期刊
CATALYSIS TODAY
卷 124, 期 3-4, 页码 224-231出版社
ELSEVIER
DOI: 10.1016/j.cattod.2007.03.040
关键词
ultrasound; copper; heterogeneous catalyst; Fenton; chlorophenol
A heterogeneous sono-catalytic system with addition of hydrogen peroxide (USH2O2+Cat.) was employed for the degradation of 200 ppm of p-chlorophenol (4-CP) at 25 degrees C and 100 W of ultrasound power. One thousand and six hundred parts per million of initial hydrogen peroxide (H2O2) concentration and 1 g/L of catalyst loading over three heterogeneous copper catalysts, CuO, Cu/Al2O3 (Cu/Al) and CuO center dot ZnO/Al2O3 (Cu/Zn) was used. The benefits of ultrasound in a heterogeneous catalytic system were evaluated. A considerable synergistic effect of the USH2O2+Cat. system was only achieved with supported catalysts (Cu/Al and Cu/Zn) possibly due to good dispersion of catalysts as a result of catalyst size reduction during ultrasound irradiation. Moreover, between the two supported copper catalysts, the Cu/Al provided promising catalytic performance by giving higher 4-CP and TOC removal accompanied with efficient H2O2 consumption. Experiments with a homogeneous copper catalyst revealed that use of ultrasound in a homogeneous system shows an adverse effect on decomposition of 4-CP. (C) 2007 Elsevier B.V. All rights reserved.
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