Atomic origins of the strong metal-support interaction in silica supported catalysts.

Silica supported metal catalysts are most widely used in the modern chemical industry because of the high stability and tunable reactivity. The strong metal-support interaction (SMSI), which has been widely observed in metal oxide supported catalysts and significantly affects the catalytic behavior, has been speculated to rarely happen in silica supported catalysts since silica is hard to reduce. Here we revealed at the atomic scale the interfacial reaction induced SMSI in silica supported Co and Pt catalysts under reductive conditions at high temperature using aberration-corrected environmental transmission electron microscopy coupled with electron energy loss spectroscopy. In a Co/SiO system, the amorphous SiO migrated onto the Co surface to form a crystallized quartz-SiO overlayer, and simultaneously an interlayer of Si was generated in-between. The metastable crystalline SiO overlayer subsequently underwent an order-to-disorder transition due to the continuous dissociation of SiO and the interfacial alloying of Si with the underlying Co. The SMSI in the Pt-SiO system was found to remarkably boost the catalytic hydrogenation. These findings demonstrate the universality of the SMSI in oxide supported catalysts, which is of general importance for designing catalysts and understanding catalytic mechanisms.