Mesoporous silicates with spherical morphology modified with Vanadium, highly active in oxidation of cyclohexene with H2O2

CHANQUÍA CORINA M.; CÁNEPA ANALÍA L.; SAPAG KARIM; REYES PATRICIO; CASUSCELLI SANDRA G.; HERRERO EDUARDO R; EIMER GRISELDA A

SPRINGER/PLENUM PUBLISHERS

Año: 2011 vol. 54 p. 160 - 160

anadium-containing mesoporous molecular sieves have been prepared by hydrothermal treatment at 373 K. These materials showed spherical morphology with a narrow particle size distribution between 2 and 4 nm. The techniques used for their physicochemical characterization were: XRD, AAS, N2 physisorption, SEM, TEM and DRUVVis spectroscopy. All the materials presented high specific surface area (900 m2/g), characteristic of MCM-41 materials. A well-defined mesoporous structure was observed by TEM measures although there was no onedimensional ordering of pores characteristic of such materials. Additionally, secondary mesoporosity domains were determined in the BJH size distribution. The sample synthesized with the highest content of V presented marked differences in their structural characteristics, which were attributed to the blockage of channels by the presence of nano-clusters and/or VxOy nano-oxides. From the DRUVVis analysis, a successful incorporation of V ions to silica structure i