Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 75: Fundamentals of Catalysis I

O 75.3: Hauptvortrag

Donnerstag, 4. April 2019, 11:00–11:30, H5

Structure evolution of oxide-supported metal nanoparticles under different conditions — •Yuemin Wang — Institute of Functional Interfaces, Karlsruhe Institute of Technology, Germany

A fundamental understanding of nanostructured metal oxides and oxide-supported metal nanoparticles (NPs) is among the most important and challenging topics in catalysis and nanoscience. Here, we present our recent work on various metal/oxide NPs (Cu/CeO₂, Pt/CeO₂ and Pt/Al₂O₃). The study combining in-situ IR spectroscopy (polarization-resolved IRRAS on model systems and IR transmission on powders), high-resolution TEM and DFT calculations allowed us to gain deep insight into structural, electronic and reactive properties of the metal/oxide systems under different conditions. The results revealed that the atomic structure of pristine and metal-decorated oxide surfaces can vary substantially depending on activation or reaction conditions. For Cu/CeO₂, we will discuss the atomic structure of ultrafine copper clusters (bilayer, 1.0-1.5 nm) and the dynamic behavior under reactive gases at elevated temperatures. For Pt/CeO₂ and Pt/Al₂O₃ systems, we will focus on the structure evolution of various Pt clusters during the course of activation or reaction.