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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 & 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).
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    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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    3. Li, Jun & Zhong, Dian & Zeng, Kuo & Chen, Xin & Wu, Boyang & Liu, Tianji & Yang, Haiping & Chen, Hanping, 2024. "Co-pyrolysis of algae and lignocellulosic biomass in molten salts to produce N-doped carbon for supercapacitor application," Energy, Elsevier, vol. 305(C).

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