Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Surface chemical reactions I
O 49.3: Vortrag
Mittwoch, 24. März 2010, 11:00–11:15, H42
Adsorption and thermal behaviour of ethane and ethene on oxygen precovered Ni(111) — •Michael Peter Andreas Lorenz1, Thomas Fuhrmann1, Karin Gotterbarm1, Regine Streber1, Fabian Bebensee1, Christian Papp1, Reinhard Denecke2, and Hans-Peter Steinrück1 — 1Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen — 2Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig
Ni as well as NiO are widely-used catalysts in chemical industry. To understand the adsorption and reaction properties of small hydrocarbons on such surfaces we studied ethane and ethene on clean and oxygen precovered Ni(111) by means of XPS using synchrotron radiation at BESSY II. The gases were dosed using a supersonic molecular beam; for C2H6 this provided the kinetic energy required for the activated adsorption yielding adsorbed C2H5. On clean Ni(111) both C2H5 and C2H4 give rise to two separate C 1s peaks, indicative of a different local environment for the two C atoms in both cases. In contrast, on oxygen precovered Ni(111) only one C 1s peak is observed after exposing the surface to C2H4, and for C2H5 the peak separation is strongly reduced, indicating major changes in the adsorption geometries. Furthermore, we also studied the thermal evolution of the adsorbed hydrocarbons and found significant differences between oxygen free and oxygen precovered Ni(111).
This work was supported by BMBF (05 ES3XBA/5) and the DFG through the Cluster of Excellence ”Engineering of Advanced Materials”.