凹凸棒石负载的Cu-Mn-Ce催化剂上甲苯氧化反应性能  

Performance of Palygorskite Supported Cu-Mn-Ce Catalyst for Catalytic Oxidation of Toluene

作　　者：宋磊[1] 陈天虎[1] 李云霞[1] 刘海波[1] 孔德军[1] 陈冬[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《催化学报》2011年第4期652-656,共5页

基　　金：国家高技术研究发展计划(863计划;2007AA06Z118);高等学校博士学科点专项科研基金(2009JYXJ0547)~~

摘　　要：采用浸渍法制备了凹凸棒石(PG)负载Cu-Mn-Ce催化剂,运用X射线衍射、透射电镜和H2程序升温还原等方法对催化剂进行了表征,并将催化剂用于氧化降解甲苯反应中,考察了不同活性组分、Ce添加量以及催化剂焙烧温度对催化剂活性的影响,探讨了催化剂中活性组分的存在形式及与催化氧化活性的关联.结果表明,催化剂中Cu,Mn和Ce分别以CuO,Mn2O3和CeO2的形式负载于棒状结构的PG表面,且呈高度分散的纳米颗粒.Ce的添加促进了CuMn2O4尖晶石结构的形成,且显著提高了甲苯转化率.当Ce/Cu摩尔比为0.3且在500oC焙烧时催化剂活性最高,288oC时甲苯转化率达到了99%.A series of Cu-Mn catalyst samples with Ce additive supported on palygorskite （PG） were prepared by the wet impregnation method.The catalyst structure was characterized by X-ray diffraction,transmission electron microscopy （TEM）,and temperature-pro-grammed reduction with H2.The state of various active species and their reducibility were investigated and correlated with catalytic performance of the catalyst.The catalyst activity was examined using toluene as a model volatile organic compound.The effect of different active species,the amount of Ce additive,and catalyst calcination temperature on toluene conversion was investigated.The results demonstrated that the active species of the catalyst were loaded on the surface of PG in the form of CuO,Mn2O3,and CeO2,and highly dispersed nanoparticles of the species were observed by TEM.The addition of Ce improved the growth of spinal CuMn2O4 and increased toluene conversion.When molar ratio of Ce/Cu was 0.3,the catalyst showed the highest activity.Toluene conversion reached 99% over the Cu-Mn-Ce/PG catalyst at 288 oC.

关 键 词：凹凸棒石 铜 锰 铈 催化氧化 挥发性有机污染物 甲苯 

分 类 号：O643.32[理学—物理化学]