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Greener and sustainable method for alkene epoxidations by polymer-supported Mo(VI) catalysts

Ambroziak, K. and Mbeleck, R. and Saha, B. and Sherrington, D.C. (2010) Greener and sustainable method for alkene epoxidations by polymer-supported Mo(VI) catalysts. International Journal of Chemical Reactor Engineering, 8 (A125). pp. 1-13. ISSN 1542-6580

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A polybenzimidazole supported Mo(VI) (PBI.Mo) catalyst has been prepared and characterised. The catalytic activities of the PBI.Mo catalyst in epoxidation of alkenes with tert-butyl hydroperoxide (TBHP) as an oxidant have been studied under different reaction conditions in a batch reactor. As alkene representatives we have chosen cyclohexene, limonene, α-pinene and 1-octene (a less reactive terminal alkene). The order of reactivity of the alkenes was found to be: cyclohexene>limonene>α-pinene>1-octene. The stability of each polymer catalyst was assessed by recycling a sample in batch reaction using conditions that will form the basis of the continuous process. The loss of Mo from each support has been investigated by isolating any residue from the reaction supernatant solutions, following removal of the heterogeneous polymer catalyst, and then using the residues as potential catalysts in epoxidation reactions.