Effect of La3+ on Dehydrogenation Capacity of the LiAlH4- NH4Cl System

摘要:

实验分析了LaCl3 和 La2O3对LiAlH4-NH4Cl体系放氢性能的影响。结果显示，掺杂La2O3缩短了试样的放氢起始时间，并且提高了试样的放氢速率。然而，掺杂LaCl3明显降低了试样的放氢速率。进一步的研究显示，随着LaCl3 和 La2O3加入量的增加，除了掺杂3 mol% LaCl3的试样，其它的试样在180 min内的放氢量显示出了一个逐步降低的趋势。此外，掺杂La2O3试样的最大放氢量明显高于掺杂LaCl3试样。除此以外，SEM分析结果显示，掺杂试样与未掺杂试样的微观结构都是相似的，没有显示出明显的不同

Abstract:

The effect of the catalysts LaCl3 and La2O3 on the dehydrogenation properties of the LiAlH4-NH4Cl system was analyzed. The results show that La2O3 doping shortens the starting time of hydrogen release, and improves the rate of hydrogen release. While, LaCl3 doping induces an obvious decrease of the rate of hydrogen release. Furthermore, the study shows that with the increase of the amounts of LaCl3 and La2O3, the hydrogen release amounts of the samples present a gradual decrease within 180 min except for the sample doped with 3 mol% LaCl3. However, the maximum hydrogen release amount of the sample doped with La2O3 is obviously higher than that of the sample doped with LaCl3. In addition, the analysis of the SEM images of the undoped sample and the doped samples indicates that the microstructure of all the samples seems to be similar and obvious differences are not found