Efecto catalítico del Na2CO3 sobre la pirólisis de los residuos del sorgo (Sorghum bicolor L. Moench)
DOI:
https://doi.org/10.15665/rp.v19i1.2160Abstract
In the present study, the catalytic effect of Na2CO3 on the pyrolysis of sorghum leaves and stalks was evaluated in the temperature range of 20 to 800 °C at three heating rates using thermogravimetric analysis coupled to Fourier transform infrared spectroscopy (TGA-FTIR). The results were adjusted with the nth-order reaction model, the isoconversional method, and the distributed activation energy model (DAEM). The latter model fits properly with three pseudo components to the first derivative thermogravimetry curves. The kinetic parameters calculated for the activation energy and pre-exponential factor are in the range of 159 to 195 kJ/mol, and 5.16E+13 to 5.13E+14 s-1, respectively. The analysis of the IR spectra allowed us to identify compounds such as, CO2, H2O, CH4, CO, HCN, C4H4O, HCOOH, and CH3COOH as the gases evolved during thermal decomposition. Moreover, the thermogravimetric curves show that the addition of sodium carbonate as a catalyst decreases the peak temperatures of the pyrolysis process of sorghum residues, and reduces the activation energy associated with the lignin and hemicellulose pyrolysis processes of the sorghum leaves and stems.
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