caa a22 4500 46325225X CHVBK 20180405153343.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10562-007-9211-9 doi (NATIONALLICENCE)springer-10.1007/s10562-007-9211-9 Competitive Reaction During Decomposition of Hexachlorobenzene Over Ultrafine Ca-Fe Composite Oxide Catalyst [Elektronische Daten] [Xiaodong Ma, Hongwen Sun, Hong He, Minghui Zheng] The decomposition of hexachlorobenzene (HCB) has been investigated over ultrafine Ca-Fe composite oxide catalyst (Ca/Fe atomic ratio was 3.4), CaO and α-Fe2O3 by using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Adsorption experiments on the surface of oxides monitored by in situ DRIFTS showed that partial oxidation products, i.e., phenolate and acetate species were formed on the surface of Ca-Fe composite oxide. The further studies indicated that Ca-Fe composite oxide catalyst was easier to induce the rupture of C-Cl bond and C-C bond of aromatic rings. The best catalytic activity of Ca-Fe composite oxide may be related to the acidity, which was determined by NH3-TPD. The products after reaction have been analyzed by XRD and chloride selective electrode. Ca-Fe composite oxide exhibited the highest extent of mineralization for organic chlorine among the different oxides tested. The combined results of current and previous experiments demonstrated that two competitive reactions took place during the decomposition process of HCB: (1) hydrodechlorination resulting in the formation of lower chlorinated benzenes and (2) oxidation of aromatic rings leading to the rupture of aromaticity and the formation of oxidation products. The latter is the major process in the coexisted competitive reaction. A possible decomposition pathway was discussed. Springer Science+Business Media, LLC, 2007 Competitive reaction nationallicence Decomposition nationallicence Hexachlorobenzene nationallicence Ca-Fe composite oxide nationallicence In situ DRIFTS nationallicence Ma Xiaodong State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085, Beijing, China aut Sun Hongwen Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 300071, Tianjin, China aut He Hong State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085, Beijing, China aut Zheng Minghui State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085, Beijing, China aut Catalysis Letters Springer US; http://www.springer-ny.com 119/1-2(2007-11-01), 142-147 1011-372X 119:1-2<142 2007 119 10562 https://doi.org/10.1007/s10562-007-9211-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10562-007-9211-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ma Xiaodong State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085, Beijing, China aut NATIONALLICENCE 700 1- Sun Hongwen Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 300071, Tianjin, China aut NATIONALLICENCE 700 1- He Hong State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085, Beijing, China aut NATIONALLICENCE 700 1- Zheng Minghui State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085, Beijing, China aut NATIONALLICENCE 773 0- Catalysis Letters Springer US; http://www.springer-ny.com 119/1-2(2007-11-01), 142-147 1011-372X 119:1-2<142 2007 119 10562 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer