کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1282801 | 1497607 | 2010 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The dehydrogenation performance and reaction mechanisms of Li3AlH6 with TiF3 additive The dehydrogenation performance and reaction mechanisms of Li3AlH6 with TiF3 additive](/preview/png/1282801.png)
For Li3AlH6 prepared by mechanical milling method, the dissociation reaction enthalpy and activation energy are calculated to be 22.1 kJ mol−1 H2 and 133.7 ± 2.7 kJ mol−1, respectively. The dehydrogenation performance of Li3AlH6 is greatly enhanced by TiF3 additive, especially in the kinetic behaviors. For the Li3AlH6 + 10 mol% TiF3 sample, the starting temperature of dehydrogenation is obviously decreased by 60 °C from that of pure Li3AlH6 (190 °C), and 3.0 wt.% H2 may be released within 1000 s at 120 °C under an initial vacuum. With the amount of TiF3 increasing, the starting temperature decreases and the kinetics improves due to the decrease in the activation energy. The X-ray diffraction (XRD) together with thermogravimetric analysis (TGA) results show that there are three mechanochemical reactions involved during milling: i) Li3AlH6 + TiF3 → 3 LiF + Al + Ti + 3H2, ii) Ti + H2 → TiH2, iii) 3 Al + Ti → Al3Ti. The in-situ formed Ti species (TiH2 and Al3Ti) co-catalyze the thermal dehydrogenation of Li3AlH6.
Journal: International Journal of Hydrogen Energy - Volume 35, Issue 10, May 2010, Pages 4554–4561