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Planar Au/TiO 2 Model Catalysts: Fabrication, Characterization and Catalytic Activity
Author(s) -
Eyrich Menhild,
Kielbassa Stefan,
Diemant Thomas,
Biskupek Johannes,
Kaiser Ute,
Wiedwald Ulf,
Ziemann Paul,
Bansmann Joachim
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900942
Subject(s) - catalysis , fabrication , characterization (materials science) , planar , nanotechnology , materials science , chemical engineering , chemistry , computer science , organic chemistry , engineering , medicine , alternative medicine , computer graphics (images) , pathology
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.