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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/11680

Title: Applications of a high performance platinum nanocatalyst for the oxidation of alcohols in water
Authors: MAITY, P
GOPINATH, CS
BHADURI, S
LAHIRI, GK
Keywords: catalyzed aerobic oxidation
organic-reactions
molecular-oxygen
asymmetric hydrogenation
nanopalladium catalyst
carbonyl dianions
aqueous-media
nanoparticles
efficient
green
Issue Date: 2009
Publisher: ROYAL SOC CHEMISTRY
Citation: GREEN CHEMISTRY, 11(4), 554-561
Abstract: Nanoparticles of platinum (NP-Pt), have been synthesized by supporting high nuclearity anionic carbonyl cluster (Chini cluster) on a water soluble anion exchanger, and the performance of this material, 1, as an oxidation catalyst for alcohols in water has been studied. The E-factor for the synthesis of NP-Pt by this method has been calculated and compared with that of other NP-Pt recently reported in the literature. With 1 as a catalyst, oxidations of a variety of primary and secondary alcohols by dioxygen are achieved and high turnover numbers and selectivities are obtained. The performances of 1 in the oxidation of benzyl alcohol and 1-phenylethanol are compared with those of three other platinum catalysts. These are platinum nanoparticles 2 prepared by the hydrogen reduction of [PtCl(6)](2-) supported on the same water soluble polymer, 5% Pt on carbon, and 5% Pt on alumina, designated as 3 and 4, respectively. 1 has been found to be considerably more active than 2- 4 and also other reported water soluble platinum nanocatalysts. After many turnovers (similar to 1000 and similar to 165 for benzyl alcohol and 1-phenyl ethanol, respectively) partial deactivation (similar to 40%) is observed, but the deactivated catalyst can be fully regenerated by treatment with dihydrogen. The TEM data of fresh, deactivated and regenerated 1 show a correlation between the particle size and activity. A mechanism consistent with this and other experimental observations including XPS data is proposed.
URI: http://dx.doi.org/10.1039/b815948c
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11680
http://hdl.handle.net/10054/11680
ISSN: 1463-9262
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