In this study, four oil-shale samples (Niğde-Ulukışla) excavated from Central Anatolia Turkey were analyzed where this region
is believed to have a high potential of oil in its shale rich outcrops. The samples (∼40 g) were combusted at 50 psi gas injection
pressure, at an air injection rate of 1.5 L min−1 in a combustion-reaction cell. All the experiments were conducted up to 600°C. The percentages of oxygen consumption and
carbon monoxide and carbon dioxide production were obtained instantaneously with respect to time. The combustion periods and
relative reaction rates were determined by examining the effluent gas concentration peaks. Activation energies of the samples
were determined using Weijdema’s approach. It was observed that the activation energies of the samples are varied between
22–103 kJ mol−1.