Akademik Veri Yönetim Sistemi
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, cilt.147, sa.16, ss.9025-9035, 2022 (SCI-Expanded)
The thermal behaviours and kinetics of biodiesels produced from beef tallow and corn oils were examined by using thermal analysis techniques (TG-DTG/DSC) at different heating rates in this study. The biodiesels were analysed with H-1-NMR and GC-MS techniques. It was seen that the biodiesel samples are composed of both saturated (Myristic acid C14:0, palmitic acid C16:0, stearic acid C18:0,) and unsaturated (Palmitoleic acid C16:1, oleic acid C18:1, linoleic acid C18:2) FAMEs from GC-MS analysis. Kinetic parameters for the combustion process of biodiesels were determined by using the iso-conversional model-free methods, KAS and FWO methods. The activation energy of beef-tallow biodiesel from KAS method is 86.11 kJ mol(-1), and from FWO method is 83.52 kJ mol(-1). The activation energy of corn-oil biodiesel from KAS method is 79.12 kJ mol(-1), and from FWO method is 90.07 kJ mol(-1). It was figured out that the activation energies of the biodiesel samples have values close to each other, and controlling reaction mechanism for both biodiesel samples by using master-plot method are power law (P-4). It was obtained CP (cloud point) and CFPP (cold filter plugging point) values from DSC analysis. CP values of biodiesel from beef tallow and corn oil are 16.1 degrees C and - 5.5 degrees C, respectively. CFPP values of biodiesel from beef tallow and corn oil are - 11.2 degrees C and - 6.7 degrees C, respectively. It was obtained from TG-DSC analysis that the origins of biodiesel samples on thermal behaviours are dominant at low temperatures (< 0 degrees C), yet the origins are not important at high temperature, and the combustion properties are the same as each other.