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

Author

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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)

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.

Suggested Citation

  • Donald L. Anton & Christine J. Price & Joshua Gray, 2011. "Affects of Mechanical Milling and Metal Oxide Additives on Sorption Kinetics of 1:1 LiNH 2 /MgH 2 Mixture," Energies, MDPI, vol. 4(5), pages 1-19, May.
    • Handle: RePEc:gam:jeners:v:4:y:2011:i:5:p:826-844:d:12461
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    References listed on IDEAS

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    1. Ping Chen & Zhitao Xiong & Jizhong Luo & Jianyi Lin & Kuang Lee Tan, 2002. "Interaction of hydrogen with metal nitrides and imides," Nature, Nature, vol. 420(6913), pages 302-304, November.
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    1. Sebastiano Garroni & Antonio Santoru & Hujun Cao & Martin Dornheim & Thomas Klassen & Chiara Milanese & Fabiana Gennari & Claudio Pistidda, 2018. "Recent Progress and New Perspectives on Metal Amide and Imide Systems for Solid-State Hydrogen Storage," Energies, MDPI, vol. 11(5), pages 1-28, April.

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