Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Kinetic Analysis for the Catalytic Pyrolysis of Polyethylene Terephthalate Over Cost Effective Natural Catalysts

  • Pyo, Sumin (School of Environmental Engineering, University of Seoul) ;
  • Hakimian, Hanie (School of Environmental Engineering, University of Seoul) ;
  • Kim, Young-Min (Department of Environmental Engineering, Daegu University) ;
  • Yoo, Kyung-Seun (Department of Environmental Engineering, Kwangwoon University) ;
  • Park, Young-Kwon (School of Environmental Engineering, University of Seoul)
  • Received : 2021.10.14
  • Accepted : 2021.11.09
  • Published : 2021.12.10
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Abstract

In the current research, thermal and catalytic thermogravimetric (TG) analysis of polyethylene terephthalate (PET) over natural zeolite (NZ), olivine, bentonite, HZSM-5, and HAl-MCM-41 were investigated using a TG analyzer and model-free kinetic analysis. Catalytic TG analysis of PET was carried out at multi-heating rates, 10, 20, 30, and 40 ℃/min, under nitrogen atmosphere. Apparent activation energy (Ea) values for the thermal and catalytic pyrolysis of PET were calculated using Flynn-Wall-Ozawa method. Although natural catalysts, NZ, olivine, and bentonite, could not lead the higher PET decomposition efficiency than synthetic zeolites, HZSM-5 and HAl-MCM-41, maximum decomposition temperatures on the differential TG (DTG) curves for the catalytic pyrolysis of PET, 436 ℃ over olivine, 435 ℃ over bentonite, and 434 ℃ over NZ, at 10 ℃/min, were definitely lower than non-catalytic pyrolysis. Calculated Ea values for the catalytic pyrolysis of PET over natural catalysts, 177 kJ/mol over olivine, 168 kJ/mol over bentonite, and 171 kJ/mol over NZ, were also not lower than those over synthetic zeolites, however, those were also much lower than the thermal decomposition, suggesting their feasibility as the proper and cost-effective catalysts on the pyrolysis of PET.

Keywords

Acknowledgement

Kyung-Seun Yoo acknowledges support by Basic Science Research Program through the NationalResearch Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2019R1F1A1061554). Young-Kwon Park acknowledges support through the Technology Innovation Program (20015401) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This work was also supported by Korea Environment Industry & Technology Institute (KEITI) through Post Plastic, a specialized program of the Graduate School funded by Korea Ministry of Environment (MOE).

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