The hydroesterification process is presented for biodiesel production from Nannochloropsis oculata microalgae biomass. Biodiesel
studied in this work is the main product from hydroesterification of biomass, the Nannochloropsis oculata, and was obtained from
esterification of fatty acid (product of an hydrolysis reaction) with methanol. As catalyst we used the pure niobium oxide (NP) as well as
supported on alumina (Nb2O5/Al2O3) (NS) and impregnated with phosphoric acid (Nb2O5/H3PO4) (NIF). The product was evaluated by
gas chromatography and other analyses. The optimum conditions found in the conversion (%) for the hydrolysis reactions of Nb2O5
(88.86%), by Nb2O5/Al2O3 (92.00%) and Nb2O5/H3PO4 (95.45%), were observed in the biomass concentration 20%, 300°C. For esterification
of fatty acids of Nannochloropsis oculata with NP (86.03%), NS (93.55%) and NIF (95.43%), we observed the molar ratio methanol:
fatty acid 3:1, at 200°C with 20% of catalyst.
Keywords: Biodiesel, Microalgae, Hydrolysis, Esterification, Nannochloropsis oculata, Niobium oxide catalyst, Alumina, Phosphoric acid.
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