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Modulation Excitation X-Ray Absorption Spectroscopy to Probe Surface Species on Heterogeneous Catalysts

Ferri, Davide ; Newton, Mark ; Nachtegaal, Maarten

In: Topics in Catalysis, 2011, vol. 54, no. 16-18, p. 1070-1078

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    Titre
    • Modulation Excitation X-Ray Absorption Spectroscopy to Probe Surface Species on Heterogeneous Catalysts
    Auteur
    • Ferri, Davide. Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland
    • Newton, Mark. European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, 38043, Grenoble, France
    • Nachtegaal, Maarten. Paul Scherrer Institute, 5232, Villigen, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Topics in Catalysis, 2011, vol. 54, no. 16-18, p. 1070-1078. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:319835
    Summary
    The advantages and open questions of the combination of modulation excitation spectroscopy and phase sensitive detection (PSD) with X-ray absorption spectroscopy (XAS) for the analysis of heterogeneous catalysts at work are reviewed. The characteristic spectral signatures of two different edges (Pd K and Pt L3) are described in relation to the red-ox chemistry of Pd/Al2O3 and Pt/Al2O3 with respect to NO reduction by CO and CO oxidation, respectively. Both examples demonstrate that PSD makes XAS sensitive to potentially active species for the catalytic reaction