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- W2067432914 endingPage "5250" @default.
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- W2067432914 abstract "Synchrotron-based high-resolution photoemission and first-principles density-functional slab calculations were used to study the interaction of gold with titania and the chemistry of SO(2) on Au/TiO(2)(110) surfaces. The deposition of Au nanoparticles on TiO(2)(110) produces a system with an extraordinary ability to adsorb and dissociate SO(2). In this respect, Au/TiO(2) is much more chemically active than metallic gold or stoichiometric titania. On Au(111) and rough polycrystalline surfaces of gold, SO(2) bonds weakly and desorbs intact at temperatures below 200 K. For the adsorption of SO(2) on TiO(2)(110) at 300 K, SO(4) is the only product (SO(2) + O(oxide) --> SO(4,ads)). In contrast, Au/TiO(2)(110) surfaces (theta;(Au) < or = 0.5 ML) fully dissociate the SO(2) molecule under identical reaction conditions. Interactions with titania electronically perturb gold, making it more chemically active. Furthermore, our experimental and theoretical results show quite clearly that not only gold is perturbed when gold and titania interact. The adsorbed gold, on its part, enhances the reactivity of titania by facilitating the migration of O vacancies from the bulk to the surface of the oxide. In general, the complex coupling of these phenomena must be taken into consideration when trying to explain the unusual chemical and catalytic activity of Au/TiO(2). In many situations, the oxide support can be much more than a simple spectator." @default.
- W2067432914 created "2016-06-24" @default.
- W2067432914 creator A5012101594 @default.
- W2067432914 creator A5013018780 @default.
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- W2067432914 creator A5038550012 @default.
- W2067432914 creator A5058637832 @default.
- W2067432914 creator A5086456117 @default.
- W2067432914 date "2002-04-17" @default.
- W2067432914 modified "2023-10-18" @default.
- W2067432914 title "Activation of Gold on Titania: Adsorption and Reaction of SO<sub>2</sub> on Au/TiO<sub>2</sub>(110)" @default.
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