Large Amount of Hydrogen Desorption from the Mixture of Mg(NH2)2 and LiAlH4

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• 作者：Yongfeng Liu ; Jianjiang Hu ; Guotao Wu ; Zhitao Xiong ; Ping Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：December 27, 2007
• 年：2007
• 卷：111
• 期：51
• 页码：19161 - 19164
• 全文大小：107K
• 年卷期：v.111,no.51(December 27, 2007)
• ISSN：1932-7455

文摘

We report a new chemical reaction between Mg(NH₂)₂ and LiAlH₄ in a molar ratio of 1/1, which releases 8equiv of H under moderate conditions. X-ray diffraction, Fourier transform infrared spectroscopy, and NMRmeasurements revealed that an Al-N bond was established right after the occurrence of the reaction. Nitridesare the final dehydrogenation products. Thermodynamic examination reveals that the hydrogen desorptionfrom the post-ball-milled sample is a mild endothermic process, indicating it could be a potential candidatefor on-board hydrogen storage. The dehydrogenation mechanism in the mechanochemical and heating treatmentswas discussed.