期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 460, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2023.132499
关键词
Oxygen vacancy; Molecular oxygen activation; Adsorption configuration; Propane combustion; a-MnO2
This study investigates the influence of oxygen vacancy concentration on the molecular oxygen activation behavior of a-MnO2 catalysts. It is found that increasing the concentration of oxygen vacancies can lead to a reconfiguration of the oxygen activation configuration, making oxygen molecules more suitable for adsorbing organic compounds and activating bonds. These findings are important for the development of efficient catalysts.
Oxygen vacancies (O-V), as the sites of molecular oxygen adsorption and activation, play an important role in the catalytic combustion process of volatile organic compounds (VOCs). Revealing the relationship between O-V concentration and molecular oxygen activation behavior is of significance to construct the efficient catalysts. Herein, a-MnO2 with different O-V concentrations was prepared to investigate the molecular oxygen activation for C3H8 combustion. It is disclosed that the enhanced O-V concentration in a-MnO2 induced the reconfiguration of surface metal atoms, resulting in the transformation of oxygen activation configuration from end-on mode to side-on mode. Oxygen molecules in side-on mode possessed more localized electron density and weaker coordination bond strength with surrounding Mn atoms, which were more favorable to adsorb C3H8 molecules and activate C-H bond for the improved combustion performance. This work provides a new understanding to reveal that the increased O-V concentration contributes to more efficient VOCs combustion.
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