Metal-support interaction and redox behavior of Pt(1 wt %)/Ce0.6Zr0.4O2

The Journal of Physical Chemistry. B
Giulio DeganelloAlessandro Longo

Abstract

The catalyst Pt(1 wt %)/Ce(0.6)Zr(0.4)O(2) is studied by CO-temperature programmed reduction (CO-TPR), isothermal oxygen storage complete capacity (OSCC), X-ray absorption spectroscopy (XAS) at the Pt L(III) edge, and in situ X-ray diffraction (in situ XRD), with the aim of elucidating the role of supported metal in CO oxidation by ceria-based three-way catalysts (TWC). The redox behavior of Pt(1 wt %)/Ce(0.6)Zr(0.4)O(2) is compared to that of bare ceria-zirconia. OSCC of redox-aged Pt/ceria-zirconia is twice that of bare ceria-zirconia, and the maximum of CO consumption occurs at a temperature about 300 K lower than redox-aged ceria-zirconia. XAS analysis allows one to evidence the formation of a platinum-cerium alloy in redox-aged samples and the stability of the metal particles toward oxidation and sintering during high-temperature treatments. Under CO flux at 773 K, bare ceria-zirconia shows a continuous drift of diffraction peaks toward smaller Bragg angles, due to a progressive increase of Ce(III) content. Under the same treatment, the structural rearrangement of Pt-supported ceria-zirconia starts after an induction time and takes place with an abrupt change of the lattice constant. The experimental evidence points to the...Continue Reading

References

Dec 1, 1995·Physical Review. B, Condensed Matter·A FilipponiC R Natoli
Feb 28, 2003·Journal of Synchrotron Radiation·A MartoranaS Mobilio
Jul 5, 2003·Science·Qi FuMaria Flytzani-Stephanopoulos
Jun 22, 2005·Journal of Synchrotron Radiation·Alessandro LongoAntonino Martorana

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