Abstract
Bimetallic Pt-Au/SiO 2 catalysts were prepared by reduction of AuC1 − 4 using hydrogen preadsorbed on a parent monometallic Pt/SiO 2 catalyst. In fact during that preparation a direct redox reaction can occur between the reduced platinum and AuCl − 4. At low gold coverage the additive is deposited statistically on the whole surface of platinum particles (the reducer is H preadsorbed on Pt). At high gold coverage the additive is preferentially deposited on the high index planes of platinum particles (by direct redox reaction). During the formation of Pt-Au bimetallic entities sintering of platinum can occur as a result of simultaneous oxidation and reduction of platinum.
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