Berlin 2008 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
O: Fachverband Oberflächenphysik
O 28: Symposium: Size-Selected Clusters at Surfaces II
(Invited Speakers: Steven Buratto, Stefan Vajda, Matthias Arenz)
O 28.2: Invited Talk (no funding)
Tuesday, February 26, 2008, 11:45–12:15, MA 005
Towards the understanding of size/shape and function relationship in catalysis of complex reactions — •Stefan Vajda1, Sungsik Lee1, Larry A. Curtiss1, Jeffrey P. Greeley1, Paul C. Redfern1, Peter Zapol1, Michael J. Pellin1, Jeffrey W. Elam1, Byeongdu Lee1, Sönke Seifert1, Randall E. Winans1, Yu Lei1,2, Randall J. Meyer2, Arantxa Fraile-Rodríguez3, Luis M. Molina4, Maria J. López4, Julio M. Alonso4, Kristian Sell5, Ingo Barke5, Armin Kleibert5, Viola von Oeynhausen5, and Karl-Heinz Meiwes-Broer5 — 1Argonne National Laboratory, Argonne, USA — 2University of Illinois at Chicago, USA — 3Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland — 4Universidad de Valladolid, Valladolid, Spain — 5Institut für Physik, Universität Rostock, Rostock, Germany
This contribution focuses on partial oxidation reactions catalyzed by sub-nanometer to several ten nanometer large size-selected clusters. Catalytic performance and changes in cluster shape are studied under realistic reaction conditions, allowing to elucidate the size/shape/composition and function relationship in catalysis. Here we show 1) gold and silver clusters which promote with high selectivity the direct oxidation of propylene to propylene oxide, and 2) sub-nanometer platinum clusters catalyzing the oxidative dehydrogenation of propane with high selectivity and activity. Theoretical calculations and modeling provide a detailed insight of the catalytic process. The findings stress the important role of small clusters in promoting reactions with high selectivity and activity.