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题名: Improved dehydrogenation of MgH2-Li3AlH6 mixture with TiF3 addition
作者: Liu, Shu-Sheng1, 2;  Sun, Li-Xian1;  Xu, Fen3;  Zhang, Jian1;  Cao, Zhong4;  Liu, Ying-Liang5
关键词: Metal hydride ;  Magnesium ;  Titanium fluoride ;  Mechanism ;  Kinetics ;  Thermodynamics
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2011-09-01
DOI: 10.1016/j.ijhydene.2011.06.060
卷: 36, 期:18, 页:11785-11793
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: MgH2-Li(3)AIH(6) mixture shows a mutual activation effect between the components. But the dehydrogenation kinetics is still slow, especially at temperature as low as 250 degrees C. Hereby, an additive (TiF3) was introduced into the mixture in the present study. The reaction mechanisms were studied by the combined analyses of X-ray diffraction (XRD), thermogravimetric analysis (TGA), as well as thermodynamic calculations. A two-step ball milling method could reduce the mechanical decomposition of Li3AlH6 effectively and was adopted. During milling, Li3AlH6 reacts with TiF3 and produces Al3Ti while MgH2 remains stable. All the species are well mixed after milling and the grain size is as small as 100 nm. During TGA test, all the reactions occur at lower temperatures compared with undoped mixture, especially the dehydrogenation of MgH2, which shows a decrease of 60 degrees C. Its activation energy is reduced by 32.0 kJ mol(-1). The first three isothermal (250 degrees C) cycles indicate that the kinetics of dehydrogenation has been greatly enhanced, showing a reversible capacity of 4.5 wt.% H-2. The time needed for the 1st dehydrogenation has been shortened to 3600 s from 8000 s for the undoped mixture. These improvements are mainly attributed to the catalytic effect of the in-situ formed Al3Ti. But there is no influence on the rehydrogenation kinetics and the enthalpy of the dehydrogenation of MgH2 is unchanged. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: REVERSIBLE HYDROGEN STORAGE ;  MG-AL ALLOYS ;  THERMODYNAMIC PROPERTIES ;  CATALYTIC ROLE ;  HYDRIDE ;  STABILITY ;  SYSTEM ;  DESTABILIZATION ;  TEMPERATURE ;  COMPOSITE
语种: 英语
WOS记录号: WOS:000294982800033
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142600
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Mat & Thermochem Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.Liaoning Normal Univ, Fac Chem & Chem Engn, Dalian 116029, Peoples R China
4.Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Changsha 410004, Hunan, Peoples R China
5.Jinan Univ, Dept Chem, Guangzhou 510632, Guangdong, Peoples R China

Recommended Citation:
Liu, Shu-Sheng,Sun, Li-Xian,Xu, Fen,et al. Improved dehydrogenation of MgH2-Li3AlH6 mixture with TiF3 addition[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2011,36(18):11785-11793.
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