Dynamic Electronic Structure of a Au/TiO2 Catalyst under Reaction Conditions

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• 作者：Elizabeth A. Willneff ; Simon Braun ; Dirk Rosenthal ; Hendrik Bluhm ; Michael H&auml ; vecker ; Evgenyi Kleimenov ; Axel Knop-Gericke ; Robert Schlö ; gl ; Sven L. M. Schroeder
• 刊名：Journal of the American Chemical Society
• 出版年：2006
• 出版时间：September 20, 2006
• 年：2006
• 卷：128
• 期：37
• 页码：12052 - 12053
• 全文大小：51K
• 年卷期：v.128,no.37(September 20, 2006)
• ISSN：1520-5126

文摘

The electronic structure of a highly active Au/TiO₂ powder catalyst was probed in situ by synchrotron X-ray photoelectron spectroscopy (XPS) in the 10^-1 mbar range. The electronic structure of the Au component was found to respond sensitively to changes in temperature and indicated the absence of bulklike metallic Au under the conditions of highest catalytic activity. Concurrent modification of interfacial sites adjacent to Au on the TiO₂ support was not evident from the Ti photoemission, but may have been below the detection limit of XPS.