CuO-ZnO-Al₂O₃催化剂的制备与表征

Preparation and Characterization of CuO-ZnO-Al2O3 Catalysts

摘要: 以CuO、ZnO和Al₂O₃为原料，采用并流沉淀法制备出CuO-ZnO-Al₂O₃催化剂，并采用BET、XRD和SEM等分析方法对不同样品进行了表征和分析。结果表明，当摩尔比为Cu:Zn:Al = 4.5:4.5:1时，得到的催化剂最大的比表面积为59.21 m²/g，最大孔径为0.42 cm³/g。当XRD图谱中在35.9˚时，CuO和ZnO的特征衍射峰变宽而且弥散，铜、锌分散均匀且相互作用加强。电镜分析显示催化剂成球状基团，CuO、ZnO和Al₂O₃均匀分散在球状基团中。在球状基团中可观察出具有较大的比表面积和孔径的内部孔隙。

Abstract: The CuO-ZnO-Al₂O₃ composite catalysts were prepared with different mole ratios of Cu, Zn and Al via parallel flow process. And BET, XRD and SEM were employed to characterize the prepared samples. It was indicated that when the mole ratio of Cu:Zn:Al was about 4.5:4.5:1, the catalyst had the biggest specific surface area and the biggest pore size, which were 59.21 m²/g and 0.42 cm³/g, respectively. The shape of the characteristic diffraction peak of CuO-ZnO became wide and dispersed from XRD diagram at 35.9˚, which meant that the interaction between Cu and Zn became stronger. Electron microscopy analysis showed that the shape of the catalyst was spherical group, and CuO, ZnO and Al₂O₃ were uniformly dispersed in the spherical groups.