Role of the In-Situ-Formed Surface (Pt-S-O)-Ti Active Structure in SO2-Promoted C3H8 Combustion over a Pt/TiO2 Catalyst

作者：Chen, Wei; Zheng, Juan; Fang, Yarong; Wang, Yutao; Hu, Jinpeng; Zhu, Yuhua; Zhu, Xiaoxiao; Li, Weihao; Zhang, Qian; Pan, Chuanqi; Zhang, Baojian; Qiu, Xiaofeng; Wang, Sibo; Cui, Shuang; Wang, Jinlong; Wu, Jinsong; Luo, Zhu^*; Guo, Yanbing^*

来源：Environmental Science and Technology, 2024, 58(6): 3041-3053.

DOI：10.1021/acs.est.3c08380

• C3H8 catalytic oxidation
• Pt-basedcatalysts
• SO2 promotion
• (Pt-S-O)-Tiactive structure
• C-H bond activation

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 O-2 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.

• 单位
  武汉理工大学