Abstract
Mesoporous siliceous MCM-41 (SiMCM-41) molecular sieves with silicon partially substituted by Al and Ti were synthesized by direct hydrothermal method. Titania-modified MCM-41 molecular sieves (TiO 2 /MeMCM-41, where Me = Si, Al or Ti) were then prepared from tetrabutyltitanate and the calcined MeMCM-41. The prepared materials were characterized by ICP-mass, XRD, XANES, nitrogen adsorption isotherm, TEM, SEM, IR, UV-visible, 29 Si and 27 A1 MAS-NMR, XPS, and EPR spectroscopy. All the spectroscopic studies resulted that Al and Ti located in the framework, and in the titania-modified samples, a well-defined surface layer of TiO 2 appeared on the MCM-41 surface. Infrared spectra of pyridine adsorption showed that A1MCM-41 possesses weak Brönsted and Lewis acidities, which were highly enhanced by the modified surface titania. The EPR spectra of the TiO 2 /MeMCM-41 after being reduced by evacuating or in hydrogen at 500°C, showed strong signals upon NO adsorption, and exhibited highly catalytic activity for the NO decomposition under UV irradiation.
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