Abstract
Torrefaction pretreatment can upgrade biomass by reducing its oxygen content. In this study, torrefaction pretreatments with different severities (200 °C, 230 °C, 260 °C, and 290 °C) were employed to study their effects on the pyrolysis behaviors and kinetics of cellulose. Results showed that pretreatment at 290 °C was highly effective for oxygen removal. Among the torrefied samples, the solid product of cellulose torrefied at 290 °C had the lowest mass yield of 81.80%, lowest energy yield of 89.60%, highest carbon content of 44.91%, and highest HHV of 16.67 MJ kg−1. Pyrolysis activation energy of torrefied cellulose changed slightly at 200–260 °C, but increased significantly at 290 °C. According to XRD results, at the torrefaction temperature of 290 °C, the crystal structure of cellulose changed significantly. The results of Py-GC/MS showed that the relative contents of anhydrosugars in the bio-oil were decreased by torrefaction pretreatment. The high temperature at 290 °C has the most significant effect on the performance of bio-oil.
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