Applications of a high performance platinum nanocatalyst for the oxidation of alcohols in water

Maity, Prasenjit ; Gopinath, Chinnakonda S. ; Bhaduri, Sumit ; Lahiri, Goutam Kumar (2009) Applications of a high performance platinum nanocatalyst for the oxidation of alcohols in water Green Chemistry, 11 (4). pp. 554-561. ISSN 1463-9262

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Nanoparticles of platinum (NP-Pt), have been synthesized by supporting high nuclearity anionic carbonylcluster (Chini cluster) on a water soluble anion exchanger, and the performance of this material, 1, as an oxidationcatalyst 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 platinumcatalysts. These are platinum nanoparticles2 prepared by the hydrogenreduction of [PtCl6]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 (~1000 and ~165 for benzyl alcohol and 1-phenyl ethanol, respectively) partial deactivation ( ~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.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:61926
Deposited On:15 Sep 2011 12:16
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