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 H-2 and O-2. The In promotion could effectively enhance the reactivity and stability of the catalysts. A PO formation rate of 56 g(PO)h(-1) kg(cat)(-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 g(PO)h(-1) kg(cat)(-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. (C) 2012 Elsevier B.V. All rights reserved.