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

Erjia Guan, Alexandre C. Foucher, Nicholas Marcella, Tanya Shirman, Mathilde Luneau, Ashley R. Head, David M.A. Verbart, Joanna Aizenberg, Cynthia M. Friend, Dario Stacchiola, Eric A. Stach, Anatoly I. Frenkel

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

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.

Original languageEnglish
Pages (from-to)717-721
Number of pages5
JournalChemCatChem
Volume12
Issue number3
DOIs
StatePublished - Feb 6 2020
Externally publishedYes

Funding

The work was supported as part of the Integrated Mesoscale Architectures for Sustainable Catalysis (IMASC), an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences under Award No. DE-SC0012573. This research used 8-ID (ISS) beamline of the National Synchrotron Light Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory (BNL) under Contract No. DE-SC0012704. TEM was performed at the Singh Center for Nanotechnology at the University of Pennsylvania, a member of the National Nanotechnology Coordinated Infrastructure (NNCI) network, which is supported by the National Science Foundation (Grant NNCI-1542153). These facilities were also supported in part by the NSF through the University of Pennsylvania Materials Research Science and Engineering Center (MRSEC) (DMR-1720530). This research used resources of the Center for Functional Nanomaterials, which is a U.S. DOE Office of Science Facility, at BNL under Contract No. DE-SC0012704.

FundersFunder number
University of Pennsylvania Materials Research Science and Engineering Center
National Science FoundationNNCI-1542153
U.S. Department of Energy
Office of Science
Basic Energy SciencesDE-SC0012573
Brookhaven National LaboratoryDE-SC0012704
Materials Research Science and Engineering Center, Harvard UniversityDMR-1720530

    Keywords

    • Bimetallic catalysts
    • Pd hydride
    • Pd−Au nanoparticles
    • Surface heterogeneity
    • X-ray absorption spectroscopy

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