论文部分内容阅读
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.
CeO 2 and Ce-Sn-O composite oxides doped with a small amount of Sn were prepared by sol-gel method using citric acid and glucose as complexing agents. XRD, TPR, FT-IR, The physical and chemical properties of the four catalysts were characterized and their activity was evaluated by methane catalytic combustion reaction.The results showed that the complete methane conversion temperature of the samples doped with glucose as the complexing agent Low, the specific surface area larger, by transmission electron microscopy, the average grain size of about 14nm, and the dispersion is good, while the citric acid complexing agent compared to the sample showed obvious agglomeration.