Effect of group IV elements on the thermodynamic property of NaH + Al

Christopher C. Nwakwuo, Nico Eigen, Martin Dornheim and Rudiger Bormann

Renewable Energy, 2012, vol. 43, issue C, 172-178

Abstract: The destabilizing effect of (X) group IV elements (C, Si, Sn and Ge) on NaH + Al was investigated. A significant decrease in the desorption temperature as well as the reaction enthalpy of NaH was achieved with additions of C, Si, Ge and Sn due to the formation of NaAlGe and NaAlSi ternary and NaSn binary compounds. Compared to a reaction enthalpy of 114 kJ mol−1 H2 for NaH above 400 °C, lower reaction enthalpies of 94 kJ mol−1 H2, 72 kJ mol−1 H2, 20 kJ mol−1 H2 and 2 kJ mol−1 H2 were obtained for the NaH + Al + C, NaH + Al + Si, NaH + Al + Ge and NaH + Al + Sn mixtures with onsets at 270 °C, 220 °C, 180 °C, and 130 °C respectively. Reversible hydrogenation was partly achieved in the NaH–Al–Si system with the formation of NaAlH4 + Si.

Keywords: Hydrogen storage materials; Thermodynamic properties; Calorimetry; X-ray diffraction; Sodium hydride; Sodium alanate (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:43:y:2012:i:c:p:172-178

DOI: 10.1016/j.renene.2011.11.036

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