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Prediction of long-term stability of ionic liquids at elevated temperatures by means of non-isothermal thermogravimetrical analysis

Title data

Seeberger, Andreas ; Andresen, Ann-Kathrin ; Jess, Andreas:
Prediction of long-term stability of ionic liquids at elevated temperatures by means of non-isothermal thermogravimetrical analysis.
In: Physical Chemistry Chemical Physics. Vol. 11 (2009) Issue 41 . - pp. 9375-9381.
ISSN 1463-9084
DOI: https://doi.org/10.1039/B909624H

Official URL: Volltext

Abstract in another language

The thermal stability of an ionic liquid (IL) is an important parameter and limits the maximum operation temperature. However, the definition of stability and of the maximum operation temperature, respectively, is still an open question. Typically, non-isothermal thermogravimetrical analysis (TGA) is used to determine the stability, which is then mostly defined by the onset temperature, i.e. by the temperature where a certain mass loss of e.g. 1% is reached. Unfortunately, the rate of mass loss depends on the apparatus and conditions (e.g. heating rate), and may be governed by evaporation or by thermal decomposition or by a combination of both. In this work, isothermal as well as non-isothermal TG/DTG measurements at different heating rates were used as basis to model the combined kinetics of evaporation and decomposition, thereby taking 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [BMIM][BTA] as an example. The measured and predicted mass losses are in good agreement, and the simulation of TG/DTG experiments by the methods outlined in this work leads to a reliable estimation of the evaporation (as shown by comparison with literature data) as well as of the decomposition rate. For a closed system, where the mass loss by evaporation is negligible, a novel criterion (1% mass loss by thermal decomposition within one year) is presented to estimate the maximum operation temperature of ILs.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Faculties
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 02 Feb 2015 11:19
Last Modified: 02 Feb 2015 11:19
URI: https://eref.uni-bayreuth.de/id/eprint/6153