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

Perizat Berdiyeva, Anastasiia Karabanova, Jakob B. Grinderslev, Rune E. Johnsen, Didier Blanchard, Bjørn C. Hauback and Stefano Deledda
Additional contact information
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

Energies, 2020, vol. 13, issue 11, 1-14

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.

Keywords: metal chlorides; solid solution; mixed hexammines; ammonia storage; in situ powder X-ray diffraction (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: 2020
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