Journal article
Dissociation of CO and formation of carbonate on a stepped, K-modified Cu(115) surface
Fysisk Institut, Odense University, DK-5230 Odense M, Denmark1
Institute for Physics and Astronomy, Aarhus University, DK-8000 Århus, Denmark2
Institute of Experimental Physics, University of Wroclaw, Wroclaw, Poland3
Sincrotrone Trieste, S.C.p.S., Strada Statale per Basovizza 14 km 163.5, I-34012 Trieste, Italy4
Department of Physics, University of Sarajevo, Zmaja od Bosna 35, Sarajevo, Bosnia & Hercegovina5
Dipartimento di Fisica, Universita' di Trieste, via Valerio 2, I-34127 Trieste and Laboratorio TASC-INFM, S.S. 14 Km. 163.5, I-34012 Trieste, Italy6
It is demonstrated that CO dissociates on a potassium-modified Cu(115) surface at 125 K. The dissociation process is conditioned by both the presence of steps and an alkali metal coverage in the range of 0.4<θK<1 ML. Carbonate is formed at 220 K via the Boudouard process CO+CO→CO2+C and reaction with oxygen.
Further annealing to 470 K results in decomposition of the carbonate with graphitic C and O atoms left on the surface. The evidence comes from synchrotron radiation-based measurements of the valence band electron energy distributions and high-resolution measurements of the K, C, and O core levels.
| Language: | English |
|---|---|
| Year: | 2000 |
| Pages: | 247-254 |
| ISSN: | 18734448 and 00092614 |
| Types: | Journal article |
| DOI: | 10.1016/S0009-2614(00)00433-4 |
