Reactivity of Oxygen Adatoms on the Au(111) Surface

Lazaga, Mark; Wickham, David; Parker, Deborah Holmes; Kastanas, George N.; Koel, Bruce E.

doi:10.1021/bk-1993-0523.ch008

Cited by 58 publications

(110 citation statements)

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“…They saw a linear decrease in the reaction rate with oxygen coverage. Koel's (144,145) group also observed a decrease in reaction rate with temperature between 250-375 K, which gave an apparent activation energy of -2.5 kcal/mol (102). This value is consistent with several reported in the literature for real catalysts and the authors concluded that this effectively rules out an Eley-Rideal mechanism since a single step reaction cannot have a negative activation energy.…”

Section: 3supporting

confidence: 85%

“…Although no reaction occurs, the water was chemisorbed more strongly on the oxygen modified surface leading to a desorption peak at 215 K as opposed to 190 K on the clean surface. Koel and co-workers later found very similar results for the interaction of methanol, ethylene and water with atomic oxygen on the Au(111) surface as Outka and Madix's results on the Au(110) surface (102). This may indicate that these reactions studied are structure insensitive, upon adsorption of oxygen atoms.…”

Section: 3supporting

confidence: 57%

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Surface chemistry of catalysis by gold

et al. 2004

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IntroductionGold has long been regarded as an "inert" surface and bulk gold surfaces do not chemisorb many molecules easily. However, in the last decade, largely through the efforts of Masatake Haruta, gold particles, particularly those below 5 nm in size, have begun to garner attention for unique catalytic properties (1-8). In recent years, supported gold particles have been shown to be effective as catalysts for low temperature CO oxidation (9), selective oxidation of propene to propene oxide (10), water gas shift (11), NO reduction (12), selective hydrogenation of acetylene (or butadiene) (13)

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Section: 3supporting

confidence: 85%

Section: 3supporting

confidence: 57%

Surface chemistry of catalysis by gold

et al. 2004

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“…Annealing experiments suggest (see below) that the 529.8 eV feature is linked to the formation of titanium oxide, whereas the 531.2 eV component seems to indicate the presence of excess oxygen adsorbed on the gold surface. However, this interpretation is not unambiguous as chemisorbed oxygen on Au(111) surfaces typically exhibits the O(1s) binding energies in the range of 529.8-530.1 eV [27].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of TiO2 nanoparticles on the Au(111) surface

Biener

Farfan-Arribas

Biener

et al. 2005

The Journal of Chemical Physics

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The growth of titanium oxide nanoparticles on reconstructed Au(111) surfaces was investigated by scanning tunneling microscopy and X-ray photoelectron spectroscopy. Ti was deposited by physical vapor deposition at 300 K. Regular arrays of titanium nanoparticles form by preferential nucleation of Ti at the elbow sites of the herringbone reconstruction. Titanium oxide clusters were synthesized by subsequent exposure to O 2 at 300 K. Two-and three-dimensional titanium oxide nanocrystallites form during annealing in the temperature range from 600 to 900 K. At the same time, the Au(111) surface assumes a serrated, <110> oriented step-edge morphology, suggesting step-edge pinning by titanium oxide nanoparticles. The oxidation state of these titanium oxide nanoparticles varies with annealing temperature. Specifically, annealing to 900 K results in the formation of stoichiometric TiO 2 nanocrystals as judged by the observed XPS binding energies. Nano-dispersed TiO 2 on Au(111) is an ideal system to test the various models explaining the enhanced catalytic reactivity of supported Au nanoparticles. IntroductionMetal oxides are of considerable interest because of their technological importance, e.g. in the field of heterogeneous catalysis, where they are used as catalyst supports for a wide variety of metals. The interaction of the adsorbed metal particles with the oxide support is complex and gives rise to interesting phenomena such as the strong metal support interaction (SMSI). This term describes the change in catalytic activity (favoring hydrogenation) observed when group VIII B metals supported on reducible oxides (TiO 2 , TaO 5 , CeO 2 , NbO) are annealed in a reducing atmosphere [1]. Transition metal oxides are also used to support other oxides in the socalled monolayer catalysts. For example, V 2 O 5 /TiO 2 systems are used for the partial oxidation of methanol, and have been extensively studied in single crystal as well as in powder form [2][3][4][5].

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“…The catalytic activity of small gold particles is interesting, since low-index gold surfaces are known to be noble [9][10][11] and inactive towards most molecules. The fundamental question is therefore which size-related properties make the gold nanoparticles catalytically active.…”

Section: Introductionmentioning

confidence: 99%

Insights into the reactivity of supported Au nanoparticles: combining theory and experiments

et al. 2007

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The origin of the extraordinary catalytic activity of gold nanoparticles is discussed on the basis of density-functional calculations, adsorption studies on single crystal surfaces, and activity measurements on well characterized supported gold particles. A number of factors are identified contributing to the activity, and it is suggested that it is useful to consider lowcoordinated Au atoms as the active sites, for example, CO oxidation and that the effect of the support can be viewed as structural and electronic promotion. We identify the adsorption energy of oxygen and the Au-support interface energy as important parameters determining the catalytic activity.

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Reactivity of Oxygen Adatoms on the Au(111) Surface

Cited by 58 publications

References 0 publications

Surface chemistry of catalysis by gold

Surface chemistry of catalysis by gold

Synthesis of TiO2 nanoparticles on the Au(111) surface

Insights into the reactivity of supported Au nanoparticles: combining theory and experiments

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