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The effect of physicochemical properties on the mercury adsorption performance of three fly ash samples has been investigated. The samples were tested for mercury adsorption using a fixed-bed with a simulated gas. X-ray fluorescence spectroscopy, X-ray photoelectron spectroscopy and other methods were used to characterize the samples. The results indicate that mercury adsorption on fly ash is mainly physisorption and chemisorption. Uncompleted burned carbon is an important factor for the improvement of mercury removal efficiency, especially, the C-M bond may improve the oxidation of mercury, which formed via the reaction of C and Ti, Si and other elements. The higher specific surface areas and smaller pore diameter are all beneficial for the high mercury removal efficiency. The presence of O2 plays a positive role on Hg adsorption of modified fly ash, while SO2 has double role of inhibition because of competitive adsorption and promotion to chemisorption. In addition, sample modified with FeCl3 has a great performance in Hg removal.
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Wu Y, Wang SX, Streets DG, Hao JM, Chan M, Jiang JK. Trends in anthropogenic mercury emissions in China from 1995-2003. Environ Sci Technol. 2006;40(17):5312–8. CrossRef
Pavlish JH, Sondreal EA, Mann MD, Olson ES, Galbreath KC, Benson SA. State review of mercury control options for coal-fired power plants. Fuel Process Technol. 2003;82(2–3):89–165. CrossRef
Wang LG, Chen CH. Element mercury adsorption by residual carbon separated from fly ash. J University Sci Technol Beijing. 2004;26(4):353–6.
Wang LG, Chen CH. Impacts of unburned carbon fractal characteristic to its mercury sorption reaction. Environ Chem. 2005;24(1):59–62.
Chen XH. Impacts of fly ash, its composition, and flue gas components on mercury speciation in simulated flue gas. Kuming University: Kuming; 2007.
Hassett DJ, Eylands KE. Mercury capture on coal combustion fly ash. Fuel. 1999;78(2):243–8. CrossRef
Li M, Liu J, Zhen C-G. Studies on mercury adsorption mechanism on unburned carbon surface. J Eng Thermophys. 2007;28(9):882–4.
Maroto-Valer MM, Zhang YZ, Granite EJ, Pennline HW. Effect of porous structure and surface functionality on the mercury capacity of a fly ash carbon and its activated sample. Fuel. 2005;84(1):105–8. CrossRef
Lopez-Anton MA, Abad-Valle P, Diaz-Somoano M, Suarez-Ruiz I, Martineez-Tarazona MR. The influence of carbon particle type in fly ashes on mercury adsorption. Fuel. 2009;88(7):1194–200. CrossRef
Zhao YC, Zhang JY, Liu J, Diaz-Somoano M, Abad-Valle P, Martinez-Tarazona MR, Zheng CG. Experimental study on fly ash capture mercury in flue gas. Sci China Technol Sci. 2010;53(4):976–83. CrossRef
Gregg SJ. Adsorption surface area and porosity. Beijing: Chemical Industry Press; 1989.
Uhlmann K, Harting M, Britton DT. Characterization of titanium nitride layers by positron- annihilation and X-ray diffraction. J Phys Condens Matter. 1994;6(15):2943–8. CrossRef
Seal S, Barr TL, Sobczak N, Kerber SJ. Microscopy and electron spectroscopic study of interfacial chemistry in Al–Ti alloy/graphite systems. J Mater Sci. 1998;33(16):4147–58. CrossRef
Selamat MS, Watson LM, Baker TN. XRD and XPS studies on surface MMC layer of SiC reinforced Ti-6Al-4V alloy. J Mater Process Technol. 2003;142(3):725–37. CrossRef
Aegerter PA, Quigley WWC, Simpson GJ, Zieglar DD, Logan JW, Maarea KR, Glazier S, Bussell ME. Thiophene hydrodesulfurization over alumina-supported molybdenum carbide and nitride catalysts: adsorption sites, catalytic activities, and nature of the active surface. J Catal. 1996;164(1):109–21. CrossRef
Ramanathan S, Oyama ST. New catalysts for hydroprocessing: transition metal carbides and nitrides. J Phys Chem. 1995;99(44):16365–72. CrossRef
Stohr B, Boehm HP, Schlog IR. Enhancement of the catalytic activity of activated carbons reaction by thermal treatment with ammonia or hydrogen cyanide and observation of a superoxide species as possible intermediate. Carbon. 1991;29(6):707–20. CrossRef
Zhang SY, Xiang YH, Zhao JT, Chen FY, Huang JJ, Wang Y. Study on the mechanism of flue gas desulfurization by carbonaceous materials. Coal Convers. 2002;25(2):29–34.
- Mercury Removal from Coal Combustion Flue Gas by Fly Ash
- Springer Berlin Heidelberg