摘要
采用沉淀氧化法制备了Co3O4/CeO2催化剂,运用XRD,BET,TPR（程序升温还原）表征手段,考察了不同钴铈比及焙烧温度对钴铈复合氧化物物理及化学性能的影响,分别在干、湿条件下进行了一氧化碳氧化反应研究。结果表明,铈的加入使Co3O4的粒径变小,经723K温度焙烧制得的钴铈比为9：1的复合氧化物中Co3O4的平均粒径为9.5nm,BET比表面积为119.8m^2/g。干燥条件下,Co3O4的活性优于钴铈复合氧化物,而当反应气中存在湿气时,适当比例的铈的添加起到了抑制湿气的作用,较纯Co3O4活性更好。
Co3O4/CeO2 catalysts are prepared through co-precipitation-oxidation method and characterized using X-ray diffraction （XRD）, specific surface areas （SSA） and temperature-programmed reduction （TPR）. Effect of the cobalt content on the physical and chemical performance on the compound oxide is reviewed. The carbon monoxide oxidation is investigated in humid and dry conditions. It is found that the addition of CeO2 can decrease the crystallite size of Co3O4, the particle sizes of Co3O4 in the Co3O4/CeO2 composite （Co to Ce atomic ratio =9 /1） is calcined at 723 K and calculated to be 9.5 nm on average and the SSA surface area is 119.8 m^2/g. Under dry condition, Co3O4 displays higher activity than Co3O4/CeO2 composite for CO oxidation. On the contrary, Co3O4/CeO2 （Co to Ce atomic ratio =9/1） catalyst exhibits better resistance to moisture than pure Co3O4 does.
出处
《装甲兵工程学院学报》
2007年第4期76-79,共4页
Journal of Academy of Armored Force Engineering
