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Thermodynamic Properties of Ammonia Production from Hydrogenation of Alkali and Alkaline Earth Metal Amides

Thermodynamic properties of alkali and alkaline earth metal amides are critical for their performance in hydrogen storage as well as catalytic ammonia synthesis. In this work, the ammonia equilibrium concentrations of LiNH2, KNH2 and Ba(NH2)2 at ca.10 bar of hydrogen pressure and different temperatu...

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Published in:Chemphyschem 2019-05, Vol.20 (10), p.1376-1381
Main Authors: Wang, Qian‐Ru, Guan, Ye‐Qin, Gao, Wen‐Bo, Guo, Jian‐Ping, Chen, Ping
Format: Article
Language:English
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Summary:Thermodynamic properties of alkali and alkaline earth metal amides are critical for their performance in hydrogen storage as well as catalytic ammonia synthesis. In this work, the ammonia equilibrium concentrations of LiNH2, KNH2 and Ba(NH2)2 at ca.10 bar of hydrogen pressure and different temperatures were measured by using a high‐pressure gas‐solid reaction system equipped with a conductivity meter. Hydrogenation of KNH2 gives the highest ammonia equilibrium concentration, followed by Ba(NH2)2 and LiNH2. Based on these data, the entropy and enthalpy changes of the reaction of ANH2+H2→AH+NH3 (A=Li, K, and Ba) were obtained from the van't Hoff equation. These thermodynamic parameters provide important information on the understanding of metal amides in catalytic ammonia synthesis reaction. Catalytic hydrogenation: The thermodynamic properties of hydrogenation of LiNH2, KNH2 and Ba(NH2)2 under 10 bar of hydrogen pressure were investigated. The thermodynamic parameters obtained may provide important information on understanding the role of metal amides in catalytic ammonia synthesis as well as hydrogen storage.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201801090