TY - JOUR
T1 - Hydrodeoxygenation of microalgae oil to green diesel over Pt, Rh and presulfided NiMo catalysts
AU - Zhou, Lin
AU - Lawal, Adeniyi
N1 - Publisher Copyright:
© 2016 The Royal Society of Chemistry.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
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U2 - 10.1039/c5cy01307k
DO - 10.1039/c5cy01307k
M3 - Article
AN - SCOPUS:84959264494
SN - 2044-4753
VL - 6
SP - 1442
EP - 1454
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 5
ER -