Mechanism of Novel Reaction from LiNH2 and LiH to Li2NH and H2 as a Promising Hydrogen Storage System

• DOI: 10.1021/jp049968y
• Publication Date: 2004-06-03T05:08:40Z
• Authors: Takayuki Ichikawa; Nobuko Hanada; Shigehito Isobe; Haiyan Leng; Hironobu Fujii
• Keywords: Lithium amide; Lithium hydride; Exothermic reaction; Endothermic process

The mechanism of the hydrogen desorption (HD) reaction from 1:1 mixture lithium amide (LiNH2) and hydride (LiH) to imide (Li2NH) (H2) has been proposed on basis our experimental results in this paper. model is constituted by 2 kinds elementary reactions: one that 2LiNH2 decomposes Li2NH ammonia (NH3), other emitted NH3 reacts with LiH transforms into LiNH2 H2. Since former latter reactions are, respectively, endothermic exothermic, HD corresponding occurs as soon decomposed NH3. Therefore, can be understood following processes: at first step, Li2NH/2 + NH3/2, then NH3/2 quickly LiH/2, transforming LiNH2/2 H2/2; second one, produced Li2NH/4 NH3/4, NH3/4 LiH/4 transform LiNH2/4 H2/4, such successive steps continue until completely H2, even low temperatures, catalytic effect TiCl3.