Planar Au/TiO2 Model Catalysts: Fabrication, Characterization and Catalytic Activity

✍ Scribed by Menhild Eyrich; Stefan Kielbassa; Thomas Diemant; Johannes Biskupek; Ute Kaiser; Ulf Wiedwald; Paul Ziemann; Joachim Bansmann

• Book ID: 102810024
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 598 KB
• Volume: 11
• Category: Article
• ISSN: 1439-4235
• DOI: 10.1002/cphc.200900942

✦ Synopsis

Abstract

Different types of planar Au/TiO~2~ model catalysts are produced on TiO~2~(110) single‐crystal substrates and thin TiO~2~ films on Ru(0001) by physical vapor deposition of gold under ultrahigh‐vacuum (UHV) conditions or by micelle‐based chemical routes. Both the Au nanoparticles and the support are characterized by surface‐science‐based methods (such as atomic force microscopy and X‐ray photoelectron spectroscopy) as well as by transmission electron microscopy. Finally, the activity of the model catalysts in the CO oxidation reaction is analyzed in a microflow reactor. Au/TiO~2~(110) model catalysts with a stoichiometric TiO~2~(110) support exhibit only a low catalytic activity compared to those with a reduced crystal and Au/TiO~2~ model catalysts with thin TiO~2~ films on Ru(0001) as a substrate. The possible influence of Ti interstitials in the reduced TiO~2~(110) substrates on the CO oxidation activity is discussed.