Abstract
Pt nanoparticles (NPs) with submonolayer Ag coverage were synthesized and catalytically tested to investigate the effects of surface Ag and NP shape on C2H2 hydrogenation activity and selectivity. Various NP shapes (cubes, cuboctahedra, and octahedra) in the 6–8 nm range were synthesized using colloidal methods with PVP (polyvinylpyrrolidone) as a capping ligand and Ag+ for structure direction. Solid-state 13C NMR of PVP–NP interactions, as well as electrochemical measurements of oxygen evolution reaction (OER) activity, revealed that submonolayer levels of Ag significantly modify both the physical and electronic structure of the Pt NP surface. Octahedral NP catalysts with 0.5 monolayers of Ag were found to be highly selective for C2H2-to-C2H4 hydrogenation (C2H4/C2H6 >8) at reaction rates comparable to total hydrogenation on pure Pt. Traditionally prepared PtAg catalysts synthesized via incipient wetness showed analogously high selectivities but lower site time yields compared to NPs. In contrast, total ...
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