The pyrolysis characteristics and kinetics of Organosolv lignin from pine trees were investigated using isoconventional, generalized master plot, model-based, and Frazer-Suzuki deconvolution methods. With these approaches, the activation energies of Organosolv lignin pyrolysis were determined to be in the range of 70.11–385.58 kJ/mol. In addition, the activation energies of 3 pseudo-reactions were calculated to be 15.71, 204.49, and 32.76 kJ/mol, respectively, by the Frazer-Suzuki deconvolution method. The experimental data of Organosolv lignin pyrolysis were best fitted with the 4th power-law model (P4) with an absolute error of 3.24 %. Entropy (ΔSo), Gibbs free energy (ΔGo), and enthalpy (ΔHo) were also calculated to understand the reaction pathways from a thermodynamic point of view. Based on the pyrolysis mechanisms proposed in this study, the reaction rate constants of different steps were determined. The primary reaction route was identified to be the pyrolysis of Organosolv lignin to liquid products such as bio-oils. Among the alkali and alkaline earth metals (AAEMs) tested, 2.0 wt% Mg showed the most effective on Organosolv lignin pyrolysis, decreasing the mean activation energy (Ea) from 181.67 to 156.55 kJ/mol in the range 0 ≤ X ≤ 0.85. The compositions of gaseous and liquid products formed by pyrolysis were analyzed using a micro-tubing reactor. CO, CO2, and CH4 were observed as the main gaseous products, while Organosolv lignin was primarily decomposed into phenol and guaiacol derivatives. The Organosolv lignin was also depolymerized into lower-molecular-weight (LMW) components during the pyrolysis process.
|State||Published - Dec 1 2022|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2B5B01097547). This study has been worked with the support of a research grant of Kangwon National University in 2020. This work was also supported by the Engineering Research Center of Excellence Program of the Korea Ministry of Science, ICT & Future Planning (MSIP)/National Research Foundation of Korea (NRF) (Grant NRF-2021R1A5A6002853).
© 2022 Elsevier Ltd
- Micro-tubing reactor
- Organosolv lignin
- Pyrolysis kinetics
- Thermogravimetric analysis
ASJC Scopus subject areas
- Chemical Engineering (all)
- Fuel Technology
- Energy Engineering and Power Technology
- Organic Chemistry