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Investigation of Catalytic Co-Pyrolysis Characteristics and Synergistic Effect of Oily Sludge and Walnut Shell

Author

Listed:
  • Qinghong Li

    (School of Chemical and Environmental Engineering, Yangtze University, Jingzhou 434023, China)

  • Huan Yang

    (School of Chemical and Environmental Engineering, Yangtze University, Jingzhou 434023, China)

  • Ping Chen

    (Drilling and Production Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 710018, China
    National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi’an 710018, China)

  • Wenxue Jiang

    (Drilling and Production Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 710018, China
    National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi’an 710018, China)

  • Fei Chen

    (CCDC Chuangqing Downhole Technology Company, Xi’an 710018, China)

  • Xiaorong Yu

    (CCDC Chuangqing Downhole Technology Company, Xi’an 710018, China)

  • Gaoshen Su

    (School of Chemical and Environmental Engineering, Yangtze University, Jingzhou 434023, China)

Abstract

The co-pyrolysis of oily sludge and walnut shell is a reliable method for solid waste treatment and waste recycling. In this paper, a thermogravimetric analysis was used to study the thermodynamics and synergy effect of oily sludge (OS) and walnut shell (WS) at four heating rates (10, 20, 30, and 40 °C/min) in the temperature range from 50–850 °C. Two model-free methods (FWO and KAS) were used to calculate the activation energy. The results showed that the heating rate had no significant effect on the pyrolysis process. The addition of walnut shell improved the pyrolysis process of the samples. Mixture 1OS3WS had a synergy effect, while other blends showed an inhibitory effect. The synergy effect of co-pyrolysis was strongest when the mass ratio of oily sludge was 25%. The activation energy of the Zn-ZSM-5/25 catalyst was the lowest, and the residual substances were the least, indicating that the Zn-ZSM-5/25 was beneficial to the co-pyrolysis of oily sludge and walnut shell. The analysis of catalytic pyrolysis products by Py-GC/MS found that co-pyrolysis was beneficial to the generation of aromatic hydrocarbons. This study provided a method for the resource utilization of hazardous waste and biomass waste, which was conducive to the production of aromatic chemicals with added value while reducing environmental pollution.

Suggested Citation

  • Qinghong Li & Huan Yang & Ping Chen & Wenxue Jiang & Fei Chen & Xiaorong Yu & Gaoshen Su, 2023. "Investigation of Catalytic Co-Pyrolysis Characteristics and Synergistic Effect of Oily Sludge and Walnut Shell," IJERPH, MDPI, vol. 20(4), pages 1-12, February.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:4:p:2841-:d:1059063
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    References listed on IDEAS

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    1. Hakimian, Hanie & Pyo, Sumin & Kim, Young-Min & Jae, Jungho & Show, Pau Loke & Rhee, Gwang Hoon & Chen, Wei-Hsin & Park, Young-Kwon, 2022. "Increased aromatics production by co-feeding waste oil sludge to the catalytic pyrolysis of cellulose," Energy, Elsevier, vol. 239(PD).
    2. Xu, Hao & Cheng, Shuo & Hungwe, Douglas & Yoshikawa, Kunio & Takahashi, Fumitake, 2022. "Co-pyrolysis coupled with torrefaction enhances hydrocarbons production from rice straw and oil sludge: The effect of torrefaction on co-pyrolysis synergistic behaviors," Applied Energy, Elsevier, vol. 327(C).
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