Pyrolysis Kinetics of Oil Shale From Ulukişla, Turkey

Sütçü, Hale; Pişkin, Sabriye

doi:10.3176/oil.2009.4.05

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…Equations ( 8) and ( 9) were obtained plotting apparent activation energy and frequency factor estimated from equations ( 6) and (11), respectively. The need for using different values for apparent activation energy and frequency factors in the present work is possibly due to the difference in kinetic expressions employed for modeling.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, in most kinetic studies reporting on oil shale pyrolysis [9][10][11][12][13][14][15], the order of reaction was assumed to be either the first or the second order. In this research paper, a novel procedure was deduced to estimate reaction order.…”

Section: Resultsmentioning

confidence: 99%

“…The variation in the magnitude of the variable reaction order was similar in all runs in which a decrease from 1.99 to 1.85 and then an increase to 1.99 occurred. Variations in magnitude of reaction order were also reported and used to model pyrolysis kinetics of Turkish oil shale [11]. The highest value of variable reaction order calculated from initial rates of mass loss in case initial decomposition of oil shale was low and at various heating rates in all experimental runs was close to 1.99.…”

Section: Resultsmentioning

confidence: 99%

“…Turkish oil shale was studied by TGA at non-isothermal conditions under argon and firstorder reaction kinetics was found to fit kinetic data [10]. Some other Turkish oil shales were pyrolysed using thermogravimetric analysis and reaction orders were found to vary between 1.45 and 1.73 to fit pyrolysis kinetics [11]. Qing and co-workers used the first-order kinetics in their study on pyrolysis of Huadian oil shale since it resulted in best fit of experimental data [12].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Variable Reaction Order for Kinetic Modeling of Oil Shale Pyrolysis

Al-Ayed¹

2011

Oil Shale

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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•10 7 to 1.71•10 11 , 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•10 7 -3.66•10 13 , 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 dtand 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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Section: Resultsmentioning

confidence: 99%