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题名: The Dehydrogenation Reactions and Kinetics of 2LiBH(4)-Al Composite
作者: Zhang, Yao1;  Tian, Qifeng2, 3;  Zhang, Jian1;  Liu, Shu-Sheng1;  Sun, Li-Xian1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2009-10-22
卷: 113, 期:42, 页:18424-18430
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: The dehydrogenation reactions and kinetics of the 2LiBH(4)-Al composite were investigated by means of thermogravimetry allied with mass spectroscopy, differential scanning calorimetry, X-ray diffraction. Fourier transform infrared analysis, and isothermal dehydrogenation measurements, According to the analysis of the experimental results, the dehydrogenation of 2LiBH(4)-Al can be roughly divided into three stages that range from 553 to 648 K, 648 to 773 K, and 773 to 823 K. In the initial stage, it was observed that the decomposition of LiBH4 occurs simultaneously with the formation of AlB2. It was also found that the 3D diffusion mechanism in the form of the Jander equation dominates the kinetics of this stage. The second stage is the major dehydrogenation process. The well,fitted curves of the isothermal dehydrogenation by the Prout-Tompkins equation prove that this stage is mainly dominated by an autocatalysis reaction. The suggested reaction 2LiBH(4) + AlB2 -> 2LiH + Al + 4B + 3H(2) takes place simultaneously with the reaction 2LiBH(4) + Al -> 2LiH + AlB2 + 3H(2), AlB2 and Al serve not only as products but also as reagents for the decomposition of LiBH4. Within this stage, the activation energy is remarkably reduced to 94 +/- 5 kJ/mol from that of bulk LiBH4. At the third stage, when the temperature is above 798 K, LiAl call be formed due. to the decomposition of LiH. This stage was still characterized by the autocatalysis reaction.
关键词[WOS]: REVERSIBLE HYDROGEN STORAGE ;  LIBH4 ;  DECOMPOSITION ;  DESTABILIZATION ;  BOROHYDRIDES ;  IMIDES ;  MGH2 ;  AL
语种: 英语
WOS记录号: WOS:000270671100061
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141281
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, Lab Catalysis & New Mat Aerosp, Mat & Thermochem Grp, Dalian 116023, Peoples R China
2.Wuhan Univ Sci & Engn, Key Lab Green Chem Proc, Minist Educ, 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,Zhang, Jian,et al. The Dehydrogenation Reactions and Kinetics of 2LiBH(4)-Al Composite[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(42):18424-18430.
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