一步制备高比表面积介孔Co3O4-CeO2及其表征

以有序介孔二氧化硅KIT-6为硬模板,硝酸钴、硝酸铈为金属源,分别在真空辅助条件和普通搅拌条件下制备了介孔CoCeOx复合氧化物。采用XRD、SEM、TEM、N2吸脱附等技术表征了复合氧化物的物化性质,并评价其氧化甲苯的性能。结果表明,在真空辅助和搅拌条件下制备的CoCeOx氧化物是由Co3O4和CeO2组成的介孔Co3O4-CeO2复合氧化物,其比表面积分别为141和89 m^2·g^-1,平均孔径分别为8.7和9.6 nm。真空辅助纳米复制过程有利于金属盐的前驱体充分填充到模板的孔隙中,去除模板后,可以得到有序的介孔复合金属氧化物。所制备介孔钴铈复合氧化物具有孔道有序性好、比表面积大的特点,在挥发性有机化合物的氧化去除方面具有一定的应用前景。

One-Step Preparation and Characterization of High Specific Surface Area Mesoporous Co3O4-CeO2

Using ordered mesoporous silica KIT-6 as hard template,cobalt nitrate and cerium nitrate as metal sources,mesoporous Co Ce Oxcomposite oxides were prepared by impregnation,filling,calcination,template removal and drying under vacuum-assisted conditions and ordinary stirring conditions. The physical and chemical properties of the composite oxides were characterized by XRD,SEM,TEM and N2 adsorption and desorption techniques. The oxidation performance of toluene was evaluated. The results show that the Co Ce Oxoxides prepared under vacuumassisted and stirring conditions are mesoporous Co3O4-CeO2 composite oxides composed of Co3O4 and CeO2. Their specific surface areas are 141 and 89 m^2·g^-1,respectively. The average pore sizes are 8. 7 and 9. 6 nm,respectively.The vacuum-assisted nano-replication process is conducive to the full filling of metal salt precursors into the pores of template KIT-6. The prepared mesoporous cobalt-cerium composite oxide has the characteristics of good pore order and large specific surface area,and has certain application prospects in the oxidation removal of volatile organic compounds.