Journal article
Preparation, Characterization and Catalytic Activity of MgO/SiO2 Supported Vanadium Oxide Based Catalysts



Publication Details
Authors:
Aboelfetoh, E.; Pietschnig, R.
Publisher:
SpringerDO - 10.1007/s10562-013-1098-z
Publication year:
2014
Journal:
Catalysis Letters
Pages range:
97-103
Volume number:
144
Start page:
97
End page:
103
ISSN:
1011-372X

Abstract
Vanadium oxide-based catalyst obtained by grafting VOCl3 on Florisil (MgO:SiO2) with the molar ratio of 15:85 have been studied for the selective oxidn. of cyclohexane in order to obtain cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone. The performances obtained have been compared with those of other catalysts in which vanadium oxide was supported on the same support by impregnation with ammonium oxalate. All the prepd. catalysts have been characterized using XRD, FTIR, TEM, SEM, EDX, DRS and TGA in order to rationalize the differences in performance obsd. The presence of magnesium oxide species (15 % MgO) on the surface of silica significantly modifies the mol. structure of the surface vanadium oxide species and changes their mol. structure from hydrated VO5/VO6 polymers to less polymd. VO4 species and/or isolated VO2(OH)2 species. The catalytic activities indicate that the VOx/Florisil catalysts show high conversions and TONs for those types contg. isolated VO4. Compared to previously studied VOx/SiO2 catalysts, the Florisil based systems show significantly improved leaching behavior. [on SciFinder(R)]


Keywords
cyclohexane oxidn, prepn characterization catalytic activity magnesia silica vanadium oxide catalysts


Authors/Editors

Last updated on 2018-06-12 at 10:50