催化作用
X射线光电子能谱
漫反射红外傅里叶变换
化学
吸附
光化学
电子转移
电子顺磁共振
氧化剂
解吸
漫反射
超氧化物
光谱学
离子
密度泛函理论
红外光谱学
无机化学
光催化
物理化学
化学工程
核磁共振
有机化学
计算化学
物理
光学
量子力学
工程类
酶
作者
Shule Zhang,Qin Zhong,Yuge Shen,Li Zhu,Jie Ding
标识
DOI:10.1016/j.jcis.2015.02.038
摘要
This study aimed at investigating the reason of high catalytic activity for CeO2–WO3/TiO2 catalyst from the aspects of WO3 interaction with other species and the NO oxidation process. Analysis by X-ray diffractometry, photoluminescence spectra, diffuse reflectance UV–visible, X-ray photoelectron spectroscopy, density functional theory calculations, electron paramagnetic resonance spectroscopy, temperature-programmed-desorption of NO and in situ diffuse reflectance infrared transform spectroscopy showed that WO3 could interact with CeO2 to improve the electron gaining capability of CeO2 species. In addition, WO3 species acted as electron donating groups to transfer the electrons to CeO2 species. The two aspects enhanced the formation of reduced CeO2 species to improve the formation of superoxide ions. Furthermore, the Ce species were the active sites for the NO adsorption and the superoxide ions over the catalyst needed oxidizing the adsorbed NO to improve the NO oxidation. This process was responsible for the high catalytic activity of CeO2–WO3/TiO2 catalyst.
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