Investigation of kinetic compensation effect in lignocellulosic biomass torrefaction: Kinetic and thermodynamic analyses

Zhiqing Zhang, Hanqi Duan, Youjun Zhang, Xiaojuan Guo, Xi Yu, Xingguang Zhang, Md.Maksudur Rahman, Junmeng Cai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The kinetic compensation effect between the activation energy and the pre-exponential factor has extensively existed in the thermochemical conversion processes of lignocellulosic biomass. The research on the kinetic compensation effect in lignocellulosic biomass torrefaction has been insufficient yet. The torrefaction of the pinewood sample was experimentally investigated by thermogravimetric analysis (TGA) at five isothermal temperatures of 220, 250, 265, 280 and 295 °C. The reaction order model was used to analyze the isothermal torrefaction kinetics of lignocellulosic biomass, and the results showed that many sets of activation energy and pre-exponential factor could describe the experimental data at each temperature equally well and they excellently satisfied the kinetic compensation effect relationship. The linear regression lines of the kinetic compensation effect points at different temperatures intersected at one point, whose values corresponded to the obtained optimal kinetic parameters. A kinetic-compensation-effect-based method was developed and verified to determine the kinetic parameters of isothermal biomass torrefaction. Based on the optimal kinetic parameters, the thermodynamic parameters (including Gibbs free energy, enthalpy, and entropy) of biomass torrefaction processes at various temperatures were calculated and analyzed.
Original languageEnglish
Article number118290
JournalEnergy
Volume207
Early online date6 Jul 2020
DOIs
Publication statusPublished - 15 Sep 2020

Bibliographical note

© 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Activation energy
  • Biomass torrefaction
  • Isothermal kinetics
  • Kinetic compensation effect
  • Thermodynamic analysis

Fingerprint

Dive into the research topics of 'Investigation of kinetic compensation effect in lignocellulosic biomass torrefaction: Kinetic and thermodynamic analyses'. Together they form a unique fingerprint.

Cite this