Abstract: Catalytic wet air oxidation (CWAO) of o-chlorophenol in wastewater was studied in a stainless steel autoclave using four different Fe catalysts in the temperature range of 100–200 °C. Experimental results showed that high rate of o-chlorophenol and COD_Cr (Chemical Oxygen Demand, mg/L) removal by CWAO was obtained at relatively low temperature and pressure. The catalysts Fe₂(SO₄)₃, FeSO₄, Fe₂O₃ and FeCl₃ all exhibited high catalytic activity. More than 93.7% of the initial COD_Cr and nearly 100% of o-chlorophenol were removed at 150 °C after 150 min with FeSO₄ as catalyst. The CWAO of o-chlorophenol was found to be pseudo-first order reaction with respect to o-chlorophenol, with activation energy of 75.56 kJ/mol in the temperature range of 100–175 °C.

Key words: Fe, o-chlorophenol, Catalytic wet air oxidation, Kinetic

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