TGA decomposition kinetics of 1-butyl-2,3-dimethylimidazolium tetrafluoroborate and the thermal effects of contaminants

• Published in: The Journal of chemical thermodynamics Vol. 37; no. 9; pp. 900 - 905
• Main Authors: Fox, D.M., Gilman, J.W., De Long, H.C., Trulove, P.C.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-09-2005; Elsevier
• Subjects: Chemistry; Chloride; Decomposition; Exact sciences and technology; General and physical chemistry; Imidazolium; Impurities; Kinetics; Room temperature ionic liquids; Solutions; Solvation. Solvent properties; TGA; Thermal stability; Water; Water; Imidazolium; Room temperature ionic liquids; Chloride; Impurities; Decomposition; Kinetics; Thermal stability; TGA; Impurity; Thermogravimetry; Temperature effect; Modeling; Ionic liquid; Kinetic model; Chlorides; Thermal analysis
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2005.04.020

Thermal gravimetric analysis (TGA) has been used to determine the kinetics of decomposition for 1-butyl-2,3-dimethylimidazolium tetrafluoroborate ([BMMIM][BF
4]) and to identify the effects of contaminants on the decomposition temperatures. Data were collected from both isothermal and constant ramp rate programs for the decomposition of [BMMIM][BF
4] under N
2. The isothermal data were fit to a global kinetic model and the apparent Arrhenius parameters were determined. The constant heating rate data were used to determine the apparent activation energy using the isoconversional method developed by Friedman. The effects of up to 10
wt.% water, NH
4BF
4, NH
4Cl, and [BMMIM][Cl] impurities on [BMMIM][BF
4] decomposition temperatures were investigated. The only contaminant to significantly affect the decomposition was NH
4Cl, resulting in some decomposition at the temperatures associated with [BMMIM][Cl] decomposition.