期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 113, 期 46, 页码 20020-20028出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp907844j
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资金
- U.S. Department of Energy Office of Basic Energy Sciences, Chemical Sciences Division
- Robert A. Welch Foundation [F-0032]
- National Science Foundation [CHE-0412609]
- W. R. Wiley Environmental Molecular Science Laboratory
- Department of Energy's Office of Biological and Environmental Research located at Pacific Northwest National Laboratory (PNNL)
We report on the reactivity of a FeO(111) monolayer grown on Pt(111) toward aliphatic alcohols. Using a combination of temperature-programmed desorption, infrared reflection-absorption spectroscopy, and scanning tunneling microscopy techniques, we show that the alcohols dissociate primarily at FeO(111) step edges and their oxidation leads to the removal of the FeO(111) film. Upon annealing, FeO(111) lattice oxygen is incorporated into the reaction products, and reduced iron left behind dissolves into the underlying Pt(111) substrate. Ethanol is employed in a more detailed spectroscopic study to follow the reaction products and surface intermediates as the removal of FeO(111) proceeds. The ethoxy species formed upon dissociative adsorption of ethanol at the FeO(111) step edges undergo partial oxidation to acetaldehyde and a complete oxidation to CO and H2O. Other products, CH4 and H-2, associated with the reactions occurring oil Pt(111) are also observed as the bare Pt(111) surface appears. A similar etching process was also observed for n-decane.
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