HgCl2 sorption on lignite activated carbon: Analysis of fixed-bed results

Mibeck, Blaise A.F.; Olson, Edwin S.; Miller, Stanley J.

doi:10.1016/j.fuproc.2009.08.004

Cited by 17 publications

(9 citation statements)

References 8 publications

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“…These experimental results were in part consistent with those presented by Miller et al [12], in which HCl and NO markedly decreased Hg 0 breakthrough percentage for Norit FGD carbon. Mibeck et al [18] also demonstrated the positive effects of HCl and NO on the adsorption of HgCl 2 on lignite activated carbon. Furthermore, the importance of O 2 in Hg 0 adsorption has been presented by Liu et at.…”

Section: Physical and Chemical Properties Of Tested Activated Carbonmentioning

confidence: 96%

“…These impacts may be caused by both the alternation of adsorbent's surface and the Hg speciation due to interactions with the gas components, such as HCl, O 2 , SO x and NO x [5,[12][13][14][15][16][17][18][19]. It is generally shown that NO 2 and SO x , especially SO 3 , had negative effects on the adsorption of Hg 0 with activated carbon.…”

Section: Introductionmentioning

confidence: 99%

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Influences of acidic/oxidizing gases on elemental mercury adsorption equilibrium and kinetics of sulfur-impregnated activated carbon

Hsi

Chen

2012

Fuel

119

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Section: Physical and Chemical Properties Of Tested Activated Carbonmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Influences of acidic/oxidizing gases on elemental mercury adsorption equilibrium and kinetics of sulfur-impregnated activated carbon

Hsi

Chen

2012

Fuel

119

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“…On the other hand, adding 20 ppm NO 2 in the presence of SO 2 , even with HCl and/or NO, resulted in a rapid breakthrough accompanied by a complete oxidation of the mercury. An explanation for this finding came in a later study in which uptake of HgCl 2 and Hg 0 onto a fixed bed of lignite activated carbon was monitored under similar baseline and acid gas conditions at 135 • C (79). Combining SO 2 with NO 2 once again resulted in rapid breakthrough and saturation of the activated carbon.…”

Section: Uptake Of Mercury To Virgin Activated Carbonmentioning

confidence: 97%

“…Several of the studies described above were performed under conditions in which H 2 SO 4 could potentially form, and for some, this was hypothesized to be the reason behind observations of mercury uptake inhibition (28,29,79). On the other hand, it has been suggested by several researchers that the formation of H 2 SO 4 at the carbon surface was the cause of observed improvements in mercury uptake capacity (32,76).…”

Section: Understanding the Effect Of H 2 So 4 On Mercury Uptakementioning

confidence: 99%

Understanding the effects of sulfur on mercury capture from coal-fired utility flue gases

Morris

Morita

Jia

2010

Journal of Sulfur Chemistry

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Coal combustion continues to be a major source of energy throughout the world and is the leading contributor to anthropogenic mercury emissions. Effective control of these emissions requires a good understanding of how other flue gas constituents such as sulfur dioxide (SO 2 ) and sulfur trioxide (SO 3 ) may interfere in the removal process. Most of the current literature suggests that SO 2 hinders elemental mercury (Hg 0 ) oxidation by scavenging oxidizing species such as chlorine (Cl 2 ) and reduces the overall efficiency of mercury capture, while there is evidence to suggest that SO 2 with oxygen (O 2 ) enhances Hg 0 oxidation by promoting Cl 2 formation below 100 • C. However, studies in which SO 2 was shown to have a positive correlation with Hg 0 oxidation in full-scale utilities indicate that these interactions may be heavily dependent on operating conditions, particularly chlorine content of the coal and temperature. While bench-scale studies explicitly targeting SO 3 are scarce, the general consensus among full-scale coal-fired utilities is that its presence in flue gas has a strong negative correlation with mercury capture efficiency. The exact reason behind this observed correlation is not completely clear, however. While SO 3 is an inevitable product of SO 2 oxidation by O 2 , a reaction that hinders Hg 0 oxidation, it readily reacts with water vapor, forms sulfuric acid (H 2 SO 4 ) at the surface of carbon, and physically blocks active sites of carbon. On the other hand, H 2 SO 4 on carbon surfaces may increase mercury capacity either through the creation of oxidation sites on the carbon surface or through a direct reaction of mercury with the acid. However, neither of these beneficial impacts is expected to be of practical significance for an activated carbon injection system in a real coal-fired utility flue gas.

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“…Other researches focused on the removal of Hg(II) from water by sorption processes are provided [48][49][50] . However, the use of mixed mineral systems of clays and hydroxides as suitable sorbents in mercury removal is lacking in literature.…”

Section: Theoretical Models and Isothermsmentioning

confidence: 99%

Mercury Removal from Aqueous Solution by Mixed Mineral Systems II. The Role of Solution Composition and Ageing

Egirani¹

2013

IOSR-JESTFT

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HgCl2 sorption on lignite activated carbon: Analysis of fixed-bed results

Cited by 17 publications

References 8 publications

Influences of acidic/oxidizing gases on elemental mercury adsorption equilibrium and kinetics of sulfur-impregnated activated carbon

Influences of acidic/oxidizing gases on elemental mercury adsorption equilibrium and kinetics of sulfur-impregnated activated carbon

Understanding the effects of sulfur on mercury capture from coal-fired utility flue gases

Mercury Removal from Aqueous Solution by Mixed Mineral Systems II. The Role of Solution Composition and Ageing

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