A High Pressure PM-IRRAS Study of CO and O2 Coadsorption and Reactivity on PtSn Alloy Surfaces

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• 作者：Cé ; line Dupont ; David Loffreda ; Franç ; oise Delbecq ; Francisco José ; Cadete Santos Aires ; Eric Ehret ; Yvette Jugnet
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：July 24, 2008
• 年：2008
• 卷：112
• 期：29
• 页码：10862-10867
• 全文大小：245K
• 年卷期：v.112,no.29(July 24, 2008)
• ISSN：1932-7455

文摘

The adsorption of CO on the two terminations, p(2 × 2) and (√3 × √3) R30°, of the bulk Pt₃Sn(111) alloy is studied by high pressure polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS). The influence of O₂ is also investigated. While no differences are observed when CO is chemisorbed alone, the behavior of the two terminations clearly differs in presence of O₂. The presence of oxygen induces modifications on the (√3 × √3)R30° surface. Finally we study how the interaction between O₂ and the surface modifies the reactivity. Hence we show that the p(2 × 2) termination is more efficient than the (√3 × √3) R30° for CO oxidation. However this termination remains more efficient than pure platinum.