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Co-pyrolysis of corn stalk and polyethylene at a gas phase contacting mode and aromatization mechanism study

Author

Listed:
  • Liu, Jiaomei
  • Huang, Fanfan
  • Wu, Liu
  • Chen, Lanxin
  • Wang, Jingyue
  • Liang, Jie

Abstract

The co-pyrolysis of “hydrogen-deficient” biomass and plastics is an efficient method to produce aromatic-rich bio-oils. However, the distinct pyrolysis characteristics and complex interactions between biomass and plastics in conventional reactors limited aromatics production and synergy study. A modified Y-shaped tube reactor was therefore established, in which corn straw and high-density polyethylene (HDPE) were placed in two branches respectively, with a co-pyrolysis ZSM-5 catalyst at the junction for co-pyrolysis. Firstly, optimal pyrolysis conditions (temperature, catalyst-to-feedstock ratio) were studied for each feedstock to boost furans/light olefins production. As a result, the Diels-Alder reaction raised the aromatics to 21.7 area% in non-catalytic trial. The addition of co-pyrolysis ZSM-5(60) further strengthened this reaction and doubled aromatics to 44.8 area%. It is noteworthy that even with the same catalyst (ZSM-5(60)), the gas-phase contact mode outperformed the conventional co-pyrolysis mode (39.4 area%) in aromatic generation. Subsequently, the synergy between HDPE and cellulose/hemicellulose/lignin was respectively investigated. Results showed that the Diels-Alder reaction between furans and light olefins contributed most to aromatics production, followed by the aromatization of HDPE-derived light olefins.

Suggested Citation

  • Liu, Jiaomei & Huang, Fanfan & Wu, Liu & Chen, Lanxin & Wang, Jingyue & Liang, Jie, 2025. "Co-pyrolysis of corn stalk and polyethylene at a gas phase contacting mode and aromatization mechanism study," Energy, Elsevier, vol. 319(C).
    • Handle: RePEc:eee:energy:v:319:y:2025:i:c:s0360544225006619
    DOI: 10.1016/j.energy.2025.135019
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