Tributyl phosphate (cas 126-73-8) additive enhancing catalytic absorption of NO2 for simultaneous removal of SO2/NOx in wet desulfurization system

Add time:09/09/2019    Source:sciencedirect.com

Removal of SO2 and NO emissions from coal-fired power plants have always been the focus in coal's utilization industries for which traditional wet desulfurization system hold the potential to achieve simultaneous removal of SO2/NOx. In this work, a novel liquid catalyst (Tributyl phosphate (cas 126-73-8), TBP) was investigated for the simultaneous removal of SO2 and NOx in a NO pre-oxidation (ozone oxidation) assisted process. The absorption process and reaction mechanism of SO2 and NO2 were studied in a small-scale experimental system, and the removal efficiency of pollutant and the key parameters were examined in a pilot-scale system. The results show that the removal efficiency of NO2 in traditional wet desulfurization system is only 20–40%; however greatly increases to >90% when TBP is added. Moreover, TBP can enhance the NO2 removal performance in the presence of SO2 due to the formation of TBP–NO2–SO32− complex. Considering the oily nature of TBP that can be easily separated, such addition strategy hold great potential for industrial SO2/NOx simultaneously removal.

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