Catalytic fast pyrolysis of low density polyethylene into naphtha with high selectivity by dual-catalyst tandem catalysis

Leilei Dai, Nan Zhou, Hui Li, Yunpu Wang, Yuhuan Liu, Kirk Cobb, Yanling Cheng, Hanwu Lei, Paul Chen, Roger Ruan

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this work, catalytic fast pyrolysis of low density polyethylene (LDPE) into highly valuable naphtha by the relay catalysis (Al2O3 followed by ZSM-5 zeolite) was conducted. Effects of different catalysts, pyrolysis temperatures, catalyst to plastic ratio, and Al2O3 to ZSM-5 ratio, on product distribution and selectivity were studied. Al2O3 shows an excellent performance for catalytic reforming of LDPE pyrolysis vapors, mainly producing C5-C23 olefins that are the important precursors to form aromatics via Diels-Alder, aromatization, and polymerization reactions in the pores of ZSM-5 catalyst. Experimental results also show that the selectivity of monoaromatics and C5-C12 alkanes/olefins can be up to 100% over Al2O3 followed by ZSM-5 relay catalysis at the temperature of 550 °C, the catalyst to plastic ratio of 4:1, and Al2O3 to ZSM-5 ratio of 1:1. The product (monoaromatics and C5-C12 alkanes/olefins), naphtha, could be a renewable feedstock for new plastic production in the petroleum industry so that this finding might provide a new insight for a circular economy.

Original languageEnglish (US)
Article number144995
JournalScience of the Total Environment
Volume771
DOIs
StatePublished - Jun 1 2021

Bibliographical note

Funding Information:
We acknowledge the financial support from National Natural Science Foundation of China (No. 21766019 , 21878137 ), Natural Science Foundation of Jiangxi Province , China ( 20181BAB206030 ), China Scholarship Council (CSC), Xcel Energy , and University of Minnesota Center for Biorefining .

Funding Information:
We acknowledge the financial support from National Natural Science Foundation of China (No. 21766019, 21878137), Natural Science Foundation of Jiangxi Province, China (20181BAB206030), China Scholarship Council (CSC), Xcel Energy, and University of Minnesota Center for Biorefining.

Publisher Copyright:
© 2021 Elsevier B.V.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • AlO
  • Catalytic pyrolysis
  • Naphtha
  • Polyethylene
  • ZSM-5 zeolite

Fingerprint Dive into the research topics of 'Catalytic fast pyrolysis of low density polyethylene into naphtha with high selectivity by dual-catalyst tandem catalysis'. Together they form a unique fingerprint.

Cite this