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Dynamic structural evolution of supported palladium–ceria core–shell catalysts revealed by in situ electron microscopy

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  • Shuyi Zhang

    (University of Michigan
    University of California—Irvine)

  • Chen Chen

    (University of Pennsylvania)

  • Matteo Cargnello

    (University of Pennsylvania
    Present address: Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA)

  • Paolo Fornasiero

    (ICCOM-CNR Trieste Research Unit and INSTM, University of Trieste)

  • Raymond J. Gorte

    (University of Pennsylvania)

  • George W. Graham

    (University of Michigan)

  • Xiaoqing Pan

    (University of Michigan
    University of California—Irvine
    University of California—Irvine)

Abstract

The exceptional activity for methane combustion of modular palladium–ceria core–shell subunits on silicon-functionalized alumina that was recently reported has created renewed interest in the potential of core–shell structures as catalysts. Here we report on our use of advanced ex situ and in situ electron microscopy with atomic resolution to show that the modular palladium–ceria core–shell subunits undergo structural evolution over a wide temperature range. In situ observations performed in an atmospheric gas cell within this temperature range provide real-time evidence that the palladium and ceria nanoparticle constituents of the palladium–ceria core–shell participate in a dynamical process that leads to the formation of an unanticipated structure comprised of an intimate mixture of palladium, cerium, silicon and oxygen, with very high dispersion. This finding may open new perspectives about the origin of the activity of this catalyst.

Suggested Citation

  • Shuyi Zhang & Chen Chen & Matteo Cargnello & Paolo Fornasiero & Raymond J. Gorte & George W. Graham & Xiaoqing Pan, 2015. "Dynamic structural evolution of supported palladium–ceria core–shell catalysts revealed by in situ electron microscopy," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8778
    DOI: 10.1038/ncomms8778
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