EAP - Oil Shale publications

PUBLISHED
SINCE 1984

Oil Shale

ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)

Open Access Journal

CiteScore: 2.6

Impact Factor (2022): 1.9

VARIABLE REACTION ORDER FOR KINETIC MODELING OF OIL SHALE PYROLYSIS; pp. 296–308

PDF | doi: 10.3176/oil.2011.2.04

Author

O. S. Al-AYED

Abstract

This work investigates kinetics of El-Lajjun oil shale pyrolysis. The kinetic data obtained from TG/DGA curves at heating rates 1, 3, 5, 10 and 30 °Cmin^–1 to a final pyrolysis temperature 550 °C were employed assuming their second-order kinetics to determine apparent activation energy, 99–141.4 kJ/mol and frequency factor, 1.89·10⁷ to 1.71·10¹¹, for each heating rate using the Coats & Redfern method. The obtained values of apparent activation energies and frequency factor were modified through an equation to 112–179 kJ/mol and 3.95·10⁷–3.66·10¹³, respectively, to fit the developed kinetic equation.
In this study, kinetic modeling of the pyrolysis process was performed using a newly developed variable reaction order. The variable reaction order was inferred directly from the experimental data and correlated with heating rate, h, (°Cmin^–1), rate of conversion, dx/dt and a constant equal with 8.314 (°C). The range of generated values of the variable reaction order varied between 1.99 and 1.85.
Conversion of a sample was calculated basing on initial and final weight of the sample at the end of run. A satisfactory fit of the experimental data was obtained using the equation developed for a variable reaction order.

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