Issue 5, 2014

Selective oxidation of cyclohexene to adipic acid over silver supported tungsten oxide nanostructured catalysts

Abstract

We have developed a new synthesis strategy to prepare ∼5 nm metallic silver nanoparticles (AgNPs) supported on tungsten oxide (WO3) nanorods with diameters between 40 and 60 nm in the presence of a cationic surfactant, cetyltrimethylammonium bromide (CTAB). The catalyst was characterized by XRD, XPS, ICP-AES, FT-IR, Raman spectroscopy, EXAFS, SEM and TEM. The catalyst is very effective in liquid phase oxidation of cyclohexene to adipic acid with hydrogen peroxide as an oxidant. The synergy between the surface AgNPs and WO3 nanorods plays the most vital role towards this very high catalytic activity. The reusability of the catalyst which is a prerequisite for practical applications was analysed and it was found that the catalyst exhibits no significant changes in its catalytic activity even after five cycles of reuse. A cyclohexene conversion of >99.9% with an adipic acid selectivity of ∼94% was achieved over ∼5 nm AgNPs supported on the WO3 nanorod catalyst with a very high turnover frequency of ∼12 h−1.

Graphical abstract: Selective oxidation of cyclohexene to adipic acid over silver supported tungsten oxide nanostructured catalysts

Supplementary files

Article information

Article type
Paper
Submitted
24 Jan 2014
Accepted
06 Mar 2014
First published
06 Mar 2014

Green Chem., 2014,16, 2826-2834

Selective oxidation of cyclohexene to adipic acid over silver supported tungsten oxide nanostructured catalysts

S. Ghosh, S. S. Acharyya, S. Adak, L. N. S. Konathala, T. Sasaki and R. Bal, Green Chem., 2014, 16, 2826 DOI: 10.1039/C4GC00130C

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