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New Role of Pd Hydride as a Sensor of Surface Pd Distributions in Pd−Au Catalysts
Author(s) -
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.
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201901847
Subject(s) - bimetallic strip , hydride , catalysis , palladium , infrared spectroscopy , materials science , transmission electron microscopy , palladium hydride , nanoparticle , selectivity , spectroscopy , chemistry , inorganic chemistry , nanotechnology , metal , organic chemistry , metallurgy , physics , quantum mechanics
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 H 2 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 (Pd 25 Au 75 ) 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.