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题名: The reactions in LiBH4-NaNH2 hydrogen storage system
作者: Zhang, Yao1;  Tian, Qifeng2, 3
关键词: Hydrogen storage ;  Stepwise reactions ;  LiBH4-NaNH2 system
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2011-08-01
DOI: 10.1016/j.ijhydene.2011.05.035
卷: 36, 期:16, 页:9733-9742
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: Stepwise reactions were observed in the ball milling and heating process of the LiBH4-NaNH2 system by means of X-ray diffraction (XRD) and Fourier transform infrared spectrometry (FT-IR). During the ball milling process, two concurrent reactions take place in the mixture: 3LiBH(4) + 4NaNH(2) -> Li3Na(NH2)(4) + 3NaBH(4) and LiBH4 + NaNH2 -> LiNH2 + NaBH4. The heating process from 50 degrees C to 400 degrees C is mainly the concurrent reactions of Li3Na(NH2)(4) + 3LiBn(4) -> 2Li(3)BN(2) + NaBH4 + 8H(2) and 2LiNH(2) + LiBH4 -> Li3BN2H8 -> Li3BN2 + 4H(2), where the intermediate phases Li3Na(NH2)(4) and LiNH2 serve as the reagents to decompose LiBH4. The merged equations for the mechanochemical and the heating reactions below 400 degrees C can be denoted as 3LiBH(4) + 2NaNH(2) -> Li3BN2 + 2NaBH(4) + 4H(2). The maximum dehydrogenation capacity in closed system below 400 degrees C is 5.1 wt.% H-2, which agrees well with the theoretical capacity (5.5 wt.% H-2) of the merged equation and thus demonstrates the suggested pathway. The subsequent step consists of the decompositions of NaBH4 and Li3Na(NH2)(4) within the temperature range of 400 degrees C-600 degrees C. The apparent activation energies of the two steps are 114.8 and 123.5 kJ/mol, respectively. They are all lower than that of our previously obtained bulk LiBH4. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: N-H SYSTEM ;  LITHIUM BOROHYDRIDE ;  LIBH4 ;  HYDRIDE ;  DESORPTION ;  TRANSITION ;  MIXTURES ;  RELEASE ;  IMIDES ;  AMIDE
语种: 英语
WOS记录号: WOS:000294374800038
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142295
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, Complex Hydride Mat Res Grp, Dalian 116023, Peoples R China
2.Wuhan Inst Technol, Minist Educ, Key Lab Green Chem Proc, Wuhan 430073, Peoples R China
3.Wuhan Inst Technol, Hubei Key Lab Novel Reactor & Green Chem Technol, Wuhan 430073, Peoples R China

Recommended Citation:
Zhang, Yao,Tian, Qifeng. The reactions in LiBH4-NaNH2 hydrogen storage system[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2011,36(16):9733-9742.
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