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Energies 2011, 4(5), 826-844; doi:10.3390/en4050826

Affects of Mechanical Milling and Metal Oxide Additives on Sorption Kinetics of 1:1 LiNH2/MgH2 Mixture

Savannah River National Laboratory/Aiken, SC 29803, USA
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Received: 18 March 2011 / Revised: 5 May 2011 / Accepted: 6 May 2011 / Published: 20 May 2011
(This article belongs to the Special Issue Hydrogen Storage)
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Abstract

The destabilized complex hydride system composed of LiNH2:MgH2 (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 H2 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 NH3 formation. View Full-Text
Keywords: hydrogen storage; lithium amide; magnesium hydride; isothermal kinetics; oxide hydrogen storage; lithium amide; magnesium hydride; isothermal kinetics; oxide
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Anton, D.L.; Price, C.J.; Gray, J. Affects of Mechanical Milling and Metal Oxide Additives on Sorption Kinetics of 1:1 LiNH2/MgH2 Mixture. Energies 2011, 4, 826-844.

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