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CO Oxidation on Planar Au/TiO(2) Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study
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 st...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8048944/ https://www.ncbi.nlm.nih.gov/pubmed/33411392 http://dx.doi.org/10.1002/cphc.202000960 |
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author | Diemant, Thomas Bansmann, Joachim |
author_facet | Diemant, Thomas Bansmann, Joachim |
author_sort | Diemant, Thomas |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-8048944 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-80489442021-04-20 CO Oxidation on Planar Au/TiO(2) Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study Diemant, Thomas Bansmann, Joachim Chemphyschem Articles 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. John Wiley and Sons Inc. 2021-02-11 2021-03-17 /pmc/articles/PMC8048944/ /pubmed/33411392 http://dx.doi.org/10.1002/cphc.202000960 Text en © 2021 The Authors. ChemPhysChem published by Wiley-VCH GmbH https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
spellingShingle | Articles Diemant, Thomas Bansmann, Joachim CO Oxidation on Planar Au/TiO(2) Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study |
title | CO Oxidation on Planar Au/TiO(2) Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study |
title_full | CO Oxidation on Planar Au/TiO(2) Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study |
title_fullStr | CO Oxidation on Planar Au/TiO(2) Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study |
title_full_unstemmed | CO Oxidation on Planar Au/TiO(2) Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study |
title_short | CO Oxidation on Planar Au/TiO(2) Model Catalysts under Realistic Conditions: A Combined Kinetic and IR Study |
title_sort | co oxidation on planar au/tio(2) model catalysts under realistic conditions: a combined kinetic and ir study |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8048944/ https://www.ncbi.nlm.nih.gov/pubmed/33411392 http://dx.doi.org/10.1002/cphc.202000960 |
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