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通过PCT(pressure-content-temperature)设备研究催化剂Ti和LaCl3对NaAlH4和LiAlH4储氢性能的影响。NaAlH4和LiAlH4掺杂LaCl3比掺杂Ti的放氢性能有明显提高。在吸氢性能的研究中发现,在第1个吸氢循环中,掺杂3mol%LaCl3的NaAlH4试样的放氢温度明显降低。此外,LaCl3的摩尔含量对NaAlH4的放氢性能的影响是非常明显的。研究结果显示,随着LaCl3含量的增加,NaAlH4的放氢量和放氢速率显示出相同的变化趋势,即先增加后减少。其中掺杂3mol%LaCl3的NaAlH4试样的放氢量最大并且放氢动力学性能最好,其激活能为41.6kJ/mol,这个值低于所报道的掺杂Ti的NaAlH4的激活能。
The effects of Ti and LaCl3 catalysts on the hydrogen storage of NaAlH4 and LiAlH4 were investigated by PCT (pressure-content-temperature) equipment. The de-hydrogenation performance of LaCl3 doped with NaAlH4 and LiAlH4 is obviously higher than that of doped with Ti. In the study of hydrogen absorption properties, it was found that in the first hydrogen absorption cycle, the temperature of hydrogen desorption of NaAlH4 sample doped with 3mol% LaCl3 decreased obviously. In addition, the molar content of LaCl3 on the hydrogen-releasing properties of NaAlH4 is very obvious. The results show that, with the increase of LaCl3 content, the amount of hydrogen release and the rate of hydrogen evolution of NaAlH4 show the same trend, that is, increase first and then decrease. Among them, NaAlH4 doped with 3mol% LaCl3 had the highest hydrogen desorption capacity and the best hydrogen evolution kinetics. The activation energy was 41.6kJ / mol, which was lower than the reported activation energy of Ti-doped NaAlH4.