Karl Franzens University Graz
Graz University of Technology
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Karl Franzens University Graz | Graz University of Technology | |
Reactions on Heterogeneous Catalysts: Ambient Pressure Surface Science on Planar Model Systems Advances in the preparation of planar nanostructured surfaces (single crystals, thin films, supported nanoparticles) under ultrahigh vacuum enable us to model an increasing number of technical catalysts. Significant advances have also been made in carrying out Surface Science at ambient pressure. Polarization-modulated infrared reflection absorption spectroscopy (PM-IRAS) and sum frequency generation (SFG) vibrational laser spectroscopy, complemented by high-pressure X-ray photoelectron spectroscopy (HP-XPS), have been utilized for studies of surface reactions at near atmospheric pressure. This allows us to investigate a functioning surface in its active state. Increasing attention is directed towards comparing global reaction properties with local activity (as revealed by photoemission electron microscopy PEEM), as well as towards contrasting model systems and industrial-grade catalysts. A number of case studies are presented illustrating the dynamic behavior of catalytically active surfaces, including surface alloys and surface oxides for methanol and CO surface reactions. |