Abstract
Pd Pt alloy catalysts were prepared by anchoring Pd(II) and Pt(II) organometallic species to the support surface, followed by H 2 reduction under mild conditions. This preparation method was exploited for the synthesis of Pd Pt catalysts having different Pd Pt ratios and with total metal loading ~2%; pure Pd and pure Pt catalysts were also obtained. Small Angle X-ray Scattering (SAXS) analysis was used to determine metal dispersion: average metal particle diameter was in the range 20–40 Å both for alloy and single Pd and Pt catalysts. The occurrence of Pd Pt alloy formation was demonstrated by Wide Angle X-ray Scattering (WAXS) and Radial Distribution Function (RDF) analyses. Results both from WAXS and RDF are consistent with each other in ascertaining alloy occurrence, also providing a detailed picture of the behavior of Pt, Pd, and Pd Pt systems in the presence of H 2.
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