Synthesis, characterization and catalytic performance of ordered mesoporous Sn-Al catalysts

摘要

A series of ordered mesoporous Sn-Al catalysts with high specific surface area, large pore volume and uniform pore size were successfully synthesized via facile one-pot evaporation induced self-assembly method. Different characterization techniques, such as XRD, N-2 adsorption-desorption, ICP, NH3-TPD, TEM and UV-vis spectra were employed to investigate their physical chemical properties, and these catalysts were applied in the Baeyer-Villiger oxidation of cyclohexanone by molecular oxygen. The characteristic results showed that Sn-Al catalysts exhibited wormhole-like mesostructured and narrow pore-size distribution. The acidity of Sn-Al catalysts can be promoted by homogeneous incorporation of Sn species into the framework of Al2O3, which is beneficial to their catalytic performances in the Baeyer-Villiger oxidation of cyclohexanone by molecular oxygen. The Sn-Al catalyst when adding 7 % the weight percent of Sn in the catalyst shows higher yield of e-caprolactone than other catalysts, and it exhibited excellent catalytic stability even after repeated reaction for five times.