کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5364260 | 1388313 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sn interaction with the CeO2(1Â 1Â 1) system: Bimetallic bonding and ceria reduction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Sn interaction with the CeO2(1Â 1Â 1) system: Bimetallic bonding and ceria reduction Sn interaction with the CeO2(1Â 1Â 1) system: Bimetallic bonding and ceria reduction](/preview/png/5364260.png)
چکیده انگلیسی
A tin layer 0.8 nm thick was deposited onto the CeO2(1 1 1) surface by molecular beam deposition at a temperature of 520 K. The interaction of tin with cerium oxide (ceria) was investigated by X-ray photoelectron spectroscopy (XPS), ultra-violet photoelectron spectroscopy (UPS) and resonant photoelectron spectroscopy (RPES). The strong tin-ceria interaction led to the formation of a homogeneous bulk Ce-Sn-O mixed oxide system. The bulk compound formation is accompanied by partial Ce4+ â Ce3+ reduction, observed as a giant 4f resonance enhancement of the Ce3+ species. CeO2 and SnO2 oxides were formed after oxygen treatment at 520 K. The study proved the existence of strong Ce-Sn interaction and charge transfer from Sn to the Ce-O complex that lead to a weakening of the cerium-oxygen bond, and consequently, to the formation of oxygen deficient active sites on the ceria surface. This behavior can be a key for understanding the higher catalytic activity of the SnOx/CeOx mixed oxide catalysts as compared with the individual pure oxides.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 254, Issue 14, 15 May 2008, Pages 4375-4379
Journal: Applied Surface Science - Volume 254, Issue 14, 15 May 2008, Pages 4375-4379
نویسندگان
M. Å koda, M. Cabala, V. Cháb, K.C. Prince, L. SedláÄek, T. Skála, F. Å utara, V. MatolÃn,