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Issue 15, 2018
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Metathesis of Mg2FeH6 and LiNH2 leading to hydrogen production at low temperatures

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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

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Publication details

The article was received on 31 Jan 2018, accepted on 13 Mar 2018 and first published on 14 Mar 2018


Article type: Paper
DOI: 10.1039/C8CP00720A
Citation: Phys. Chem. Chem. Phys., 2018,20, 9833-9837
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    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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