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Bio-crude oil production using catalytic hydrothermal liquefaction (HTL) from native microalgae harvested by ozone-flotation

Lookup NU author(s): Dr Sharon Velasquez OrtaORCiD, Professor Adam Harvey, Professor Maria Orta Ledesma



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


© 2018 Elsevier Ltd This work explored bio-crude oil production and the hydrocarbon distribution resulting from a catalytic HTL process with a feedstock composed by native consortium of microalgae (mostly cyanobacteria) with low lipid and high protein content. Two harvesting methods ozone-flotation and centrifugation were compared. Also, the effect of the catalysts, HZSM-5 zeolite, content (0, 5 and 7 wt% loading with respect to dry biomass) were studied. The dry biomass was liquefied in water (slurry at 4 wt%) at 350 °C for 120 min. Results showed that the bio-crude contained aliphatic, aromatic, cyclic, oxygenated cyclic and aliphatic compounds containing N and O, with a bio-crude yield of between 10 and 16%. The best quality of bio-crude oil was produced from microalgae harvested and pretreated by ozone-flotation at 7 wt% HZSM-5. The increase in the bio-crude quality was a result of a lower nitrogen (3.2%), oxygen (4.8%) and sulfur (0.7%) content versus centrifuged (no catalyst) microalgae 4.6%, 7.9% and 1.6% respectively.

Publication metadata

Author(s): Nava Bravo I, Velasquez-Orta SB, Cuevas-Garcia R, Monje-Ramirez I, Harvey A, Orta Ledesma MT

Publication type: Article

Publication status: Published

Journal: Fuel

Year: 2019

Volume: 241

Pages: 255-263

Print publication date: 01/04/2019

Online publication date: 18/12/2018

Acceptance date: 13/12/2018

Date deposited: 26/02/2019

ISSN (print): 0016-2361

ISSN (electronic): 1873-7153

Publisher: Elsevier Ltd


DOI: 10.1016/j.fuel.2018.12.071


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