纳米片
掺杂剂
电子顺磁共振
氧气
拉曼光谱
材料科学
空位缺陷
硫黄
无机化学
吸附
兴奋剂
化学工程
光化学
化学
纳米技术
物理化学
结晶学
有机化学
冶金
光电子学
核磁共振
工程类
物理
光学
作者
Xiaohai Zheng,Yanli Liu,Weilong You,Ganchang Lei,Yanning Cao,Yongfan Zhang,Lilong Jiang
标识
DOI:10.1016/j.cej.2021.132917
摘要
Introduction of surface oxygen vacancy (Vo) has been proved to be a powerful method to promote the performance of H2S selective oxidation by improving H2S adsorption and O2 activation. Nevertheless, maximizing the oxygen vacancy concentration remains a challenge due to limited exposed surface. Herein, we report a Fe-doped TiO2−x ultrathin nanosheet with abundant oxygen vacancies for H2S selective oxidation via a facile citric acid assisted hydrothermal process. One of the cheapest and most abundant metals, iron, is a desirable dopant for further promoting the H2S oxidation activity of TiO2. As a result, the Fe-doped TiO2−x nanosheets endowed with abundant oxygen vacancies exhibited nearly 100% H2S conversion and sulfur selectivity at 210 °C and is superior to those of most reported Ti-based materials. Furthermore, through in situ DRIFTS, in situ Raman and EPR spectra of H2S oxidation, the reaction pathway for selective oxidation of H2S over Fe-doped TiO2−x with abundant oxygen vacancies was revealed. The density functional theory (DFT) calculations were conducted to get a deeper insight into the effect of Fe-doping on the electronic structure and oxygen vacancy of defected TiO2.
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