两种络合剂对Ce-Sn-O复合氧化物结构与性能的影响  

Influence of Two Complexants on Structure and Performance of Ce-Sn-O Complex Oxides

作　　者：张晓菲[1] 胡瑞生[1] 高官俊[1] 孟和[1] 苏海全[1] 

机构地区：[1]内蒙古大学化学化工学院稀土材料重点实验室,内蒙古呼和浩特010021

出　　处：《物理化学学报》2007年第5期659-663,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20163001);教育部春晖计划项目(Z2004-2-15028);内蒙古自然科学基金(200408020203);内蒙古大学青年科学基金资助

摘　　要：分别以柠檬酸、葡萄糖为络合剂,用溶胶-凝胶法制备了CeO_2和掺杂少量Sn的Ce-Sn-O复合氧化物,利用XRD、TPR、FT-IR、比表面法、TEM等方法表征了四种催化剂的物理化学性质,同时以甲烷催化燃烧反应为探针对其进行了活性评价.结果表明,以葡萄糖为络合剂合成的掺杂锡后的样品其甲烷完全转化温度较低,比表面积较大,通过透射电子显微镜观察,平均晶粒大小为14nm左右,且分散性良好,而相比之下柠檬酸为络合剂合成的样品出现明显的团聚现象.The CeO2 and Ce-Sn-O complex oxides were prepared by sol-gel method using citric acid and glucose as complexing agents, respectively. The complex oxides were characterized by XRD, TPR, FT-IR, BET, and TEM, and their catalytic activities for the combustion of methane were evaluted. The results showed that the Ce-Sn-O complex oxide which used glucose as complexing agent, had lower complete methane conversion temperature and larger specific surface area. The TEM analysis of the Ce-Sn-O complex oxide, which used glucose as complexing agent revealed that the particles had a mean size of 14 nm and better dispersity, while the catalyst which used citric acid as complexing agent was seriously agglomerated.

关 键 词：葡萄糖 柠檬酸 溶胶-凝胶法 甲烷燃烧 

分 类 号：O611.3[理学—无机化学]