Preparations and Dehydriding Properties of AlH3

doi:10.7503/cjcu20130227

Abstract

Abstract:

AlH₃ is a promising hydrogen storage material due to its high hydrogen capacity(10%, mass fraction) and relatively low dehydriding temperature(100—200℃). However, the complicate synthesis procedure restricts the fundamental investigation and practical application of AlH₃. In this paper, with LiAlH₄, LiBH₄ and AlCl₃ as the raw materials, pure α-AlH₃ and γ-AlH₃ were prepared and their dehydriding properties were studied. The experimental results show that the hydrogen desorption capacity of the prepared AlH₃ reaches 8.3%—8.5%(mass fraction), and the dehydriding temperature ranges from 120℃ to 160℃. The peak dehydriding temperature of γ-AlH₃ is 8.2℃ lower than that of α-AlH₃. The activation energies of dehydriding reaction of α-AlH₃ and γ-AlH₃ are 94.6 kJ/mol and 86.3 kJ/mol, respectively. During heating procedure, α-AlH₃ directly decomposes and releases hydrogen, while γ-AlH₃ transforms to α-AlH₃ before decomposition.

Key words: Hydrogen storage material, Hydrogen storage property, Metal hydride, Aluminum hydriele

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TrendMD:

LIU Hai-Zhen, WANG Xin-Hua, LIU Yong-An, YAN Mi. Preparations and Dehydriding Properties of AlH₃[J]. Chem. J. Chinese Universities, 2013, 34(10): 2274.

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Preparations and Dehydriding Properties of AlH₃

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