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Chemically modified cyclodextrins as supramolecular tools to generate carbon-supported ruthenium nanoparticles: An application towards gas phase hydrogenation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41654 45895 2011 8 PDF Available
Title
Chemically modified cyclodextrins as supramolecular tools to generate carbon-supported ruthenium nanoparticles: An application towards gas phase hydrogenation
Abstract

A series of carbon-supported ruthenium catalysts was synthesized from zerovalent ruthenium nanoparticles stabilized by randomly methylated cyclodextrins (α-, β- and γ-CD) followed by their adsorption onto the carbon support. The catalysts were characterized by N2 physisorption and thermal analyses. The deposited ruthenium nanoparticles were characterized by transmission electron microscopy, which has highlighted predominantly spherical shapes with a mean diameter of 2.4 nm. Catalytic activity was investigated in the gas phase hydrogenation of o-, m- and p-xylene at 85 °C, both separately and in a two-component mixture (o- and p-xylene). The catalyst prepared by a 1:3 concentration ratio of RuCl3 to randomly methylated β-cyclodextrin exhibited the highest hydrogenation activity and stereoselectivity toward the formation of trans-dimethylcyclohexane. The β-cyclodextrin appeared as multifunctional molecular receptors enabling the stabilization and dispersion of the metallic nanoparticles onto the support and the promotion of the catalytic reaction through host–guest interactions.

Graphical abstractZerovalent ruthenium nanoparticles can be efficiently stabilized by randomly methylated cyclodextrins (CDs) from chemical reduction of ruthenium salt in water followed by their adsorption onto a carbon support. The optimization of the Ru-CD catalytic systems has been carried out by evaluating the gas phase hydrogenation of xylenes under mild reaction conditions, tested separately and in a two-component mixture..Figure optionsDownload full-size imageDownload high-quality image (86 K)Download as PowerPoint slideResearch highlights▶ Preparation of ruthenium nanoparticles on activated carbon under mild conditions. ▶ Use of non toxic oligosaccharides as pre-stabilizers. ▶ Enhancement of catalytic performances in xylene hydrogenation at 85 °C. ▶ Best performances with RaMe-β-CD in a single and two-component mixture. ▶ No pre-reduction at high-temperature.

Keywords
Cyclodextrins; Metallic nanoparticles; Activated carbon; Hydrogenation; Gas phase reactions
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Chemically modified cyclodextrins as supramolecular tools to generate carbon-supported ruthenium nanoparticles: An application towards gas phase hydrogenation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 391, Issues 1–2, 4 January 2011, Pages 334–341
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us