Hydrogen generation from hydrolysis of NH₃BH₃/MH (M = Li, Na) binary hydrides

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• 作者：Baicheng Weng ; ^{bcweng@mail.sim.ac.cn} ; Zhu Wu ; Zhilin Li ; Hui Yang
• 关键词：Ammonia borane ; Lithium hydride ; Sodium hydride ; Hydrogen production ; Amidoborane
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：March, 2012
• 卷：37
• 期：6
• 页码：5152-5160
• 文件大小：1103 K

摘要

Hydrogen release from hydrolysis of LiNH₂BH₃, NaNH₂BH₃, LiH-NH₃BH₃ and NaH-NH₃BH₃ respectively was investigated in this paper. It is shown experimentally that LiNH₂BH₃ and NaNH₂BH₃ hydrolysis can release 3 equiv. of hydrogen at 25 掳C. Hydrolysis of LiNH₂BH₃ or NaNH₂BH₃ exhibits greatly improved kinetics in comparison with neat NH₃BH₃ hydrolysis. The electronic and structural changes from NH₃BH₃ to [NH₂BH₃]^{鈭?/sup> play a crucial role in the improvements. The mechanism of LiNH₂BH₃ and NaNH₂BH₃ hydrolysis is the combination of H+ and OH鈭?/sup> ions of water with the polar ions of LiNH₂BH₃ and NaNH₂BH₃. The process of LiH-NH₃BH₃ and NaH-NH₃BH₃ hydrolysis comprises two steps: LiH or NaH first reacts with water and then the generated heat initiates thermohydrolysis of NH₃BH₃. LiH or NaH hydrolysis is prior to the reaction of LiH or NaH with NH₃BH₃. Our results show a novel strategy to promote hydrogen release kinetics of LiNH₂BH₃ and NaNH₂BH₃. Furthermore, our results also present a novel noncatalytic method for hydrogen release from NH₃BH₃ by co-hydrolyzing it with other highly exothermic hydrides.}