Impact Factor:

8.943

DOI number:

10.1016/j.chemosphere.2021.132890

Affiliation of Author(s):

中国科学院大学

Journal:

Chemosphere

Funded by:

重庆市科技局，重庆工商大学

Key Words:

Oxygen vacancy；α-MnO2；Catalytic oxidation；DFT calculation；Toluene

Abstract:

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.

First Author:

Jia Zeng,Hongmei Xie

Co-author:

Hanyi Zhang,Min Huang,Xuecheng Liu

Indexed by:

源刊论文

Correspondence Author:

Guilin Zhou,Yi Jiang

Discipline:

Engineering

Document Type:

Journal Article

Volume:

291

Issue:

3

Page Number:

132890

Translation or Not:

no

Date of Publication:

2022-03-01

Included Journals:

SCI

Links to published journals:

https://doi.org/10.1016/j.chemosphere.2021.132890