Preparation of MnOx/TiO2 composites and their properties for catalytic oxidation of chlorobenzene.
Preparation of MnOx/TiO2 composites and their properties for catalytic oxidation of chlorobenzene.
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DOI：
10.1016/j.jhazmat.2009.12.116
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发表时间：
2010-05
影响因子：
13.6
通讯作者：
W. Tian;Xiaoyu Fan;Hangsheng Yang;Xiaobin Zhang
中科院分区：
文献类型：
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作者：
W. Tian;Xiaoyu Fan;Hangsheng Yang;Xiaobin Zhang
分别采用溶胶-凝胶法、溶剂热法和共沉淀法制备了不同Mn/Ti原子比的MnOx/TiO 2复合材料。在固定床流动反应器中对15种催化剂的氯苯去除能力进行了比较。实验结果表明，当Mn/Ti原子比达到1：4时，3种方法制备的催化剂的活性均达到最高值，尤其是在100 ~ 300°C温度范围内，Mn/Ti原子比为1：4的溶胶-凝胶法制备的催化剂的活性高于其他方法制备的催化剂。通过XRD、SEM、EDS、BET和TPR等表征手段对催化剂的微观结构进行了表征，结果表明，溶胶-凝胶法制备的催化剂中TiO 2的晶相为金红石型和金红石型，锰氧化物的分散性较好，具有较好的催化性能。
MnOx/TiO2composites with different atomic ratio of Mn/Ti were prepared by sol–gel, solvothermal and coprecipitation method, respectively. The catalytic tests on chlorobenzene (CB) removal ability of all 15 catalysts were performed in a fixed-bed flow reactor and compared to each other. Experimental results showed that when the atomic ratio of Mn/Ti reached 1:4, the activity of the catalysts prepared by three methods reached their highest value, particularly the catalyst with the Mn/Ti atomic ratio of 1:4 prepared by sol–gel method showed higher catalytic activity than the catalysts with the same atomic ratio prepared by other methods at temperature between 100 and 300°C. From the microstructure characterization by XRD, SEM, EDS, BET, and TPR, it could be known that the combined TiO2phases of anatase and rutile and a good dispersion of manganese oxides contributed to a good catalytic performance in the catalyst prepared by the sol–gel method.