Volume 18, Issue 3, November 2016, Pages 938–950
Amina Bedoui1, Souad Souissi-Najar2, and Abdelmottaleb Ouederni3
1 National School of Engineers of Gabes University of Gabes, Tunisia
2 National School of Engineers of Gabes University of Gabes, Tunisia
3 Laboratory of Engineering Process and Industrial System (LR GPSI), National School of Engineers of Gabes (ENIG), University of Gabes (UG), Omar Ibn Elkhattab Street, 6029 Gabes, Tunisia
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The aim of this paper is to study of the thermal degradation of Tunisian olive stones by non-isothermal thermogravimetric analysis (TGA) device, under nitrogen atmosphere. Thermogravimetric analysis of different particles sizes (0.63-2.5mm) was evaluated. The effect of heating rates has been performed. Results showed that particles sizes don't have any effect on the pyrolysis of olive stones whereas the decomposition process is shifted to higher temperature zone with heating rate increasing. Three different kinetic models, the iso-conversional; kissinger-Akahira-Sunose, Ozawa-Flynn-Wall methods and Coats Redfern model were applied on TGA data of olive stones (OS) to calculate the kinetic parameters including activation energy, pre-exponential factor and reaction order. Simulation of olive stones pyrolysis using data obtained from TGA analysis showed good agreement with experimental data for all models. The dependence of the apparent activation energy determined using kissinger-Akahira-Sunose (KAS) and Ozawa-Flynn-Wall (OFW) methods, on the conversion degree reveals that pyrolysis progress rather through multi-steps kinetics.
Author Keywords: TGA, thermal degradation, iso-conventional methods, Activation energy.
Amina Bedoui1, Souad Souissi-Najar2, and Abdelmottaleb Ouederni3
1 National School of Engineers of Gabes University of Gabes, Tunisia
2 National School of Engineers of Gabes University of Gabes, Tunisia
3 Laboratory of Engineering Process and Industrial System (LR GPSI), National School of Engineers of Gabes (ENIG), University of Gabes (UG), Omar Ibn Elkhattab Street, 6029 Gabes, Tunisia
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The aim of this paper is to study of the thermal degradation of Tunisian olive stones by non-isothermal thermogravimetric analysis (TGA) device, under nitrogen atmosphere. Thermogravimetric analysis of different particles sizes (0.63-2.5mm) was evaluated. The effect of heating rates has been performed. Results showed that particles sizes don't have any effect on the pyrolysis of olive stones whereas the decomposition process is shifted to higher temperature zone with heating rate increasing. Three different kinetic models, the iso-conversional; kissinger-Akahira-Sunose, Ozawa-Flynn-Wall methods and Coats Redfern model were applied on TGA data of olive stones (OS) to calculate the kinetic parameters including activation energy, pre-exponential factor and reaction order. Simulation of olive stones pyrolysis using data obtained from TGA analysis showed good agreement with experimental data for all models. The dependence of the apparent activation energy determined using kissinger-Akahira-Sunose (KAS) and Ozawa-Flynn-Wall (OFW) methods, on the conversion degree reveals that pyrolysis progress rather through multi-steps kinetics.
Author Keywords: TGA, thermal degradation, iso-conventional methods, Activation energy.
How to Cite this Article
Amina Bedoui, Souad Souissi-Najar, and Abdelmottaleb Ouederni, “Thermal degradation of Tunisian olive stones using thermogravimetric analysis (TGA),” International Journal of Innovation and Applied Studies, vol. 18, no. 3, pp. 938–950, November 2016.
