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

doi:10.1002/cctc.201901847

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 journal › Article › peer-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 language	English
Pages (from-to)	717-721
Number of pages	5
Journal	ChemCatChem
Volume	12
Issue number	3
DOIs	https://doi.org/10.1002/cctc.201901847
State	Published - Feb 6 2020
Externally published	Yes

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.

Funders	Funder number
University of Pennsylvania Materials Research Science and Engineering Center
National Science Foundation	NNCI-1542153
U.S. Department of Energy
Office of Science
Basic Energy Sciences	DE-SC0012573
Brookhaven National Laboratory	DE-SC0012704
Materials Research Science and Engineering Center, Harvard University	DMR-1720530

Keywords

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

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10.1002/cctc.201901847

Cite this

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title = "New Role of Pd Hydride as a Sensor of Surface Pd Distributions in Pd−Au Catalysts",

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.",

keywords = "Bimetallic catalysts, Pd hydride, Pd−Au nanoparticles, Surface heterogeneity, X-ray absorption spectroscopy",

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

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AU - Guan, Erjia

AU - Foucher, Alexandre C.

AU - Marcella, Nicholas

AU - Shirman, Tanya

AU - Luneau, Mathilde

AU - Head, Ashley R.

AU - Verbart, David M.A.

AU - Aizenberg, Joanna

AU - Friend, Cynthia M.

AU - Stacchiola, Dario

AU - Stach, Eric A.

AU - Frenkel, Anatoly I.

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AB - 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.

KW - Bimetallic catalysts

KW - Pd hydride

KW - Pd−Au nanoparticles

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KW - X-ray absorption spectroscopy

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

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

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Keywords

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Replication Data for: New Role of Pd Hydride as a Sensor of Surface Pd Distributions in Pd-Au Catalysts

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