The Construction of Au–Fe–TS-1 Interface Coupling Structure for Improving Catalytic Performance of Propylene Epoxidation with H2 and O2.

The gas-phase propylene epoxidation for noble metal system as a green process has confronted a great challenging task in metal utilization and stability. In this work, we realize the enhancement of Au capture efficiency and high-dispersed Au nanoparticles by supports modification and interfacial regulation to construct Au–Fe–TS-1 interface coupling structure. The Au capture efficiency of the optimum catalyst arrived at 69% and it displayed a 7.3% C₃H₆ conversion with a PO selectivity of 89.9%, giving a H₂ efficiency of about 25.7%. Then some typical characterizations systematically elucidate that Fe is not only incorporated into TS-1 framework and captures Au species with high dispersion and stability, but also inhibits the losing of Ti species. Furthermore, Fe-modified catalysts change the property of Au active site and maintain lower apparent activation energy. This report may provide a new strategy to design advanced catalysts for enhancing metal utilization efficiency by the construction of interface coupling structure. [ABSTRACT FROM AUTHOR]