Tuning Reactivity and Selectivity for Olefin Oxidation through Local O bonding on Au

Title
Tuning Reactivity and Selectivity for Olefin Oxidation through Local O bonding on Au
Authors
민병권Xingyi DengXiaoying LiuCynthia M. FriendAli Reza Alemozafar
Keywords
gold; olefin oxidation; gold oxide
Issue Date
2009-08
Publisher
ChemCatChem
Citation
VOL 1, 116-121
Abstract
The reactivity and selectivity for the oxidation of propene and acrolein on oxidized Au nanoparticles on AuACHTUNGTRENUNG(111) depend on the local bonding, the particle size, and the degree of order. The local bonding of O and the particle size distribution and order are controlled by the rate and temperature for oxygen deposition using ozone, which forms O-containing gold particles on the surface. On small, disordered particles, oxygen is bound in sites with local threefold coordination, based on measured vibrational energies. The O on these small disordered nanoclusters, formed by O3 decomposition on AuACHTUNGTRENUNG(111) at 200 K, is highly reactive and yields partial oxidation products of propene, for example, acrolein and acrylic acid. In contrast, atomic oxygen present in ordered 2D islands formed at 400 K is relatively unreactive and only produces CO2 and H2O. All pathways involve initial C H activation. These results indicate that local bonding of O is an important factor to consider in understanding the effect of particle size in gold-based catalysis involving hydrocarbons.
URI
http://pubs.kist.re.kr/handle/201004/35701
ISSN
18673880
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KIST Publication > Article
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