Synthesis, Characterization and Catalytic Efficiency of Ti-SBA-15 Mesoporous Materials

Abstract

Ti-SBA-15 mesoporous materials were directly synthesized via a hydrothermal process and characterized by using nitrogen adsorption-desorption measurements, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, diffuse reflectance ultraviolet-visible spectroscopy, and infrared ray spectroscopy. The effect of synthesis temperatures on the structure and catalytic efficiency in epoxidation of cyclohexene was discussed in details. The results showed that the optimal temperature was 100 °C under the reaction conditions.

Preparation and Characterization of Ti-SBA-15 Mesoporous Materials with Varying Si/Ti Molar Ratios

“…The results indicated that Ti-SBA-15 materials retained the ordered mesoporous structure of SBA-15. Moreover, compared with pure SBA-15, there was a shift towards lower angles for the characteristic peaks of the Ti-SBA-15 due to the fact that the Ti-O bond is longer than that of Si-O [5]. Fig.…”

“…Therefore, it is of great importance to introduce active sites in the mesopore frameworks. To date, much effort has been made to the study of the catalytic efficacy of mesoporous molecular sieves containing titanium [5][6][7]. The results showed that the reaction presented a high velocity during the 1st hours and cyclohexene epoxide was the main product.…”

“…It is generally acknowledged that the selectivity of cyclohexene epoxide increased significantly with the increase of reaction time for all the present catalysts. Our previous work [5] reported that the percent Advanced Materials Research Vols. 482-484 of by-products decreased with the increase of reaction time.…”