Journal ArticleDOI
Catalytically highly active top gold atom on palladium nanocluster
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The 'crown-jewel' concept for preparation of catalytically highly Au-based colloidal catalysts is presented and results indicate that the genesis of the high activity of the catalysts could be ascribed to the presence of negatively charged top Au atoms.Abstract:
Catalysis using gold is emerging as an important field of research in connection with 'green' chemistry. Several hypotheses have been presented to explain the markedly high activities of Au catalysts. So far, the origin of the catalytic activities of supported Au catalysts can be assigned to the perimeter interfaces between Au nanoclusters and the support. However, the genesis of the catalytic activities of colloidal Au-based bimetallic nanoclusters is unclear. Moreover, it is still a challenge to synthesize Au-based colloidal catalysts with high activity. Here we now present the 'crown-jewel' concept (Supplementary Fig. S1) for preparation of catalytically highly Au-based colloidal catalysts. Au-Pd colloidal catalysts containing an abundance of top (vertex or corner) Au atoms were synthesized according to the strategy on a large scale. Our results indicate that the genesis of the high activity of the catalysts could be ascribed to the presence of negatively charged top Au atoms.read more
Citations
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References
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Journal ArticleDOI
Shape-Controlled Synthesis of Gold and Silver Nanoparticles
Yugang Sun,Younan Xia +1 more
TL;DR: Monodisperse samples of silver nanocubes were synthesized in large quantities by reducing silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone) (PVP), characterized by a slightly truncated shape bounded by {100, {110}, and {111} facets.
Book
Electron Energy-Loss Spectroscopy in the Electron Microscope
Ray F. Egerton,Dale E. Newbury +1 more
TL;DR: In this article, the authors present an overview of the basic principles of energy-loss spectroscopy, including the use of the Wien filter, and the analysis of the inner-shell of the detector.
Journal ArticleDOI
Solvent-Free Oxidation of Primary Alcohols to Aldehydes Using Au-Pd/TiO2 Catalysts
Dan I. Enache,Jennifer K. Edwards,Philip Landon,Benjamin Solsona-Espriu,Albert Frederick Carley,Andrew A. Herzing,Masashi Watanabe,Christopher J. Kiely,David W. Knight,Graham J. Hutchings +9 more
TL;DR: It is shown that Au/Pd-TiO2 catalysts give very high turnover frequencies (up to 270,000 turnovers per hour) for the oxidation of alcohols, including primary alkyl alcohols and the addition of Au to Pd nanocrystals improved the overall selectivity.
Journal ArticleDOI
Identification of Active Gold Nanoclusters on Iron Oxide Supports for CO Oxidation
Andrew A. Herzing,Christopher J. Kiely,Albert Frederick Carley,Philip Landon,Graham J. Hutchings +4 more
TL;DR: High catalytic activity for carbon monoxide oxidation is correlated with the presence of bilayer clusters that are ∼0.5 nanometer in diameter and contain only ∼10 gold atoms, consistent with that demonstrated previously with the use of model catalyst systems.
Journal ArticleDOI
When Gold Is Not Noble: Nanoscale Gold Catalysts
A. Sanchez,Stéphane Abbet,Ueli Heiz,Wolf-Dieter Schneider,Hannu Häkkinen,Robert N. Barnett,Uzi Landman +6 more
TL;DR: In this article, temperature-programmed reaction studies of the catalyzed combustion of CO on size-selected small monodispersed Aun (n ≤ 20) gold clusters supported on magnesia, and first-principle simulations reveal the microscopic origins of the observed unusual catalytic activity, with Au8 being the smallest catalytically active size.