Insights into the reaction pathways and mechanism of NO removal by SDBD plasma via FT-IR measurements
2019
Chen, Si | Wang, Ting | Wang, Haiqiang | Wu, Zhongbiao
Reaction pathways and specific mechanism of NO removal by non-thermal plasma (NTP) were for the first time investigated via FT-IR measurements. It was found that NO removal was attributed to a co-effect of N and O radicals but centered on the latter, and only O radical worked for NO oxidizing to NO2, since O3 can't be obtained under the lock of fast NOx reaction. O2 content regulated reaction behaviors that reduction pathways was dominating when O2 content was <4% while oxidation pathways under 4–21%. NO was mainly oxidized to NO2 when in O2 content of 4% to 10%, thanks to fast NOx reaction. While under other O2 content, fast NOx reaction was broken and NO would be further oxidized to N2O5 and HNO3 totally, followed by the generation of O3 from background. NO and NO2 would be obtained again from background reactions when high O2 content under high SIE, along with disappearance of O3. Furthermore, the electrode temperature (>30 °C) and the addition of flue gas components like H2O, CO and CO2 showed negative effects on NO removal, while HCl were on the contrary. SO2 revealed nearly no influence.
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