijing Wang. Dehydrogenation characteristics of LiAlH₄ improved by in-situ formed catalysts[J]. 能源化学(英文), 2016, 25(5): 868-873.

Jiaxing Cai, Lei Zang, Lipeng Zhao, Jian Liu, Yijing Wang. Dehydrogenation characteristics of LiAlH₄ improved by in-situ formed catalysts[J]. Journal of Energy Chemistry, 2016, 25(5): 868-873.

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Dehydrogenation characteristics of LiAlH₄ improved by in-situ formed catalysts

Dehydrogenation characteristics of LiAlH₄ improved by in-situ formed catalysts

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