title: 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 (Mg2FeH6) additives for the low-temperature dehydrogenation of magnesium hydride. The in situ X-ray diffraction measurements prove the formation of a Mg2FeH6phase in iron additive loaded MgH2. Nonetheless, differential scanning calorimetry data suggest that this Mg2FeH6phase does not have any influence on dehydrogenation properties of MgH2. On the other hand, the composite system Mg2FeH6/MgH2shows significantly improved dehydrogenation properties even in absence of further additives. It is suggested that the improved system performance of Fe loaded MgH2is attributed to restrictions on crystal growth of MgH2and the catalytic behavior of Fe nanoparticles, rather than any intrinsic catalytic properties offered by the formed mixed metal phase Mg2FeH6.
authors.affiliation: Nanoengineering Research Group, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal.
authors.forename: D
authors.initials: D
authors.lastname: Pukazhselvan
authors.affiliation: Nanoengineering Research Group, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal.
authors.forename: Narendar
authors.initials: N
authors.lastname: Nasani
authors.affiliation: Nanoengineering Research Group, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal.
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.affiliation: Nanoengineering Research Group, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal.
authors.forename: Igor
authors.initials: I
authors.lastname: Bdikin
authors.affiliation: CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193, Aveiro, Portugal.
authors.forename: Andrei V
authors.initials: AV
authors.lastname: Kovalevsky
authors.affiliation: Nanoengineering Research Group, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal.
authors.forename: Duncan P
authors.initials: DP
authors.lastname: Fagg
keywords: Fe-carbon composites; X-ray diffraction; catalysis; dehydrogenation; magnesium hydride