High-Density Jet-Fuel Hydrocarbons from Biomass-derived Cyclic Ketones via Vapor Phase Hydrodeoxygenation over Ru-Ni₂P/Al (10)-KIT-6

Abstract

Jet-fuel range hydrocarbons such as 97.2% bi-cyclohexane, 94.1% di-cyclohexyl methane, and 95.6% trans-decalin have been produced selectively from biomass-derived cyclic ketones, namely, phenyl cyclohexanone (PCHO), benzyl cyclohexanone (BCHO), and α-tetralone (TLO), by vapor phase hydrodeoxygenation (VP-HDO). In this work, a mesoporous Ru-Ni 2 P bimetallic Al/KIT-6 catalyst was prepared hydrothermally with Si/Al = 10. Vapor phase hydrodeoxygenation over Ru-Ni 2 P/Al (10)-KIT-6 with hydrogen pressure of 50 mL/min, 300−450 °C of reaction temperature, and 2−10 h of time was carried out and attained the highest selectivity and conversion. Under optimal reaction circumstances (400 °C, 8 h, H 2 = 50 mL/min), PCHO, BCHO, and TLO conversion over Ru (2.0)-Ni 2 P(4.0)/Al(10)-KIT-6 is 94.8, 96.2, and 92.7%, respectively. Ru particles on Ni 2 P promote C−O bond cleavage and complete ketone reduction, resulting in a synergistic interaction between Ru and Ni 2 P in VP-HDO catalysis. Jet-fuel hydrocarbon invention demonstrated the elimination of oxygen from BDK.

Efficient Self-Condensation of Cyclohexanone into Biojet Fuel Precursors over Sulfonic Acid-Modified Silicas: Insights on the Effect of Pore Size and Structure

“…In this way, CHO can be transformed via C–C coupling through a solventless self-aldol condensation into a C 12 oxygenated aldol adduct, which should be further hydrodeoxygenated (HDO reaction) to reach the final hydrocarbon product, linear, and/or cyclic. This chemical route starting form cyclic ketones has been recently shown as an alternative approach for producing jet fuel-range cyclic hydrocarbons . However, the monocondensed C 12 product can overreact with further CHO molecules to provide larger polycyclic oxygenated alkanes (C 18 –C 24 ), no longer suitable for jet fuel purposes .…”

“…This chemical route starting form cyclic ketones has been recently shown as an alternative approach for producing jet fuel-range cyclic hydrocarbons. 13 However, the monocondensed C 12 product can overreact with further CHO molecules to provide larger polycyclic oxygenated alkanes (C 18 –C 24 ), no longer suitable for jet fuel purposes. 14 Therefore, the control of the selectivity toward the monocondensed product appears as a key parameter.…”