Catalysis by Noble Metal Nanoparticles Supported on Thin-Oxide Films



Noble metal single crystals have served as successful model systems for heterogeneous catalysts. However, it was soon realized that even stepped single crystals may not fully represent the catalytic properties of oxide-supported metal nanoparticles. A number of planar nanoparticle model catalysts have thus been developed and thoroughly characterized with respect to particle nucleation and growth, particle surface structure and composition, adsorption properties, and catalytic activity. A critical issue was to prepare well-defined crystalline thin-oxide films that could be used as model supports. The methods involved include STM, AFM, TEM, LEED, AES, XPS, TPD, IRAS, molecular beams, and microreactor kinetics. Following extensive studies under ultrahigh vacuum, a growing interest was recently directed toward exposing nanoparticle model catalysts to ambient pressure, utilizing UHV-high-pressure cells. A logical further step was to employ in situ techniques, e.g., SFG and PM-IRAS vibrational spectroscopy, to elucidate structure-function relationships under realistic conditions. Comparison with single-crystal results revealed the specific properties of supported nanoparticles.


Methanol Oxidation Model Catalyst Hollow Site Model Catalysis Threefold Hollow Site 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The author is very grateful to those who contributed to the case studies discussed, in particular to A. Bandara, M. Borasio, T. Dellwig, P. Galletto, H. Hofmeister, F. Höbel, L. Hu, B. Kell, M. Morkel, O. Rodriguez de la Fuente, J. Silvestre-Albero, H. Unterhalt, and, specifically H.-J. Freund. Collaborations with V.I. Bukhtiyarov, B. Klötzer, R. Schlögl, J.J. Calvino, J.-A. Perez-Omil, and G.A. Somorjai are gratefully acknowledged. The STM images in Figure 15.7 are courtesy of M. Heemeier, M. Bäumer, H.-J. Freund, E. Napetschnig, M. Schmid, and P. Varga.


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Authors and Affiliations

  1. 1.Institute of Materials Chemistry, Vienna University of TechnologyViennaAustria

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