Converting polycarbonate and polystyrene plastic wastes intoaromatic hydrocarbons via catalytic fast co-pyrolysis

Jia Wang, Jianchun Jiang, Xiaobo Wang, Ruizhen Wang, Kui Wang, Shusheng Pang, Zhaoping Zhong, Yunjuan Sun, Roger Ruan, Arthur J. Ragauskas

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Thermochemical conversion of plastic wastes is a promising approach to produce alternative energy-based fuels. Herein, we conducted catalytic fast co-pyrolysis of polycarbonate (PC) and polystyrene (PS) to generate aromatic hydrocarbons using HZSM-5 (Zeolite Socony Mobil-5, hydrogen, Aluminosilicate) as a catalyst. The results indicated that employing HZSM-5 in the catalytic conversion of PC facilitated the synthesis of aromatic hydrocarbons in comparison to the non-catalytic run. A competitive reaction between aromatic hydrocarbons and aromatic oxygenates was observed within the studied temperature region, and catalytic degradation temperature of 700 °C maximized the competing reaction towards the formation of targeted aromatic hydrocarbons at the expense of phenolic products. Catalyst type also played a vital role in the catalytic decomposition of PC wastes, and HZSM-5 with different Si/Al molar ratios produced more aromatic hydrocarbons than HY (Zeolite Y, hydrogen, Faujasite). Regarding the effect of Si/Al molar ration in HZSM-5 on the distribution of monocyclic aromatic hydrocarbons (MAHs), a Si/Al molar ratio of 38 maximized benzene formation with an advanced factor of 5.1. Catalytic fast co-pyrolysis of PC with hydrogen-rich plastic wastes including polypropylene (PP), polyethylene (PE), and polystyrene (PS) favored the production of MAHs, and PS was the most effective hydrogen donor with a ∼2.5-fold increase. The additive effect of MAHs increased at first and then decreased when the PC percentage was elevated from 30 % to 90 %, achieving the maximum value of 32.4 % at 70 % PC.

Original languageEnglish (US)
Article number121970
JournalJournal of Hazardous Materials
Volume386
DOIs
StatePublished - Mar 15 2020

Bibliographical note

Funding Information:
The authors are grateful for the National Natural Science Foundation of China (No. 31530010 , 31870714 ), the Key Lab. of Biomass Energy and Material, Jiangsu Province (No. JSBEM-S-201602 ), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 17KJB610005 ), the Talent Introduction Project Funded by National Forestry and Grassland Administration (No. KJZXSF2019002 ), and a project funded by Nanjing Xiaozhuang University (No. 2016NXY41 ). Appendix A

Funding Information:
The authors are grateful for the National Natural Science Foundation of China (No.31530010, 31870714), the Key Lab. of Biomass Energy and Material, Jiangsu Province (No. JSBEM-S-201602), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 17KJB610005), the Talent Introduction Project Funded by National Forestry and Grassland Administration (No. KJZXSF2019002), and a project funded by Nanjing Xiaozhuang University (No.2016NXY41).

Keywords

  • Bisphenol A polycarbonate
  • Catalytic thermochemical conversion
  • HZSM-5
  • Monocyclic aromatic hydrocarbons
  • Plastic polymers

PubMed: MeSH publication types

  • Journal Article
  • Research Support, Non-U.S. Gov't

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