Abstract
The design of efficient catalysts with desirable active sites is an important direction for the plasma catalytic oxidation of VOCs. In this research, a combination of hydrothermal and impregnation methods was used to load Pt nanoparticles on MnO2 with different crystalline phases. The effect of Pt/MnO2 catalysts with different interactions between Pt and MnO2 on the plasma catalytic oxidation of o-xylene under ambient conditions was investigated. The plasma catalytic performance of different Pt/MnO2 varied greatly due to the different physicochemical properties of MnO2 with different crystalline phases. Among them, Pt/α-MnO2 showed the best catalytic performance with 100% o-xylene conversion and 93% CO2 selectivity at room temperature and 100 J/L energy density. The characterization results showed that the most electron transfer from Mn to Pt at the Pt/α-MnO2 interface produced the most oxygen vacancies and afforded the highest oxygen migration ability. The construction of Pt-MnO2 interface with strong electron coupling effect led to the excellent plasma catalytic efficiency as well as stability towards VOCs oxidation. This work provides inspiration for the design of efficient catalyst for the plasma catalytic oxidation of aromatic VOCs.
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