Please use this identifier to cite or link to this item: https://doi.org/10.1021/jp075748j
Title: Formation and equilibrium of ammonia in the Mg(NH2) 2-2LiH hydrogen storage system
Authors: Liu, Y. 
Hu, J. 
Wu, G. 
Xiong, Z. 
Chen, P. 
Issue Date: 31-Jan-2008
Source: Liu, Y., Hu, J., Wu, G., Xiong, Z., Chen, P. (2008-01-31). Formation and equilibrium of ammonia in the Mg(NH2) 2-2LiH hydrogen storage system. Journal of Physical Chemistry C 112 (4) : 1293-1298. ScholarBank@NUS Repository. https://doi.org/10.1021/jp075748j
Abstract: The equilibrium concentration of NH3 in the volatile products of the reaction between Mg(NH2)2 and 2LiH and the decomposition of Mg(NH2)2 and LiNH2, respectively, depends strongly on the reaction temperatures. The enthalpy changes of NH2 generation in the decomposition of LiNH2 and Mg(NH2)2 are deduced from the slopes of van't Hoff plots to be ca. 43.4 and 40.8 kJ/mol, respectively. When 600 psi hydrogen pressure was applied, the corresponding enthalpy changes increased to ca. 54.2 and 50.5 kJ/mol, respectively. For the Mg(NH2)2-2LiH system, the enthalpy change of NH2 generation in hydrogen desorption was calculated to be ca. 80.3 kJ/mol, which is substantially higher than those of the decomposition of Mg(NH2)2 and LiNH2. When high H2 pressure (higher than equilibrium pressure) was applied, the corresponding enthalpy change decreased to ca. 51.3 kJ/mol, which is close to that of the decomposition of Mg(NH2)2 under high H 2 pressure. © 2008 American Chemical Society.
Source Title: Journal of Physical Chemistry C
URI: http://scholarbank.nus.edu.sg/handle/10635/93829
ISSN: 19327447
DOI: 10.1021/jp075748j
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