Synergistic effects of CO₂ on ex situ catalytic pyrolysis of lignocellulosic biomass over a Ni/SiO₂ catalyst

Seong-Heon CHO, Sungyup JUNG, Young-Kwon PARK, Yiu Fai TSANG, Changkook RYU, Eilhann E. KWON

Research output: Contribution to journalArticles

Abstract

This work laid emphasis on catalytic pyrolysis of Styrax japonicus to construct a biomass-to-energy conversion platform. CO₂ was particularly chosen to enhance the catalytic pyrolysis of the biomass waste, in reference to N₂-purged pyrolysis. The specific roles of CO₂ on pyrolysis of S. japonicus in line with synergistic effect of Ni-based catalysts was investigated. It was shown that CO₂ played as an oxidant for CO formation via homogeneous gas phase reaction of CO₂ with volatile organic carbons (VOCs) liberated from the thermolysis of S. japonicus. Ni/SiO₂ catalyst expedited dehydrogenation (DH) of the VOCs, resulting in significant H₂ generation and alteration of aromaticity in VOCs. Each CO₂ and Ni catalyst independently enhanced CO and H₂ formation, respectively, and their synergistic effects were shown at ≥ 600 °C. Coke deposition on the Ni/SiO₂ catalyst was confirmed after catalytic pyrolysis, while the suppression of coke formation on the catalyst surface was achieved under the CO₂ environment. Copyright © 2020 Elsevier Ltd. All rights reserved.
Original languageEnglish
Article number101182
JournalJournal of CO2 Utilization
Early online dateMay 2020
DOIs
Publication statusE-pub ahead of print - May 2020

Citation

Cho, S.-H., Jung, S., Park, Y.-K., Tsang, Y. F., Ryu, C., & Kwon, E. E. (2020). Synergistic effects of CO₂ on ex situ catalytic pyrolysis of lignocellulosic biomass over a Ni/SiO₂ catalyst. Journal of CO2 Utilization. Advance online publication. doi: 10.1016/j.jcou.2020.101182

Keywords

  • Catalytic pyrolysis
  • Carbon dioxide
  • Waste-to-energy
  • CO₂-to-fuel
  • Biomass valorization
  • Hydrogen

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