Journal
GREEN CHEMISTRY
Volume 17, Issue 3, Pages 1867-1876Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4gc02123a
Keywords
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Funding
- CSIR, India
- CSIR, New Delhi [CSC-0125, CSC 0117]
- KEK-IMSS-PF [2013G210]
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Heterogeneous catalysts comprising silver nanoparticles supported on nanostructured tungsten oxide were applied for room temperature oxidative coupling of aniline to azoxybenzene, an important chemical intermediate and a chemical of industrial interest. The catalytic protocol features high activity and selectivity to the target product azoxybenzene with a turnover number of similar to 368. The catalyst was characterized by XRD, XPS, ICP-AES, FT-IR, TGA, EXAFS, SEM and TEM. The silver-tungsten nanomaterial acts as an excellent catalyst for selective oxidation of aniline to azoxybenzene using H2O2 as an oxidant. An aniline conversion of 87% with 91% selectivity of azoxybenzene was achieved without the use of any external additives. Moreover, a high stability and recyclability of the catalyst is also observed under the investigated conditions.
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