Dehydrogenation Properties of Magnesium Hydride Loaded with Fe, Fe−C, and Fe−Mg Additives

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• 作者：Dr. D. Pukazhselvan ; Dr. Narendar Nasani ; Dr. Tao Yang ; Dr. Igor Bdikin ; Dr. Andrei V. Kovalevsky and Dr. Duncan P. Fagg
• 刊名：ChemPhysChem
• 出版年：2017
• 出版时间：February 2, 2017
• 年：2017
• 卷：18
• 期：3
• 页码：287-291
• 全文大小：1426K
• ISSN：1439-7641

文摘

This study highlights that Fe additives offer better catalytic properties than carbon, Fe−C (iron carbide/carbon composites), and Fe-Mg (Mg₂FeH₆) additives for the low-temperature dehydrogenation of magnesium hydride. The in situ X-ray diffraction measurements prove the formation of a Mg₂FeH₆ phase in iron additive loaded MgH₂. Nonetheless, differential scanning calorimetry data suggest that this Mg₂FeH₆ phase does not have any influence on dehydrogenation properties of MgH₂. On the other hand, the composite system Mg₂FeH₆/MgH₂ shows significantly improved dehydrogenation properties even in absence of further additives. It is suggested that the improved system performance of Fe loaded MgH₂ is attributed to restrictions on crystal growth of MgH₂ and the catalytic behavior of Fe nanoparticles, rather than any intrinsic catalytic properties offered by the formed mixed metal phase Mg₂FeH₆.