负载Cu金属有序介孔氧化铝催化剂的制备及表征

Preparation and characterization of Cu catalysts supported on organized mesoporous alumina

采用等体积浸渍和原位合成方法以硝酸铝作为铝源,聚乙二醇1540为模板剂,磷酸氢二铵为辅助剂,硝酸铜为铜源,制备出负载铜金属有序介孔氧化铝催化剂,并采用氮等温吸附—脱附线、透射电镜、X射线衍射、热失重分析多种测试技术对合成催化剂的物理化学性质和结构特征进行了表征。实验结果表明,两种方法均可以制备出比表面积大(大于210m2/g)、孔径分布窄(4nm左右)的负载铜金属介孔氧化铝催化剂。与等体积浸渍法相比,原位合成法所制备的负载Cu金属有序介孔氧化铝金属铜在载体上的分布更均匀,铜离子与载体的相互作用力更强,且孔结构的有序性较好。

Cu catalysts supported on organized mesoporous alumina （Cu-Al2O3） have been prepared by an equivalent-volume incipient wetness impregnation method and an in situ synthesis method. Aluminum nitrate was used as the source of alumina, PEG1540 as template, monoammonium phosphate as co-solvent and copper was provided by cupric nitrate. The physicochemical and structural properties of the resulting catalysts were investigated by BET, TEM, XRD and TG. The results showed that Cu-Al2O3 with high surface area （〉210 m^2/g） and narrow pore size distribution （about 4 nm） could be synthesized bY both the in situ synthesis method and the equivalent-volume method. The interaction between the metal and the carrier was stronger in Cu-Al2O3 synthesized bythe in situ synthesis method than in the sample prepared by the equivalent-volume method, and the pore structure was shown to be organized to some degree.