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Comparative study on thermal cracking of Athabasca bitumen

Comparative study on thermal cracking of Athabasca bitumen In this study, three commonly used isoconversional methods, namely: Ozawa–Flynn–Wall (OFW), Kissinger–Akahira–Sunose (KAS), and the advanced non-linear integral method of Vyazovkin (NLN) were employed for the first time for calculating the activation energy for thermal cracking of Athabasca bitumen under inert conditions. Thermal cracking of Athabasca bitumen was carried out at nonisothermal conditions at different heating rates under nitrogen atmosphere using thermogravimetic analyzer (TG). One isothermal TG experiment was conducted for model prediction. Differences in the values of activation energy determined from the three methods selected have been demonstrated. These differences were mainly attributed to the approximations used for the temperature integral employed in the integral methods. Nonetheless, all the methods tested in this study provided satisfactory isothermal predictions. The study showed that, among the three methods tested, the NLN method provided more accurate results. This is because NLN is approximation free and uses small time segments for the temperature integral. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Thermal Analysis and Calorimetry Springer Journals

Comparative study on thermal cracking of Athabasca bitumen

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References (40)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Akadémiai Kiadó, Budapest, Hungary
Subject
Chemistry; Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation
ISSN
1388-6150
eISSN
1572-8943
DOI
10.1007/s10973-013-3024-4
Publisher site
See Article on Publisher Site

Abstract

In this study, three commonly used isoconversional methods, namely: Ozawa–Flynn–Wall (OFW), Kissinger–Akahira–Sunose (KAS), and the advanced non-linear integral method of Vyazovkin (NLN) were employed for the first time for calculating the activation energy for thermal cracking of Athabasca bitumen under inert conditions. Thermal cracking of Athabasca bitumen was carried out at nonisothermal conditions at different heating rates under nitrogen atmosphere using thermogravimetic analyzer (TG). One isothermal TG experiment was conducted for model prediction. Differences in the values of activation energy determined from the three methods selected have been demonstrated. These differences were mainly attributed to the approximations used for the temperature integral employed in the integral methods. Nonetheless, all the methods tested in this study provided satisfactory isothermal predictions. The study showed that, among the three methods tested, the NLN method provided more accurate results. This is because NLN is approximation free and uses small time segments for the temperature integral.

Journal

Journal of Thermal Analysis and CalorimetrySpringer Journals

Published: Nov 1, 2013

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