Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 61: Heterogeneous Catalysis

O 61.4: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG2

Hydrogenation reactions on Pd nanoparticles studied under UHV conditions — •Marian Rötzer, Maximilian Krause, Florian Schweinberger, and Ueli Heiz — Technische Universität München, Lehrstuhl für Physikalische Chemie, München

Hydrogenation reactions of unsaturated hydrocarbons are of major importance for chemical industry. Therefore we investigated the hydrogenation of ethylene and acetylene on supported palladium nanoparticles consisting of 20-40 atoms under ultra-high vacuum conditions (UHV). In order to evaluate the influence of support material on the nanoparticles, two different amorphous silica films are synthesized either on a Mo(211) or a Pt(111) single crystal. The presence of different types of hydrogen species on the particles and how they can be effectively tuned by the support material are tested by temperature-programmed desorption (TPD). A pulsed molecular beam technique is used to study the hydrogenation of ethylene and acetylene under isothermal conditions. A special focus is put on the available reaction pathways for these two reactions on both support systems. Important differences are discussed and how they can be tuned by proper choice of support material based on a mechanistic level.