两种络合剂对Ce-Sn-O复合氧化物结构与性能的影响

分别以柠檬酸、葡萄糖为络合剂, 用溶胶-凝胶法制备了CeO2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14 nm 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.

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

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.