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 |
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| 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 |