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Municipal sewage sludge product recirculation catalytic pyrolysis mechanism from a kinetic perspective

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  • Ma, Mingyan
  • Xu, Donghai
  • Gong, Xuehan
  • Diao, Yunfei
  • Feng, Peng
  • Kapusta, Krzysztof

Abstract

Using biochar derived from municipal sewage sludge (MSS) pyrolysis as a catalytic pyrolysis catalyst can not only achieve product recycling but also enhance conversion rate. In this study, the kinetics of MSS product recirculation catalytic pyrolysis were investigated based on non-isothermal thermogravimetric experiments. The results demonstrate that MSS noncatalytic/catalytic pyrolysis reaction involves five stages, with the main decomposition occurring between 180 and 680 °C and accounting for 53.14%–69.75% of the total mass loss. 20%-cata and 30%-cata reduced the average activation energy by 24.14% and 44.73% for the noncatalytic pyrolysis of MSS, respectively, and the catalytic effect of sludge-based biochar (S–C) allowed the appearance of the lowest activation energy earlier. MSS noncatalytic pyrolysis follows a kinetic mechanism of random nucleation and nucleation growth, whereas exponential nucleation predominate in catalytic pyrolysis. The catalysis mainly operates on macromolecular fracture breakdown and tar secondary cracking. Moreover, a plausible catalytic mechanism for MSS product recirculation catalytic pyrolysis was proposed. The results are expected to be useful in the design of efficient pyrolysis systems.

Suggested Citation

  • Ma, Mingyan & Xu, Donghai & Gong, Xuehan & Diao, Yunfei & Feng, Peng & Kapusta, Krzysztof, 2023. "Municipal sewage sludge product recirculation catalytic pyrolysis mechanism from a kinetic perspective," Renewable Energy, Elsevier, vol. 215(C).
    • Handle: RePEc:eee:renene:v:215:y:2023:i:c:s0960148123008613
    DOI: 10.1016/j.renene.2023.118955
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    References listed on IDEAS

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    1. El Farissi, Hammadi & Talhaoui, Abdelmonaem & EL Bachiri, Ali, 2023. "Cistus shells used as a sustainable matrix for bioenergy production through slow pyrolysis process: Kinetic and thermodynamic study," Renewable Energy, Elsevier, vol. 218(C).

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