Thermal degradation processes for a series of mixtures of oil shale/plastic were investigated
using thermogravimetric analysis (TGA) at four heating rates of 2, 10, 20 and 50 K min−1 from
ambient temperature to 1273 K. High density polyethylene (HDPE), low density polyethylene
(LDPE) and polypropylene (PP) were selected as plastic samples. Based on the results
obtained, three thermal stages were identified during the thermal degradation. 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. The maximum degradation temperatures
of each component in the mixture were higher than those of the individual components;
thus an increase in thermal stability was expected. In addition, a kinetic analysis was
performed to fit thermogravimetric data. A reasonable fit to the experimental data was
obtained for all materials and their mixtures.