Controlling the compositional matrix of pyrogenic products using carbon dioxide in the pyrolysis of agricultural plastic waste

Dong Jun LEE, Jonghyun PARK, Jee Young KIM, Sungyup JUNG, Ye Bin CHOI, Soyeon PARK, Siyoung SEO, Yiu Fai TSANG, Eilhann E. KWON

Research output: Contribution to journalArticlespeer-review

Abstract

Plastics are extensively employed in agriculture, generating an enormous volume of plastic waste. This study investigated the pyrolysis of silage film waste (SFW) to enable its conversion into energy/value-added chemicals. CO was chosen as the reactive medium to provide green pyrolysis. Nevertheless, the results showed that most of the carbon in the SFW was assigned to wax-like oil formed by thermal cracking. It was presumed that the reactivity of CO was effective only under certain optimal temperature conditions. To this end, the test setup was modified to increase the residence time of the reactants (CO and volatiles from SFW). With respect to inert gas conditions, syngas formation was observed under CO conditions. The enhanced formation of syngas was realised by the simultaneous reduction of CO into CO and the oxidation of volatiles into CO. CO also enhances the thermal cracking of volatiles, leading to enhanced formation of C-hydrocarbons. These features provide an effective means of decreasing the aromaticity of oil from SFW pyrolysis. The simultaneous reduction of CO into CO and oxidation of volatiles into CO block the mechanistic pathway to form polycyclic aromatic hydrocarbons. CO enhancement by CO offers an effective means for abating the fate of toxic chemicals. Copyright © 2024 Elsevier B.V. All rights reserved.

Original languageEnglish
Article number148968
JournalChemical Engineering Journal
Volume482
Early online dateJan 2024
DOIs
Publication statusPublished - Feb 2024

Citation

Lee, D.-J., Park, J., Kim, J. Y., Jung, S., Choi, Y.-B., Park, S., Seo, S., Tsang, Y. F., & Kwon, E. E. (2024). Controlling the compositional matrix of pyrogenic products using carbon dioxide in the pyrolysis of agricultural plastic waste. Chemical Engineering Journal, 482, Article 148968. https://doi.org/10.1016/j.cej.2024.148968

Keywords

  • Waste valorisation
  • Waste-to-energy
  • Agricultural plastic waste
  • Pyrolysis
  • Polycyclic aromatic hydrocarbon (PAH)

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