【作者】 王斌； 龙柱；

【Author】 WANG Bin~(1,2) LONG Zhu~(1,*) (1.Key Laboratory of Science and Technology of Eco Textiles,Ministry of Education,Jiangnan University, Wuxi,Jiangsu Province,214122;2.State Key Laboratory of Pulp and Paper Engineering,SouthChina University of Technology,Guangzhou,Guangdong Province,510641)

【机构】 江南大学生态纺织教育部重点实验室； 华南理工大学制浆造纸工程国家重点实验室；

【摘要】 为了研究LaMnO₃中A、B位掺杂后纳米颗粒的形貌及催化氧化性能,采用溶胶-凝胶方法分别制备出La_1-xSr_xMnO₃和LaCu_xMn_1-xO₃（x=0.1,0.2,0.3,0.4,0.5）的纳米颗粒。利用X射线衍射仪、扫描电镜及相关软件分析了A、B位不同掺杂纳米颗粒的粒径大小及分布形态。在实验范围内,纳米颗粒的平均粒径在15～21nm之间,均匀性良好。同时研究了对A、B位不同掺杂量纳米颗粒的催化氧化性能,测试结果表明,掺杂过的纳米颗粒均具有良好的催化氧化性能,A、B位均随掺杂量的增加,其催化氧化性能先升高而后下降;x=0.2时催化氧化性能最好,当掺杂量较大时,晶格畸变的影响使其催化性能下降;与A位掺杂的催化剂相比,B位掺杂表现出相对较高的催化活性。更多还原

【Abstract】 In order to study the morphology and catalytic oxidation performance of LaMnO₃ nanoparticle after A or B site doping,the sol-gel methods is applied,the La_1-xSr_xMnO₃and LaCu_xMn_1-xO₃（x=0.1,0.2,0.3,0.4,0.5） nanoparticles are prepared.The diameter of particles and morphology-distribution of naniparticles with different doping amounts are analyzed by X-ray diffraction（XRD）,scan electric microscope （SEM） and related software.With the framework of the experiment,the average diameter of particles is between 16-21nm with better chemical homogeneity.At the same time,the catalytic oxidation of nanoparticle under different doping amounts is also studied.Tests results show that nanoparticle has excellent catalytic oxidation performance,and with the increase of doping amount,the catalytic activity of the particle increase first and decrease afterwards with the increase of A or B site doping amount,the best performance presents at X=0.2 of A or B doping concentration.The effect of lattice deformation arising from the dopants,which leads to the decrease of the catalytic performance,can not be ignored at higher doping concentration anymore.Under the same doping amounts,the catalytic performance of B-site doped is better than A-site.更多还原