中文摘要：

以NaH粉和Al粉为合成原料，分别采用2％（摩尔分数，X）CeCl3和2％CeCl3/ykH（y=0．02，0．04）为催化添加剂，在室温和3MPa氢压下，通过反应球磨（NaH／AI＋CeCl3）和（NaH／AI＋CeCl3／ykH）（y=0．02，0．04）复合物成功制备出Na．AI．H配位氢化物．吸放氢性能测试结果表明，KH的加入能有效改善Na-AI-H体系中第二步脱氢反应放氢动力学性能．（NaH／AI＋CeCl3／0．02KH）复合物170。C放氢时可在20min内完成脱氢过程，且在较低温度（100—140℃）下具有良好的可逆吸放氢性能．Kissenger方法计算表明，添加KH可降低Na-Al-H体系第二步脱氢反应的表观活化能，降低其放氢峰值温度．相结构分析表明，KH的添加使Na—Al-H体系中Na3AlH。的晶胞体积发生膨胀，进而提高体系的第二步放氢动力学性能．

英文摘要：

The Na-AI-H complex hydride was prepared by reactive ball milling （NaH/AI＋CeCI3） and （Nail/ AI＋CeCIJyKH） （y=0.02, 0.04） composites under a hydrogen pressure of 3 MPa at room temperature, using Nail and AI powder as raw materials, as well as 2% （molar fraction, x） CeCI3 and 2% CeCIJyKH （y=0.02, 0.04） as dopant, respectively. The de-/hydrogenation properties showed that the addition of KH could effectively improve the dehydrogenation kinetics of the second decomposition step for the Na-AI-H system. The （NaH/AI＋CeCIJ0.02KH） composite completed the dehydrogenation process within 20 min at 170 ℃, with good de-/hydrogenation cycling performance at relatively low temperatures （100-140 ℃）. Calculation by the Kissenger method showed that the addition of KH decreased the apparent activation energy of the second decomposition step of the Na-AI-H system, resulting in a decrease of desorption peak temperatures. Phase structure analysis showed that the enhanced second step dehydrogenation kinetics of the Na-AI-H composite system was mainly ascribed to the lattice volume expansion of Na3AIH6 that resulted from the addition of KH.