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Knut Deppert

Knut Deppert

Professor

Knut Deppert

Reversible formation of a PdCx phase in Pd nanoparticles upon CO and O-2 exposure

Author

  • Olivier Balmes
  • Andrea Resta
  • Didier Wermeille
  • Roberto Felici
  • Maria Messing
  • Knut Deppert
  • Zhi Liu
  • Michael E. Grass
  • Hendrik Bluhm
  • Richard van Rijn
  • Joost W. M. Frenken
  • Rasmus Westerstroem
  • Sara Blomberg
  • Johan Gustafson
  • Jesper N Andersen
  • Edvin Lundgren

Summary, in English

The structure and chemical composition of Pd nanoparticles exposed to pure CO and mixtures of CO and O-2 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 O-2 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.

Department/s

  • Solid State Physics
  • Synchrotron Radiation Research
  • NanoLund

Publishing year

2012

Language

English

Pages

4796-4801

Publication/Series

Physical Chemistry Chemical Physics

Volume

14

Issue

14

Document type

Journal article

Publisher

Royal Society of Chemistry

Topic

  • Atom and Molecular Physics and Optics
  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1463-9084