Catalytic hydrothermal deoxygenation of sugarcane bagasse for energy dense bio-oil and aqueous fraction acidogenesis for biohydrogen production. (July 2023)

• Record Type: Journal Article
• Authors: Kopperi, Harishankar; Venkata Mohan, S.
• Is Part Of: Bioresource technology. Volume 379(2023)
• Publication Date: 2023-07
• Subjects: Agri biomass -- Hydrothermal liquefaction -- Alternative fuels -- Dark fermentation -- Biorefinery; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2023.128954
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Feasibility of Sugarcane bagasse (SCB) as potential feedstock for catalytic HTL. HTL derived biocrude can be served as alternative to fossil fuels. Ru/C resulted in higher bio-oil (28 %) and energy recovery (120.6 %) during HTL. The bioprocess (HTL-AF) showed 201 mL/g of bio-H2 with 64 % carbon conversion. The study supports zero-waste and carbon neutral efficient bio-refinery processes. Abstract: The study focuses on the effective conversion of sugarcane bagasse (SCB) by catalytic deoxygenation using various alkali and metal-based catalysts under N2 pressure employing water as solvent. The specific influence of catalyst over bio-crude yields (bio-oil and aqueous fraction) including energy recovery ratio was explored. The optimum catalytic condition (Ru/C) resulted in ∼ 70% of bio-crude and 28% of bio-oil with an improved HHV (31.6 MJ/kg) having 11.6% of aliphatic/aromatic hydrocarbons (C10 –C20 ) which can be further upgraded to drop-in fuels. The biocrude composed of 44% of aqueous soluble organic fraction (HTL-AF). Further, the carbon-rich HTL-AF was valorized through acidogenic fermentation to yield biohydrogen (Bio-H2 ). The maximum bio-H2 production of 201 mL/g of TOC conversion (K2 CO3 catalyst) was observed with 7.7 g/L of VFA. The SCB was valorized in a biorefinery design with the production of fuels and chemical intermediates in a circular chemistry approach.