Hydrothermal synthesis of leaf-like CeO2 nanosheets and its MnOx/CeO2 composites for catalytic combustion of chlorobenzene
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Leaf-like CeO2 nanosheets with about 50 nm thickness have been successfully synthesized through a facile hydrothermal technique with Ce(NO3)3·6H2O as cerium source, NH4HCO3 as the precipitants, and ethylenediamine as complexant. The morphology of CeCO3OH precursor was used to control the structure of CeO2. Uniform and independent leaf-like CeO2 structures were obtained, and they were made up by a main stem and two groups of symmetric blade. Effect of the reaction time and the amount of ammonium hydrogen carbonate and ethylenediamine were investigated systematically. A series of MnOx/CeO2 were synthesized by incipient-wetness impregnation method and used to test the catalytic combustion of chlorobenzene (CB). The studies of the MnOx/CeO2 template showed that this kind of CeO2 is beneficial to the dispersion of MnOx on CeO2 surface and the doping of Mn can increase the concentration of oxygen vacancy on the surface of catalysts. In addition, XPS result indicated that Oads, Ce3+ and Mn4+ are helpful for oxidation reaction. The Mn/Ce (0.50) has the highest activity, which T90 (temperature at which 90% conversion) is about 236 °C and the conversion was maintained almost 80% for 1000 min, indicating the good stability of this catalyst.
KeywordsLeaf-like CeO2 Morphology CeCO3OH Catalytic combustion Chlorobenzene Nanostructured catalysts
We gratefully acknowledge the funding support of the National Natural Science Foundation of China (Nos. 21471120 and 21603168), International Cooperation Foundation of Hubei Province (2012IHA00201), Educational Commission of Hubei Province of China (T201306), and Scientific Research Foundation of Wuhan Institute of Technology (K201515).
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Conflicts of interest
The authors declare that they have no conflict of interest.