Abstract
A new composite catalyst for selective epoxidation of olefins with tert-butyl hydroperoxide ( tBHP) is reported. The catalyst contains manganese diimine complexes ( cis-Mn bis-2,2′-Bipyridyl), occluded within a NaY zeolite, in turn incorporated in a polydimethylsiloxane membrane ( cis-[Mn(bpy) 2] 2+-NaY-PDMS). The three-step synthesis consists of a Mn 2+exchange of NaY, ligand sorption to form cis-[Mn(bpy) 2] 2+-NaY and incorporation of the latter in a PDMS membrane. The major differences between [Mn(bpy) 2] 2+-NaY as such and occluded in PDMS are observed in the sorption and catalytic characteristics. With the membrane system, the use of a solvent becomes obsolete. Whereas optimal cyclohexene oxidation with [Mn(bpy) 2] 2+-NaY occurs with hydrogen peroxide in acetone, tBuOOH proves to be a better oxidant for [Mn(bpy) 2] 2+-NaY-PDMS. The reactions in batch and fed-batch reactors are discussed. A simple regeneration procedure, monitored by FT-IR spectroscopy is proposed.
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