Development and evaluation of magnetic iron-carbon sorbents for mercury removal in coal combustion flue gas |
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| Affiliation: | 1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;2. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;3. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada |
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| Abstract: | In order to get a cost effective and recyclable sorbent for mercury removal, a series of magnetic iron-carbon (Fe–C-x) sorbents was developed by co-precipitation. The physical and chemical properties of obtained sorbents were evaluated through various characterization methods. According to the results, Fe3O4 precipitate on carbon weakens the surface properties, but mercury removal performance in simulated flue gas is excellent. For flue gas components, HCl promotes mercury oxidation and adsorption on sorbents, O2 has limited effect on mercury removal and SO2 plays an inhibitive role. NO could enhance mercury oxidation with O2 existence because of the generation of NO2, which could react with Hg0 through heterogeneous reaction over iron-carbon surface. Besides, effects of temperature and regeneration performance were further researched under simulated flue gas. Apart from higher temperature will decompose mercury compounds and cause the removal efficiency decrease, Fe–C-3 sorbent shows excellent Hg0 removal performance at the temperature window of 100–200 °C. Exceptional regeneration performance on Hg0 removal indicates that spent sorbent could be regenerated. |
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| Keywords: | Mercury removal Iron-carbon sorbent Magnetic separation Flue gas Recycling |
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