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Oxidation of Elemental Mercury by Active Species Generated From a Surface Dielectric Barrier Discharge Plasma Reactor |
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| Authors: | Jiu Tao An Ke Feng Shang Na Lu Yu Ze Jiang Tie Cheng Wang Jie Li Yan Wu |
| Affiliation: | 1. Institute of Electrostatics and Special Power, Dalian University of Technology, Dalian, 116024, People’s Republic of China 2. Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education of the People’s Republic of China, Dalian, 116024, People’s Republic of China 3. Shandong Electric Power Research Institute, Jinan, 250002, People’s Republic of China |
| Abstract: | A surface dielectric barrier discharge plasma reactor was employed to study Hg0 oxidation in coal-fired flue gas. The experimental results showed that 98 % of Hg0 oxidation efficiency and 13.7 μg kJ?1 of energy yield were obtained under a specific energy density (SED) of 7.9 J L?1. Increasing SED was beneficial for Hg0 oxidation due to higher production of active species. Higher initial concentration resulted in lower Hg0 oxidation efficiency, but higher amount of Hg0 oxidation. Water vapor inhibited Hg0 oxidation because the generation of O3 was suppressed. The presence of NO remarkably restrained Hg0 oxidation, while SO2 showed little effect on Hg0 oxidation. Roles of active species in Hg0 oxidation were examined under different gas atmospheres (O2 and air), indicating that O3 played an important role in Hg0 oxidation. Deposits on the internal surface of the reactor were analyzed by energy dispersive spectroscopy and the product was identified as HgO. |
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