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Peculiarities of bio-oil and biochar obtained from the lignin-rich residue of the enzymatic hydrolysis of sugarcane bagasse

Author

Listed:
  • Gomes, Gustavo R.
  • de Jesus, Ester G.
  • Jacintho, Jaqueline C.C.
  • García, Diana L.G.
  • Alencar, Bárbara R.A.
  • Gabetto, Fernanda P.
  • Gomes, Joice J.
  • Carvalho, João L.N.
  • Strauss, Mathias
  • Driemeier, Carlos

Abstract

In the quest for sustainable energy and climate solutions, this work investigates the pyrolysis of the lignin-rich enzymatic hydrolysis residue (EHR), a feedstock available at scale in the nascent cellulosic ethanol industry. The uniqueness of EHR was investigated by a systematic series of feedstocks, submitting sugarcane bagasse to steam-explosion pretreatment followed by carbohydrate enzymatic hydrolysis. The solid biomass of each process step (raw, pretreated, and EHR) was pyrolyzed (450 °C, 30 min, fixed bed reactor), followed by comprehensive characterization of bio-oil (FTIR, NMR, GPC, and GC-MS) and biochar (SEM, XPS, Raman, and TGA), and biochar stability and application assays (methylene blue adsorption and soil greenhouse gas emissions). EHR bio-oil was less oxygenated (mainly through lower carboxyl content) and slightly enriched in aromatics. EHR biochar was less oxygenated, more graphitic, and more stable (mechanically and thermally). These are favorable traits for fuels and chemicals from bio-oil and carbon removal with biochar. Nevertheless, EHR biochar applications showed lower dye adsorption and higher nitrous oxide emissions from biochar-treated soils. These findings demonstrate that EHR pyrolysis is a promising pathway to expand biomass carbon utilization and instigate further research to optimize EHR pyrolysis and enhance the functionality of EHR biochar for agri-environmental applications.

Suggested Citation

  • Gomes, Gustavo R. & de Jesus, Ester G. & Jacintho, Jaqueline C.C. & García, Diana L.G. & Alencar, Bárbara R.A. & Gabetto, Fernanda P. & Gomes, Joice J. & Carvalho, João L.N. & Strauss, Mathias & Driem, 2025. "Peculiarities of bio-oil and biochar obtained from the lignin-rich residue of the enzymatic hydrolysis of sugarcane bagasse," Renewable Energy, Elsevier, vol. 241(C).
    • Handle: RePEc:eee:renene:v:241:y:2025:i:c:s0960148124023504
    DOI: 10.1016/j.renene.2024.122282
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    References listed on IDEAS

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    1. Antonio Bizzo, Waldir & Lenço, Paulo César & Carvalho, Danilo José & Veiga, João Paulo Soto, 2014. "The generation of residual biomass during the production of bio-ethanol from sugarcane, its characterization and its use in energy production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 29(C), pages 589-603.
    2. Wang, Xiaoxiang & Cao, Li & Lewis, Rosmala & Hreid, Tubuxin & Zhang, Zhanying & Wang, Hongxia, 2020. "Biorefining of sugarcane bagasse to fermentable sugars and surface oxygen group-rich hierarchical porous carbon for supercapacitors," Renewable Energy, Elsevier, vol. 162(C), pages 2306-2317.
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    4. Xu, Jun & Liu, Jiawei & Ling, Peng & Zhang, Xin & Xu, Kai & He, Limo & Wang, Yi & Su, Sheng & Hu, Song & Xiang, Jun, 2020. "Raman spectroscopy of biochar from the pyrolysis of three typical Chinese biomasses: A novel method for rapidly evaluating the biochar property," Energy, Elsevier, vol. 202(C).
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