钐掺杂对锰基催化剂的NO分解性能影响  

Effect of Sm-doping on direct NO decomposition over Mn-based catalyst

作　　者：杨梅君 马艳娇 涂溶[2] 章嵩[2] YANG Meijun;MA Yanjiao;TU Rong;ZHANG Song(The Center for Materials Research and Analysis,Wuhan 430070,Hubei,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,Hubei,China)

机构地区：[1]武汉理工大学材料研究与测试中心,湖北武汉430070 [2]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《化工进展》2018年第12期4687-4692,共6页Chemical Industry and Engineering Progress

基　　金：湖北省创新群体项目(2016CFA006)

摘　　要：采用共沉淀法,以乙酸锰为前体,pH为10,焙烧温度为700℃时,制备得到不同含量钐元素(Sm)掺杂锰基催化剂,研究Sm掺杂对催化剂物相、形貌、比表面积及NO催化转化能力的影响。结果表明:Sm掺杂有利于活性物质MnO2的生成,Sm/Mn摩尔比为0.05时,锰基催化剂在100～700℃的整个温度窗口内,NO的转化率都较高,且在温度高于150℃时NO转化率超过80%。钐嵌入锰晶格形成钐锰固溶体,三价钐取代四价锰,在催化剂中形成阴离子空位,产生缺陷,表面缺陷位增多使得活性位点增加,促进了催化反应。A series of Sm-doped manganese-based catalysts with different molar ratios of Sm/Mn were prepared by co-precipitation method.Their phase,microstructure and catalytic activity were investigated.The results confirm that the doping of samarium can increase the specific surface area,pore volume and pore size of the catalysts,giving rise to an increase in the active sites on the surface of the manganese-based catalyst.When the molar ratio of Sm/Mn=0.05,the conversion of NO reached 80%at 150℃and remained stable during the temperature range of 100℃to 700℃.Samarium embedded the manganese lattice and formed the samarium manganese solid solution.The replacement of Mn4+by Sm3+introduced vacancy and defects into the catalyst which increased the number of surface defect and then promoted the catalytic reaction.

关 键 词：钐掺杂 锰基催化剂 直接分解NO 催化作用 

分 类 号：TB321[一般工业技术—材料科学与工程]