Abstract
Hydrodeoxygenation (HDO) of isoeugenol (IE) was investigated using bimetallic iridium–rhenium and platinum–rhenium catalysts supported on alumina in the temperature and pressure ranges of 200–250 °C and 17–40 bar in nonpolar dodecane as a solvent. The main parameters were catalyst type, hydrogen pressure, and initial concentration. Nearly quantitative yield of the desired product, propylcyclohexane (PCH), at complete conversion in 240 min was obtained with Ir–Re/Al2O3 prepared by the deposition–precipitation method using 0.1 mol/L IE initial concentration. High iridium dispersion together with a modification effect of rhenium provided in situ formation of the IrRe active component with reproducible catalytic activity for selective HDO of IE to PCH. The reaction rate was shown to increase with the increasing initial IE concentration promoting also HDO and giving a higher liquid phase mass balance. Increasing hydrogen pressure benefits the PCH yield.
Highlights
Due to depleting fossil resources, such energy sources as biooil from biomass, wood or woody crops, and agricultural wastes[1,2] are nowadays considered as viable alternatives
The results revealed that the 9.3-fold enhancement of TOF was obtained in the initial TOF of dihydroeugenol with an increase in the initial isoeugenol concentration
Hydrodeoxygenation (HDO) of isoeugenol was investigated at 200−250 °C under 17−40 bar hydrogen pressure for the first time using a range of mono- and bimetallic Pt, Ir, and Re catalysts in dodecane as a solvent
Summary
Due to depleting fossil resources, such energy sources as biooil from biomass, wood or woody crops, and agricultural wastes[1,2] are nowadays considered as viable alternatives. Organic elemental analysis results showed that the carbon content increases after isoeugenol HDO at 250 °C and 30 bar in the spent IRA
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