Thermal characterization of crude oils in the presence of limestone matrix by TGA-DTG-FTIR

Three different kinetic models (Arrhenius, Coats & Redfern and Ingraham & Marrier) were used for analysis of TGA-DTG curves in LTO and HTO regions. Activation energy values of the crude oil samples were varied between 6.9-10.6 kJ/mol in low temperature oxidation and 91.8-.0-181.9 kJ/mol in high temperature oxidation regions. For two crude oils activation energies are similar in low temperature oxidation region. In high temperature oxidation region, crude oil with higher content of asphaltenes has larger activation energy.