Self-Regeneration of Pd鈥揕aFeO3 Catalysts: New Insight from Atomic-Resolution Electron Microscopy

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• 作者：Michael B. Katz ; George W. Graham ; Yingwen Duan ; Hong Liu ; Carolina Adamo ; Darrell G. Schlom ; Xiaoqing Pan
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：November 16, 2011
• 年：2011
• 卷：133
• 期：45
• 页码：18090-18093
• 全文大小：819K
• 年卷期：v.133,no.45(November 16, 2011)
• ISSN：1520-5126

文摘

Aberration-corrected transmission electron microscopy was used to study atomic-scale processes in Pd鈥揕aFeO₃ catalysts. Clear evidence for diffusion of Pd into LaFeO₃ and out of LaFe_0.95Pd_0.05O_{3鈭捨?/sub> under high-temperature oxidizing and reducing conditions, respectively, was found, but the extent to which these processes occurred was quite limited. These observations cast doubt that such phenomena play a significant role in a postulated mechanism of self-regeneration of this system as an automotive exhaust-gas catalyst.}