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›› 2013, Vol. 13 ›› Issue (4): 710-714.

• 材料工程专栏 • 上一篇    下一篇

Ca(AlH4)2的机械力化学合成及其催化放氢过程

高超 钱张信 柳东明   

  1. 安徽工业大学 材料科学与工程学院 安徽工业大学 材料科学与工程学院 安徽工业大学 材料科学与工程学院
  • 收稿日期:2013-06-14 修回日期:2013-07-10 出版日期:2013-08-20 发布日期:2013-08-20
  • 通讯作者: 柳东明

Mechano-chemical Synthesis and Catalytic Dehydrogenation Process of Ca(AlH4)2

GAO Chao QIAN Zhang-xin LIU Dong-ming   

  1. School of Materials Science and Engineering, Anhui University of Technology School of Materials Science and Engineering, Anhui University of Technology School of Materials Science and Engineering, Anhui University of Technology
  • Received:2013-06-14 Revised:2013-07-10 Online:2013-08-20 Published:2013-08-20
  • Contact: LIU Dong-ming

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摘要： 研究了Ca(AlH4)2机械力化学合成过程的反应机理及添加K2TiF6, KBF4, TiF3, NbF5对其放氢过程的影响. 结果表明，机械球磨过程中，LiAlH4与CaCl2先反应形成中间相LiCa(AlH4)3，中间相再与CaCl2反应生成Ca(AlH4)2. 添加含F?化合物可有效改善Ca(AlH4)2的放氢性能，其中，K2TiF6的催化效果最佳，可使Ca(AlH4)2前两步放氢温度分别降低39和66℃. 含F?化合物在球磨或加热过程中与Ca(AlH4)2发生化学反应，产物可催化Ca(AlH4)2放氢过程.

关键词: Ca(AlH4)2, 机械力化学合成, 放氢性能, 催化改性

Abstract: The reaction mechanism in mechano-chemical synthesis of Ca(AlH4)2 and the effects of F-containing compounds (K2TiF6, KBF4, TiF3 and NbF5) on the dehydrogenation process of Ca(AlH4)2 were investigated. It was found that the synthesis process of Ca(AlH4)2 from LiAlH4 and CaCl2 could be divided into two steps, LiAlH4 reacted with CaCl2 to form an intermediate phase LiCa(AlH4)3, and LiCa(AlH4)3 further reacted with CaCl2 to form Ca(AlH4)2. The addition of F-containing compounds could effectively improve its dehydrogenation property, and K2TiF6 exhibited the best catalytic effect, with the dehydrogenation temperatures in the first two steps of Ca(AlH4)2 reduced by 39 and 66℃, respectively. The F-containing additives could react with Ca(AlH4)2 during the ball-milling or subsequent heating process, and the generated substances improved the dehydrogenation property of Ca(AlH4)2.

Key words: Ca(AlH4)2, mechano-chemical synthesis, dehydrogenation property, catalytic modification

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