This work aims to study the thermal decomposition kinetics of energy cane Saccharum robustum. The experiments were carried out in a thermogravimetric analyzer at heating rates of 5, 10 and 20 °C/min under nitrogen atmosphere and mean particle diameter of 253.5 μm.

Three thermal decomposition...

This work aims to study the thermal decomposition kinetics of energy cane Saccharum robustum. The experiments were carried out in a thermogravimetric analyzer at heating rates of 5, 10 and 20 °C/min under nitrogen atmosphere and mean particle diameter of 253.5 μm.

Three thermal decomposition stages were identified: dehydration, pyrolysis and carbonization. The activation energies were determined through three model-free methods (Friedman, Flynn-Wall-Ozawa, and Vyazovkin) varying between 107.5 and 204 kJ/mol. The master plots showed different representations of conversion functions (reaction orders from 2 to 7). The linear model fitting method validated the activation energy (177.1 kJ/mol) obtained by single-step reaction. Moreover, a multi-step method was proposed considering four independent parallel reactions (extractives, hemicellulose, cellulose, and lignin) obtaining activation energies from 60 to 181 kJ/mol, pre-exponential factor from 1.1 ∙ 102 to 5.8 ∙ 1012 1/s, 1st and 3rd reaction orders, and compositions from 0.12 to 0.43 with high quality of fit

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

Fechado