Direct propylene epoxidation with H2 and O2 over In modified Au/TS-1 catalysts

A series of In promoted Au/TS-1 catalysts was prepared and tested for direct propylene epoxidation with H2 and O2. The In promotion could effectively enhance the reactivity and stability of the catalysts. A PO formation rate of 56 gPO h− 1 kgcat− 1 was obtained over a 0.57Au/0.4In-TS-1 catalyst, which was about 80% enhancement compared to an un-promoted 0.25Au/TS-1 catalyst (32 gPO h− 1 kgcat− 1). The enhancement was due to a higher Au capture efficiency by the modification of In on the TS-1 surface, and a higher dispersion of Au species in the catalyst.

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► In-promoted Au/TS-1 are effective for direct propylene epoxidation with H2 and O2.
► The enhancement was due to higher Au capture efficiency in the promoted catalysts.
► Smaller Au particles in the promoted catalysts were beneficial for the reactivity.
► The In-promoted catalyst was more stable than the unpromoted sample.