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Modeling heterogeneous catalysts: metal clusters on planar oxide supports
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TLDR
In this paper, the properties of nanosized supported metal clusters were investigated using low-energy ion scattering spectroscopy (LEIS), temperature-programmed desorption (TPD), X-ray photoelectron spectrograph (XPS) and scanning tunneling microscopy (STM) and spectroscopic (STS) with emphasis on the unique properties of clusters <5.0 nm in size.Abstract:
Model catalysts consisting of Au and Ag clusters of varying size have been prepared on single crystal TiO2(110) and ultra-thin films of TiO2, SiO2 and Al2O3. The morphology, electronic structure, and catalytic properties of these Au and Ag clusters have been investigated using low-energy ion scattering spectroscopy (LEIS), temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM) and spectroscopy (STS) with emphasis on the unique properties of clusters <5.0 nm in size. Motivating this work is the recent literature report that gold supported on TiO2 is active for various reactions including low-temperature CO oxidation and the selective oxidation of propylene. These studies illustrate the novel and unique physical and chemical properties of nanosized supported metal clusters.read more
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Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters
TL;DR: It is demonstrated that platinum (Pt) oxygen-reduction fuel-cell electrocatalysts can be stabilized against dissolution under potential cycling regimes by modifying Pt nanoparticles with gold (Au) clusters, and data suggest that the Au clusters confer stability by raising the Pt oxidation potential.
Journal ArticleDOI
The Structure of Catalytically Active Gold on Titania
Mingshu Chen,D. W. Goodman +1 more
TL;DR: Kinetic measurements for the catalytic oxidation of carbon monoxide show that the gold bilayer structure is significantly more active than the monolayer, thus eliminating particle shape and direct support effects.
Journal ArticleDOI
Catalysis with transition metal nanoparticles in colloidal solution: nanoparticle shape dependence and stability.
TL;DR: These studies provide important clues on the mechanism of the reactions the authors studied and also can be very useful in the process of designing better catalysts in the future.
Journal ArticleDOI
Shape-Dependent Catalytic Activity of Platinum Nanoparticles in Colloidal Solution
TL;DR: In this paper, the activation energies and the average rate constants were determined in the 298 K−318 K temperature range for the early stages of the nanocatalytic reaction between hexacyanoferrate (III) and thiosulfate ions using 4.8 ± 0.1 nm tetrahedral, 7.1 µm cubic, and 4.9 µm near spherical nanocrystals.
References
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Journal ArticleDOI
Onset of Catalytic Activity of Gold Clusters on Titania with the Appearance of Nonmetallic Properties
Mika Valden,X. Lai,D. W. Goodman +2 more
TL;DR: Results suggest that supported clusters, in general, may have unusual catalytic properties as one dimension of the cluster becomes smaller than three atomic spacings.
Journal ArticleDOI
Size- and support-dependency in the catalysis of gold
TL;DR: In this article, the adsorption properties and reactivities of gold are summarized in terms of their size dependency from bulk to fine particles, clusters and atoms, and the catalytic performances of gold markedly depend on dispersion, supports, and preparation methods.
Book
Introduction to surface chemistry and catalysis
Gabor A. Somorjai,Brian E. Bent +1 more
TL;DR: The Structure of Surfaces: An Introduction as mentioned in this paper The structure of surfaces and its properties are discussed in detail in Section 5.1.2.3 The Dynamics at Surfaces. 4 Electrical properties of surfaces. 5 Surface Chemical Bond.
Journal ArticleDOI
Low-Temperature Oxidation of CO over Gold Supported on TiO2, α-Fe2O3, and Co3O4
TL;DR: In this paper, the authors proposed a mechanism in which CO adsorbed on gold particles migrates toward the perimeter on support oxides and there it reacts with oxygen to form bidentate carbonate species.
Book
Principles of Adsorption and Reaction on Solid Surfaces
TL;DR: The Structure of Solid Surfaces and Adsorbate Overlayers as discussed by the authors, the Binding of Molecules to Surfaces, and the Kinetics of Adsorption are discussed.
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Onset of Catalytic Activity of Gold Clusters on Titania with the Appearance of Nonmetallic Properties
Mika Valden,X. Lai,D. W. Goodman +2 more