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Investigating kinetic behavior and reaction mechanism on autothermal pyrolysis of polyethylene plastic

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  • Xie, Wen
  • Su, Jing
  • Zhang, Xiangkun
  • Li, Tan
  • Wang, Cong
  • Yuan, Xiangzhou
  • Wang, Kaige

Abstract

To reduce the energy supply for pyrolysis, autothermal pyrolysis is one of the most promising approaches to upcycle plastic waste. In this work, both single-step and multi-step methods were applied to perform kinetic studies of low-density polyethylene (LDPE) pyrolysis under oxidative atmospheres (0, 5, and 10% O2 balanced by N2) by changing the heating rate from 5 to 20 K min−1. Miura integral method was then used to estimate the apparent activation energy. The major findings showed that the multi-step method using asymmetric double sigmoidal (Asym2Sig) deconvolution procedure was more appropriate to study kinetic behaviors of LDPE autothermal pyrolysis. The activation energy needed for LDPE pyrolysis under N2 was 271 kJ·mol−1, while the activation energies of the three pseudo-reactions under 5% O2 were 71, 153 and 189 kJ·mol−1, and under 10% O2 were 74, 224 and 169 kJ·mol−1, indicating that LDPE autothermal pyrolysis was more energy-saving than conventional LDPE pyrolysis. Additionally, the reaction mechanism was proposed to provide an accurate and critical guideline for commercializing this novel technical route, which is beneficial to achieving sustainable plastic waste management and mitigating plastic pollution, simultaneously.

Suggested Citation

  • Xie, Wen & Su, Jing & Zhang, Xiangkun & Li, Tan & Wang, Cong & Yuan, Xiangzhou & Wang, Kaige, 2023. "Investigating kinetic behavior and reaction mechanism on autothermal pyrolysis of polyethylene plastic," Energy, Elsevier, vol. 269(C).
  • Handle: RePEc:eee:energy:v:269:y:2023:i:c:s0360544223002116
    DOI: 10.1016/j.energy.2023.126817
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    2. Żukowski, Witold & Berkowicz-Płatek, Gabriela & Wrona, Jan, 2024. "Thermal decomposition of polyolefins under different oxygen content. Kinetic parameters evaluation," Energy, Elsevier, vol. 293(C).
    3. Yang, Youwei & Pan, Ruming & Wu, Yibo & Pan, Qinghui & Shuai, Yong, 2024. "A porous media catalyst for waste polyethylene pyrolysis in a continuous feeding reactor," Energy, Elsevier, vol. 302(C).
    4. Berkowicz-Płatek, Gabriela & Żukowski, Witold & Wrona, Jan & Wencel, Kinga, 2024. "Thermal decomposition of polyolefins under different oxygen content. Composition of products and thermal effects," Energy, Elsevier, vol. 295(C).
    5. Skvorčinskienė, R. & Kiminaitė, I. & Vorotinskienė, L. & Jančauskas, A. & Paulauskas, R., 2023. "Complex study of bioplastics: Degradation in soil and characterization by FTIR-ATR and FTIR-TGA methods," Energy, Elsevier, vol. 274(C).

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