Avaliação cinética do bagaço da Cana Energia para a produção de biocombustíveis

Abstract

The excessive consumption of fossil energy has been the subject of worldwide discussions due to the environmental problems generated by its use. With this, studies have been developed considering a new source of energy, biomass, a renewable energy source and with less negative impacts on the environment. Biomass from Cana Energia has characteristics modified from conventional sugarcane to be more productive in the manufacture of biofuel and generation of renewable energy. acetylation, to make its fiber more accessible in the thermal and thermocatalytic pyrolysis process, and consequently produce biofuels with high added value. For this purpose, the objective of this work is to evaluate the behavior of catalysts impregnated with cobalt in the thermochemical conversion of Cana Energia. The obtained catalytic materials were characterized by X-ray fluorescence spectroscopy (FRX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). It can be observed through the FRX, DRX and FTIR techniques that there was impregnation of the oxide and that the material did not present changes in its structure after the incorporation of Cobalt. As lignocellulosic biomass has a highly stable vegetal crystalline structure, Cana Energia was acetylated and analyzed by thermogravimetry, in which the behavior shown proves the replacement of hydroxyl-OH groups by acetyl-COCH3 groups due to the decrease in degradation temperature intervals. The biomass with and without the presence of catalysts was analyzed by thermogravimetry in order to evaluate the kinetic parameters by the Ozawa-Flynn-Wall (OFW) and KissingerAkahira-Sunose (KAS) models. The results found that the model that best fits is the KAS, because the R² values ​​in this model are closer to the expected. Based on the activation energy (Ea) results, it is inferred that the biomass in the presence of the Al2O3 catalyst presented the lowest values ​​of activation energy (Ea) in relation to the isolated biomass.