CuO/CeO_2空心球的制备及其对CO的氧化性能研究(英文)

报道了一种利用PS模板制备CuO负载CeO_2空心球的简便方法。用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)、N_2吸附-脱吸等温线和X射线光电子能谱(XPS)对CuO/CeO_2空心球的结构特征进行了表征。为了评价CuO/CeO_2空心球之间的催化性能差异,采用工业CeO_2和CeO_2空心球,H_2温度程序还原(H_2-TPR)和CO氧化试验。结果表明,合成的样品形貌好,比表面积大,纯度高。H_2-TPR分析表明,CuO/CeO_2空心球的还原性具有多种表面活性物。CuO掺杂的CeO_2空心球表现出比CeO_2空心球和商业CeO_2在CO氧化中的更好的性能,因为铜通过氧缺陷的增加和协同效应有效增强了样品对CO催化活性。

Preparation of CuO/CeO2 Hollow Spheres and Study on the Performance of CO Oxidation

A simple and convenient method for preparing CuO-doped CeO₂ hollow spheres via PS templates was presented. The structural characteristics of CuO/CeO₂ hollow spheres were characterized by scanning electron microscopy (SEM), Energy Dispersive Spectrometer (EDS), X-ray diffraction (XRD), N₂ adsorption-desorption isotherm and X-ray photoelectron spectroscopy (XPS). To evaluate the differences of catalytic properties among the CuO/CeO₂ hollow spheres, industrial CeO₂ and CeO₂ hollow spheres, H₂-temperature programmed reduction (H2-TPR) and CO oxidation tests were carried out. The results show that the synthesized samples have good morphology, large specific surface area and high purity. The H₂-TPR analysis reveals that the reducibility of CuO/CeO₂ hollow spheres has diverse surface oxygen species. CuO doped CeO₂ hollow spheres exhibit better performance than CeO₂ hollow spheres and commercial CeO₂ in CO oxidation in that the copper can effectively enhance the catalytic activity of the samples for CO oxidation through the increase of peroxide defects and synergistic effect.