# CO Oxidation on Planar Au/TiO$_{2}$ Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study

Diemant, Thomas; Bansmann, Joachim

##### Abstract:
The oxidation of CO on planar Au/TiO$_{2}$ model catalysts was investigated under pressure and temperature conditions similar to those for experiments with more realistic Au/TiO$_{2}$ powder catalysts. The effects of a change of temperature, pressure, and gold coverage on the CO oxidation activity were studied. Additionally, the reasons for the deactivation of the catalysts were examined in long‐term experiments. From kinetic measurements, the activation energy and the reaction order for the CO oxidation reaction were derived and a close correspondence with results of powder catalysts was found, although the overall turnover frequency (TOF) measured in our experiments was around one order of magnitude lower compared to results of powder catalysts under similar conditions. Furthermore, long‐term experiments at 80 °C showed a decrease of the activity of the model catalysts after some hours. Simultaneous in‐situ IR experiments revealed a decrease of the signal intensity of the CO vibration band, while the tendency for the build‐up of side products (e. g. carbonates, carboxylates) of the CO oxidation reaction on the surface of the planar model catalysts was rather low.

 Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU) Publikationstyp Zeitschriftenaufsatz Publikationsdatum 17.03.2021 Sprache Englisch Identifikator ISSN: 1439-4235, 1439-7641 KITopen-ID: 1000130602 Erschienen in ChemPhysChem Verlag Wiley-VCH Verlag Band 22 Heft 6 Seiten 542–552 Vorab online veröffentlicht am 07.01.2021 Nachgewiesen in ScopusWeb of Science
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