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Citation: LUO Yong-Chun, MAO Song-Ke, YAN Ru-Xu, KONG Ling-Bin, KANG Long. Synthesis of AlH₃ by a Ball-Milling Solid-Phase Chemical Reaction and Its Hydrogen Desorption Properties[J]. Acta Physico-Chimica Sinica, ;2009, 25(02): 237-241. doi: 10.3866/PKU.WHXB20090207 shu

Synthesis of AlH₃ by a Ball-Milling Solid-Phase Chemical Reaction and Its Hydrogen Desorption Properties

1.
College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China; State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, P. R. China

Received Date: 14 August 2008
Available Online: 16 December 2008

The synthesis of AlH3with LiAlH4 and AlCl3was done by ball-milling solid phase chemical reaction under H2 atmosphere. The effects of different milling times (4-20 h) on the solid state chemical reaction and dehydrogenation properties of the milled mixture were investigated comprehensively using X-ray diffraction (XRD), thermal analysis (TG-DSC), mass spectroscopy (MS), scanning electron microscopy (SEM), and dehydrogenation measurements. The milled reaction was found to proceed as follows: 3LiAlH4+AlCl3→4AlH3+3LiCl. The reaction was almost complete after milling for 20 h and amorphous AlH3 was formed. With an increase in milling time dehydrogenation kinetics was improved resulting in hydrogen desorption at a temperature lower than 100 ℃. The maximum desorbed hydrogen capacities reached 2.6%-3.6% (w), which is close to the theoretical capacity of 4.85% (w) for the reaction. A decrease in the maximum desorbed hydrogen capacity can be attributed to the formation of LiCl·H2O and also to the decomposition of AlH3 during the milling process.
- Metal hydride; Mechanically ball-milling; AlH3; Thermal analysis; Dehydrogenation property
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沈阳化工大学材料科学与工程学院沈阳 110142

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Synthesis of AlH3 by a Ball-Milling Solid-Phase Chemical Reaction and Its Hydrogen Desorption Properties

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通讯作者: 陈斌, bchen63@163.com

Synthesis of AlH₃ by a Ball-Milling Solid-Phase Chemical Reaction and Its Hydrogen Desorption Properties