A resonant photoelectron spectroscopy study of Sn(Ox) doped CeO2 catalysts

Abstract

The interaction of tin with cerium oxide thin film and cerium oxide nanosized powder was studied using XPS and resonant photoelectron spectroscopy (RPES) in the Ce 4d-4f photoabsorption region. A strong tin -ceria interaction led to partial Ce4+ → Ce3+ transition and Sn + ion formation. A corresponding increase of the Ce 4f state occupancy was observed as a giant 4f resonance enhancement. In the case of powder catalyst a strong CeO2-Sn interaction lead to formation of Ce-Sn-O mixed oxide system characterized by Ce3+ ion concentration enhancement and increase of Ce 4f occupation. It explains generally higher catalytic activity of the Ce-Sn-O mixed oxide catalysts when comparing with the individual oxides. Copyright © 2008 John Wiley & Sons, Ltd.