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Towards understanding the chemical reactions between KOH and oxygen-containing groups during KOH-catalyzed pyrolysis of biomass

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  • Hu, Mian
  • Ye, Zhiheng
  • Zhang, Qi
  • Xue, Qiping
  • Li, Zhibin
  • Wang, Junliang
  • Pan, Zhiyan

Abstract

In this study, the effect of KOH/biomass ratios and pyrolysis temperatures on products distribution, the evolution of oxygen-containing groups in pyrolytic tri-state products and the possible chemical reactions between oxygen-containing groups and KOH were investigated. The results indicated that KOH can react with oxygen-containing groups in biomass to facilitate gas generation at lower ratios (≤1:2) or higher temperature (∼800 °C). When at higher ratios (>1:2) and 600 °C, KOH has an inhibitory effect on gas production. With a significant decreased in the oxygen-containing species and acids, the phenols and hydrocarbons became the main species in bio-oil. Moreover, KOH facilitates methoxyphenol conversion and has high selectivity for alkyl phenol generation. For biochar, at lower ratios (<1:2), K can attack the oxygen sites of phenolic hydroxyl groups, forming dangling bonds and promoting the formation of aromatic rings with anhydride groups. However, at higher ratios (>1:2), the oxygen-containing groups on the surface of biochar gradually changed from anhydride groups to quinone groups, and finally form a biochar with large aromatic ring and rich in quinone groups. As analyzed above, a possible chemical reaction between KOH and oxygen-containing groups during KOH-catalyzed pyrolysis of biomass was proposed.

Suggested Citation

  • Hu, Mian & Ye, Zhiheng & Zhang, Qi & Xue, Qiping & Li, Zhibin & Wang, Junliang & Pan, Zhiyan, 2022. "Towards understanding the chemical reactions between KOH and oxygen-containing groups during KOH-catalyzed pyrolysis of biomass," Energy, Elsevier, vol. 245(C).
    • Handle: RePEc:eee:energy:v:245:y:2022:i:c:s036054422200189x
    DOI: 10.1016/j.energy.2022.123286
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    2. Bartłomiej Igliński & Wojciech Kujawski & Urszula Kiełkowska, 2023. "Pyrolysis of Waste Biomass: Technical and Process Achievements, and Future Development—A Review," Energies, MDPI, vol. 16(4), pages 1-26, February.
    3. Lim, B.A. & Lim, S. & Pang, Y.L. & Shuit, S.H. & Kuan, S.H., 2023. "Critical review on the development of biomass waste as precursor for carbon material as electrocatalysts for metal-air batteries," Renewable and Sustainable Energy Reviews, Elsevier, vol. 184(C).
    4. Liu, Hongwei & Wang, Yongzhen & Lv, Liang & Liu, Xiao & Wang, Ziqi & Liu, Jun, 2023. "Oxygen-enriched hierarchical porous carbons derived from lignite for high-performance supercapacitors," Energy, Elsevier, vol. 269(C).

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