In the presence of Re2O7 supported on γ-Al2O3, the self-metathesis of 1-octene was conveniently carried
out under continuous-flow (CF) conditions using supercritical CO2 (scCO2) as a carrier. This investigation
allowed optimization of reaction parameters, the best values of which were found to be 100 °C and
90 bar, operating at flow rates of 0.05 and 1 mL min−1
for 1-octene and scCO2, respectively, the reaction
proceeded with very good self-metathesis selectivity (>90%) and an average productivity of ∼0.24 mL
tetradecene gRe
−1
min−1
. Although the catalyst was completely deactivated after the first 100–150 min of
reaction, it could be recycled for (at least) five subsequent reactions without any loss of performance. The
results provided incontrovertible evidence that for the investigated reaction, scCO2was a superior carrier
with respect to conventional liquids, such as toluene or n-hexane
