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CO Oxidation Reaction over Oxygen-Rich Ru(0001) Surfaces
| Content Provider | Semantic Scholar |
|---|---|
| Author | Boettcher, Arnd Niehus, Horst Schwegmann, Sandra Over, Herbert Ertl, Gerhard |
| Copyright Year | 1997 |
| Abstract | The formation of CO2, by exposing oxygen precovered Ru(0001) surfaces to CO, was investigated as a function of the oxygen coverage for sample temperatures up to 900 K. It turned out that the reaction probability per incident CO molecule is below 5 × 10-4 for O coverages up to 3 monolayers (ML); oxygen in excess of 1 ML is located in the subsurface region. The reaction probability for the (1 × 1)-1O phase is in agreement with the data derived from high-pressure experiments by Peden and Goodman [J. Phys. Chem. 1986, 90, 1360]. Even for CO molecules with a translational energy of 1.2 eV (supersonic molecular beam experiments), the reaction probability is less than 5 × 10-2. This value is consistent with the activation barrier derived from DFT calculations for a reaction by direct collision from the gas phase (Eley−Rideal mechanism). Beyond an oxygen load of 3 ML, however, the reaction probability increases by 2 orders of magnitude. It is suggested that this enhancement is due to a further destabilization of ... |
| Starting Page | 11185 |
| Ending Page | 11191 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/jp9726899 |
| Alternate Webpage(s) | http://www1.uni-giessen.de/pci/Homepage_Over/preprints/boettcher1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1021/jp9726899 |
| Volume Number | 101 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
