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Zeolite Supported Pt for Depolymerization of Polyethylene by Induction Heating.

Bernard Whajah1, Joseph N Heil2, Cameron L Roman1

  • 1Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States.

Industrial & Engineering Chemistry Research
|June 12, 2023
PubMed
Summary

Induction heating (IH) with bifunctional catalysts efficiently depolymerizes polyethylene into valuable hydrocarbons. This method achieves high yields at low temperatures, offering tunable products without methane or coke.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Catalysis

Background:

  • Polyethylene depolymerization is crucial for plastic recycling.
  • Conventional thermal methods face challenges like low efficiency and product selectivity.

Purpose of the Study:

  • To investigate induction heating (IH) for polyethylene depolymerization using bifunctional hydrocracking catalysts.
  • To explore the influence of zeolite support structure on product distribution.
  • To optimize reaction conditions for high hydrocarbon yields and selectivity.

Main Methods:

  • Utilized induction heating (IH) for polyethylene depolymerization.
  • Employed bifunctional hydrocracking catalysts containing platinum (Pt) or platinum-tin (Pt-Sn) on various zeolite supports (MFI, LTL, CHA(SSZ-13), TON).
  • Analyzed hydrocarbon product distribution and yield under atmospheric pressure without H2.

Main Results:

  • Achieved high hydrocarbon product yields (up to 95 wt %) within 2 hours at 375 °C.
  • Demonstrated tunable product distribution from light gases to gasoline and diesel ranges.
  • Observed minimal formation of methane, aromatics, and coke.
  • Showcased IH's ability to overcome diffusional limitations, reducing reaction times.

Conclusions:

  • Induction heating (IH) offers an efficient and rapid method for polyethylene depolymerization.
  • Bifunctional catalysts on tailored zeolite supports enable selective hydrocarbon production.
  • This approach presents a promising pathway for sustainable plastic waste valorization.