借助储氢性能测试仪和Netzsch STA 449F3型同步热分析仪研究催化改性Mg2FeH6体系的放氢特性。程序升温放氢实验和等温放氢实验结果表明,添加了TiMn2、TiAl或Ti的Mg2FeH6样品和未添加催化剂的Mg2FeH6样品放氢反应动力学特征相似,反应速...借助储氢性能测试仪和Netzsch STA 449F3型同步热分析仪研究催化改性Mg2FeH6体系的放氢特性。程序升温放氢实验和等温放氢实验结果表明,添加了TiMn2、TiAl或Ti的Mg2FeH6样品和未添加催化剂的Mg2FeH6样品放氢反应动力学特征相似,反应速率有所提高,但不明显,放氢温度提前27℃左右。且催化性能TiMn2最好,纯Ti其次,TiAl较差。展开更多
Mg-based metal hydrides are promising as hydrogen storage materials for fuel ce ll application. In this work,Mg2FeH6 complex hydride phase was synthesized by controlled reactive ball milling of 2Mg-Fe （atomic ratio）...Mg-based metal hydrides are promising as hydrogen storage materials for fuel ce ll application. In this work,Mg2FeH6 complex hydride phase was synthesized by controlled reactive ball milling of 2Mg-Fe （atomic ratio） powder mixture in H2. Mg2FeH6 is confirmed to be formed via the following three stages: form ation of MgH2 via the reaction of Mg with H2,incubation stage and formation of Mg2FeH6 by reaction of fully refined MgH2 and Fe. The incubation stage is characterized by no traces of Mg or hydride crystalline phase by XRD. On the other hand,Mg is observed uniformly distributed in the milled powder by SEM-E DS. Also,almost the same amount of H2 as the first stage is detected stored i n the powders of the second stage by DSC and TGA.展开更多
文摘借助储氢性能测试仪和Netzsch STA 449F3型同步热分析仪研究催化改性Mg2FeH6体系的放氢特性。程序升温放氢实验和等温放氢实验结果表明,添加了TiMn2、TiAl或Ti的Mg2FeH6样品和未添加催化剂的Mg2FeH6样品放氢反应动力学特征相似,反应速率有所提高,但不明显,放氢温度提前27℃左右。且催化性能TiMn2最好,纯Ti其次,TiAl较差。
文摘Mg-based metal hydrides are promising as hydrogen storage materials for fuel ce ll application. In this work,Mg2FeH6 complex hydride phase was synthesized by controlled reactive ball milling of 2Mg-Fe （atomic ratio） powder mixture in H2. Mg2FeH6 is confirmed to be formed via the following three stages: form ation of MgH2 via the reaction of Mg with H2,incubation stage and formation of Mg2FeH6 by reaction of fully refined MgH2 and Fe. The incubation stage is characterized by no traces of Mg or hydride crystalline phase by XRD. On the other hand,Mg is observed uniformly distributed in the milled powder by SEM-E DS. Also,almost the same amount of H2 as the first stage is detected stored i n the powders of the second stage by DSC and TGA.
