Issue 25, 2015

Efficient and recyclable multi-cationic polyoxometalate-based hybrid catalyst for heterogeneous cyclohexane oxidation with H2O2

Abstract

A polyoxometalate-based organic–inorganic hybrid was prepared by ionic self-assembly of the ionic liquid precursor N,N′-bis-2-aminoethyl-4,4′-bipyridinium dibromide dihydrobromide ([DPyAM]Br2·2HBr) with the Keggin-structured V-substituted polyoxometalate H5PMo10V2O40 (H5PMoV2). The composition, electronic and porous structure of the resultant hybrid [DPyAM(H2)]1.25PMoV2 were demonstrated by CHN elemental analysis, 1H NMR, TG, SEM, XRD, FT-IR, UV-vis, ESR, and nitrogen sorption techniques. Catalytic tests showed that the hybrid was a highly active heterogeneous catalyst for cyclohexane oxidation with hydrogen peroxide, giving a yield of KA oil (a mixture of cyclohexanol and cyclohexanone) of ca. 29.4% with high turnover number (TON) of 2940 using very low catalyst dose (0.01 mol% vs. substrate). The catalyst can be conveniently separated by filtration and reused without observing a significant decrease in activity. The influences of reaction conditions were systematically investigated and a possible catalysis mechanism was proposed for understanding the highly efficient heterogeneous catalytic behavior.

Graphical abstract: Efficient and recyclable multi-cationic polyoxometalate-based hybrid catalyst for heterogeneous cyclohexane oxidation with H2O2

Supplementary files

Article information

Article type
Paper
Submitted
07 Dec 2014
Accepted
06 Feb 2015
First published
09 Feb 2015

RSC Adv., 2015,5, 19306-19314

Efficient and recyclable multi-cationic polyoxometalate-based hybrid catalyst for heterogeneous cyclohexane oxidation with H2O2

S. Xue, G. Chen, Z. Long, Y. Zhou and J. Wang, RSC Adv., 2015, 5, 19306 DOI: 10.1039/C4RA15921G

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