催化作用
原位
氧气
吸附
材料科学
丙烷
活动站点
化学工程
光化学
化学
无机化学
物理化学
工程类
有机化学
作者
Wei Chen,Jianlong Zheng,Yarong Fang,Yutao Wang,Jinpeng Hu,Yuhua Zhu,Xinhua Zhu,Weihao Li,Qian Zhang,Chuanqi Pan,Baojian Zhang,Xiaoqing Qiu,Sibo Wang,Shuang Cui,Jinlong Wang,Jinsong Wu,Zhu Luo,Yanbing Guo
标识
DOI:10.1021/acs.est.3c08380
摘要
Typically, SO2 unavoidably deactivates catalysts in most heterogeneous catalytic oxidations. However, for Pt-based catalysts, SO2 exhibits an extraordinary boosting effect in propane catalytic oxidation, but the promotive mechanism remains contentious. In this study, an in situ-formed tactful (Pt–S–O)-Ti structure was concluded to be a key factor for Pt/TiO2 catalysts with a substantial SO2 tolerance ability. The experiments and theoretical calculations confirm that the high degree of hybridization and orbital coupling between Pt 5d and S 3p orbitals enable more charge transfer from Pt to S species, thus forming the (Pt–S–O)-Ti structure with the oxygen atom dissociated from the chemisorbed O2 adsorbed on oxygen vacancies. The active oxygen atom in the (Pt–S–O)-Ti active structure is a robust site for C3H8 adsorption, leading to a better C3H8 combustion performance. This work can provide insights into the rational design of chemical bonds for high SO2 tolerance catalysts, thereby improving economic and environmental benefits.
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