Abstract：The silylation of uncalcined TS-1 titaniumsililate immobilized gold (Au/TS-1-B) catalyst was carried out by continuously introduce of hexamethyldisiloxane (HMDSO) during the reduction of Au/TS-1-B catalyst at high temperature, and the unsililated Au/TS-1-B catalyst was chosen as referenced catalyst aiming at demonstrating the influence of in-situ silylation on the catalytic performance of Au/TS-1-B catalyst in direct propylene epoxidation using H2 and O2. Characterization results manifested that the mean diameter of gold particles on the in-situ silylated Au/TS-1-B catalyst is smaller than the unsilylated Au/TS-1-B catalyst. Moreover, the X-ray photoelectron spectroscopy revealed that the in-situ silylated Au/TS-1-B catalyst exhibits higher Au0 4f7/2 binding energy than the unsilylated Au/TS-1-B catalyst. Furthermore, the number of Si-OH exposed on the surface of catalyst was significantly decreased in the in-situ silylated Au/TS-1-B catalyst. Therefore, the in-situ silylated catalyst exhibited significantly improved catalytic performance due to the synergistic modification of Au-Ti-Si sites on the Au/TS-1-B catalyst during the in-situ silylation process.
ZHANG Zhihua,WANG Gang,DU Wei et al. In-situ Silylation Enhances the Performance of TS-1 Immobilized Au Catalyst in Propylene Epoxidation with H2 and O2 [J]. 化学反应工程与工艺, 2020, 36(6): 481-490.
