Factores que afectan la textura y estructura de Ti(R)-MCM-41

Studied was the effect surfactant removal and titanium content have on the structure and textural properties of Ti-MCM-41 mesoporous materials. The synthesized solids were characterized by N 2 adsorption, X-ray fluorescence (FRX), X-ray diffraction (DRX), electronic microscopy of high resolution (HREM), and FT-Raman and UV-vis diffuse reflectance spectroscopy (DRS). Between the two methods of surfactant removal studied, the application of a polar solvent (solution of 0.05 M H 2 SO 4 in ethanol) was to be more effective in removing the surfactant and diminishing the destruction of mesoporous material during calcination. The samples treated by this method showed a more ordered hexagonal pore arrangement (HREM, XRD) and larger surface area. The effect of an increase in TiO 2 content in synthesized solids translates itself into a significant decrease of the peak intensity characteristic of TiMCM-41 (2Θ = 2.2-2.5 o ) and textural properties (S BET pore volume), which indicates that during the synthesis it is not possible to incorporate more than 10 mol. % of TiO 2 into the MCM-41 framework.