Catalytic Wet Air Oxidation of Aqueous Solutions of Substituted Phenols

Abstract

Catalytic wet air oxidation (CWAO) of aqueous solutions of phenol, 2-chlorophenol and 4-nitrophenol were studied using Cu/ CeO 2 with 4% of copper as catalytic material. The catalyst was prepared by an impregnation method and characterized by X-ray diffraction (XRD), BET surface area, oxygen storage capacity (OSC), temperature programmed reduction (TPR), electron paramagnetic resonance (EPR) and XPS. The reaction was carried out in a batch reactor at T=160°C and 1.0 MPa. Cu/CeO 2 catalyst was found effective in CWAO. On the basis of characterization data, it is suggested that the high activity of the copperceria catalyst is related to the modification of the structural and redox properties of the cerium oxide on copper addition. The ratio BOD 5 /COD was measured to evaluate the biodegradability. Pretreatment by CWAO under operating conditions resulted in effluents whose biodegradation rates were significantly higher than those of the original.

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

“…When this was done, little 4-NP was adsorbed to the catalyst. As shown in Fig 6A, complete reduction of 4-NP occurred in 160 s, which is faster than previously reported rates (Zeng et al, 2013;Chu et al, 2011;Posada et al, 2006;Liu et al, 2013;Yao et al, 2015). We did experiment to investigate the adsorption effect in the absence of Cu/ Cu 2 O/CuO@C, the result showed that UV-vis adsorption spectra of 4-NP didn't change during 10 h with the addition of NaBH4 (Fig.…”

Wet oxidative method for removal of 2,4,6-trichlorophenol in water using Fe(III), Co(II), Ni(II) supported MCM41 catalysts

“…Posada et al [26] have shown catalytic wet air oxidation of aqueous solutions of phenol, 2-chlorophenol (2CP) and 4-nitrophenol (4NF) by using Cu/CeO 2 as the catalyst. These workers achieved complete degradation of phenol and 2-chlorophenol respectively in 100 and 130 min, and about 60% destruction with 4-nitrophenol in 200 min.…”

Heterogeneous catalytic wet air oxidation of refractory organic pollutants in industrial wastewaters: A review

“…The performance of 4 wt% Cu/CeO 2 catalyst for the CWAO of phenol, o-chlorophenol, and p-nitrophenol was investigated by Posada et al [79]. Under 160 • C and 1 MPa, complete conversion of phenol and o-cholophenol were achieved after 100 min and 130 min, respectively, but only about 60% of p-nitrophenol was degraded after 200 min.…”