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

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

Renewable Energy, 2025, vol. 241, issue C

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.

Keywords: Sugarcane bagasse; Enzymatic hydrolysis residue; Bio-oil; Biochar applications (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:241:y:2025:i:c:s0960148124023504

DOI: 10.1016/j.renene.2024.122282

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