Defects in Surface Chemistry—Reductive coupling of Benzaldehyde on Rutile TiO2(110) |
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Authors: | Peter M. Clawin Prof. Cynthia M. Friend Prof. Dr. Katharina Al‐Shamery |
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Affiliation: | 1. Institute for Chemistry, Carl von Ossietzky University of Oldenburg, Carl von Ossietzky Strasse 9–11, 26129 Oldenburg (Germany), Fax: (+49)?441 709 2809;2. Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford St, Cambridge MA, 02138 (USA) |
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Abstract: | The surface chemistry of oxygen and oxygenates on Rutile TiO2(110) is of great interest for various applications such as heterogeneous catalysis and photo catalysis. Though it is generally accepted that surface defects are active sites, the role of subsurface defects is under debate. We have therefore investigated the influence of the bulk defect density on the reductive coupling of benzaldehyde to stilbene as a model system. Using IRRAS we identify stilbene diolate as a reduction intermediate. The concentration of this intermediate is proportional to the bulk defect density, whereas adsorption of benzaldehyde at lower temperatures is not affected, which indicates a dominant role of Ti interstitials at temperatures above 400 K. |
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Keywords: | defect chemistry IR spectroscopy reductive C C coupling surface chemistry titania |
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