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Yang, Mingxu; Jacobs, Peter W.; Yoon, Choon Sik; Muray, L. P.; Anderson, Eve Alma; Attwood, David; Somorjai, Gábor A.

doi:10.1023/a:1019090823171

Cited by 33 publications

(25 citation statements)

References 6 publications

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“…This effects was used by Friedorow and Wanke [26], Ruckenstein and Malhotra [27] and Flynn and Wanke [28] to redisperse Al 2 O 3 supported Pt particles which had sintered after hightemperature treatment in hydrogen. These results are also in agreement with recent findings of Yang et al who found that oxygen treatment at about 670 K leads to a disrupture of supported Ag particles to smaller subunits [29]. It thus can be concluded that temperature treatment in oxygen leads to particle size reduction and simultaneous surface faceting.…”

Section: K Tsupporting

confidence: 93%

High temperature partial oxidation reactions over silver catalysts

Nagy

Mestl

1999

Applied Catalysis A: General

177

115

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In honor of Prof. Dr. Wolfgang Sachtler´s 75 th birthday. AbstractThe exceptional catalytic activity of silver for a number of partial oxidation reactions has been known for nearly a century. Despite the wid espread use of silver in heterogeneous catalysis, there still remain unresolved questions about the mechanistic details of reaction. The ethylene epoxidation and formaldehyde synthesis reactions are the two industrially-relevant reactions which have received, by far, the most attention. The importance of these reactions cannot be underestimated. Both ethylene epoxide and formaldehyde serve as primary chemicals for a wide variety of materials which find use in an enormous number of products. There is, therefore, a great scientific and economi c motivation for understanding these reactions and for unraveling the secret to the exceptional catalytic a ctivity of silver. This contribution in honor of Prof. W. Sachtler´s 75 th birthday summarizes recent results obtained in our laboratory on the formaldehyde synthesis reaction and the oxidative coupling of methane as a laboratory test reaction. The article shows that the formation of bulk-dissolved oxygen species is critical to activation of the silver for reaction. Both the chemical composition and the bulk morphology of the catalyst are strong functions of the gas-phase composition and reaction temperature. Similar apparant activation energies determined for oxygen diffusion and oxidative coupling of methane suggest that the rate limiting step of the oxidative coupling of methane over silver is the diffusion of bulk-dissolved oxygen to silver (111) surfaces at which oxygen rapidly reacts with methane.

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Section: K Tsupporting

confidence: 93%

High temperature partial oxidation reactions over silver catalysts

Nagy

Mestl

1999

Applied Catalysis A: General

177

115

View full text Add to dashboard Cite

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“…However, the detected amount of O at the interface is much higher than for stoichiometric SiO 2 . This suggests that Ag islands could be partially oxidized upon thermal treatment, as previously observed [24]. Silver oxidization represents a decrease of the filling factor of the material with metallic behavior and thus explains the intensity reduction and blue-shift of the SPR absorption observed in zones B with respect to the original sample (Fig.…”

Section: Resultssupporting

confidence: 76%

Three-dimensional photonic microstructures produced by electric field assisted dissolution of metal nanoclusters in multilayer stacks

et al. 2009

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The formation of three dimensional (3D) photonic microstructures by the locally selective dissolution of metal clusters embedded in dielectric multilayer stacks is presented. Dissolution of clusters is performed by the simultaneous application of electric field and temperature. The produced photonic structures show a highly tailorable optical behavior that combines the interferential effects of multilayer stacks and the surface plasmon resonance of non-dissolved metal clusters. Due to its feasibility and the possibility to widely modify the optical properties of the resulting structures, the current approach represents a promising method for the production of novel components based on 3D-metallodielectric photonic structures.

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“…2B) that silver particles do not sinter after H 2 pretreatment. It has been known that the thermal stability of the silver particles is significantly lower under oxidizing conditions, and heating at higher temperatures under oxidizing conditions will induce the migration of the silver particles [27,28]. A high catalytic activity has also been found on a physical mixture of Ag with silica powder after oxygen activation at higher temperatures [26].…”

Section: Activity Testmentioning

confidence: 99%