Kinetic and spectroscopic investigations to elucidate the mechanisms of CO oxidation over Ru and Au catalysts
- The oxidation of CO over polycrystalline \(RuO_{2}\) powder was studied at ambient pressure in the temperature range from 363 to 453 K. Reaction orders with respect to CO and oxygen were determined. Using temperature-programmed reduction (TPR) and desorption (TPD) techniques subsequent to steady state CO oxidation, the most active and stable state of the unsupported Ru catalysts was identified as an ultra-thin \(RuO_{2}\) layer covering a metallic Ru core. Furthermore, employing \(\textit {in situ}\) diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements, the structural changes of Ru/MgO and \(Ru/SiO_{2}\) catalysts during the oxidation of CO were probed. Thus, by comparing the present results with single crystal data, it was possible to bridge both the pressure and the materials gap. The oxidation of CO over \(Au/TiO_{2}\) and \(Au/Fe_{2}O_{3}\) catalysts was also investigated. Based on DRIFTS results an active state of the gold catalysts under reaction conditions was identified as metallic gold species.
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| Author: | Vijay Sopan NarkhedeGND |
|---|---|
| URN: | urn:nbn:de:hbz:294-16301 |
| Referee: | Martin MuhlerORCiDGND, Wolfgang GrünertGND |
| Document Type: | Doctoral Thesis |
| Language: | English |
| Date of Publication (online): | 2006/06/22 |
| Date of first Publication: | 2006/06/22 |
| Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
| Granting Institution: | Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie |
| Date of final exam: | 2006/05/19 |
| Creating Corporation: | Fakultät für Chemie und Biochemie |
| GND-Keyword: | Ruthenium; Kohlenmonoxid; Oxidation; Desorption / Temperaturprogrammierung; Drift |
| Institutes/Facilities: | Lehrstuhl für Technische Chemie |
| Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Chemie, Kristallographie, Mineralogie |
| faculties: | Fakultät für Chemie und Biochemie |
| Licence (German): |  Keine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht |
