New Role of Pd Hydride as a Sensor of Surface Pd Distributions in Pd−Au Catalysts

Citation:

Guan E, Foucher AC, Marcella N, Shirman T, Luneau M, Head AR, Verbart DMA, Aizenberg J, Friend CM, Stacchiola D, et al. New Role of Pd Hydride as a Sensor of Surface Pd Distributions in Pd−Au Catalysts. ChemCatChemChemCatChemChemCatChem. 2020;12 (3) :717 - 721.

Date Published:

2020

Abstract:

Abstract Isolated or contiguous, the surface distributions of Pd atoms in the Pd?Au bimetallic nanoparticle (NP) catalysts often influence activity and selectivity towards specific reactions. In this study, we used a concomitant Pd hydride formation upon H2 exposure as a probe of presence of contiguous Pd regions in bimetallic NPs. For demonstrating this method, we prepared silica supported monometallic Pd and bimetallic Pd?Au NPs with a Pd/Au ratio of 25/75 (Pd25Au75) and used X-ray absorption spectroscopy, scanning transmission electron microscopy and infrared spectroscopy to detect and quantitatively analyze the Pd hydride regions. This work provides a new approach to characterizing intra-particle heterogeneities within the bimetallic NPs at ambient temperature and pressure.