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Catalysis by Thin Oxide Films and Oxide Nanoparticles

  • Günther Rupprechter
  • Simon Penner
Chapter

Abstract

Model systems for transition and noble metal oxide catalysts, either as thin films or nanoparticles, were prepared by vacuum-deposition of oxides or oxidation of metals (particles, thin films, single crystals). These systems, including Ga2O3, In2O3, V2O3, V2O5, Nb2O5, Pd5O4 and PdO, are well suited for atomic scale characterization by surface-specific methods and for catalytic tests. Investigations of structure and composition were carried out by HRTEM, AFM, STM, SAED, LEED, EDX, XPS and DFT. In many cases, the surface structure of oxides does not coincide with truncations of the known bulk structures. The adsorption properties of the oxide models, in particular those of defects such as oxygen vacancies or step edges, were examined by vibrational spectroscopy (FTIR and SFG) and thermal desorption spectroscopy (TPD) of probe molecules (CO, H2, propane and propene). Together with XPS, quantification of surface coverage was performed. The catalytic activity and selectivity of the model oxides at (near) ambient gas pressure were investigated by microreactor studies of methanol steam reforming (MSR), (inverse) water gas shift (WGS) and CO oxidation. The structural/compositional flexibility of oxides leads to significant challenges in their characterization but also imparts them with exceptional catalytic properties.

Keywords

Scanning Tunneling Microscopy Thin Oxide Film Scanning Tunneling Microscopy Image Vanadium Oxide Methanol Steam 
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.

Notes

Acknowledgments

The authors are grateful to those who contributed to the case studies discussed, in particular to A. Bandara, J. Bernardi, E. Bertel, M. Borasio, K. Föttinger, H.-J. Freund, K. Hayek, F. Höbel, W. Jochum, B. Kell, F. Klauser, B. Klötzer, R. Kramer, X. Liu, H. Lorenz, R. Schlögl, M. Stöger-Pollach and Ch. Weilach.

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© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Institute of Materials Chemistry, Vienna University of TechnologyViennaAustria
  2. 2.Institute of Physical Chemistry, University of InnsbruckInnsbruckAustria

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