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

CHANQUIA C; CANEPA A; SAPAG K; VILLAROEL J; CRIVELLO M; HERRERO E; CASUSCELLI S; EIMER G

San Pedro

Simposio; Fifth San Luis Symposium on Surfaces, Interfaces and Catalysis.; 2010

In this work mesoporous molecular sieves type MCM-41 were synthesized with differentVanadium content in the initial synthesis gel. These materials showed spherical morphology witha narrow particle size distribution between 2-4 μm. The techniques used for physicochemicalcharacterization of these catalysts were: XRD, AAS, N2 physisorption, SEM, TEM, DR-UV-visand FT-IR-Py. All materials presented high specific surface area (> 900 m2/g), characteristic ofMCM-41 materials. By TEM measures was observed a well-defined mesoporous structure;however there was no one-dimensional ordering of pores characteristic of such materials. Thesample synthesized with the highest content of V presented marked differences in their structuralcharacteristics ascribed to the presence of V2O5 nano-particles. From analysis of DR-UV-vis itwas infer a successful incorporation of cations V5+ to silica structure in tetrahedral coordinationwith oxygen of the network. The catalytic activity of these materials was evaluated in the testreaction of cyclohexene oxidation using H2O2 as an oxidizing agent, showing a high conversion~ 93 % respect to maximum