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Kinetic Analysis for the Catalytic Pyrolysis of Polypropylene over Low Cost Mineral Catalysts

Author

Listed:
  • Young-Min Kim

    (Department of Environmental Engineering, Daegu University, Gyeongsan 38453, Korea
    Equal contributed co-first authors.)

  • Sumin Pyo

    (School of Environmental Engineering, University of Seoul, Seoul 02504, Korea
    Equal contributed co-first authors.)

  • Hanie Hakimian

    (School of Environmental Engineering, University of Seoul, Seoul 02504, Korea
    Equal contributed co-first authors.)

  • Kyung-Seun Yoo

    (Department of Environmental Engineering, Kwanwoon University, Seoul 01897, Korea
    Equal contributed co-first authors.)

  • Gwang-Hoon Rhee

    (Department of Mechanical and Information Engineering, University of Seoul, Seoul 02504, Korea)

  • Young-Kwon Park

    (School of Environmental Engineering, University of Seoul, Seoul 02504, Korea)

Abstract

A kinetic analysis of non-catalytic pyrolysis (NCP) and catalytic pyrolysis (CP) of polypropylene (PP) with different catalysts was performed using thermogravimetric analysis (TGA) and kinetic models. Three kinds of low-cost natural catalysts were used to maximize the cost-effectiveness of the process: natural zeolite (NZ), bentonite, olivine, and a mesoporous catalyst, Al-MCM-41. The decomposition temperature of PP and apparent activation energy (Ea) were obtained from the TGA results at multiple heating rates, and a model-free kinetic analysis was performed using the Flynn–Wall–Ozawa model. TGA indicated that the maximum decomposition temperature (T max ) of the PP was shifted from 464 °C to 347 °C with Al-MCM-41 and 348 °C with bentonite, largely due to their strong acidity and large pore size. Although olivine had a large pore size, the T max of PP was only shifted to 456 °C, because of its low acidity. The differential TG (DTG) curve of PP over NZ revealed a two-step mechanism. The T max of the first peak on the DTG curve of PP with NZ was 376 °C due to the high acidity of NZ. On the other hand, that of the second peak was higher (474 °C) than the non-catalytic reaction. The Ea values at each conversion were also decreased when using the catalysts, except olivine. At <0.5 conversion, the Ea obtained from the CP of PP with NZ was lower than that with the other catalysts: Al-MCM-41, bentonite, and olivine, in that order. The Ea for the CP of PP with NZ increased more rapidly, to 193 kJ/mol at 0.9 conversion, than the other catalysts.

Suggested Citation

  • Young-Min Kim & Sumin Pyo & Hanie Hakimian & Kyung-Seun Yoo & Gwang-Hoon Rhee & Young-Kwon Park, 2021. "Kinetic Analysis for the Catalytic Pyrolysis of Polypropylene over Low Cost Mineral Catalysts," Sustainability, MDPI, vol. 13(23), pages 1-10, December.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:23:p:13386-:d:694151
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    References listed on IDEAS

    as
    1. Lee, Hyung Won & Choi, Suek Joo & Jeon, Jong-Ki & Park, Sung Hoon & Jung, Sang-Chul & Park, Young-Kwon, 2015. "Catalytic conversion of waste particle board and polypropylene over H-beta and HY zeolites," Renewable Energy, Elsevier, vol. 79(C), pages 9-13.
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