Thermal Breakdown Kinetics of 1-Ethyl-3-Methylimidazolium Ethylsulfate Measured Using Quantitative Infrared Spectroscopy

Keywords

Quantitative spectroscopy, ionic liquids, thermal decomposition, [EMIM][EtSO4], kinetics

Abstract

In this work, the thermal stability of the room temperature ionic liquid (RTIL) 1-ethyl-3-methylimidazolium ethylsulfate ([EMIM][EtSO4]) is investigated using infrared (IR) spectroscopy. Quantitative IR absorption spectral data are measured for heated [EMIM][EtSO4]. Spectra have been collected between 25 ℃ and 100 ℃ using a heated optical cell. Multiple samples and cell pathlengths are used to determine quantitative values for the molar absorptivity of [EMIM][EtSO4]. These results are compared to previous computational models of the ion pair. These quantitative spectra are used to measure the rate of thermal decomposition of [EMIM][EtSO4] at elevated temperatures. The spectroscopic measurements of the rate of decomposition show that thermogravimetric methods overestimate the thermal stability of [EMIM][EtSO4].

Original Publication Citation

Jeffrey L. Wheeler, McKinley Pugh, S. Jake Atkins, Jason M. Porter, Thermal breakdown kinetics of 1-ethyl-3-methylimidazolium ethylsulfate measured using quantitative infrared spectroscopy, Applied Spectroscopy, (2017) vol.71(12), pp. 2626-2631.

Document Type

Peer-Reviewed Article

Publication Date

2017

Publisher

Sage Journals

Language

English

College

Ira A. Fulton College of Engineering and Technology

Department

Mechanical Engineering

University Standing at Time of Publication

Associate Professor

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