Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 8: Topical Session Nanoporous Functional Materials III

MM 8.3: Topical Talk

Montag, 23. März 2009, 15:45–16:15, IFW A

Nanoporous gold: surface chemistry and catalysis — •Marcus Bäumer — Institut für Angewandte und Physikalische Chemie, Universität Bremen, Germany

Nanoporous gold (npAu) is a material with remarkable surface chemical properties. Recently, we found out that it catalyzes low temperature CO oxidation without meeting the requirements usually considered to be important for gold catalysts (small particle sizes, oxide supports). Moreover, we could show that is a promising catalyst for the selective oxidation of alcohols. For the latter reaction the results are in full agreement to UHV studies on gold single crystal surfaces [1] proving that such model systems allow elucidating details of the surface chemistry of npAu at the atomic level. Another interesting feature of the material is the high surface-to-volume ratio resulting in macroscopic length changes as a response of reactions taking place on the surface of the porous structure. Apart from these applications, also the role of residual silver in the material and the question whether a bimetallic surface composition is important for the observed phenomena will be addressed. (The following collaborations are acknowledged: J. Biener/A. Hamza, Lawrence Livermore Nat. Lab.; C. Friend/R.J. Madix, Harvard University; J. Weissmüller, INT FZ Karlsruhe; M. Gottfried, H.-P. Steinrück, Univ. Erlangen) [1] R.J. Madix et al., J. Catal. 258 (2008) 410.