TY  - JOUR
EP  - 270
PB  - Springer Netherlands
SN  - 13886150
N1  - cited By 28
SP  - 261
TI  - Thermokinetics of alkyl methylpyrrolidinium NTf2 ionic liquids: Effect of alkyl chain on thermal stability
AV  - none
JF  - Journal of Thermal Analysis and Calorimetry
A1  - Quraishi, K.S.
A1  - Bustam, M.A.
A1  - Krishnan, S.
A1  - Khan, M.I.
A1  - Wilfred, C.D.
A1  - Lévêque, J.-M.
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85011876494&doi=10.1007%2fs10973-016-5994-5&partnerID=40&md5=43f260afeb9676c06f47483222906adc
VL  - 129
Y1  - 2017///
N2  - Abstract: The thermal degradation of two ionic liquids (ILs) was investigated using thermogravimetric analysis (TG) to establish a relationship between the thermokinetics and thermal stability. N-butyl, N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide BMPyrroNTf2 and N-octyl, N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imideOMPyrroNTf2 were subjected to thermogravimetric analysis at varying heating rates of 5, 10 and 20 °C minâ??1 in the temperature range of 50â??600 °C. The data obtained were analysed for thermokinetics using Ozawa, Kissinger and Starink methods using differential thermogravimetric (DTG) techniques, and Flynnâ??Wallâ??Ozawa (FWO), Kissingerâ??Akahiraâ??Sunose (KAS) and Starink methods using TG techniques. The results produced very high regression coefficients (R2) values around 0.996, which exhibited that they were best fitted by the kinetics equations. The average calculated activation energy (Ea) of BMPyrroNTf2 using FWO, KAS and Starink methods was 128.6, 123.6 and 124 kJ molâ??1, respectively, and 113.7, 107.8 and 108.2 kJ molâ??1, respectively, for OMPyrroNTf2 using same empirical methods. This emphasizes that the activation energy is strongly related to the length of the side alkyl chain of a given IL. In other words, the longer the side alkyl chain, the lower the activation energy. The Ea trends with degree of conversion (α) suggest that a single mechanism without formation of intermediates or short-life intermediates was followed by the pyrolysis kinetics. This study introduced thermokinetics as a tool to study the thermal stability of ionic liquids. Graphical Abstract: Figure not available: see fulltext.. © 2017, Akadémiai Kiadó, Budapest, Hungary.
IS  - 1
ID  - scholars8571
KW  - Activation analysis; Activation energy; Ionic liquids; Thermodynamic stability
KW  -  Activation energies (Ea); Degree of conversion; Differential thermogravimetric; Ionic liquid (ils); Model-free method; Pyrolysis kinetics; Regression coefficient; Thermokinetics
KW  -  Thermogravimetric analysis
ER  -