Dehydrogenation characteristics of LiAlH4 improved by in-situ formed catalysts

作者：Cai, Jiaxing; Zang, Lei; Zhao, Lipeng; Liu, Jian^*; Wang, Yijing

来源：Journal of Energy Chemistry, 2016, 25(5): 868-873.

DOI：10.1016/j.jechem.2016.06.004

• Hydrogen storage materials
• Dehydrogenation
• Complex hydrides
• LiAlH4
• FeCl2 doping
• In-situ formed catalysts

The hydrogen storage properties and catalytic mechanism of FeCl2-doped LiAlH4 were investigated in minute details. LiAlH4-2 mol% FeCl2 samples start to release hydrogen at 76 degrees C, which is 64 degrees C lower than that of as-received LiAlH4. Isothermal desorption measurements show that the 2 mol% FeCl2-doped sample releases 7.0 wt% of hydrogen within 17 min at 250 degrees C. At lower temperatures of 110 degrees C and 80 degrees C, the sample can release 4.4 wt% and 3 wt% of hydrogen, respectively. The apparent activation energy of LiAlH4 2 mol% FeCl2 samples for R2 is 105.02 kJ/mol, which is 67 kJ/mol lower than that of pure LiAlH4. The reaction between LiAlH4 and FeCl2 during ball milling was found by analyzing the X-ray diffraction results, and Fe-Al particles formed in-situ from the reaction act as the real catalyst for the dehydrogenation of LiAlH4.

• 出版日期2016-9
• 单位南开大学