Dielectric barrier discharge coupling catalytic oxidation for efficient conversion of Hg0 from flue gas

For efficient conversion of elemental mercury (Hg-0) in flue gas, we coupled the non-thermal plasma (NTP) and catalytic oxidation, and prepared MnCu/Ti catalytic through dielectric barrier discharge (DBD) reactor. The experimental system of DBD coupling MnCu/Ti catalytic oxidation was established. The catalytic oxidation performance and the influences of energy density (SED), oxygen content, H2O content, and the concentrations of NO and SO2 on the conversion efficiency of Hg-0 were clarified. Based on the experimental results and DFT simulation results, the mechanism of the catalytic oxidation was elucidated. Our results showed that after coupling with MnCu/Ti, the conversion efficiency of Hg-0 in DBD reactor under mild conditions increased from 42.9% to 86.7%, and the energy consumption decreased from 0.77 mg Hg-0/kWh to 1.56 mg Hg-0/kWh. The proposed method has the advantages of high efficiency, intensive and no secondary pollution, hence it has good application potential in Hg-0 conversion and removal from flue gas.

Automated summary

By coupling non-thermal plasma and catalytic oxidation with MnCu/Ti catalyst, the conversion efficiency of elemental mercury in flue gas can be significantly increased while reducing energy consumption and avoiding secondary pollution. This method has great potential for application in the conversion and removal of Hg-0 from flue gas.