Evidence for Molecularly Chemisorbed Oxygen on TiO2 Supported Gold Nanoclusters and Au(111)

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• 作者：James D. Stiehl ; Tae S. Kim ; Sean M. McClure ; and C. Buddie Mullins
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：February 18, 2004
• 年：2004
• 卷：126
• 期：6
• 页码：1606 - 1607
• 全文大小：40K
• 年卷期：v.126,no.6(February 18, 2004)
• ISSN：1520-5126

文摘

In this study, we present evidence for the existence of a molecularly chemisorbed oxygen species on a Au/TiO₂ model catalyst and a Au(111) single crystal following exposure of these samples to an oxygen plasma-jet molecular beam. We present evidence for the molecularly chemisorbed oxygen species from thermal desorption, collision-induced desorption, and heat of adsorption/reaction-induced desorption measurements. Thermal desorption measurements reveal a peak desorption temperature at ~145 K which corresponds to an activation energy for desorption of ~0.35 eV.