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Effect of microwave pretreatment on pyrolysis of chili straw: thermodynamics, activation energy, and solid reaction mechanism

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Abstract

In this work, chili straw (CS) was pretreated by microwave at 250 W, 406 W, 567 W, and 700 W. The pyrolysis characteristics, kinetics, thermodynamic parameters, and solid reaction mechanism were investigated. The maximum weight loss rate increases from  – 24.72%/°C at P0 to  – 28.01%/°C at P700 after microwave pretreatment, and the residual mass decreases from 31.81 at P0 to 26.71% at P700. In addition, microwave pretreatment leads to a decrease in activation energy, ∆H, and ∆G at the end of the pyrolysis (α > 0.7). The solid reaction mechanism of CS pyrolysis is revealed by the Z-master plots method, with un-pretreated CS conforming to P2, D4, F3/2, and F3, respectively. Microwave pretreatment changes the solid reaction mechanism mainly in the third stage, when α = 0.8, the mechanism function changes from f(α) = (1 – α)3 at P0 to f(α) = (1 – α) at P700, and the number of reaction order is reduced, which is profitable for CS pyrolysis.

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Funding

This work was supported by the National Natural Science Foundation of China (22373035), the Key Technologies Research and Development Program of Guangzhou (202206010122), and the CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion (E229kf0201).

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Authors and Affiliations

  1. School of Electric Power, South China University of Technology, Guangzhou, 510640, China

    Xikui Zhang, Xiaoqian Ma, Zhaosheng Yu & Gao Shen

  2. Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, Guangzhou, 510640, China

    Xikui Zhang, Xiaoqian Ma, Zhaosheng Yu & Gao Shen

Authors
  1. Xikui Zhang
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  2. Xiaoqian Ma
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  3. Zhaosheng Yu
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  4. Gao Shen
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Contributions

All authors contributed to the study conception and design. Xikui Zhang: writing—original draft, visualization, investigation, formal analysis. Xiaoqian Ma: funding acquisition, project administration, supervision, methodology. Zhaosheng Yu: conceptualization, methodology, resources, writing—review and editing. Gao Shen: data curation, validation, writing—review and editing.

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Correspondence to Xiaoqian Ma.

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Zhang, X., Ma, X., Yu, Z. et al. Effect of microwave pretreatment on pyrolysis of chili straw: thermodynamics, activation energy, and solid reaction mechanism. Environ Sci Pollut Res 31, 15759–15769 (2024). https://doi.org/10.1007/s11356-024-32244-x

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