Electroless deposition (ED) is an industrially feasible method for the preparation of bimetallic catalysts wherein a metal salt is reduced from solution onto an existing metal site through a kinetically-controlled catalytic or autocatalytic process. A series of Ag-Pt/SiO₂ catalysts have been prepared by the ED of Ag⁺ from solution. FTIR of chemisorbed ¹²CO and ¹³CO indicate that the Ag in these catalysts is preferentially located on the Pt(111) sites for low dispersion (3-4%) Pt/SiO₂ catalysts. Silver placement on high dispersion Pt/SiO₂ catalysts has also been also studied and will be discussed. These catalysts have been evaluated for the hydrogenation of 3,4-epoxy-butene (EpB), a multi-functional olefin. Although Ag/SiO₂ is inactive for this reaction, the addition of Ag to Pt/SiO₂ significantly (~3x) enhances the overall EpB hydrogenation conversion and the selectivity to the saturated epoxide, epoxybutane. This effect of increased activity by Ag addition was not observed for propylene hydrogenation. Based on kinetic studies, the enhanced catalytic activity appears to result from a Ag-related decrease in the strength of EpB adsorption on the Pt surface. The nature of the Ag-Pt interactions will be discussed using data from EXAFS, XPS, FTIR, and detailed kinetic studies.