作　　者： ; ; ; ; (邵丽敏）;

机构地区： 河北师范大学化学与材料科学学院

出　　处： 《河北师范大学学报（自然科学版）》 2014年第3期272-277,共6页

摘　　要： 以高锰酸钾和硫代硫酸钠为前驱物,采用氧化还原沉淀法可控制备了α-MnO2纳米颗粒,并以邻二甲苯为目标污染物评价了α-MnO2纳米颗粒对其深度催化氧化性能的影响.考察了pH值、反应物的摩尔比、焙烧温度对催化剂结构和活性的影响.采用X射线衍射、扫描电子显微镜和比表面积分析仪对催化剂进行了表征.结果发现,该类α-MnO2纳米颗粒的催化活性和稳定性良好,在400~700℃保持晶型稳定,粒径为25~50nm.其中,当反应原料的反应摩尔比为8∶3、pH=5、焙烧温度400℃时所制备的催化剂可在220℃时使0.06%（体积分数）的邻二甲苯完全转化为CO2和H2O,表现出最好的催化活性,并且其活性在连续60h的测试中保持稳定. α-MnO2nanoparticles were prepared by using redox-precipitation reaction method,in which the KMnO4 and Na2S2O3 were used as the precursors.The paper inspected the reaction mechanism of α-MnO2on catalytic combution o-xylene.Effects of pH,molar ratio of reactants,and calcination temperature on its catalytic activity were investigated.The X-ray diffraction（XRD）,brunauer emmett teller（BET）, scanning electron microscope（SEM）were used to characterize these catalysts.The results found that theα-MnO2nanoparticles showed good thermal stability and good catalytic activity.The catalyst keep stable crystal shape from 400to 700℃and its particle size is between 25to 50nm.Among them,α-MnO2nanoparticles which were prepared at the condition of the raw materials for reaction molar ratio is 8∶3,pH=5,and calcination temperature is 400℃,can make 0.06%o-xylene completely transformed into water and carbon dioxide at 220℃,and showed the best catalytic activity.The catalyst remained stable after a continuous activity test 60h.

关 键 词： 纳米颗粒 邻二甲苯 深度催化氧化

领　　域： [理学] [理学]