Journal
FUEL
Volume 285, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.119150
Keywords
Hydrothermal liquefaction; Biomass; Biocrude oil; Ethanol-water mixed solvents; Metallic iron; In-situ hydrogen
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Funding
- National Natural Science Foundation of China [51776055]
- Natural Science and Engineering Research Council of Canada (NSERC)
- China Scholarship Council (CSC)
- Agriculture and Agri-Food Canada's AgriScience Program through the BioMass Canada
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The study investigates the effects of metallic Fe on biocrude oil production from cornstalk via hydrothermal liquefaction in ethanol-water mixed solvents. Results show that Fe can improve the yield and quality of biocrude oil by promoting hydrogenation and deoxygenation of liquid products.
In this article, effects of metallic Fe on biocrude oil production from cornstalk via hydrothermal liquefaction (HTL) in ethanol-water mixed solvents were investigated under various conditions. Experiments were conducted in single solvent of water or ethanol using Fe3O4 catalyst to explore the role of metallic Fe in the liquefaction process. The physiochemical properties of the liquefaction products were comprehensively characterized by elemental analysis, GC-MS, FT-IR and XRD. The results showed that the maximum biocrude oil yield (approx. 50 wt%) and higher heating value (HHV) of 30.86 MJ/kg were obtained in ethanol-water mixed solvents (50/50, v/ v) at 300 degrees C for 30 min with 10 wt% Fe loading. It was found that the presence of Fe also promoted the hydrogenation and deoxygenation of liquid products, obtaining biocrude oils mainly consisted of phenolic, ester and hydrocarbon compounds. The positive role of metallic Fe in HTL of biomass in ethanol-water mixed solvents, simultaneously improving the yield and quality of biocrude oil, was believed to be due to in-situ hydrogen formed from the reaction of metallic Fe and water, while the generated Fe3O4 exhibited negligible catalytic effect in the process.
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