Reversible formation of alcohol solvates and their potential use for heat storage
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in: Journal of Thermal Analysis and Calorimetry, Jahrgang 138, Nr. 1, 01.10.2019, S. 11-33.
Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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TY - JOUR
T1 - Reversible formation of alcohol solvates and their potential use for heat storage
AU - Korhammer, Kathrin
AU - Mihály, Judith
AU - Bálint, Szabolcs
AU - Trif, László
AU - Vass, Ádám
AU - Tompos, András
AU - Tálas, Emília
N1 - Publisher Copyright: © 2019, The Author(s).
PY - 2019/10/1
Y1 - 2019/10/1
N2 - In this study, CaCl 2 - and MgCl 2 –alcohol solvates of different stoichiometric quantities of ethyl alcohol (EtOH) and methyl alcohol (MeOH) were synthesized and characterized via coupled thermogravimetric–differential scanning calorimetry, thermogravimetric–mass spectrometric evolved gas analysis (TG-MS), spectroscopic analysis (Raman) methods as well as by X-ray diffraction. Correlations between the obtained calorimetric, thermodynamic, kinetic, and crystallographic data were carried out. The CaCl 2 –alcohol systems seem suitable for heat storage based on the feasible recovery of the salt. However, Raman spectroscopic results revealed that the MgCl 2 –EtOH solvates were instable compounds. Irreversible transformation of MgCl 2 –alcohol solvates related to the formation of alkyl chloride appeared upon heating, as proven by TG-MS and Raman spectroscopic measurements. Pure salt–alcohol solvates could not be prepared under technically applicable conditions. The samples contained at least traces of water. Appearance of side reactions resulting in magnesium oxychlorides, oxyhydroxides, and possible release of HCl with cycling may contribute to corrosion of reactor components. Based on these considerations, MgCl 2 –alcohol solvate systems are not recommended for heat storage.
AB - In this study, CaCl 2 - and MgCl 2 –alcohol solvates of different stoichiometric quantities of ethyl alcohol (EtOH) and methyl alcohol (MeOH) were synthesized and characterized via coupled thermogravimetric–differential scanning calorimetry, thermogravimetric–mass spectrometric evolved gas analysis (TG-MS), spectroscopic analysis (Raman) methods as well as by X-ray diffraction. Correlations between the obtained calorimetric, thermodynamic, kinetic, and crystallographic data were carried out. The CaCl 2 –alcohol systems seem suitable for heat storage based on the feasible recovery of the salt. However, Raman spectroscopic results revealed that the MgCl 2 –EtOH solvates were instable compounds. Irreversible transformation of MgCl 2 –alcohol solvates related to the formation of alkyl chloride appeared upon heating, as proven by TG-MS and Raman spectroscopic measurements. Pure salt–alcohol solvates could not be prepared under technically applicable conditions. The samples contained at least traces of water. Appearance of side reactions resulting in magnesium oxychlorides, oxyhydroxides, and possible release of HCl with cycling may contribute to corrosion of reactor components. Based on these considerations, MgCl 2 –alcohol solvate systems are not recommended for heat storage.
KW - Alcohol solvates
KW - Alkyl chloride formation
KW - CaCl
KW - Heat storage
KW - MgCl
KW - Energy research
KW - Chemistry
UR - http://www.scopus.com/inward/record.url?scp=85062716276&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/d18a044b-e9e1-3337-a7fa-dd0feda012a1/
U2 - 10.1007/s10973-019-08090-2
DO - 10.1007/s10973-019-08090-2
M3 - Journal articles
AN - SCOPUS:85062716276
VL - 138
SP - 11
EP - 33
JO - Journal of Thermal Analysis and Calorimetry
JF - Journal of Thermal Analysis and Calorimetry
SN - 1388-6150
IS - 1
ER -