Journal of Zhejiang University SCIENCE
(ISSN 1009-3095, Monthly)

2005   Vol. 6B   No. 6   p.569-573

Fe salts as catalyst for the wet oxidation of o-chlorophenol

XU Xin-hua^†, HE Ping, JIN Jian, HAO Zhi-wei

(Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China)
^†E-mail: xhxu@hzcnc.com
Received Dec. 12, 2004; revision accepted Mar. 21, 2005

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
doi:10.1631/jzus.2005.B0569             CLC number: X703; X131