Algerian Journal of Engineering Research
Volume 1, Numéro 2, Pages 30-36
2017-12-01
Synthesis Of Keggin Type Vanadophosphomolybdate Supported Modified Clays And Their Catalytic Performance In Cyclohexene Epoxidation
Authors : Souheyla Boudjema . Hafsa Rabah . Abderrahim Choukchou-braham .
Abstract
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 Keggin structure H4[PVMo11O40].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 used ultrasonication as a means of the dispersion homogenization, followed by freeze-drying. The catalysts were characterized by BET, FT-IR and 31P solid-state MAS-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 hours.
Keywords
Heteropolyacids; Bentonite; Acid catalyst; Cyclohexene epoxidation; Hydrogen peroxide.
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