Conversion of low-density polyethylene into monocyclic aromatic hydrocarbons by catalytic pyrolysis: Comparison of HZSM-5, Hβ, HY and MCM-41

Xiaojie Tian, Zihong Zeng, Zhihao Liu, Leilei Dai, Jiamin Xu, Xiuhua Yang, Linqing Yue, Yuhuan Liu, Roger Ruan, Yunpu Wang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The catalytic properties of different catalytic materials on the pyrolysis of plastics have been extensively investigated. In order to better understand the relevant mechanism of catalytic pyrolysis of plastic waste, the effect of different acidity and pore size of catalytic material on its pyrolysis kinetic parameters and the distribution of pyrolysis products needs to be studied to provide a stronger theoretical basis for its resource utilization. This study aims to study the effects of HZSM-5, Hβ, HY and MCM-41 on the thermodynamic properties, kinetic parameters and pyrolysis characteristics of low-density polyethylene (LDPE), analyze the relationship between the specific catalytic pyrolysis products and the properties of the catalyst. Among the four catalysts, HZSM-5 obtained the most concentrated product distribution and the highest yield of monocyclic aromatic hydrocarbons, and it was found that the cracking of LDPE mainly occurred in its pores. Due to the large pore size and low concentration of acid sites, the main product type obtained by MCM-41 was olefins. In addition, it was found that HY reduced the pyrolysis temperature of LDPE and the activation energy of the reaction to the greatest extent. The different catalytic effects were mainly caused by different pore structures and acid site concentration. Moreover, it was found that the addition of catalyst changed the cracking mechanism of LDPE. Under the comprehensive consideration with the goal of producing monocyclic aromatic hydrocarbons, HZSM-5 is the most suitable catalyst among them.

Original languageEnglish (US)
Article number131989
JournalJournal of Cleaner Production
Volume358
DOIs
StatePublished - Jul 15 2022

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 52166015 ; No. 22166026 ), The Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province ( 20204BCJ23011 ), The Natural Science Foundation of Jiangxi Province ( 20212ACB215007 ), The Centrally Guided Local Science Technology Special Project ( 20202ZDB01012 ).

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

  • Catalysis
  • Low-density polyethylene
  • Mesoporous material
  • Monocyclic aromatic hydrocarbons
  • Pyrolysis
  • Zeolites

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