A composite membrane was prepared by incorporating Ti-MCM-41 in PDMS (polydimethylsiloxane). Using this catalyst, the epoxidation of 1-octene was studied with focus on the influence of the polymer environment on the actual catalytic performance. Three different oxidants were investigated, as well as the influence of the solvent. It was found that the newly developed catalyst is especially interesting under solvent free reaction conditions where it might suppress side reactions. Furthermore, the removal of reagents and catalyst from the reaction mixture after reaction is facilitated and epoxidation in a continuous counter current membrane reactor becomes feasible.