ABSTRACT
This study investigated the pyrolysis properties and kinetic behavior of Ermenek (Konya, Turkey) lignite. For this purpose, lignite was carbonized at 500°C and different heating rates (5, 10, 15, and 20°C/min). Proximate, elemental, XRF, and TGA-DTA lignite and chars were performed. Thermal analyses were performed at a heating rate of 10°C/min from room temperature to 1000°C and an inert (N2) gas flow of 50 ml/min. Peak temperatures and mass losses were determined from the data obtained from the experiments. By examining the thermogram curves, three different temperature regions depended on moisture loss, the release of volatile matter, and fixed carbon combustion. In addition, from these data, kinetic calculations were performed using Arrhenius and Coats-Redfern approaches, and the apparent activation energies were calculated for each region. The activation energy values calculated according to the Coats-Redfern kinetic model are significantly lower than those calculated according to the Arrhenius kinetic model. The highest activation energies calculated were: for Region 1 and Region 2 at 5°C/min heating rate and for Region 3 at 10°C/min heating rate.
Acknowledgments
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. Author Yeliz Akbulut is a 100/2000 The Council of Higher Education (CoHE) Ph.D. Scholar in Fuels (Fossil and Bio) and Combustion subdivision. Also, Author Yeliz Akbulut is a 2211-C The Scientific and Technical Council of Turkey (TUBITAK) Ph.D.
Disclosure Statement
No potential conflict of interest was reported by the author(s).
Author’s Contributions
All authors contributed equally to the article. All authors read and approved the final manuscript.
Availability Of Data And Materials
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Correction Statement
This article has been republished with minor changes. These changes do not impact the academic content of the article.