溶胶-凝胶法制备铈钴复合氧化物催化剂的研究

Study of Preparation of Cobalt Cerium Complex Oxides Catalyst by Sol gel Method

用溶胶－凝胶法制备了钴、铈及其复合氧化物催化剂，在以对甲酚氧化制取对羟基苯甲醛的反应中，其催化性能较好。用ＤＴＡ－ＴＧ、ＦＴ－ＩＲ、ＴＥＭ、ＸＲＤ等手段考察了复合氧化物前驱体的热分解行为以及焙烧温度对粒子晶态的影响。结果表明，在２５０℃下恒温焙烧２ｈ，可得到非晶态和高比表面的钴铈复合氧化物超细微粒（ｒ≤３０ｎｍ），且具有良好的保持非晶态结构的热稳定性。

The cobalt, cerium and their complex oxides catalysts were prepared by sol gel method. Its catalytic properties for catalytic oxidation of p cresol to P hydroxybenazadhyde is better. The thermal decomposition behavior of the complex precursors and their phases affected by calcining tempratures were investigated by DTA TG, FT IR, TEM and XRD. The experiment results show that the complex oxides have better amorphous structural thermostability and higher specific surface than those of single composition. The complex precursors was calcined at 250℃ for 2h, the ultrafine powders of complex oxides being sphercal amorphous with 30 nm in average diameter could be obtained.