Direct synthesis and dehydrogenation properties of NaAlH4 catalyzed with ball-milled Ti–B
来源期刊：Rare Metals2017年第6期
论文作者：Li Li Zi-Chao Zhang Yi-Jing Wang Li-Fang Jiao Hua-Tang Yuan
文章页码：517 - 522
摘 要：Ball-milled Ti–B-doped sodium aluminum hydride was directly synthesized via mechanical ball-milling of a NaH/Al mixture. The mixture was completely hydrogenated to NaAlH4 after 70 h under hydrogen pressure of 1 MPa. And higher hydrogen pressure is beneficial for the conversion from NaH/Al mixture to NaAlH4. The dehydrogenation properties of the as-synthesized Ti–Bdoped sodium aluminum were systematically investigated.The result shows that ball-milled Ti–B has a remarkable catalytic effect on the enhanced dehydrogenation properties of NaAlH4. As-synthesized Ti–B-doped NaAlH4 sample releases hydrogen at the temperature of about 100 ℃. Approximately 4.15 wt% H2 is released from ballmilled Ti–B-doped NaAlH4 at 233.7 ℃. Even at 110 ℃, it also releases about 2.83 wt% hydrogen. The apparent activation energy（Ea） for the first step is estimated to be 83.97 k J·mol-1 using Arrhenius equation. Thus, utilization of ball-milled Ti–B as catalyst would substantially enhance the practical applications of NaAlH4 for hydrogen storage.
Li Li1,2，Zi-Chao Zhang1，Yi-Jing Wang2，Li-Fang Jiao2，Hua-Tang Yuan2
1. Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of University, Nankai University
摘 要：Ball-milled Ti–B-doped sodium aluminum hydride was directly synthesized via mechanical ball-milling of a NaH/Al mixture. The mixture was completely hydrogenated to NaAlH4 after 70 h under hydrogen pressure of 1 MPa. And higher hydrogen pressure is beneficial for the conversion from NaH/Al mixture to NaAlH4. The dehydrogenation properties of the as-synthesized Ti–Bdoped sodium aluminum were systematically investigated.The result shows that ball-milled Ti–B has a remarkable catalytic effect on the enhanced dehydrogenation properties of NaAlH4. As-synthesized Ti–B-doped NaAlH4 sample releases hydrogen at the temperature of about 100 ℃. Approximately 4.15 wt% H2 is released from ballmilled Ti–B-doped NaAlH4 at 233.7 ℃. Even at 110 ℃, it also releases about 2.83 wt% hydrogen. The apparent activation energy（Ea） for the first step is estimated to be 83.97 k J·mol-1 using Arrhenius equation. Thus, utilization of ball-milled Ti–B as catalyst would substantially enhance the practical applications of NaAlH4 for hydrogen storage.
关键词：
