不同形貌氧化锰催化降解甲苯的性能研究  

CATALYTIC DECOMPOSITION OF TOLUENE BY MANGANESE OXIDES WITH DIFFERENT MORPHOLOGIES

作　　者：廖银念[1,2] 张璇[1] 牛文浩 赵梦奇[1] 苏玉红[1] 

机构地区：[1]新疆大学化学化工学院,乌鲁木齐830046 [2]新疆大学煤炭清洁转化与化工过程自治区重点实验室,乌鲁木齐830046

出　　处：《环境工程》2018年第1期62-66,共5页Environmental Engineering

基　　金：国家自然科学基金项目(51408522;51403179);新疆维吾尔自治区自然科学基金资助项目(2015211C284);新疆大学博士启动基金资助项目(BS150222)

摘　　要：通过简单的无模板和无表面活性剂的水热法成功制备了棒状、花球、八面体和颗粒状氧化锰纳米材料。对产物通过场发射扫描电镜(FE-SEM)和X-射线粉末衍射(XRD)进行了表征,并研究了产物晶型和形貌对甲苯氧化反应催化活性的影响。FE-SEM和XRD结果表明:成功合成了氧化锰纳米材料棒状、花球状、八面体和颗粒等多种形貌,棒状和花球状产物具有MnO_2和Mn_2O_3两种晶型,而八面体和颗粒状产物只有Mn_3O_4一种晶型。催化活性测试结果表明:产物的催化活性很大程度上取决于催化剂的形貌,4种形貌的产物活性都大于商用Mn_3O_4。其中,棒状氧化锰的催化活性最高。研究结果可为设计更高效的氧化锰催化剂去除挥发性有机物提供重要参考。Manganese oxide nanostructures with different morphologies including nanorods,flower-like microspheres,octahedrals and nanoparticles were prepared by a facile hydrothermal method with non-templates and non-surfactants.The obtained nanostructures were characterized by field emission scanning electron microscope（FE-SEM） and X-ray powder diffraction（XRD）.The effect of the crystal structure and morphology on the catalytic activity was investigated.The catalytic activities of catalysts were evaluated by toluene catalytic combustion in air.FE-SEM and XRD analysis showed that the nanorods,flower-like nanosphere,octahedral and nanoparticles had been successfully synthesized.Nanorods and flower-like nanosphere had MnO_2 and Mn_2O_3 crystal types,and octahedral and nanoparticles only had Mn_3O_4 crystal type.It was found that the catalytic activity of products was strongly affected by its morphology.The activity of four different morphologies was higher than the commerical Mn_3O_4.Nanorods exhibited the highest catalytic activity.These results provided an important basis for the design of highly efficient manganese oxide catalysts for removal of volatile organic compounds.

关 键 词：氧化锰 催化氧化 甲苯 形貌 

分 类 号：X701[环境科学与工程—环境工程]