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

Shuyi Zhang, Chen Chen, Matteo Cargnello, Paolo Fornasiero, Raymond J. Gorte, George W. Graham and Xiaoqing Pan ()
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Shuyi Zhang: University of Michigan
Chen Chen: University of Pennsylvania
Matteo Cargnello: University of Pennsylvania
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

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8778

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DOI: 10.1038/ncomms8778

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