Oxygen-induced restructuring of Ag(111)

Bao, Xinhe; Barth, Johannes V.; Lehmpfuhl, G.; Schuster, R.; Uchida, Yuji; Schlögl, Robert; Ertl, G.

doi:10.1016/0039-6028(93)90522-l

Cited by 121 publications

(89 citation statements)

References 13 publications

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“…Usually, single crystals were used in these studies to serve as model surfaces. Figure 1 5 surface atoms (14)(15)(16). Figure 1c shows atoms had a reaction probability of unitythat is, every hydrogen molecule was dissociated when scattered from the stepped platinum surface (19; 26).…”

Section: Phenomena Revealed By Surface Science Studies In Vacuummentioning

confidence: 99%

Concepts, instruments, and model systems that enabled the rapid evolution of surface science

Somorjai

Park

2009

Surface Science

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Over the past forty years, surface science has evolved to become both an atomic scale and a molecular scale science. Gerhard Ertl's group has made major contributions in the field of molecular scale surface science, focusing on vacuum studies of adsorption chemistry on single crystal surfaces. In this review, we outline three important aspects that led to the recent advances of surface chemistry: the development of concepts, in situ instruments for molecular scale surface studies at buried interfaces (solid-gas and solidliquid), and new model nanoparticle surface systems in addition to single crystals.Combined molecular beam surface scattering and low energy electron diffraction (LEED)-surface structure studies on metal single crystal surfaces revealed new concepts, including adsorbate-induced surface restructuring and the unique activity of defects, atomic steps and kinks on metal surfaces. We have combined high pressure catalytic reaction studies with ultrahigh vacuum (UHV) surface characterization techniques using the UHV chamber equipped with a high-pressure reaction cell. New instruments, such as high pressure sum frequency generation (SFG) vibrational spectroscopy and scanning tunneling microscopy (STM) have been built that permit molecular-level surface studies performed at pressures. Tools that can access broad ranges of pressures can be used for both the in situ characterization of buried interfaces of solid-gas and solid-liquid and the study of catalytic reaction intermediates. The model systems for the study of molecular 2 surface chemistry have evolved from single crystals to nanoparticles in the 1-10 nm size range, which are the preferred media in catalytic reaction studies.

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Section: Phenomena Revealed By Surface Science Studies In Vacuummentioning

confidence: 99%

Concepts, instruments, and model systems that enabled the rapid evolution of surface science

Somorjai

Park

2009

Surface Science

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“…The reaction occurred above 400 • C, and the conversion was below 10% in the whole temperature range. The low activity of NO direct decomposition is probably due to a strong affinity of oxygen towards silver surfaces [26,27].…”

Section: Effect Of Feed Gas Compositionsmentioning

confidence: 99%

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

Shi

Cheng

et al. 2002

Applied Catalysis B: Environmental

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“…[31][32] Direct propylene epoxidation by molecular oxygen over silver-based catalysts has also been investigated [6,[38][39][40][41][42][43][44][45][46][47][48][49][50] but, since conventionally synthesized catalysts are highly polycrystalline -exhibiting several crystallographic facets and showing broad particle size distribution-, a detailed understanding of the nature of the selective active sites becomes a quite challenging task. It is therefore of interest to gain an atomistic view of the catalytic centers and of the reaction mechanism by means of theoretical calculations.…”

Section: Introductionmentioning

confidence: 99%

“…Low oxygen coverage has been selected in the experimental study to avoid severe catalyst reconstruction. [39,50] Based on these results, the better catalytic performance of Ag(100) facet towards propylene oxide production is discussed.…”

Section: Introductionmentioning

confidence: 99%

Aerobic epoxidation of propene over silver (111) and (100) facet catalysts

Pulido

Concepción

Boronat

et al. 2012

Journal of Catalysis

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Academic Press; ElsevierPulido Junquera, MA.; Concepción Heydorn, P.; Boronat Zaragoza, M.; Corma Canós, A. (2012). Aerobic epoxidation of propene over silver (111) and (100) AbstractCatalytic performance of single crystal Ag(100) and Ag(111) catalysts for propene oxidation has been investigated by means of Raman spectroscopy and mass spectrometry, and the energy profile has been obtained at the DFT-D level. It has been theoretically found, and confirmed by Raman spectroscopy, that Ag(100) surface is more reactive towards O 2 dissociation than Ag(111), and that adsorbed oxo-species are more strongly bonded to the Ag(100) facet. The higher selectivity towards propylene oxide (PO) observed for the Ag(100) catalyst can be rationalized from theoretical calculations indicating that the activation barriers for formation of the allylic intermediate -precursor of combustion products-are rather similar on both silver surfaces, whereas energy barriers on the reaction pathways for formation of PO and carbonylic products (acetone and propanal) are systematically smaller on the Ag (100) surface.

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Oxygen-induced restructuring of Ag(111)

Cited by 121 publications

References 13 publications

Concepts, instruments, and model systems that enabled the rapid evolution of surface science

Concepts, instruments, and model systems that enabled the rapid evolution of surface science

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

Aerobic epoxidation of propene over silver (111) and (100) facet catalysts

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