通过PCT设备和XRD对掺杂Ti和Fe的LiAlH4试样进行了研究.结果表明:掺杂Ti和Fe都明显地降低了LiAlH4的放氢温度、放氢量和放氢速率,其中掺杂5mol%Fe试样的放氢温度降低最低,并且放氢量明显地高于掺杂Ti试样的放氢量;和掺杂5 mol% Ti的试样相比,掺杂5 mol%Fe的试样在第一分解阶段的分解速率明显低于前者;对于经过250 ℃热分解后的掺杂5 mol% Fe和1、3、5 mol%Ti的试样的XRD分析结果显示,掺杂催化剂并没有引起晶体结构的变化,也没有发现Ti和Fe相或含Ti和Fe的第二相的存在
LiAlH4 doped with Ti and Fe additives have been studied by PCT experiment and X-ray diffraction. Doping with Ti and Fe significantly decreased the amount, the temperature and the rate of hydrogen release. Doping with Fe induced the largest decrease in the temperature, however, the amount of hydrogen release was significantly higher than that of the samples doped with Ti. Compared to the sample doped with 5 mol% Ti, the sample doped with 5 mol% Fe presented a lower dehydrogen rate in the first step. The result obtained by XRD spectra for LiAlH4 doped with 5mol% Fe and LiAlH4 doped with 1, 3 and 5 mol% Ti heated at 250 ℃ showed that doping additives did not cause any structure change. Significantly, no Ti and Fe or the secondary Ti and Fe-containing phases were found.
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