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Microwave-Assisted Synthesis Of PdxAu100–x Alloy Nanoparticles: A Combined Experimental And Theoretical Assessment Of Synthetic And Compositional Effects Upon Catalytic Reactivity
P. Kunal, H. Li, Beth L. Dewing, L. Zhang, K. Jarvis, G. Henkelman, S. M. Humphrey
Published 2016 · Chemistry
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PdxAu100–x nanoparticle (NP) catalysts with well-defined morphologies and compositions can be rapidly prepared using a simple microwave-assisted synthetic approach. Common Pd(II) and Au(III) precursors are coreduced in ethylene glycol to give small and nearly monodisperse (2.5 ± 0.6 nm) NPs with homogeneously alloyed structures in less than 300 s at 150 °C. A comparison of the nucleation and growth processes responsible for the formation of PdAuNPs by microwave and conventional methods revealed faster and more reproducible product formation under microwave-assisted heating. Pd-rich NPs were rapidly formed, into which Au atoms were subsequently incorporated to give the alloyed NPs. The value of x in the PdxAu100–xNPs obtained can be finely controlled, allowing the surface electronic structure of the NPs to be broadly tuned. This permits model heterogeneous reaction studies, in which catalytic reactivity can be directly related to Pd:Au composition. Vapor-phase alkene hydrogenation studies using a series of...
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