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Volatile-char interactions during biomass pyrolysis: Effects of AAEMs removal and KOH addition in char

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  • Li, Bin
  • Huang, Huimin
  • Xie, Xing
  • Wei, Juntao
  • Zhang, Shu
  • Hu, Xun
  • Zhang, Shihong
  • Liu, Dongjing

Abstract

The effects of Alkali/alkaline earth metals (AAEMs) removal and KOH addition in char on formation and distribution of wheat straw pyrolysis products during volatile-char interactions were studied in a fixed-bed reactor. The results showed that after AAEMs removal from char, significant interactions between volatiles and char still existed, as its non-condensable gas yield greatly increased with less detectable organics observed in bio-oil compared to pure wheat straw pyrolysis. XPS results indicated that more aromatic carbon structures (C-Cprimary) were exposed on char surface after AAEMs removal, which might act as active sites during the interactions. KOH addition in char exhibited much bigger cracking performance than its interior K in char, resulting in a significant reduction in bio-oil yield and a great increase in non-condensable gas yield. KOH addition in char might promote decarboxylation, decarbonylation and sugar-ring opening reactions, leading to the decrease of linear acids and carbonyls and anhydrosugars and the increase of phenols and other aromatics in bio-oil. The cracking/decomposition of furans, cyclopentenones, and phenols and other aromatics would also be largely enhanced with the increasing amount of KOH addition. In addition, KOH in char could act as a catalyst for the char self-reforming by volatiles during the interactions.

Suggested Citation

  • Li, Bin & Huang, Huimin & Xie, Xing & Wei, Juntao & Zhang, Shu & Hu, Xun & Zhang, Shihong & Liu, Dongjing, 2023. "Volatile-char interactions during biomass pyrolysis: Effects of AAEMs removal and KOH addition in char," Renewable Energy, Elsevier, vol. 219(P1).
    • Handle: RePEc:eee:renene:v:219:y:2023:i:p1:s0960148123013745
    DOI: 10.1016/j.renene.2023.119459
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    References listed on IDEAS

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    1. Li, Bin & Song, Mengge & Xie, Xing & Wei, Juntao & Xu, Deliang & Ding, Kuan & Huang, Yong & Zhang, Shu & Hu, Xun & Zhang, Shihong & Liu, Dongjing, 2023. "Oxidative fast pyrolysis of biomass in a quartz tube fluidized bed reactor: Effect of oxygen equivalence ratio," Energy, Elsevier, vol. 270(C).
    2. Gao, Anjiang & Wang, Yao & Lin, Guiying & Li, Bin & Hu, Xun & Huang, Yong & Zhang, Shu & Zhang, Hong, 2022. "Volatile-char interactions during biomass pyrolysis: Reactor design toward product control," Renewable Energy, Elsevier, vol. 185(C), pages 1-7.
    3. Li, Bin & Magoua Mbeugang, Christian Fabrice & Huang, Yong & Liu, Dongjing & Wang, Qian & Zhang, Shu, 2022. "A review of CaO based catalysts for tar removal during biomass gasification," Energy, Elsevier, vol. 244(PB).
    4. Shen, Dekui & Jin, Wei & Hu, Jun & Xiao, Rui & Luo, Kaihong, 2015. "An overview on fast pyrolysis of the main constituents in lignocellulosic biomass to valued-added chemicals: Structures, pathways and interactions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 761-774.
    5. Li, Bin & Zhao, Lijun & Xie, Xing & Lin, Dan & Xu, Huibin & Wang, Shuang & Xu, Zhixiang & Wang, Junfeng & Huang, Yong & Zhang, Shu & Hu, Xun & Liu, Dongjing, 2021. "Volatile-char interactions during biomass pyrolysis: Effect of char preparation temperature," Energy, Elsevier, vol. 215(PB).
    6. Liu, Shasha & Wu, Gang & Gao, Yi & Li, Bin & Feng, Yu & Zhou, Jianbin & Hu, Xun & Huang, Yong & Zhang, Shu & Zhang, Hong, 2021. "Understanding the catalytic upgrading of bio-oil from pine pyrolysis over CO2-activated biochar," Renewable Energy, Elsevier, vol. 174(C), pages 538-546.
    7. Mei, Zhenfei & He, Xingchu & Chen, Dezhen & Wang, Na & Yin, Lijie & Qian, Kezhen & Feng, Yuheng, 2021. "Comparison of chars from municipal solid waste and wheat straw for understanding the role of inorganics in char-based catalysts during volatile reforming process," Energy, Elsevier, vol. 229(C).
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    2. Liang Zhu & Fangbin Wang & Jing Qi, 2024. "Washing walnut shells with the aqueous part of pyrolysis liquids: effect on biomass and pyrolysis product quality," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 26(11), pages 29169-29187, November.

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