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Nano Research

Article Title

Formation of active oxygen species on single-atom Pt catalyst and promoted catalytic oxidation of toluene

Authors

Shunzheng Zhao, Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China
Yanfeng Wen, Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Xijun Liu, Center for Electron Microscopy and Tianjin Key Lab of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
Xianyun Pen, Center for Electron Microscopy and Tianjin Key Lab of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
Fang Lü, Center for Electron Microscopy and Tianjin Key Lab of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
Fengyu Gao, Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Xizhou Xie, Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Chengcheng Du, Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Honghong Yi, Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China
Dongjuan Kang, Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Xiaolong Tang, Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China

Keywords

single-atom Pt, activation of molecular oxygen, oxygen vacancies, active oxygen species, oxidation of toluene

Abstract

Catalytic oxidation of toluene over noble metal catalysts is a representative reaction for elimination of volatile organic compounds (VOCs). However, to fully understand the activation of molecular oxygen and the role of active oxygen species generated in this reaction is still a challenging target. Herein, MgO nanosheets and single-atom Pt loaded MgO (Pt SA/MgO) nanosheets were synthesized and used as catalysts in toluene oxidation. The activation process of molecular oxygen and oxidation performance on the two catalysts were contrastively investigated. The Pt SA/MgO exhibited significantly enhanced catalytic activity compared to MgO. The oxygen vacancies can be easily generated on the Pt SA/MgO surface, which facilitate the activation of molecular oxygen and the formation of active oxygen species. Based on the experimental data and theoretical calculations, an active oxygen species promoted oxidation mechanism for toluene was proposed. In the presence of H2O, the molecular oxygen is more favorable to be dissociated to generate •OH on the oxygen vacancies of the Pt SA/MgO surface, which is the dominant active oxygen species. We anticipate that this work may shed light on further investigation of the oxidation mechanism of toluene and other VOCs over noble metal catalysts.

Graphical Abstract

Publisher

Tsinghua University Press

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