Activation of Au nanoparticles on oxide surfaces: reaction of SO2 with Au/MgO(100)

Rodríguez, José A.; Pérez, Manuel; Jirsàk, Tomàš; Evans, Jonathan P.; Hrbek, Jan; González, Lucı́a

doi:10.1016/s0009-2614(03)01341-1

Cited by 60 publications

(72 citation statements)

References 31 publications

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“…A consequence of the perturbation may be unique adsorption behavior that neither gold nor the support material exhibit alone. An example of this type of synergism is the dissociation of H2S on Au/Cr2O3 catalysts as studied by Rodriguez and co-workers with synchrotron radiation measurements (362). Ab initio calculations supported a mechanism whereby a charge transfer occurred from the gold particles to the oxide support and H2S decomposed easily on the electron deficient gold.…”

Section: 3mentioning

confidence: 96%

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: 3mentioning

confidence: 96%

Surface chemistry of catalysis by gold

et al. 2004

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“…Various models have been proposed to explain the unusual catalytic properties of gold nanoclusters ranging from metal-support interactions to finite size effects [11]. More recently, undercoordinated Au atoms have been linked to the enhanced reactivity of supported Au nanoparticles [12][13][14].Yet another explanation involves oxygen spillover from the oxide to the Au nanoparticles thus providing a source of oxygen.…”

Section: Introductionmentioning

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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“…For example, gold nanoparticles on TiO 2 (110) are very efficient catalysts for the low-temperature oxidation of CO [1], as well as for the decomposition of SO 2 [2]. Various models have been proposed to explain the unusual catalytic properties of gold nanoclusters ranging from metal-support interactions to finite size effects [1].…”

Section: Introductionmentioning

confidence: 99%

“…Various models have been proposed to explain the unusual catalytic properties of gold nanoclusters ranging from metal-support interactions to finite size effects [1]. A new aspect of gold nanoclusters was recently introduced by Rodriguez et al [2], who performed a theoretical study on the reactivity of under-coordinated Au atoms. The study reveals that under-coordinated Au atoms in Au nanoparticles can play an important role.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced transient reactivity of an O-sputtered Au(111) surface

Biener

Friend

2005

Surface Science

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The interaction of SO 2 with oxygen-sputtered Au(111) surfaces (θ oxygen ≤ 0.35 ML) was studied by monitoring the oxygen and sulfur coverages as a function of SO 2 exposure. Two reaction regimes were observed: oxygen depletion followed by sulfur deposition. An enhanced, transient sulfur deposition rate is observed at the oxygen depletion point. This effect is specifically pronounced if the Au surface is continuously exposed to SO 2 . The enhanced reactivity towards S deposition seems to be linked to the presence of highly reactive, under-coordinated Au atoms. Adsorbed oxygen appears to stabilize, but also to block these sites. In absence of the stabilization effect of adsorbed oxygen, i.e. at the oxygen depletion point, the enhanced reactivity decays on a timescale of a few minutes. These observations shed a new light on the catalytic reactivity of highly dispersed gold nanoparticles.2

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Activation of Au nanoparticles on oxide surfaces: reaction of SO2 with Au/MgO(100)

Cited by 60 publications

References 31 publications

Surface chemistry of catalysis by gold

Surface chemistry of catalysis by gold

Synthesis of TiO2 nanoparticles on the Au(111) surface

Enhanced transient reactivity of an O-sputtered Au(111) surface

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