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  4. Shape- and Size-Selective Preparation of Hectorite-Supported Ruthenium Nanoparticles for the Catalytic Hydrogenation of Benzene
 
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Shape- and Size-Selective Preparation of Hectorite-Supported Ruthenium Nanoparticles for the Catalytic Hydrogenation of Benzene

Auteur(s)
Süss-Fink, Georg 
Institut de chimie 
Editeur(s)
Khan, Farooq-Ahmad
Boudon, Julien
Spassov, Vladislav
Date de parution
2009
In
Journal of Cluster Science, Springer, 2009/20/2/341-353
Mots-clés
  • Ruthenium nanoparticl...

  • Ruthenium-modified he...

  • Benzene hydrogenation...

Résumé
The cationic organometallic aqua complexes formed by hydrolysis of [(C<sub>6</sub>H<sub>6</sub>)<sub>2</sub>RuCl<sub>2</sub>]<sub>2</sub> in water, mainly [(C<sub>6</sub>H<sub>6</sub>)Ru(H<sub>2</sub>O)<sub>3</sub>]<sup>2+</sup>, intercalate into white sodium hectorite, replacing the sodium cations between the anionic silicate layers. The yellow hectorite thus obtained reacts in water with molecular hydrogen (50 bar, 100 °C) to give a dark suspension containing a black hectorite in which large hexagonally shaped ruthenium nanoparticles (20–50 nm) are intercalated between the anionic silicate layers, the charges of which being balanced by hydronium cations. If the reduction with molecular hydrogen (50 bar, 100 °C) is carried out in various alcohols, spherical ruthenium nanoparticles of smaller size (3–38 nm depending on the alcohol) are obtained. In alcohols other than methanol, the reduction also works without H<sub>2</sub> under reflux conditions, the alcohol itself being the reducing agent; the ruthenium nanoparticles obtained in this case are spherical and small (2–9 nm) but tend to aggregate to form clusters of nanoparticles. Whereas the ruthenium nanoparticles prepared by reduction of the yellow hectorite in refluxing alcohols without hydrogen pressure are almost inactive, the nanoparticles formed by hydrogen reduction catalyze the hydrogenation of benzene to give cyclohexane under mild conditions (50 °C) with turnover frequencies up to 6500 catalytic cycles per hour, the best solvent being ethanol.
URI
https://libra.unine.ch/handle/123456789/13286
DOI
10.1007/s10876-009-0246-5
Autre version
http://dx.doi.org/10.1007/s10876-009-0246-5
Type de publication
Resource Types::text::journal::journal article
Dossier(s) à télécharger
 main article: S_ss-Fink_Georg_-_Shape-_and_Size-Selective_Preparation_of_Hectorite_20100622.pdf (852.19 KB)
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