CuO修饰TiO_2纳米管的沉积-沉淀法制备及其催化CO氧化性能

Preparation of Copper Oxide Modified TiO_2 Nanotubes by Deposition-Precipitation Method and Their Catalytic Activity for CO Oxidation

以钛酸纳米管和Cu(NO3)2为前驱体,采用沉积-沉淀法制备CuO修饰TiO2纳米管(CuO/TiO2NTs)。通过TEM(透射电子显微镜)、XRD(X射线衍射)和XPS(X射线光电子能谱)表征材料的结构,并研究制备过程中pH值对所得CuO/TiO2 NTs催化CO氧化活性的影响。研究表明,通过沉积-沉淀法可以制备高活性的CuO/TiO2NTs,随溶液的pH值升高,铜的负载量变少,而且不易被还原的二价铜含量升高,导致催化剂的活性变差。

CuO-modified TiOz nanotubes （CuO/TiOz NTs） were prepared by deposition-precipitation method using hydrogen titanate nanotubes and Cu（NO3 ）2 as precursor. The prepared materials were characterized with trans- mission electron microscopy （TEM）, X-ray diffraction （XRD）, and X-ray photoelectron spectroscopy （XPS）. The in- fluence of solution pH on their catalytic activity for CO oxidation was investigated. Obtained results indicate that CuO/TiOz NTs exhibit high catalytic activity, and the CuO content decreases while unreducible copper （ Ⅱ ） increases with the raise of pH, which results in the decrease of catalytic activity.