Oxidation of Cyclohexene with H2O2 Catalyzed by Vanadium Based Polyoxometalates Doped Modified Clays as Green Catalysts
S. Boudjemaa,b, H. Rabah a and A. Choukchou-Braham a
aLaboratory of Catalysis and Synthesis in Organic Chemistry, Faculty of Sciences, University of Tlemcen, Algeria
bKasdi Merbah University, Faculty of Hydrocarbons, Renewable Energy, Earth Sciences and Universe, Ouargla, Algeria
Full Text PDF
The catalytic performance of supported heteropolyacids in various liquid-solid and gas-solid heterogeneous reactions may be affected by the choice of support and/or the method of heteropolyacid deposition. Vanadium substituted polyphosphomolybdate with the Keggin structure H4[PVMo11O40]ยท 13H2O (PVMo) was dispersed throughout acid activated bentonite (clay from Hammam Boughrara, Maghnia, Algeria). A series of catalysts were prepared via modified impregnation. Modified preparation method employed ultrasonication as a means of the dispersion homogenization, followed by freeze-drying. The catalysts were characterized by the Brunauer-Emmett-Teller, the Fourier transform: infrared, and 31P solid-state magic angle spinning-NMR spectroscopy. The catalytic performance of PVMo/Hmont was evaluated in the oxidation of cyclohexene. Intact Keggin anions were preserved on Hmont after deposition aided by ultrasonication. The obtained results showed that a better catalytic activity can be obtained with PVMo/bentonite (98% of conversion: and 89% of cyclohexene oxide), by drop addition of H2O2, for 3 h.

DOI: 10.12693/APhysPolA.132.469
topics: heteropolyacids, bentonite, acid catalyst, cyclohexene oxidation, hydrogen peroxide