文摘
In order to improve the catalytic performance in the Baeyer–Villiger oxidation of cyclohexanone by molecular oxygen, ordered mesoporous Sn–TiO2 catalysts with high Lewis acidity were successfully designed and synthesized via a facile one-pot evaporation induced self-assembly method. Their physical and chemical properties were characterized by different techniques including XRD, N2 adsorption–desorption, UV–Vis spectra, ICP, Py-IR, SEM and TEM. The XRD, TEM and N2 adsorption–desorption results showed that the ordered mesoporous structure can be preserved after tin incorporation. The UV–Vis, SEM and Py-IR results indicated that tin species can be homogeneously tetrahedrally incorporated in the crystalline framework of mesoporous anatase TiO2 and create the Lewis acidity. The ordered mesoporous 15Sn–TiO2 catalyst showed highest catalytic performance where cyclohexanone conversion of 91.4 % and ε-caprolactone selectivity of 93.2 %. Moreover, catalytic recycling tests demonstrated that the Sn–TiO2 catalysts exhibited high potential reusability.