负载型Mn基催化剂催化氧化甲苯的研究  

Study on the Catalytic Oxidation of Toluene by Mn-Based Supported Catalysts

作　　者：杨仲余 潘华 毛益萍 王晟康 张鼎盛 王莉[1] 

机构地区：[1]浙江树人大学生物与环境工程学院,浙江杭州

出　　处：《化学工程与技术》2019年第4期305-312,共8页Hans Journal of Chemical Engineering and Technology

基　　金：浙江省自然科学基金资助项目(LY19E080023);浙江树人大学中青年学术团队项目(XKJ0516205);浙江树人大学科研启动基金资助项目(KXJ0517102);国家级大学生创新创业训练计划项目(201811842020)。

摘　　要：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.

关 键 词：甲苯 催化氧化 锰基催化剂 

分 类 号：O64[理学—物理化学]