CO2-induced co-pyrolysis of Pennisetum hydridum and waste tires: Multi-objective optimization of its synergies and pyrolytic oil, char and gas outputs

Sen Lin, Liangzhong Li, Zebin Wei, Jiayu Liang, Ziting Lin, Fatih Evrendilek, Yao He, Yoshihiko Ninomiya, Wuming Xie, Shuiyu Sun and Jingyong Liu

Energy, 2025, vol. 317, issue C

Abstract: This study quantified the CO2-induced co-pyrolysis of Pennisetum hydridum (PHY) and waste tires (WT), as well as optimizing synergies and yields of pyrolytic char, oil, and gas to promote sustainable waste co-circularity. High-temperature (>700 °C) CO2-driven co-pyrolysis proved to be a viable waste reduction strategy, reducing residuals by 3.14–16.39 % compared with N2 pyrolysis. The complexity of the co-pyrolysis process was evident in the increased activation energy and reaction order. Synergistic interactions between the feedstocks enhanced the quality of resulting oil and char products. Co-pyrolytic oils exhibited lower oxygenation levels (92.44 %, 75.09 %, and 55.78 %) than PHY oil (92.54 %), with reductions in furans, ketones, and phenols, but with increased hydrocarbon contents (3.66 %, 14.23 %, and 33.31 % for PW31, PW11, and PW13, respectively). The co-pyrolytic chars showed improved pore structure and thermal stability. CO2 facilitated the consumption of furans, decarbonylation of ketones, and aromatization, while promoting the emissions of S- and C-containing gases and HCN, and inhibiting NH3 release. The multi-objective optimization showed that the CO2-induced co-pyrolysis minimized S- and N-containing emissions between 750 and 950 °C. These findings offer insights into achieving harmonious and sustainable co-pyrolysis for energy and product generation.

Keywords: CO2-assisted pyrolysis; Reaction pathway; Pyrolytic oil; Gas emissions; Energy recovery (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:317:y:2025:i:c:s0360544225003123

DOI: 10.1016/j.energy.2025.134670

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