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Synthesis, Structure and NH 3 Sorption Properties of Mixed Mg 1-x Mn x (NH 3 ) 6 Cl 2 Ammines

Author

Listed:
  • Perizat Berdiyeva

    (Department for Neutron Materials Characterization, Institute for Energy Technology, P.O. Box 40, NO-2027 Kjeller, Norway)

  • Anastasiia Karabanova

    (Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, DK-2800 Lyngby, Denmark)

  • Jakob B. Grinderslev

    (Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark)

  • Rune E. Johnsen

    (Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, DK-2800 Lyngby, Denmark)

  • Didier Blanchard

    (Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, DK-2800 Lyngby, Denmark)

  • Bjørn C. Hauback

    (Department for Neutron Materials Characterization, Institute for Energy Technology, P.O. Box 40, NO-2027 Kjeller, Norway)

  • Stefano Deledda

    (Department for Neutron Materials Characterization, Institute for Energy Technology, P.O. Box 40, NO-2027 Kjeller, Norway)

Abstract

This paper describes the synthesis, crystal structure, and NH 3 sorption properties of Mg 1-x Mn x (NH 3 ) 6 Cl 2 ( x = 0–1) mixed metal halide ammines, with reversible NH 3 storage capacity in the temperature range 20–350 °C. The stoichiometry ( x ) dependent NH 3 desorption temperatures were monitored using in situ synchrotron radiation powder X-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry. The thermal analyses reveal that the NH 3 release temperatures decrease in the mixed metal halide ammines in comparison to pure Mg(NH 3 ) 6 Cl 2 , approaching the values of Mn(NH 3 ) 6 Cl 2 . Desorption occurs in three steps of four, one and one NH 3 moles, with the corresponding activation energies of 54.8 kJ⋅mol -1 , 73.2 kJ⋅mol -1 and 91.0 kJ⋅mol -1 in Mg 0.5 Mn 0.5 (NH 3 ) 6 Cl 2 , which is significantly lower than the NH 3 release activation energies of Mg(NH 3 ) 6 Cl 2 (E a = 60.8 kJ⋅mol -1 , 74.8 kJ⋅mol -1 and 91.8 kJ⋅mol -1 ). This work shows that Mg 1-x Mn x (NH 3 ) y Cl 2 ( x = 0 to 1, y = 0 to 6) is stable within the investigated temperature range (20–350 °C) and also upon NH 3 cycling.

Suggested Citation

  • Perizat Berdiyeva & Anastasiia Karabanova & Jakob B. Grinderslev & Rune E. Johnsen & Didier Blanchard & Bjørn C. Hauback & Stefano Deledda, 2020. "Synthesis, Structure and NH 3 Sorption Properties of Mixed Mg 1-x Mn x (NH 3 ) 6 Cl 2 Ammines," Energies, MDPI, vol. 13(11), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:11:p:2746-:d:365125
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