Kinetic Analysis of the oil shale pyrolysis using thermogravimetry and Differential Scanning Calorimetry

The organic and mineral matter are directly linked to the oil shale, allowing multiple reactions in parallel that may result in different behaviors. An in-depth study using the techniques of Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) non-isothermal were performed. The oil shale was extracted from Basin Irati being supplied by Petrobras/SIX located in the city of Sao Mateus do Sul, Parana, Brazil. The parameters analysed through shale pyrolysis kinetics were evaluated using the ASTM E-698 and Flynn-Wall-Ozawa (FWO) methods, with analysis and a comparison of parameters the activation energy and exponential factor. The experiments were done at different heating rates, from 298 K - 1,173 K for TGA and 298 K - 873 K for DSC both with nitrogen atmosphere flow of 50 mL/min. The results showed a correlation between TGA and DSC and that, for both processes, the shale underwent thermal decomposition in three steps. Activation energy values decreased throughout the process due to the decrease in the amount of organic matter. Copyright © 2017, AIDIC Servizi S.r.l.