期刊
JOURNAL OF CHEMICAL THERMODYNAMICS
卷 141, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2019.105947
关键词
Ionic liquid; Liquid range; Maximum operation temperature; Isobaric heat capacity
资金
- Spanish Ministry of Economy and Competitiveness [MAT2017-89239-C2-1-P, FIS2017-89361C3-3-P]
- Xunta de Galicia [GRC ED431C 2016/001, ED431E 2018/08]
- Galician Network of Ionic Liquids (ReGaLIs) [ED431D 2017/06]
- FEDER Program [MAT2017-89239-C2-1-P, FIS2017-89361C3-3-P]
Phase transitions, isobaric heat capacities and thermal stability of four ionic liquids (ILs) are determined in this work. The selected Ionic Liquids (ILs) have two different cations, pyridinium and choline, and they are combined with three different anions, acetate, dihydrogen phosphate and tosylate. Solid-solid and solid-liquid phase transitions and isobaric molar heat capacities are determined using two calorimeters, both based on the differential scanning calorimetry methodology. Thermal stability of the studied compounds is analysed through the thermogravimetric technique (TGA). Degradation temperatures are obtained from TGA experiments using the dynamic method, whereas isothermal TGA is used to determine the maximum operation temperature. The results show that, all the ILs present crystalline behaviour, with melting temperatures within the interval of 88 degrees C and 123 degrees C, whereas heat capacities linearly increases with temperature. A clear dependence with the anion is observed for both heat capacities and thermal stability, being ILs with the tosylate anion those presenting the highest values of molar heat capacities and the highest thermal stability. (C) 2019 Elsevier Ltd.
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