Preparation and characterization of a model system for the study of monolayers and multilayers of vanadia supported on titania |
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Authors: | J. Nickl R. Schlögl A. Baiker H. Knözinger G. Ertl |
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Affiliation: | (1) Fritz Haber Institut der Max Planck Gesellschaft, D-1000 Berlin 33, West Germany;(2) Department of Industrial and Engineering Chemistry, Swiss Federal Institute of Technology, ETH-Zentrum, CH-8092 Zürich, Switzerland;(3) Institute for Physical Chemistry, University Munich, D-8000 Munich 2, West Germany |
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Abstract: | A model system for the study of structural and chemical properties of monolayers and multilayers of vanadium oxide immobilized on titania is presented. Investigation of the planar oxide-oxide interface by XP, UV and IS spectroscopy indicated that vanadium immobilized by a single impregnation step exists as an incomplete heterogeneous layer containing well dispersed V4+ species. Increase of the vanadia loading by multiple impregnations led to vanadia agglomerates with higher apparent oxidation state of the vanadium. TD spectroscopy with O2 and CO2 as probe molecules revealed that the chemical reactivity of the vanadia surface species depends on their structure. The surface containing well-dispersed vanadia species exchanged oxygen more easily and showed pronounced interactions with CO2. |
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Keywords: | Vanadium oxide titania model oxide-oxide interface |
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