2.4 Product analysis
The esterification and hydrogenation products were analyzed on an Agilent 7890A gas chromatograph equipped with a flame ionization detector (FID) and an HP PONA capillary column (50 m × 0.2 mm × 0.5 μm). During the analysis, the flow rate of the N2 carrier gas was 0.2 mL min–1. The flow rates of H2 and air were 30 mL min–1 and 400 mL min–1, respectively. The temperatures of the injector and FID were both 523 K. The initial temperature of the column was set at 333 K, which was raised to 473 K at the heating rate of 5 K min–1 and maintained for 15 min. The column temperature was further raised to 513 K at a heating rate of 5 K min–1 and maintained for 50 min.
On the basis of the chromatographic results, the conversion of cyclohexene during esterification was calculated as (initial moles of cyclohexene – moles of cyclohexene after reaction)/(initial moles of cyclohexene) × 100%. The selectivity to cyclohexyl acetate was calculated as (moles of cyclohexyl acetate after reaction)/(initial moles of cyclohexene) × 100%.
The conversion of cyclohexyl acetate during hydrogenation was calculated as (initial moles of cyclohexyl acetate – moles of cyclohexyl acetate after reaction)/(initial moles of cyclohexyl acetate) × 100%. The selectivity to cyclohexanol was calculated as (moles of cyclohexanol after reaction)/(initial moles of cyclohexyl acetate) × 100%.