络合试剂对溶胶凝胶燃烧法合成LaCoO_3的物化性能及对VOCs催化净化效果的影响  

Influence of complexing agents by sol-gel combustion synthesis on the structural and catalytic properties of LaCoO_3 perovskite for benzene total oxidation

作　　者：魏笑峰[1] 肖益鸿[1] 蔡国辉[1] 郑勇[1] 刘立哲[1] 魏可镁[1] 

机构地区：[1]福州大学化肥催化剂国家工程研究中心,福建福州350002

出　　处：《福州大学学报（自然科学版）》2015年第6期834-838,共5页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省科技重大专项(014H6015);福建省教育厅产学研项目(JA12023);福建省中青年教师教育科研项目(JA13041;JA14060)

摘　　要：分别以甘氨酸、柠檬酸和丙烯酰胺辅助柠檬酸为络合试剂,采用溶胶凝胶燃烧法合成LaCoO_3复合氧化物,并对它们进行XRD、BET、SEM及O_2-TPD分析.实验结果表明,三种络合剂制备得到的产物均为纯钙钛矿LaCoO_3相;丙烯酰胺辅助柠檬酸溶胶凝胶燃烧法制得的LaCoO_3颗粒均匀且较小,比表面积最大,其O_2-TPD曲线中的峰面积最大,对苯完全催化氧化效果最好.LaCoO_3 perovskite- type mixed oxides were prepared by sol- gel combustion method. Glycine,citrate,and acrylamide assisted polymeric citrate were used as complexing agents,respectively.The catalysts were characterized by means of N_2 physical adsorption,X- ray diffraction（ XRD）,scanning electron microscopy（ SEM）,and temperature- programmed desorption of O_2（ O_2- TPD）.The catalytic result reveals that the LC- ACCA catalyst exhibited the highest activity for benzene total oxidation. The XRD result shows that single phase of LaCoO_3 perovskite was obtained by all of these three kinds of complexing agents. The LC- ACCA catalyst had uniform particles with relatively small sizes from SEM observation. Moreover,this catalyst exhibited higher lattice oxygen mobility,as indicated by O_2- TPD measurements. These properties are suggested to be responsible for the high activity in benzene total oxidation.

关 键 词：挥发性有机物 催化燃烧 钙钛矿 溶胶凝胶燃烧法 络合试剂 

分 类 号：X51[环境科学与工程—环境工程]