Epitaxial and Strong Support Interactions between Pt and LaFeO3Films Stabilize Pt Dispersion

Xinyu Mao; Alexandre C. Foucher; Tiziano Montini; Eric A. Stach; Paolo Fornasiero; Raymond J. Gorte

doi:10.1021/jacs.0c00138

Epitaxial and Strong Support Interactions between Pt and LaFeO₃Films Stabilize Pt Dispersion

Xinyu Mao, Alexandre C. Foucher, Tiziano Montini, Eric A. Stach, Paolo Fornasiero, Raymond J. Gorte

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

Abstract

The ability to stabilize very small Pt crystallites in supported-metal catalysts following harsh treatments is an important industrial problem. Here, we demonstrate that Pt particles can be maintained in the 1-to 2-nm range following multiple oxidation and reduction cycles at 1073 K when the particles are supported on 0.5-nm LaFeO3 films that have been deposited onto MgAl2O4 using atomic layer deposition. Characterization by scanning transmission electron microscopy suggests that when the catalyst is oxidized at 1073 K, the Pt crystallites are oriented with respect to the underlying LaFeO3. X-ray absorption spectroscopy also shows evidence of changes in the Pt environment. CO-oxidation rates for the reduced catalyst remain unchanged after five redox cycles at 1073 K. Epitaxial growth of Pt clusters and the consequent strong metal-support interaction between Pt and LaFeO3 are suggested to be the main reasons for the enhanced catalytic performances.

Original language	English
Pages (from-to)	10373-10382
Number of pages	10
Journal	Journal of the American Chemical Society
Volume	142
Issue number	23
DOIs	https://doi.org/10.1021/jacs.0c00138
State	Published - Jun 10 2020
Externally published	Yes

Funding

This work was funded by the Department of Energy, Office of Basic Energy Sciences, Chemical Sciences, Geosciences and Biosciences Division, Grant No. DE-FG02-13ER16380. A.C.F. acknowledges the Vagelos Institute for Energy Science and Technology at the University of Pennsylvania for a graduate/postdoctoral fellowship. The authors acknowledge SOLEIL for provision of synchrotron radiation facilities and thank Dr. E. Fonda for technical assistance in using beamline SAMBA. T.M. and P.F. acknowledge the University of Trieste, MIUR (through the FFABR 2017 project), INSTM Consortium, and ICCOM-CNR for financial support.

Funders	Funder number
ICCOM-CNR
INSTM Consortium
Office of Basic Energy Sciences
University of Trieste
Vagelos Institute for Energy Science and Technology
U.S. Department of Energy
University of Pennsylvania
Chemical Sciences, Geosciences, and Biosciences Division	DE-FG02-13ER16380
Ministero dell’Istruzione, dell’Università e della Ricerca

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title = "Epitaxial and Strong Support Interactions between Pt and LaFeO3Films Stabilize Pt Dispersion",

abstract = "The ability to stabilize very small Pt crystallites in supported-metal catalysts following harsh treatments is an important industrial problem. Here, we demonstrate that Pt particles can be maintained in the 1-to 2-nm range following multiple oxidation and reduction cycles at 1073 K when the particles are supported on 0.5-nm LaFeO3 films that have been deposited onto MgAl2O4 using atomic layer deposition. Characterization by scanning transmission electron microscopy suggests that when the catalyst is oxidized at 1073 K, the Pt crystallites are oriented with respect to the underlying LaFeO3. X-ray absorption spectroscopy also shows evidence of changes in the Pt environment. CO-oxidation rates for the reduced catalyst remain unchanged after five redox cycles at 1073 K. Epitaxial growth of Pt clusters and the consequent strong metal-support interaction between Pt and LaFeO3 are suggested to be the main reasons for the enhanced catalytic performances.",

author = "Xinyu Mao and Foucher, {Alexandre C.} and Tiziano Montini and Stach, {Eric A.} and Paolo Fornasiero and Gorte, {Raymond J.}",

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AU - Mao, Xinyu

AU - Foucher, Alexandre C.

AU - Montini, Tiziano

AU - Stach, Eric A.

AU - Fornasiero, Paolo

AU - Gorte, Raymond J.

PY - 2020/6/10

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N2 - The ability to stabilize very small Pt crystallites in supported-metal catalysts following harsh treatments is an important industrial problem. Here, we demonstrate that Pt particles can be maintained in the 1-to 2-nm range following multiple oxidation and reduction cycles at 1073 K when the particles are supported on 0.5-nm LaFeO3 films that have been deposited onto MgAl2O4 using atomic layer deposition. Characterization by scanning transmission electron microscopy suggests that when the catalyst is oxidized at 1073 K, the Pt crystallites are oriented with respect to the underlying LaFeO3. X-ray absorption spectroscopy also shows evidence of changes in the Pt environment. CO-oxidation rates for the reduced catalyst remain unchanged after five redox cycles at 1073 K. Epitaxial growth of Pt clusters and the consequent strong metal-support interaction between Pt and LaFeO3 are suggested to be the main reasons for the enhanced catalytic performances.

AB - The ability to stabilize very small Pt crystallites in supported-metal catalysts following harsh treatments is an important industrial problem. Here, we demonstrate that Pt particles can be maintained in the 1-to 2-nm range following multiple oxidation and reduction cycles at 1073 K when the particles are supported on 0.5-nm LaFeO3 films that have been deposited onto MgAl2O4 using atomic layer deposition. Characterization by scanning transmission electron microscopy suggests that when the catalyst is oxidized at 1073 K, the Pt crystallites are oriented with respect to the underlying LaFeO3. X-ray absorption spectroscopy also shows evidence of changes in the Pt environment. CO-oxidation rates for the reduced catalyst remain unchanged after five redox cycles at 1073 K. Epitaxial growth of Pt clusters and the consequent strong metal-support interaction between Pt and LaFeO3 are suggested to be the main reasons for the enhanced catalytic performances.

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Epitaxial and Strong Support Interactions between Pt and LaFeO₃Films Stabilize Pt Dispersion

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