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Investigation of thermodynamic properties of magnesium chloride amines by HPDSC and TG. For application in a high-lift high-temperature chemical heat pump

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Author: Bevers, E.R.T. · Oonk, H.A.J. · Haije, W.G. · Ekeren, P.J. van
Type:article
Date:2007
Institution: TNO Defensie en Veiligheid
Source:Journal of Thermal Analysis and Calorimetry, 3, 90, 923-929
Identifier: 182954
doi: DOI:10.1007/s10973-006-8247-1
Keywords: Chemistry · Ammonia · Chemical heat pump · DSC · Magnesium chloride · Stability diagram · TG · Thermodynamic properties · Ammonia · Chemical heat pump · DSC · Magnesium chloride · Stability diagram · TG · Thermodynamic properties · Differential scanning calorimetry · Magnesium compounds · Thermodynamic properties · Thermogravimetric analysis · Chemical heat pump · High-pressure differential scanning calorimetry (HPDSC) · Magnesium chloride · Stability diagram · Ammonia

Abstract

The formation as well as the decomposition of magnesium chloride ammonia complexes was studied by high-pressure differential scanning calorimetry (HPDSC) and thermogravimetric analysis (TG). HPDSC runs were performed under constant ammonia pressure conditions to determine the transition temperatures and stability regions of the ammonia complexes. The TG technique has been employed to examine the stoichiometry of the complexes. The hexa-, di-and mono-ammines are proven to exist under our experimental conditions. The decomposition of the mono ammine to pure MgCl2 occurs most probably in two steps. © 2007 Springer Science+Business Media, LLC.