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

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.

• Författare: 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
• Avdelning/ar: Fasta tillståndets fysik; Synkrotronljusfysik; NanoLund: Centre for Nanoscience
• Publiceringsår: 2012
• Språk: Engelska
• Sidor: 4796-4801
• Publikation/Tidskrift/Serie: Physical Chemistry Chemical Physics
• Volym: 14
• Issue: 14
• Länkar: http://dx.doi.org/10.1039/c2cp22873d
• Dokumenttyp: Artikel i tidskrift
• Förlag: Royal Society of Chemistry
• Ämne: Atom and Molecular Physics and Optics; Condensed Matter Physics
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 1463-9084