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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119.8m2/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 were prepared by precipitation oxidation method. The effects of different cobalt-cerium ratio and calcination temperature on the physical and chemical properties of cobalt-cerium composite oxide were investigated by XRD, BET and TPR (temperature programmed reduction) , Under wet conditions for carbon monoxide oxidation reaction. The results show that the particle size of Co3O4 decreases with the addition of cerium. The average particle diameter of Co3O4 in the composite oxide with a 9: 1 ratio of cobalt to cerium calcined at 723K is 9.5 nm, and the BET specific surface area is 119.8 m2 / g . Under the dry conditions, the activity of Co3O4 is better than that of cobalt-cerium composite oxide. When there is moisture in the reaction gas, the addition of proper proportion of cerium plays the role of inhibiting moisture, which is better than that of pure Co3O4.