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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.18: Poster

Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F

Homogeneous and front-induced surface transformations during catalytic oxidation of ammonia over Pt(1 0 0) — •Florian Lovis¹, Matias Rafti², Yingfeng Zeng¹, and Ronald Imbihl¹ — ¹Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universitat Hannover, Callinstr. 3-3a, D-30167 Hannover, Germany — ²INIFTA, Dto. de Química, Fac. de Cs. Exactas, Universidad Nacional de La Plata, Diag. 113 y 64, CC 16 suc. 4, (1900) B1871DCR La Plata, Argentina

The ammonia + oxygen reaction over Pt(1 0 0) single-crystal surface was studied under UHV conditions using photoemission electron microscopy (PEEM) as spatially resolving method and work function measurements via a Kelvin probe and temperature programmed reaction (TPR) experiments as integral methods. A broad hysteresis in the reaction rates occurs and one finds reaction fronts as well as spatially homogeneous transitions in the adsorbate layer.