Abstract
Hierarchical ZSM-5 zeolite with composite micro and mesoporous was obtained by alkali treatment of parent ZSM-5 for 60 min. Vanadia was loaded on modified zeolite by wetness impregnation technique (VDZ). The prepared samples were characterized by various techniques including XRD, FTIR, TGA, UV-DRS, TEM, XPS and nitrogen adsorption–desorption. Vanadia loaded sample was found to exhibit excellent catalytic activity for the epoxidation of cyclohexene by tertiary butyl hydroperoxide. A controlled reaction was carried out to demonstrate the utility of hierarchical topology of the catalyst. A free radical mechanism was proposed for the reaction with rate constant of 6.91 × 10−2 L mol−1 min−1 and activation energy of 41.81 kJ mol−1. The reaction was carried out without the use of any solvent and the catalytic activity of VDZ was retained even after five runs.
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Acknowledgments
The authors are grateful to UGC for providing BSR fellowship to one of the workers (MN). The authors also sincerely acknowledge Department of Physics and Meterology, IIT Kharagpur, India for XPS analysis, Central Instrument Facility, North eastern Hill University for TEM analysis. The authors also thank Department of Chemistry and Instrumentation and USIC, Gauhati University, for XRD and other relevant measurements associated with the present work.
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Nandi, M., Talukdar, A.K. Vanadia loaded hierarchical ZSM-5 zeolite: a promising catalyst for epoxidation of cyclohexene under solvent free condition. J Porous Mater 23, 1143–1154 (2016). https://doi.org/10.1007/s10934-016-0172-5
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DOI: https://doi.org/10.1007/s10934-016-0172-5