The effect of redox properties of ceria-supported vanadium oxides in liquid phase cyclohexene oxidation
作者： Sanaa El-Korso , Sumeya Bedrane , Abderrahim Choukchou-Braham , Redouane Bachir
DOI: 10.1039/C5RA11430F
关键词: Selectivity 、 Heptane 、 Vanadium 、 Cyclohexene 、 Diffuse reflectance infrared fourier transform 、 Chemistry 、 Infrared spectroscopy 、 Catalysis 、 Fourier transform infrared spectroscopy 、 Inorganic chemistry
摘要: Several VO2/CeO2 based catalysts, with V loadings between 5 and 20 wt%, were prepared by impregnation subsequently dried, calcined reduced at 673 K. The structural characterization of these materials was carried out using X-ray diffraction (XRD), N2 adsorption–desorption 77 K, UV-vis diffuse reflectance spectroscopy (DR UV-vis) Fourier-transform infrared (FTIR). Their catalytic activities in the epoxidation cyclohexene, TBHP as oxidant heptane solvent, also examined. XRD results revealed a good dispersion VO2 species on ceria. FTIR DR UV-visible techniques indicated that polymeric vanadyl are present all catalysts crystalline phase appears wt% vanadium sample. Experimental catalyst activity decreases increased loading, whereas epoxide selectivity up to 90% when vanadia loading reached 15 wt%. In case VO2/CeO2, reaction switched towards 100% enol, enone selectivity. presence CeVO4 shown influence conversion reaction.
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