Identification of the Structural Phases of CexZr1−xO2 by Eu(III) Luminescence Studies

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• 作者：Tiziano Montini ; Adolfo Speghini ; Loredana De Rogatis ; Barbara Lorenzut ; Marco Bettinelli ; Mauro Graziani ; Paolo Fornasiero
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：September 16, 2009
• 年：2009
• 卷：131
• 期：36
• 页码：13155-13160
• 全文大小：273K
• 年卷期：v.131,no.36(September 16, 2009)
• ISSN：1520-5126

文摘

Despite the wide application of ceria-zirconia based materials in Three Way Catalysts (TWCs), Solid Oxides Fuel Cells (SOFCs), and H₂ production and purification reactions, an active debate is still open on the correlation between their structure and redox/catalytic performances. Existing reports support the need of either (i) a homogeneous solid solution or (ii) materials with nanoscale heterogeneity to obtain high activity and stability. Here we report on a simple and inexpensive approach to solve this problem taking advantage of the luminescence properties of Eu(III), used as a structural probe introduced either in the bulk or on the surface of the samples. In this way, the real structure of ceria-zirconia materials can be revealed even for amorphous high surface area samples. Formation of small domains is observed in catalytically important metastable samples which appear homogeneous by conventional XRD.