Pyrolysis Behaviour and Kinetics of Moroccan Oil Shale with Polystyrene

A. Aboulkas; K. El harfi; M. Nadifiyine; M. Benchanaa
Pyrolysis of oil shale/polystyrene mixture was performed in a thermogravimetric analyzer (TGA) from room temperature to 1273K, at heating rates of 2, 10, 20, 50 and 100 K/min. The global mass loss during oil shale/polystyrene pyrolysis was modelled by a combination of mass-loss events for oil shale and for polystyrene volatiles. TGA results indicate that mixture pyrolysis can be identified as three phases. The first is attributed to the drying of absorbed water; the second was dominated by the overlapping of organic matter and plastic pyrolysis, while the third was linked to the mineral matter pyrolysis, which occurred at much higher temperatures. Discrepancies between the experimental and calculated TG/DTG profiles were considered as a measurement of the extent of interactions occurring on co-pyrolysis (10% of the difference between experimental and calculated curves in the temperature range 600-900 K). The maximum degradation temperature of each component in the mixture was higher than those the individual components. The calculated residue was found to be higher than experimental. These experimental results indicate a significant synergistic effect during pyrolysis of mixture of oil shale and polystyrene. The kinetic studies were performed using Flynn-Wall-Ozawa (FWO) method. The overall activation energies were 87 kJ/mol for organic matter of oil shale, 169 kJ/mol for polystyrene and 161 kJ/mol for the mixture. Thus, it has been found that there exists an overall synergy, when two materials were pyrolysed together.
thermogravimetric; pyrolysis; kinetics; oil shale; polystyrene.
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