Decomposition of hexachlorobenzene over Al2O3 supported metal oxidecatalysts |
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Authors: | ZHANG Lifei ZHENG Minghui ZHANG Bing LIU Wenbin GAO Lirong BA Te REN Zhiyuan SU Guijin |
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Affiliation: | 1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;Sino-Japan Friendship Center for Environmental Protection, Beifing 100029, China 2. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China |
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Abstract: | Decomposition of hexachlorobenzene (HCB) was investigated over several metal oxides (i.e., MgO, CaO, BaO, La2O3,CeO2, MnO2, Fe2O3 and Co3O4) supported on Al2O3, which was achieved in closed system at a temperature of 300℃. Catalysts were prepared by incipient wetness impregnation with different metal oxides loading and impregnating solvents. The decomposition efficiency of different catalysts for this reaction depends on the nature of the metal oxide used, and Al2O3 supported La2O3 was found to be the most active one. Pentachlorobenzene (PeCB), and all tetrachlorobenzene (TeCB), trichlorobenzene (TrCB), and dichlorobenzene (DCB) isomers were detected after the decomposition reaction, indicating that the decomposition was mainly a dechlorination process. The detection of all lower chlorinated beazenes suggested the complexity of decomposition and the presence of more than one dechlodnation pathway. |
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Keywords: | dechlorination hexachlorobenzene (HCB) alumina metal oxides |
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