CO₂-mediated catalytic pyrolysis of cigarette filters over Co/SiO₂

Youkwan KIM, Seong Heon CHO, Sangyoon LEE, Yiu Fai TSANG, Young Min Kim, Wei Hsin CHEN, Sungyup JUNG, Eilhann E. KWON

Research output: Contribution to journalArticlespeer-review


Improper disposal of cigarette butts (CBs) has posed a hazardous risk due to inevitable releases of toxic chemicals and microplastics into our ecosystem. As a precautious measure, this study carried out to develop an eco-friendly disposal platform for CBs. As such, cigarette filter (CF) and E-cigarette filter (ECF) were thermally degraded (pyrolyzed) using greenhouse gas (CO₂) as a co-feedstock. Before pyrolysis studies, a hazardous potential of CF and ECF was qualitatively and quantitatively assessed. From the pyrolysis tests, it was observed that toxic chemicals in CF and ECF were thermally degraded/transformed into the non-toxic pyrogenic products. The enhanced thermolyses of CF and ECF were further realized in the presence of CO2. Catalytic pyrolyses over Co/SiO₂ were also done to further promote their thermal decomposition. The enhanced mechanistic functionality of CO₂ imparted by the catalytic capability of Co/SiO₂ directly led to additional syngas formation (up to 50 %). The beneficial features were originated from the homogeneous reactions of CO₂ and volatile toxic chemicals stemming from CF and ECF over Co catalyst. Thus, all findings in this work highlighted that the CO₂-supported catalytic pyrolysis could be a reliable/practical disposal platform for CBs. Copyright © 2024 Elsevier Ltd. All rights reserved.

Original languageEnglish
Article number141039
JournalJournal of Cleaner Production
Early online dateFeb 2024
Publication statusPublished - Feb 2024


Kim, Y., Cho, S.-H., Lee, S., Tsang, Y.-F., Kim, Y.-M., Chen, W.-H., Jung, S., & Kwon, E. E. (2024). CO₂-mediated catalytic pyrolysis of cigarette filters over Co/SiO₂. Journal of Cleaner Production, 441, Article 141039.


  • Waste management
  • Cigarette waste
  • Carbon dioxide
  • Catalytic pyrolysis
  • Syngas


Dive into the research topics of 'CO₂-mediated catalytic pyrolysis of cigarette filters over Co/SiO₂'. Together they form a unique fingerprint.