Metathesis of Mg2FeH6 and LiNH2 leading to hydrogen production at low temperatures
| Autor: | Weijin Zhang, Ping Chen, Junhu Wang, Xianchao Jia, Jianping Guo, Zhao Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Metathesis 01 natural sciences 0104 chemical sciences Mössbauer spectroscopy Physical and Theoretical Chemistry Fourier transform infrared spectroscopy 0210 nano-technology Bar (unit) Nuclear chemistry Hydrogen production |
| Zdroj: | Physical Chemistry Chemical Physics. 20:9833-9837 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | 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 Mossbauer 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. |
| Databáze: | OpenAIRE |
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