Development of iron-based sorbents for Hg0 removal from coal derived fuel gas: Effect of hydrogen chloride

Mechanisms and roles of fly ash compositions on the adsorption and oxidation of mercury in flue gas from coal combustion

“…The normalized mercury concentration increased from 0.2 to 0.3 to more than 0.9 in the N 2 atmosphere for approximately 1 h. The adsorption capacity displayed minimal increases in the N 2 + O 2 and simulated flue gas. Iron-base sorbents have been developed to remove elemental mercury from coal combustion flue gas [44][45][46]. But according to this study, Al-based sorbents may be more efficient than that of iron-based sorbents.…”

Simultaneous removal of SO2, NO and Hg0 by wet scrubbing using urea + KMnO4 solution

“…It is estimated that N 2 is generated during the reaction; the reactions of Eqs. (8)- (16) can be used to explain these phenomena.…”

“…If high removal efficiencies of mercury and NO are also achieved, wet FGD systems can be used for cost-effective multi-pollutant control. However, NO which accounts for more than 90% of NO X in typical flue gas is quite insoluble in water, and Hg 0 is difficult to capture due to its volatility and insoluble and chemical stability [16]. It is known that NO and Hg 0 are insoluble in water and difficult to remove; in contrast NO 2 and Hg 2+ can be efficiently removed by WFGD.…”

Hg2+ reduction and re-emission from simulated wet flue gas desulfurization liquors

“…There are three forms of mercury which may be present in the coal combustion flue gas: elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ), and particle-bound mercury (Hg P ) [9]. Generally, oxidized mercury is water-soluble and can be efficiently removed in the wet flue gas desulfurization (FGD) processes of coal combustion, which exhibits up to 90% removal of Hg 2+ .…”

“…10% of the total, most can be captured by the typical air pollution control devices (APCD) such as electrostatic precipitators and baghouses. However, the elemental mercury is difficult to capture with typical APCD due to its volatility and chemical stability [3,4,9]. Mercury in atmosphere is mostly in the form of elemental mercury vapor, it can circulate in the atmosphere for 1-2 y, allowing its wide dispersion and long-distance transportation [10].…”