X射线光电子能谱
反键分子轨道
价(化学)
X射线吸收精细结构
化学
催化作用
结晶学
协调数
掺杂剂
氧化物
氧气
兴奋剂
光化学
材料科学
光谱学
离子
原子轨道
化学工程
有机化学
物理
光电子学
量子力学
工程类
电子
作者
Zhilei Guo,Guohua Jing,Sara A. Tolba,Chung-Shin Yuan,Yuhua Li,Xiaowei Zhang,Zhiwei Huang,Huawang Zhao,Xiaomin Wu,Huazhen Shen,Wenjie Xia
标识
DOI:10.1016/j.cej.2022.138895
摘要
Transition metal oxide (TMO)-decorated TiO2 catalysts excel at low-temperature Hg0 oxidation. However, TMOs are typically found in large nanoparticles (NPs), resulting in a lower atom utilization efficiency. The current paper presents the design of an Au single atom (SA)-doped Ti4+ defected TiO2 (Au SAC-Ti1-xO2) and investigations concerning the influence of an O-Au-O coordination environment on Hg0 oxidation. Au SAC-Ti1-xO2 was designed using an O-Au-O coordination environment and the O-Au-O orbital interaction was elucidated using density functional theory (DFT). The enhanced oxidative capability of lattice oxygen atoms and the interaction between Hg0 and oxygen atoms were investigated. The O-Au-O coordination environment containing Au SAC Ti1-xO2 was then synthesized and characterized using X-ray absorption fine structure (XAFS), X-ray photoelectron spectroscopy (XPS), etc. Finally, Hg0 oxidation catalytic activity was determined. Due to the increasing population of Au-O antibonding orbital interactions in the valence band, the bond order of O-Au-O in Au SAC Ti1-xO2 decreased significantly, thereby enhancing the oxidation ability of its adjacent oxygen atoms. Au SA and ultra-small Au clusters coexisted on a Ti1-xO2 catalyst, and the Hg0-oxidation efficiency at 150–200 °C was 14 times and 1.5 times greater than those of TiO2 and 0.1 % Au/TiO2, respectively. Furthermore, Au SAC Ti1-xO2 was more resistant to the inhibition of SO2 and NO. It provides an efficient method for developing highly active SA catalysts for Hg0 oxidation.
科研通智能强力驱动
Strongly Powered by AbleSci AI