Abstract
Methyltrioxorhenium (MTO) supported on silica–alumina acts as a heterogeneous catalyst for the metathesis of 1-octene. 7.5% (m/m) MTO on the support gave a maximum percentage of homo-metathesis products. The reaction reached equilibrium after 1.5 h at room temperature. Addition of cesium ions onto the silica–alumina support increased the selectivity towards homo-metathesis products but decreased the total metathesis activity. The optimum percentage of cesium ions on the support was found to be 3.3%. Addition of 1% oxygen-containing additives to the 1-octene like 2-hexanone, pentanal, butanol and pentanoic acid, increased the homo-metathesis products and decreased the cross-metathesis products of 1-octene catalysed by the MTO/SiO2·Al2O3 catalytic system. Higher concentrations of additives decreased the activity of the catalytic system.
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