SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2025, Vol. 81 ›› Issue (5): 128-141.DOI: 10.1016/j.cjche.2025.02.021

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An experimental study into the pyrolysis characteristics of waste tire rubber with catalyst addition

Xuanyu Ji1,2, Hanyu Liu1, Junting Chen1, Xiong Zhou1,3, Jianbo Li2, Lu Yang1,3, Weijian Lin1, Ning Chen1   

  1. 1. Chongqing University of Science and Technology, Chongqing 401331, China;
    2. Chongqing University, Chongqing 400044, China;
    3. The Provincial and Ministerial Collaborative Innovation Center for Domestic Garbage Resource Treatment, Chongqing 4001331, China
  • Received:2024-03-17 Revised:2025-01-27 Accepted:2025-02-24 Online:2025-03-20 Published:2025-05-28
  • Contact: Xuanyu Ji,E-mail:jixuanyu@sina.com
  • Supported by:
    The authors would like to acknowledge for the financial supports from the Chongqing Municipal Education Commission Research Project (KJZD-K202401502) and Chongqing Municipal Science & Technology Commission Research Project (CSTB2022NSCQ-LZX0071) to the research work.

An experimental study into the pyrolysis characteristics of waste tire rubber with catalyst addition

Xuanyu Ji1,2, Hanyu Liu1, Junting Chen1, Xiong Zhou1,3, Jianbo Li2, Lu Yang1,3, Weijian Lin1, Ning Chen1   

  1. 1. Chongqing University of Science and Technology, Chongqing 401331, China;
    2. Chongqing University, Chongqing 400044, China;
    3. The Provincial and Ministerial Collaborative Innovation Center for Domestic Garbage Resource Treatment, Chongqing 4001331, China
  • 通讯作者: Xuanyu Ji,E-mail:jixuanyu@sina.com
  • 基金资助:
    The authors would like to acknowledge for the financial supports from the Chongqing Municipal Education Commission Research Project (KJZD-K202401502) and Chongqing Municipal Science & Technology Commission Research Project (CSTB2022NSCQ-LZX0071) to the research work.

Abstract: In this paper, the pyrolysis characteristics of waste tire rubber with catalyst addition were experimentally studied. Pyrolysis experimentations of waste tire rubber with either base, acid or Zeolite catalysts were performed in a Thermal Gravimetric Analyzer, a one-stage test rig and a two-stage test rig respectively. This is followed by analysis into the rates of pyrolysis reactions and the yields and distribution of the three-phase products using thermogravimetric infrared spectroscopy (TG-IR) and gas chromatography-mass spectrometry (GC-MS). Results indicated that the transition metal chloride catalysts improved the reaction rate and were overall effective than the solid acid-base catalysts. Benzene and toluene yields were improved by all three catalysts in the primary pyrolysis, and the best performance was achieved at 550 °C and 600 °C with 30% NaOH. With ZSM-5 in the secondary pyrolysis, proportion of high calorific gases components as H2 and CH4 were increased, and the arylation and isomerization reactions were also promoted. The optimum aromatics yield was achieved at 600 °C and 50% ZSM condition. This study would provide a reference for resourceful utilization of waste tires.

Key words: Waste tires, Catalytic pyrolysis, High-value products, Pollutants emission

摘要: In this paper, the pyrolysis characteristics of waste tire rubber with catalyst addition were experimentally studied. Pyrolysis experimentations of waste tire rubber with either base, acid or Zeolite catalysts were performed in a Thermal Gravimetric Analyzer, a one-stage test rig and a two-stage test rig respectively. This is followed by analysis into the rates of pyrolysis reactions and the yields and distribution of the three-phase products using thermogravimetric infrared spectroscopy (TG-IR) and gas chromatography-mass spectrometry (GC-MS). Results indicated that the transition metal chloride catalysts improved the reaction rate and were overall effective than the solid acid-base catalysts. Benzene and toluene yields were improved by all three catalysts in the primary pyrolysis, and the best performance was achieved at 550 °C and 600 °C with 30% NaOH. With ZSM-5 in the secondary pyrolysis, proportion of high calorific gases components as H2 and CH4 were increased, and the arylation and isomerization reactions were also promoted. The optimum aromatics yield was achieved at 600 °C and 50% ZSM condition. This study would provide a reference for resourceful utilization of waste tires.

关键词: Waste tires, Catalytic pyrolysis, High-value products, Pollutants emission