科研之友
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摘要
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 Ce(4+) -> Ce(3+) transition and Sn(+) ion formation. A corresponding increase of the Ce 4f state occupancy was observed as a giant V resonance enhancement. In the case of powder catalyst a strong CeO(2)-Sn interaction lead to formation of Ce-Sn-O mixed oxide system characterized by Ce(3+) 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.
- 出版日期2008-4
