Reactivity of TiO2 Rutile and Anatase Surfaces toward Nitroaromatics
- 9 December 2009
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 132 (1), 64-66
- https://doi.org/10.1021/ja907865t
Abstract
The Au−TiO2 system is a promising catalyst for the synthesis of nitro-aromatic compounds. The adsorption of azobenzene (C6H5N═NH5C6) and aniline (C6H5NH2) on two single-crystalline TiO2 surfaces, anatase (101) and rutile (110), has been investigated with scanning tunneling microscopy (STM), low energy electron diffraction (LEED), and X-ray photoemission spectroscopy (XPS). While azobenzene adsorbs as an intact molecule at low coverages, ordered overlayers of phenyl imide (C6H5N) form at saturation coverage, indicating that TiO2 surfaces cleave the N═N bond even without the presence of Au. The same superstructures, p(1 × 2) on anatase and c(2 × 2) on rutile, form upon adsorption of aniline, suggesting the formation of the same, or a very similar, reaction intermediate. These results suggest that the main role of the supported Au in catalytic aniline ↔ azobenzene conversion is the activation of O2/H2 for de/hydrogenation reactions.Keywords
This publication has 21 references indexed in Scilit:
- Design of highly active and chemoselective bimetallic gold–platinum hydrogenation catalysts through kinetic and isotopic studiesJournal of Catalysis, 2009
- Evidence for the Predominance of Subsurface Defects on Reduced AnatasePhysical Review Letters, 2009
- Decomposition of catechol and carbonaceous residues on TiO2(110): A model system for cleaning of extreme ultraviolet lithography opticsJournal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2008
- Reversible Photomechanical Switching of Individual Engineered Molecules at a Metallic SurfacePhysical Review Letters, 2007
- Conformational Molecular Switch of the Azobenzene Molecule: A Scanning Tunneling Microscopy StudyPhysical Review Letters, 2006
- Azobenzene on Cu(110): Adsorption Site-Dependent DiffusionJournal of the American Chemical Society, 2006
- Reversible cis–trans Isomerization of a Single Azobenzene MoleculeAngewandte Chemie-International Edition, 2006
- Ab initioand experimental studies of chlorine adsorption on the rutile(110) surfacePhysical Review B, 2002
- Onset of Catalytic Activity of Gold Clusters on Titania with the Appearance of Nonmetallic PropertiesScience, 1998
- Size- and support-dependency in the catalysis of goldCatalysis Today, 1997