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Issue 14, 2012
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Reversible formation of a PdCx phase in Pd nanoparticles upon CO and O2 exposure

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Abstract

The structure and chemical composition of Pd nanoparticles exposed to pure CO and mixtures of CO and O2 at elevated temperatures have been studied in situ by a combination of X-ray Diffraction and X-ray Photoelectron Spectroscopy in pressures ranging from ultra high vacuum to 10 mbar and from room temperature to a few hundred degrees celsius. Our investigation shows that under CO exposure, above a certain temperature, carbon dissolves into the Pd particles forming a carbide phase. Upon exposure to CO and O2 mixtures, the carbide phase forms and disappears reversibly, switching at the stoichiometric ratio for CO oxidation. This finding opens new scenarios for the understanding of catalytic oxidation of C-based molecules.

Graphical abstract: Reversible formation of a PdCx phase in Pd nanoparticles upon CO and O2 exposure

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Publication details

The article was received on 09 Sep 2011, accepted on 09 Feb 2012 and first published on 24 Feb 2012


Article type: Paper
DOI: 10.1039/C2CP22873D
Citation: Phys. Chem. Chem. Phys., 2012,14, 4796-4801
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    Reversible formation of a PdCx phase in Pd nanoparticles upon CO and O2 exposure

    O. Balmes, A. Resta, D. Wermeille, R. Felici, M. E. Messing, K. Deppert, Z. Liu, M. E. Grass, H. Bluhm, R. V. Rijn, J. W. M. Frenken, R. Westerström, S. Blomberg, J. Gustafson, J. N. Andersen and E. Lundgren, Phys. Chem. Chem. Phys., 2012, 14, 4796
    DOI: 10.1039/C2CP22873D

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