Authors
Taoqi Yang, Zhitong Yao, Yang Chen, Huanxuan Li, Shaodan Xu, Sachin Kumar, Yuhang Sun, Akash Kumar, Jie Liu, Wei Qi
Published in
Journal of environmental management. Volume 415. Pages 130591. Jul 31, 2026. Epub Jul 31, 2026.
Abstract
The valorization of alkali lignin, an abundant by-product of the pulp and paper industry, is crucial for advancing circular bioeconomy goals. In the present study, its chemical looping pyrolysis (CLP) using CoFe2O4 as an oxygen carrier was studied. Thermogravimetric analysis revealed that the incorporation of CoFe2O4 accelerated lignin decomposition, with peak temperatures declining from 466-493°C to 399-442°C. Fourier transform infrared spectrometry and gas chromatography/mass spectrometry analyses showed a shift in product distribution, with relative abundance of acetone increasing from 14% to 56.34%, while phenolic compounds significantly decreased. The activation energies decreased from an average of 245.39 kJ mol-1 for alkali lignin to 174.93 kJ mol-1 for lignin/CoFe2O4 blend. Linear lnA versus Ea correlation was observed and isokinetic temperatures were found to be 967.34 K and 942.99 K, respectively, supporting the appropriateness of A2 model for lignin conversion and F2 mechanism for the CLP process. Thermodynamic analysis showed a decrease in Gibbs free energy from 175.36 to 159.90 kJ mol-1, indicating enhanced thermodynamic favorability. Additionally, compensation effect analysis revealed compensation temperatures of 740.21 K for lignin and 681.96 K for the blend, confirming a consistent thermodynamic mechanism. These findings underscored the potential of CoFe2O4 to enhance the selectivity of biomass pyrolysis, offering promising prospects for sustainable biofuel and bio-based chemical production.
PMID:
42537257
Bibliographic data and abstract were imported from PubMed on 01 Aug 2026.
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