Insight into the effects of oxygen vacancy on the toluene oxidation over α-MnO2 catalyst
发布时间：2024-11-29
点击次数：
- 影响因子：
- 8.943
- DOI码：
- 10.1016/j.chemosphere.2021.132890
- 所属单位：
- 中国科学院大学
- 发表刊物：
- Chemosphere
- 项目来源：
- 重庆市科技局，重庆工商大学
- 关键字：
- Oxygen vacancy；α-MnO2；Catalytic oxidation；DFT calculation；Toluene
- 摘要：
- In order to clarify the role of oxygen vacancy (OV), five α-MnO2 catalysts with abundant OVs are fabricated via a novel and facile redox-precipitation approach and employed to the toluene oxidation in air. The concentration of OVs in α-MnO2 catalysts is regulated via the alkyl chain length of alcohols, and its correlation with catalytic performances is scientifically investigated based on various characterization technologies and density functional theory (DFT) calculation. The α-MnO2-C2 catalyst exhibits excellent catalytic activity (T90 = 217 °C), stability, and water resistance for toluene oxidation in air. The OVs can induce the new bandgap states (BGS), which upshift the antibonding orbitals relative to the Fermi level (Ef), eventually favoring the formation of adsorbed active oxygen species. Furthermore, the OVs cause an increase in the amount of Mn3+, resulting in the elongated Mn–O bonds due to the strong Jahn-Teller effect of Mn3+. Therefore, the synergistic effects of OVs benefit toluene oxidation through L-H and MvK mechanisms over the prepared α-MnO2-Cx catalysts. This work reveals the important role of OVs in the promotion of toluene catalytic oxidation activity and also may provide new insights for the design of high-performance VOCs oxidation elimination catalyst.
- 第一作者：
- Jia Zeng,Hongmei Xie
- 合写作者：
- Hanyi Zhang,Min Huang,Xuecheng Liu
- 论文类型：
- 源刊论文
- 通讯作者：
- Guilin Zhou,Yi Jiang
- 学科门类：
- 工学
- 文献类型：
- Journal Article
- 卷号：
- 291
- 期号：
- 3
- 页面范围：
- 132890
- 是否译文：
- 否
- 发表时间：
- 2022-03-01
- 收录刊物：
- SCI