Issue 27, 2016

Catalytic oxidation of aromatic amines to azoxy compounds over a Cu–CeO2 catalyst using H2O2 as an oxidant

Abstract

We have prepared Cu-nanoparticles supported on nanocrystalline CeO2 by a one pot hydrothermal method using cetyltrimethylammonium bromide (CTAB) surfactant. The prepared catalyst was characterised by XRD, SEM, TEM, XPS, TPR, EXAFS, BET-surface area and UV-Vis spectroscopy. This prepared catalyst was highly active for the selective oxidation of aromatic amines to corresponding N-oxides with very high yield. It was observed that 5–10 nm Cu-nanoparticles supported on 20–40 nm CeO2 nanoparticles was formed when Cu loading was 3.8 wt%. 3.8 wt% Cu was the optimum loading to give maximum catalytic activity and above 3.8 wt% Cu loading due to the formation of agglomerated Cu species, catalytic activity decreases. The 3.8% Cu–CeO2 catalyst showed 95% aniline conversion and 92% selectivity towards azoxybenzene formation using H2O2 as an oxidising agent. The effect of different reaction parameters like temperature, reaction time, substrates and H2O2 mole ratio were investigated in detail.

Graphical abstract: Catalytic oxidation of aromatic amines to azoxy compounds over a Cu–CeO2 catalyst using H2O2 as an oxidant

Supplementary files

Article information

Article type
Paper
Submitted
02 Dec 2015
Accepted
15 Feb 2016
First published
22 Feb 2016

RSC Adv., 2016,6, 22812-22820

Catalytic oxidation of aromatic amines to azoxy compounds over a Cu–CeO2 catalyst using H2O2 as an oxidant

A. Shukla, R. K. Singha, L. N. S. Konathala, T. Sasaki and R. Bal, RSC Adv., 2016, 6, 22812 DOI: 10.1039/C5RA25699B

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