Chemical Composition of Bio-oil Obtained via Hydrothermal Liquefaction of Arthrospira platensis Biomass
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The chemical composition of bio-oil obtained from Arthrospira platensis biomass via hydrothermal liquefaction at 240–330°C has been studied with an elemental analysis and Fourier transform ultrahigh resolution mass spectrometry with ionic cyclotron resonance. An increase in temperature leads to an increased bio-oil yield, decreased oxygen, and an increase in the amount of carbon and nitrogen. The weighted Kendrick mass defect histogram showed for the first time that the main nitrogen-containing and oxygen-containing compounds are ON, O2N3, O3N2, ON2, N, and N2. The character of the change in their relative amount in bio-oil with a temperature change is also revealed. The Venn diagram shows the intersection of the sets of molecular formulas found in bio-oil samples obtained at different temperatures. The results may be used to optimize the hydrothermal liquefaction of microalgae and their subsequent processing into motor fuel.
This work was financially supported by the Russian Foundation for Basic Research (project no. 17-19-01617).
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