| Autor: |
Liu, Hao, Chen, Jianjun, Wang, Ya, Yin, Rongqiang, Yang, Wenhao, Wang, Guimin, Si, Wenzhe, Peng, Yue, Li, Junhua |
| Zdroj: |
Environmental Science & Technology; April 2022, Vol. 56 Issue: 7 p4467-4476, 10p |
| Abstrakt: |
Simultaneous catalytic elimination of nitrogen oxides (NOx, x= 1 and 2) and volatile organic compounds (VOCs) is of great importance for environmental preservation in China. In this work, the interactions of simultaneous removal of NOxand methylbenzene (PhCH3) were investigated on a CeO2–TiO2mixed oxide catalyst, which demonstrated excellent bifunctional removal efficiencies for the two pollutants. The results indicated that NOxpositively promotes PhCH3oxidation, while NH3negatively inhibits through competitive adsorption with PhCH3. The underlying mechanism is that a pseudo PhCH3-SCR reaction happened in this process is parallel to NH3-SCR. Combined with in situdiffuse reflectance infrared Fourier transform spectroscopy and quasi in situX-ray photoelectron spectroscopy, the interaction mechanism between NOxand PhCH3is proposed. Specifically, NOxis adsorbed on the catalyst surface to produce nitrate species, which reacts with the carboxylate generated during PhCH3oxidation to form organic nitrogen intermediates that create N2and CO2in the following reactions. In the reaction process, the superoxide (O2–) generated by O2activation on the catalyst surface is an important species for the propelling of oxidation reaction. This work could provide guidelines for the design of state-of-the-art catalysts for simultaneous catalytic removal of NOxand VOCs. |
| Databáze: |
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