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Issue 5, 2016
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Hydrodeoxygenation of microalgae oil to green diesel over Pt, Rh and presulfided NiMo catalysts

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Abstract

The catalytic characteristics, activity and selectivity of 1% Pt/Al2O3, 0.5% Rh/Al2O3 and presulfided NiMo/Al2O3 catalysts have been investigated in the hydrodeoxygenation of microalgae (Nannochloropsis salina) oil to produce green diesel in a microreactor. Coke accumulation decreased in the order NiMo > Pt > Rh. The amount of formed coke over NiMo increased with reaction duration, while no on-stream time dependence was found over Pt and Rh. Rhodium was found to be very active for CH4 production via hydrocracking at its freshly reduced state. The activity and selectivity of all three investigated catalysts were positively affected by increased reaction pressure, temperature, H2/oil ratio and residence time. The selectivity of NiMo for the hydrodehydration (DHYD) route was changed to a hydrodecarbonylation/hydrodecarboxylation (DCO/DCO2) route at a reduced H2/oil ratio and residence time, while the selectivity of Pt and Rh for the DCO/DCO2 route was not affected by the reaction conditions. The highest hydrocarbon yield, 76.5%, was obtained over 1% Pt (310 °C, 500 psig, 1000 SmL mL−1 gas/oil ratio, 1.5 s residence time), which is 13.8% higher than that over NiMo (360 °C, 500 psig, 1000 SmL mL−1 gas/oil ratio, 1 s residence time). The 50 °C decrease in the reaction temperature for Pt indicates possible energy saving via heat supply.

Graphical abstract: Hydrodeoxygenation of microalgae oil to green diesel over Pt, Rh and presulfided NiMo catalysts

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Publication details

The article was received on 09 ágú. 2015, accepted on 27 sep. 2015 and first published on 29 sep. 2015


Article type: Paper
DOI: 10.1039/C5CY01307K
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Citation: Catal. Sci. Technol., 2016,6, 1442-1454
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    Hydrodeoxygenation of microalgae oil to green diesel over Pt, Rh and presulfided NiMo catalysts

    L. Zhou and A. Lawal, Catal. Sci. Technol., 2016, 6, 1442
    DOI: 10.1039/C5CY01307K

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