Use of steel slag as a catalyst in CO₂: Cofeeding pyrolysis of pine sawdust

Sangyoon LEE, Se-Hwan KIM, Sungyup JUNG, Young-Kwon PARK, Yiu Fai TSANG, Eilhann E. KWON

Research output: Contribution to journalArticles

3 Citations (Scopus)

Abstract

To seek an innovative way for simultaneous waste management and energy recovery, two waste materials (pine sawdust: PSD and steel slag: SS) were used in the pyrolysis process. PSD was used as a carbonaceous material for pyrolysis, and SS was used as a catalyst. Also, to achieve a more sustainable conversion system, a viable use of carbon dioxide (CO₂) as a raw material in the non-catalytic/catalytic pyrolysis process was evaluated. Hence, the present study laid great stress on the CO₂ effects. The present study pointed the optimistic technical features in line with the use of CO₂ in the pyrolysis process. Exploiting CO₂ in pyrolysis of PSD offered a strategic way to control carbon reallocation from liquid to gaseous pyrolysates by the gas phase reactions (GPRs). The reactions of CO₂ and volatile pyrolysates led to CO enhancement, which was only observed at ≥ 600 °C due to the slow reaction kinetics of the GPRs of volatile pyrolysates and CO₂. Such the slow reaction kinetics was expedited remarkably when SS was acted as a catalyst. Moreover, CO₂ expedited thermal cracking of volatile pyrolysates including dehydrogenation, which led to the enhanced formation of CH₄ and H₂. Copyright © 2020 Elsevier B.V. All rights reserved.
Original languageEnglish
Article number122275
JournalJournal of Hazardous Materials
Volume392
Early online dateFeb 2020
DOIs
Publication statusPublished - Jun 2020

Citation

Lee, S., Kim, S.-H., Jung, S., Park, Y.-K., Tsang, Y. F., & Kwon, E. E. (2020). Use of steel slag as a catalyst in CO₂: Cofeeding pyrolysis of pine sawdust. Journal of Hazardous Materials, 392. Retrieved from https://doi.org/10.1016/j.jhazmat.2020.122275

Keywords

  • Lignocellulosic biomass
  • Catalytic pyrolysis
  • Carbon dioxide
  • Steel slag
  • Waste-to-energy

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