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

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

Renewable Energy, 2023, vol. 215, issue C

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.

Keywords: Municipal sewage sludge; Sludge-based biochar; Catalytic pyrolysis; Kinetics; Mechanism (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:215:y:2023:i:c:s0960148123008613

DOI: 10.1016/j.renene.2023.118955

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