This research delves into the geochemical aspects, non-isothermal thermogravimetric analysis, and model-free kinetics of oil shale samples from the Çeltek region in Amasya, Türkiye. Shifting the focus to the core of the research, thermal and mass spectrometric analysis (TG–DTG–MS) experiments were conducted in an air atmosphere, employing three distinct heating rates of 10, 20, and 30 °C/min. The outcomes revealed two successive reaction stages: the breakdown of organic matter and mineral decomposition. In the breakdown stage, activation energy values exhibited a range of 160–163 kJ/mol, while in the mineral decomposition stage, the values varied between 208–214 kJ/mol, using model-free kinetic models.
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