Issue 15, 2018

Metathesis of Mg2FeH6 and LiNH2 leading to hydrogen production at low temperatures

Abstract

Mg2FeH6 with a purity of up to 94.5 wt% was synthesized and its interaction with LiNH2 was investigated in this study. It was found that Li4FeH6, normally synthesized by hydriding a mixture of LiH and Fe at 700 °C and 5.5 GPa H2 pressure, can be formed via ball-milling Mg2FeH6 and LiNH2 under ambient conditions following the reaction of Mg2FeH6 + 4LiNH2 → Li4FeH6 + 2Mg(NH2)2, ΔH = −92.8 kJ mol−1. The formation of Li4FeH6 was confirmed by XRD, FTIR and Mössbauer spectroscopic characterization. Li4FeH6 further reacts with 2Mg(NH2)2 releasing ca. 4.8 wt% H2 at 225 °C and reabsorbing 3.7 wt% H2 at 200 °C and 50 bar H2 pressure. Mg(NH2)2, LiH and Fe are the hydrogenated products.

Graphical abstract: Metathesis of Mg2FeH6 and LiNH2 leading to hydrogen production at low temperatures

Article information

Article type
Paper
Submitted
31 Jan 2018
Accepted
13 Mar 2018
First published
14 Mar 2018

Phys. Chem. Chem. Phys., 2018,20, 9833-9837

Metathesis of Mg2FeH6 and LiNH2 leading to hydrogen production at low temperatures

W. Zhang, Z. Zhang, X. Jia, J. Guo, J. Wang and P. Chen, Phys. Chem. Chem. Phys., 2018, 20, 9833 DOI: 10.1039/C8CP00720A

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