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- W2201259708 abstract "Abstract Rice husk, a common agricultural waste and renewable biomass, was pyrolyzed and then impregnated with NH 4 Cl and NH 4 Br to develop an efficient sorbent for gaseous mercury removal from flue gas. The sorbents’ performance was first investigated in a fixed-bed system with N 2 atmosphere at 150 °C and then in an entrained-flow system with real coal-fired flue gas at 150 °C. For comparison, a commercial coal-based activated carbon (CAC) treated with the same impregnation method was also studied. In the N 2 atmosphere, the mercury removal performance of rice husk char (RHC) was significantly enhanced after modification with ammonium halides, which are neither strong oxidants nor strong catalysts. The comparison of the RHC modified with HBr, NH 4 Br, CaBr 2 , (NH 4 ) 2 SO 4 and NH 4 OH with the same amount of bromine or ammonia confirmed the pivotal role of halogen in mercury removal. Although ammonia was proven to have no beneficial impact, the mercury removal capacity varied as the cation changed and increased as the pH of the halide impregnation solutions decreased. When tested in real coal-fired flue gas with a high concentration of SO 2 (1177 ppmv) and NO (254 ppmv), the ammonium bromide impregnated RHC sorbent which had an excellent mercury removal performance in the fixed-bed still reached about 80% efficiency for gaseous mercury removal. Furthermore, a synergistic effect on SO 2 /NO removal was observed for both ammonium halides modified RHC and CAC sorbents injected into the real coal-fired flue gas; the synergistic effect might be due to the oxidation effect of O 2 and H 2 O in the flue gas and the catalytic effect of the carbonaceous sorbent. Most micropore structure of the RHC was maintained after ammonium halides impregnation; however, the physisorption energy decreased in various degrees. Overall, in spite that the BET surface area and micropore volume of the RHC sorbent were smaller than the CAC, the RHC sorbent still reached a comparable level of multipollutants capture." @default.
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- W2201259708 date "2016-05-01" @default.
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- W2201259708 title "Mercury removal and synergistic capture of SO2/NO by ammonium halides modified rice husk char" @default.
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- W2201259708 doi "https://doi.org/10.1016/j.fuel.2015.12.061" @default.
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