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采用球磨的方式在LiAlH4中分别掺入3种稀土催化剂LaCl3、CeCl3和Ce(SO4)2,研究了稀土催化剂对LiAlH4的相结构和放氢性能的影响。结果表明,在球磨过程中,掺杂Ce(SO4)2对LiAlH4的分解基本没有影响,而掺杂LaCl3和CeCl3则造成LiAlH4部分分解,产生了LiCl和Al3RE(RE=La,Ce)相。在LiAlH4放氢反应中,稀土催化剂的加入均使LiAlH4初始放氢温度降低,特别是Ce(SO4)2使第1步的放氢温度降低了约25℃。稀土催化剂有助于加快LiAlH4分解反应速率,提高LiAlH4的放氢性能。
Three kinds of rare earth catalysts LaCl3, CeCl3 and Ce (SO4) 2 were doped in LiAlH4 by ball milling. The effects of rare earth catalysts on the phase structure and hydrogen evolution performance of LiAlH4 were investigated. The results showed that Ce (SO4) 2 did not affect the decomposition of LiAlH4 during ball milling. However, the doping of LaCl3 and CeCl3 resulted in partial decomposition of LiAlH4 and the formation of LiCl and Al3RE (RE = La, Ce) phases. In the LiAlH4 hydrogenation reaction, the initial hydrogen evolution temperature of LiAlH4 decreases with the addition of the rare earth catalyst. In particular, Ce (SO4) 2 decreases the hydrogen evolution temperature of the first step by about 25 ℃. Rare-earth catalysts help to accelerate the decomposition rate of LiAlH4 and increase the hydrogen desorption capacity of LiAlH4.