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Structure–Activity Correlations for Au Nanoclusters Supported on TiO 2
Author(s) -
Valden Mika,
Goodman D. Wayne
Publication year - 1998
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199800034
Subject(s) - nanoclusters , chemistry , scanning tunneling microscope , catalysis , oxide , spectroscopy , dispersion (optics) , metal , reactivity (psychology) , chemical physics , nanotechnology , organic chemistry , medicine , materials science , physics , alternative medicine , pathology , quantum mechanics , optics
The catalytic performance of reducible metal‐oxide‐supported Au nanoclusters displays striking dependencies on several factors such as dispersion, support, pretreatment, and preparation methods. Planar model Au/TiO 2 catalysts have been prepared in ultrahigh vacuum in order to investigate the strong size dependence of low‐temperature CO oxidation. It is demonstrated that the experimentally observed structure sensitivity of CO oxidation on Au/TiO 2 may be rationalized by a quantum size effect. Via scanning tunneling microscopy and spectroscopy (STM/STS) and elevated pressure reaction kinetics measurements, we show that a clear correlation exists between the structural, electronic, and reactivity properties of supported Au nanoclusters.