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High Energy Surface X-ray Diffraction Applied to Catalytic CO Oxidation over Rh(100) and Rh(111)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hagman, Benjamin |
| Copyright Year | 2014 |
| Abstract | We have studied the surface oxide created on Rh(100) and Rh(111) when exposed to a gas mixture of CO and O2 at high pressures. The study of the oxide surface have been in comparison with already published result of the oxide surface created on the same surfaces but with only O2 in the gas. The analysis has mainly been qualitative but some quantitative analysis have also been conducted. The results for Rh(100) give a surface oxide structure of c(8x2). The surface oxide have a slightly distorted hexagonal pattern. The result for Rh(111) is a overlayer structure of (8x8). The surface oxide is also hexagonal for Rh(111) with a lattice parameter of 3.07 A. The oxide is then qualitatively the same as when the surface is exposed to pure O2 for Rh(100). But the surface oxide is not the same for Rh(111) between the two cases. When Rh(111) is exposed to pure O2 the surface oxide is (9x9), a hexagonal pattern with a lattice parameter of 3.02 A. The explanation of this is that when the surface is exposed to pure O2 more oxygen is forced down on the surface which forces the surface oxide to shrink. The quantitative analysis has not been completed yet. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://lup.lub.lu.se/luur/download?fileOId=4755260&func=downloadFile&recordOId=4755257 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
