Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Heterogeneous Catalysis

O 13.8: Vortrag

Montag, 25. Februar 2008, 15:45–16:00, HE 101

Reactivity of Nickel on oxide surfaces: evidence of surface oxygen — •Yan-Chun Liu, Heiko Strauß, Andrea Berlich, and Harald Morgner — Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, University of Leipzig, Linnéstraße 2, D-04103 Leipzig

The role of surface and subsurface oxygen during catalytic processes on oxide supported metal catalysts remains a ques-tion of debate in some cases [1,2,3]. Some controversy arises from the difficulties to identify the position of the oxygen. Using Metastable Induced Electron Spectroscopy (MIES) we have been able to identify adsorbed oxygen on top of the metallic Nickel deposits on NiO layers. Furthermore, detailed analysis of the MIE spectra provides evidence of an atomically adsorbed Nickel species. The reactivity of the different Ni adsorbates was evaluated by its reaction with oxygen. Results of the growth of Ni on TiO₂ by MIES are also presented.

[1]D. W. Goodman, C. H. F. Peden and M. S. Chen, CO oxida-tion on ruthenium: The nature of the active catalytic surface. Surface Science 601, L124-L126 (2007).

[2]H. Over, M. Muhler and A. P. Seitsonen, Comment on [1] Surface Science in Press.

[3]D. W. Goodman, C. H. F. Peden and M. S. Chen, Comment on [2] Surface Science in Press