Catalytic Performance of MnOx Nanorods in Aerobic Oxidation of Benzyl Alcohol |
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Authors: | Jing Yang Qing Hua Su-jie Chang Xian-qin Yu Yun-sheng Ma Wei-xin Huang |
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Institution: | 1.Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China2.Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, China;Hefei National Laboratory for Phys |
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Abstract: | Various manganese oxide nanorods with similar one-dimensional morphology were prepared by calcination of MnOOH nanorods under different gas atmosphere and at different temper-atures, which were synthesized by a hydrothermal route. The morphology and structure of MnOx catalysts were characterized by a series of techniques including X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and tempera-ture programmed reduction (TPR). The catalytic activities of the prepared MnOx nanorods were tested in the liquid phase aerobic oxidation of benzyl alcohol, which follow a sequence as MnO2>Mn2O3≈Mn3O4>MnOOH with benzaldehyde being the main product. On the basis of H2-TPR results, the superior activity of MnO2 is ascribed to its lower reduction temperature and therefore high oxygen mobility and excellent redox ability. Moreover, a good recycling ability was observed over MnO2 catalysts by simply thermal treatment in air. |
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Keywords: | Manganese oxides Nanorod Oxidation of benzyl alcohol X-ray photoelectron spectroscopy H2-TPR |
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