Insights into structure–performance relationship in the catalytic cracking of high density polyethylene

Leilei Dai, Nan Zhou, Kirk Cobb, Paul Chen, Yunpu Wang, Yuhuan Liu, Rongge Zou, Hanwu Lei, Badr A. Mohamed, Yanling Cheng, Roger Ruan

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Zeolite is considered a promising catalyst for plastic cracking because of its well-defined acid sites, high product selectivity, and outstanding stability. The relationship between zeolite structure and catalytic performance is still not well understood. Therefore, on either as prepared or purposely modified ZSM-5 zeolites, we made a systematic investigation of how acid density and pore structure affect catalytic performance in this work. Our results demonstrate that Brønsted acid site density had profound impact on the catalyst lifetime and aromatic selectivity. The relationship between Brønsted acid site density and catalyst lifetime displays a tendency that catalyst lifetime declines with acid site density at the beginning, then rises up, instead of a linear correlation. Also, the increase of mesoporosity extends the catalyst lifetime to some extent. This information can give us a better understanding of how to design higher-performance catalysts for chemical upcycling of waste plastics.

Original languageEnglish (US)
Article number121835
JournalApplied Catalysis B: Environmental
StatePublished - Dec 5 2022

Bibliographical note

Funding Information:
We acknowledge the financial support from Xcel Energy , Resynergi , the University of Minnesota MnDrive Environment Program MNE12 , China Scholarship Council (CSC), and the University of Minnesota Center for Biorefining . Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program.

Publisher Copyright:
© 2022 Elsevier B.V.


  • Brønsted acid site
  • Catalyst lifetime
  • Plastics
  • Pore structure
  • ZSM-5


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