An investigation on the reaction pathway between LiAlH4 and LiNH2 via gaseous ammonia
An investigation on the reaction pathway between LiAlH4 and LiNH2 via gaseous ammonia
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DOI：
10.1016/j.jallcom.2009.12.081
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发表时间：
2010-04
影响因子：
6.2
通讯作者：
Rugan Chen;Xinhua Wang;Lixin Chen;Shou-quan Li;Hongwei Ge;Y. Lei;Changpin Chen
中科院分区：
文献类型：
--
作者：
Rugan Chen;Xinhua Wang;Lixin Chen;Shou-quan Li;Hongwei Ge;Y. Lei;Changpin Chen
研究了LiAlH 4和LiNH 2通过气态氨中间体的相互作用。将摩尔比为1：1的LiAlH 4和LiNH 2粉末分别置于反应器内的两个容器中，以1°C/min的升温速率从室温加热至350°C。然后，氨与从LiAlH 4分解的Al和LiH反应，于是改变了系统的化学平衡，并且降低了初始反应温度。LiNH 2分解的氨作为中间产物。提出该体系热分解的途径为：升温速率和反应物初始摩尔比会影响m值，从而导致最终产物的变化。计算出该体系的理论放氢量为7.39-7.88wt.%总解吸容量为7.37wt.%通过热分解得到。
Interactions between LiAlH4and LiNH2through a gaseous ammonia intermediate have been investigated. LiAlH4and LiNH2powders with a molar ratio of 1:1 were separated in two containers inside a reactor and heated from room temperature to 350°C at a heating rate of 1°C/min. The results showed that LiNH2would decompose into Li2NH and NH3to certain extent even at a relatively low temperature. Ammonia then reacted with Al and LiH that decomposed from LiAlH4, whereupon the chemical equilibrium of the system was altered and the initial reaction temperature was lowered. Ammonia decomposed from LiNH2acted as an intermediate. A pathway for the thermal decomposition of the system was proposed as: The heating rate and initial molar ratio of reactants will affect the value of m, thus the final resultants vary. The theoretical hydrogen desorption capacity of the system was calculated to be in the range of 7.39–7.88wt.% and a total desorption capacity of 7.37wt.% was obtained by thermal decomposition.