| Autor: |
Huang, Jing, Fang, Ruimei, Huang, Xinyue, Luo, Xiao'ai, Sun, Yanjuan, Dong, Fan, Huang, Haibao |
| Zdroj: |
Chemical Physics Impact; December 2022, Vol. 5 Issue: 1 |
| Abstrakt: |
Engineering oxygen vacancies is an effective strategy to enhance the catalytic activity of MnO2based composite oxides in heterogenous reactions, such as volatile organic compounds (VOCs) oxidation reaction. Core-shell structure LaMnO3@α-MnO2catalysts were prepared by hydrothermal method via varying the concentrations of LaMnO3and used in toluene oxidation reaction. Irregular core-shell structure L@M-10 catalyst exhibits excellent low temperature catalytic activity and stability, achieving 100% toluene removal efficiency at 200 °C. The light-off temperature (T50) and complete conversion temperature (T90) are 235 and 271 °C even after five repetitive cycles, respectively. The interfacial effect of L@M-10 sample promotes the generation of oxygen vacancies, facilitating the formation of active oxygen species. A possible oxidation reaction mechanism of toluene over L@M-10 catalyst was proposed in combination with the in-situDRIFTS results. Fast ring-opening reaction and quick transformation of carboxylate or anhydride species into final products CO2and H2O explains the superior catalytic property and stability of L@M-10 sample. This work highlights the effect of interface on the catalytic activity and stability of LaMnO3@α-MnO2catalyst towards toluene oxidation and can offer a new insight into the utilization of interfacial effect in thermocatalytic reactions. |
| Databáze: |
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