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Plastic Waste Conversion over a Refinery Waste Catalyst.

Ina Vollmer1, Michael J F Jenks1, Rafael Mayorga González1

  • 1Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands.

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Summary

Researchers converted polypropylene plastic waste into valuable aromatics using a fluid catalytic cracking catalyst. An equilibrium catalyst, typically waste, showed reduced plastic coking and similar aromatics production, offering insights for better catalyst design.

Keywords:
Aromaticscoke formationfluid catalytic crackingplastic recyclingpolypropylene

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Catalysis

Background:

  • Polypropylene (PP) constitutes a significant portion of plastic waste.
  • Fluid Catalytic Cracking (FCC) catalysts are primarily used for gasoline production from crude oil.

Purpose of the Study:

  • Investigate the conversion of polypropylene over FCC catalysts.
  • Understand transport limitations of larger polymer molecules compared to traditional feedstocks.
  • Elucidate the roles of FCC catalyst components (matrix and zeolite Y) in polypropylene conversion.

Main Methods:

  • Testing individual components of the FCC catalyst.
  • Utilizing Infrared Spectroscopy (IR) for chemical analysis.
  • Employing Confocal Fluorescence Microscopy for spatial analysis.

Main Results:

  • The FCC matrix plays a key role in aromatization reactions.
  • Zeolite Y domains are primarily responsible for coking.
  • An equilibrium catalyst (ECAT), a waste product, yielded similar aromatics content to fresh FCC catalyst but with significantly reduced coking.
  • ECAT's reduced coking is attributed to decreased accessibility/activity of zeolite domains and enhanced matrix cracking activity from metal deposits.

Conclusions:

  • Mechanistic understanding of PP conversion over FCC catalysts is established.
  • ECAT shows potential for efficient PP conversion with reduced coking.
  • Insights gained can guide the development of improved FCC catalysts for higher aromatics selectivity from plastic waste.