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负载型Mn基催化剂催化氧化甲苯的研究
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Abstract:
采用溶胶–凝胶法制备了CeO2和TiO2载体，通过浸渍法制备了Mn/CeO2和Mn/TiO2催化剂，通过催化活性评价和催化表征等方法考察了Mn/CeO2和Mn/TiO2等催化剂氧化甲苯的催化行为。研究表明：催化剂活性为Mn/CeO2 > Mn/TiO2 > TiO2 > CeO2。Mn/CeO2催化剂具有最低的起燃温度(T50 = 180℃)，其在215℃下甲苯的转化效率可稳定在80%。Mn/CeO2和Mn/TiO2等催化剂的活性与催化剂的物化结构、催化剂的活性组分有关。相较于Mn/TiO2，Mn/CeO2具有较大的孔体积和比表面积。Mn/CeO2和Mn/TiO2催化剂的活性组分皆主要为Mn3O4。相较于Mn/TiO2，Mn/CeO2催化剂表面具有较高含量的Mn2+和表面氧(Osurf)。
CeO2 and TiO2 supports were synthetized by sol-gel method, Mn/CeO2 and Mn/TiO2 catalysts were prepared by impregnation method. The catalytic behaviors of Mn/CeO2 and Mn/TiO2 for oxidation of toluene were investigated by catalytic activity evaluation and catalyst characterization. The results show that the activities of catalysts decrease in order of Mn/CeO2 > Mn/TiO2 > TiO2 > CeO2. Mn/CeO2 catalyst has the lowest light-off temperature (T50 = 180？C); the conversion of toluene can reach 80% at 215？C. The activity of Mn/CeO2, Mn/CeO2 and other catalysts is related to the physical and chemical structure and the active component of the catalyst. Compared with Mn/TiO2, Mn/CeO2 has higher pore volume and specific surface area compared with Mn/CeO2. The active component of both Mn/CeO2 and Mn/TiO2 is Mn3O4. Compared with Mn/TiO2, Mn/CeO2 catalyst has a higher concentration of Mn2+ and Osurf.
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