Study of thermal and thermocatalytic conversion of licuri oil (Syagrus Coronata) using KIT-6 to obtain renewable hydrocarbons
renewable hydrocarbons; Syagrus Coronata; KIT-6; kinetic study
The use of fuels derived from fossil sources has caused major global challenges, and the development of research in search of renewable energy resources is relevant. Thus, the present work aims to evaluate the potential of licuri oil (Syagrus Coronata) to obtain renewable hydrocarbons from its thermal and thermocatalytic conversion using KIT-6 type catalysts supported with nickel and molybdenum. The catalysts were characterized by X-Ray Diffractometry (XRD), Thermogravimetric Analysis (TGA), Fourier Transform InfraRed spectroscopy (FTIR) and Scanning Electron Microscopy (SEM/EDS). From the characterization of the materials, it was verified that the KIT-6 presented a well-ordered structure and that it remained unchanged after the impregnation of the metals to the support. A thermal and thermocatalytic study was carried out using thermogravimetric data obtained at heating rates of 10, 20, 30 and 40 °C/min, where a greater conversion was noted when the sample was heated more slowly. Through the kinetic study applying the Ozawa-Flynn-Wall (OFW) and Kissinger-Akahira-Sunose (KAS) model, it was verified based on the values of the correlation coefficient (R²) that the KAS model best suits the process of thermal and thermocatalytic degradation of licuri oil. The OL, OLK, OLKNi, OLKMo and OLKNiMo samples exhibited, respectively, average apparent activation energy (Ea) of 75.63; 102.49; 78.11; 85.57 and 122.11 KJ/mol. Based on these results, it was verified that the presence of catalysts led to an increase in Ea values in relation to the thermal test of the oil, suggesting the occurrence of polymerization reactions. Thus, the evaluation of the products obtained in the pyrolysis process is important in clarifying the catalytic activity of the materials.