Propylene epoxidation over biogenic Au/TS-1 catalysts by Cinnamomum camphora extract in the presence of H2 and O2

Au/TS-1 catalysts with different Au nanoparticles (NPs) sizes ranging from 3.1 to 8.4 nm but the same Au loading of 0.5 wt% were prepared through changing the concentration of Cinnamomum camphora leaves extract. Smaller Au NPs are the dominant active sites. There is no decreasing in both the activity and the PO selectivity for the Au/TS-1 catalysts after reaction of 100 h.