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

Abstract This study highlights that Fe additives offer better catalytic properties than carbon, Fe−C (iron carbide/carbon composites), and Fe‐Mg (Mg 2 FeH 6 ) additives for the low‐temperature dehydrogenation of magnesium hydride. The in situ X‐ray diffraction measurements prove the formation of a Mg 2 FeH 6 phase in iron additive loaded MgH 2 . Nonetheless, differential scanning calorimetry data suggest that this Mg 2 FeH 6 phase does not have any influence on dehydrogenation properties of MgH 2 . On the other hand, the composite system Mg 2 FeH 6 /MgH 2 shows significantly improved dehydrogenation properties even in absence of further additives. It is suggested that the improved system performance of Fe loaded MgH 2 is attributed to restrictions on crystal growth of MgH 2 and the catalytic behavior of Fe nanoparticles, rather than any intrinsic catalytic properties offered by the formed mixed metal phase Mg 2 FeH 6 .

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