Oxidation of Cyclohexene with H₂O_{_2} Catalyzed by Vanadium Based Polyoxometalates Doped Modified Clays as Green Catalysts

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 the 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 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 31 P 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.

Kinetics of Triphase Extractive Oxidative Desulfurization of Benzothiophene with Molecular Oxygen Catalyzed by HPA‐5

“…S1). These bands result in the interaction of P with O and Mo with O, respectively, whereby the interaction of Mo and O leads to three distinguishable bands, depending on the position of the oxygen within the Keggin structure .…”

Extraction-Coupled Oxidative Desulfurization (ECODS) of n-Tetradecane as Model Oil under Moderate Conditions Using Molecular Oxygen

“…Absorption bands described in the literature for HPA-5 also appear in the IR spectrum. These bands result in the interaction of P with O and Mo with O, respectively, whereby the interaction of Mo and O leads to three distinguishable bands depending on the position of the oxygen within the Keggin structure. , The FTIR spectra were recorded in KBr discs using a Jasco FT/IR-4100 spectrometer.…”

HKUST-1 Supported on Zirconium Phosphate as an Efficient Catalyst for Solvent Free Oxidation of Cyclohexene: DFT Study

“…Three major products cyclohexenol, cyclohexenone and cyclohexene oxide were obtained with 49% conversion in 7 h. PVMo/Hmont has been reported for allylic oxidation with hydrogen peroxide. Cyclohexene oxide, cyclohexenol, cyclohexenone and cyclohexanol were produced where the conversion was 98% [8]. Junghans et al [9] has reported Copper-MOF (metal-organic framework) with triazolyl isopthalate linkers for oxidation of cyclohexene where the three major products were obtained with tertiary butyl hydroperoxide (TBHP) after 7 h. Farzaneh et al [10] reported Mn-MOF with benzenetricarboxylate (BTC) and dimethylfurane (DMF) for oxidation of different alkanes and alkenes in the presence of TBHP.…”