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

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 re...

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Bibliographic Details
Published in:ChemCatChem 2020-02, Vol.12 (3), p.717-721
Main Authors: Guan, Erjia, Foucher, Alexandre C., Marcella, Nicholas, Shirman, Tanya, Luneau, Mathilde, Head, Ashley R., Verbart, David M. A., Aizenberg, Joanna, Friend, Cynthia M., Stacchiola, Dario, Stach, Eric A., Frenkel, Anatoly I.
Format: Article
Language:English
Subjects:
Ambient temperature
Bimetallic catalysts
Bimetals
Catalysts
Gold
Hydrides
Infrared analysis
Nanoparticles
Palladium
Pd hydride
Pd−Au nanoparticles
Scanning transmission electron microscopy
Selectivity
Silicon dioxide
Spectrum analysis
Surface heterogeneity
X-ray absorption spectroscopy
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Summary: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. Isolated or contiguous: STEM‐EDS and EXAFS of Pd25Au75 nanoparticles supported on RCT SiO2. Contiguous Pd assembles on the surface of the bimetallic nanoparticles expand upon H2 exposure at room temperature.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.201901847