Affects of Mechanical Milling and Metal Oxide Additives on Sorption Kinetics of 1:1 LiNH 2 /MgH 2 Mixture

Donald L. Anton, Christine J. Price and Joshua Gray
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Donald L. Anton: Savannah River National Laboratory/Aiken, SC 29803, USA
Christine J. Price: Savannah River National Laboratory/Aiken, SC 29803, USA
Joshua Gray: Savannah River National Laboratory/Aiken, SC 29803, USA

Energies, 2011, vol. 4, issue 5, 1-19

Abstract: The destabilized complex hydride system composed of LiNH 2 :MgH 2 (1:1 molar ratio) is one of the leading candidates of hydrogen storage with a reversible hydrogen storage capacity of 8.1 wt%. A low sorption enthalpy of ~32 kJ/mole H 2 was first predicted by Alapati et al. utilizing first principle density function theory (DFT) calculations and has been subsequently confirmed empirically by Lu et al. through differential thermal analysis (DTA). This enthalpy suggests that favorable sorption kinetics should be obtainable at temperatures in the range of 160 °C to 200 °C. Preliminary experiments reported in the literature indicate that sorption kinetics are substantially lower than expected in this temperature range despite favorable thermodynamics. Systematic isothermal and isobaric sorption experiments were performed using a Sievert’s apparatus to form a baseline data set by which to compare kinetic results over the pressure and temperature range anticipated for use of this material as a hydrogen storage media. Various material preparation methods and compositional modifications were performed in attempts to increase the kinetics while lowering the sorption temperatures. This paper outlines the results of these systematic tests and describes a number of beneficial additions which influence kinetics as well as NH 3 formation.

Keywords: hydrogen storage; lithium amide; magnesium hydride; isothermal kinetics; oxide (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2011
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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