【摘要】 以硝酸钴和硝酸铈为前驱物,SBA-15为硬模板,利用双溶剂法制备了Co3O4-CeO2介孔复合氧化物,通过X-射线衍射、N2吸脱附测试、程序升温还原和透射电子显微镜等技术对活性组分及载体进行了表征,并且与浸渍法和共沉淀法所制备的催化剂进行了对比分析.结果表明,相比于浸渍法和共沉淀法,采用双溶剂法制备的介孔Co3O4-CeO2复合氧化物具有均匀的介孔结构、较小的颗粒尺寸、较大的比表面积和较高的活性组分分散度.此外,CO氧化脱除评价显示与常规的共沉淀法和浸渍法所制备的催化剂相比该介孔复合氧化物具有较高的反应活性和选择性,其高活性主要归因于较高的比表面积和活性组分的高分散度.更多还原

【Abstract】 Mesoporous Co3O4-CeO2 mixed oxides was synthesized by a bi-solvent method in which SBA-15 was introduced as the hard template and cerium nitrate and cobalt nitrate were wed as precursors.The active composite and support were characterized by techniques of X-ray powder diffraction,nitrogen adsorption/desorption,temperature programmed reduction and transmission electron microscopy.The experimental results show that the catalyst prepared by the bi-solvent method displayed the uniform mesoporous structure,the smaller particle size,the higher surface area and the high dispersion of active composites compared with the catalysts prepared by impregnation and co-precipitation methods.In addition,the as-prepared mesoporous Co3O4-CeO2 showed a superior performance of CO oxidation over catalysts prepared by traditional preparation protocols of impregnation method and coprecipitation method,which can be ascribed to the high surface area and high dispersion of the catalyst.更多还原