Nanostructured RuO sub(2) on MWCNTs: Efficient catalyst for transfer hydrogenation of carbonyl compounds and aerial oxidation of alcohols

Multiwall carbon nanotubes (MWCNTs)/ruthenium dioxide nanoparticles (RuO sub(2)NPs) composite was prepared by a straightforward 'dry synthesis' method. After being well characterized, the prepared composite was used as a nanocatalyst (RuO sub(2)/MWCNT) for the transfer hydrogenation of car...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2014-08, Vol.484, p.84-96
Main Authors: Gopiraman, M, Babu, S Ganesh, Karvembu, R, Kim, I S
Format: Article
Language:English
Subjects:
Alcohols
Carbonyl compounds
Catalysis
Catalysts
Hydrogenation
Nanostructure
Oxidation
Ruthenium oxide
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Summary:Multiwall carbon nanotubes (MWCNTs)/ruthenium dioxide nanoparticles (RuO sub(2)NPs) composite was prepared by a straightforward 'dry synthesis' method. After being well characterized, the prepared composite was used as a nanocatalyst (RuO sub(2)/MWCNT) for the transfer hydrogenation of carbonyl compounds. The excellent adhesion of RuO sub(2)NPs on the anchoring sites of MWCNTs was confirmed by TEM and Raman analyses. The weight percentage (7.97 wt%) and the chemical state (+4) of Ru in RuO sub(2)/MWCNT was confirmed by EDS and XPS analyses, respectively. It was found that the RuO sub(2)/MWCNT has a higher specific surface area of 189.3 m super(2) g super(-1). Initially the reaction conditions were optimized and then the scope of the catalytic system was extended with a wide range of carbonyl compounds. The influence of the size of RuO sub(2)NPs on the transfer hydrogenation of carbonyl compounds was also studied. The RuO sub(2)/MWCNT is highly chemoselective, heterogeneous in nature, reusable and highly stable. Owing to the high stability of the used catalyst (u-RuO sub(2)/MWCNT), it was further calcinated at high temperature to obtain RuO sub(2) nanorods (NRs) hybrid MWCNTs. Then the hybrid material was used as a catalyst (r-RuO sub(2)/MWCNT) for the aerial oxidation of alcohols and the result was found to be good.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2014.06.032