Influence of a CO2-enriched flue gas on mercury capture by activated carbons

López-Antón, M. Antonia; Rumayor, Marta; Dı́az-Somoano, Mercedes; Martı́nez-Tarazona, M. Rosa

doi:10.1016/j.cej.2014.10.088

Cited by 48 publications

(33 citation statements)

References 34 publications

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“…It can be seen that CO 2 promote the chemical adsorption and heterogeneous oxidation of Hg 0 , about 14% of Hg 0 is transformed into heterogeneous Hg 2+ after passing through the sorbent bed. Lopez-Anton et al 39 showed that the oxidation and adsorption effect of activated carbon on Hg 0 in oxy-fuel atmosphere was significantly higher than that in N 2 atmosphere, which was consistent with the results of this study. Wang et al 40 showed that CO 2 can form C═O and C─O─C structures, which can promote the adsorption and oxidation of Hg 0 .…”

Section: Effect Of Cosupporting

confidence: 93%

Effect of flue gas components on Hg⁰ oxidation and adsorption by modified walnut shell coke in O₂/CO₂ atmosphere

Zhang

Duan

Wang

et al. 2020

Asia-Pacific J Chem Eng

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Walnut shell was pyrolyzed and then impregnated with NH4Br to make sorbent for Hg0 removal. The effect of flue gas components on Hg0 removal performance was studied in O2/CO2 atmosphere, and the results were compared with those in O2/N2 atmosphere. The mercury valence distribution during adsorption was obtained. NH4Br‐modified walnut shell coke promoted Hg0 removal, the Br‐containing chemisorption site was a crucial factor. Although addition of CO2 did not introduce new oxygen‐containing functional groups or change the mercury species, Hg0 removal efficiency increased significantly. This may be because CO2 can increase the active sites on the carbon surface. In O2/N2 atmosphere, O2 promoted formation of active center on the sorbent surface, which made Hg0 more easily adsorbed and then reacted with Br‐functional group to form more HgBr2. In O2/CO2 atmosphere, O2 promoted formation of some reactive carbon–oxygen complexes which acted as catalyst to facilitate Hg0 oxidation and formation of HgO. NO improved removal of Hg0, because the C─O functional group on the sorbent surface could catalyze the conversion of NO to NO2 in the adsorbed state and then formed Hg2(NO3)2. SO2 consumed oxygen on the sorbent surface and inhibited the Hg0 removal.

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Section: Effect Of Cosupporting

confidence: 93%

Effect of flue gas components on Hg⁰ oxidation and adsorption by modified walnut shell coke in O₂/CO₂ atmosphere

Zhang

Duan

Wang

et al. 2020

Asia-Pacific J Chem Eng

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“…Previous works have suggested that oxygen functional groups, particularly lactones and carbonyls, may favour mercury adsorption whereas phenol groups would inhibit its adsorption [38,[40][41][42]. From the release of CO, carbonyls and quinones (peaks centered at 850ºC) were only identified in AC-1, whereas the peaks centered at temperatures between 600 and 800ºC, corresponding to the decomposition of phenols and ethers, were identified in AC-2 and AC-3 (Figure 4 (B)).…”

Section: Effect Of Mercury In the Co 2 Adsorption Capacitymentioning

confidence: 87%

Effect of Hg on CO2 capture by solid sorbents in the presence of acid gases

Fernández-Miranda

García

López-Antón

et al. 2017

Chemical Engineering Journal

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“…It must be taken into account that at higher temperatures (in presence of oxygen) SO2 is partly oxidized to SO3, and in the case of presence of water vapours, they could result in H2SO4 that may be adsorbed on the surface of the sorbents. This effect together with adsorption effects of CO2 inhibit mercury adsorption, as there could be a competition for the same surface binding sites (López-Antón et al, 2015). On the other hand, depending on sorbent nature, the adsorbed SO3/H2SO4 can contribute to better sorption of mercury in the form of sulphates.…”

Section: Mercury Removal Experimentsmentioning

confidence: 99%

Mercury removal from MSW incineration flue gas by mineral-based sorbents

et al. 2018

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Three samples of commercially available mineral-based sorbents (zeolite, bentonite and diatomaceous earth) were selected and evaluated for Hg capture under conditions of simulated dry flue gas atmosphere typical in Municipal Solid Waste Incineration (MSWI). The experiments were carried out in a lab-scale fixed-bed device at temperatures between 120 and 200 °C. Two samples of activated carbons (AC) (raw-AC and sulphur impregnated AC) were tested under the same conditions. The mineral-based sorbents were chemically promoted by sulphur, FeCl and CaBr, achieving an improvement in the overall reduction percentage of Hgout (g) up to 85%, which was comparable to that obtained using a commercial activated carbon for Hg capture (sulphur impregnated AC). The study demonstrates that sorbents with a matrix relatively richer in TiO, FeO and AlO, as bentonite, favour Hg heterogeneous oxidation. The best Hg capture capacity was achieved with a zeolite sorbent sample characterized by high specific surface (132 m/g) and impregnated with elemental sulphur. The final form of mercury retained in this sorbent was HgS with proved long-term stability in disposal and landfilling. The higher the temperature, the lower the efficiency of Hg capture being the optimum temperature for Hg-capture in the range of 120-150 °C. This study provides a basis for the development of new efficient non-carbon sorbents for mercury removal in the air pollution control lines of MSWI facilities considering the non-hazardous final form of mercury and its long-term landfilling/sequestration.

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Influence of a CO2-enriched flue gas on mercury capture by activated carbons

Cited by 48 publications

References 34 publications

Effect of flue gas components on Hg⁰ oxidation and adsorption by modified walnut shell coke in O₂/CO₂ atmosphere

Effect of flue gas components on Hg⁰ oxidation and adsorption by modified walnut shell coke in O₂/CO₂ atmosphere

Effect of Hg on CO2 capture by solid sorbents in the presence of acid gases

Mercury removal from MSW incineration flue gas by mineral-based sorbents

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Influence of a CO2-enriched flue gas on mercury capture by activated carbons

Cited by 48 publications

References 34 publications

Effect of flue gas components on Hg0 oxidation and adsorption by modified walnut shell coke in O2/CO2 atmosphere

Effect of flue gas components on Hg0 oxidation and adsorption by modified walnut shell coke in O2/CO2 atmosphere

Effect of Hg on CO2 capture by solid sorbents in the presence of acid gases

Mercury removal from MSW incineration flue gas by mineral-based sorbents

Contact Info

Product

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Effect of flue gas components on Hg⁰ oxidation and adsorption by modified walnut shell coke in O₂/CO₂ atmosphere

Effect of flue gas components on Hg⁰ oxidation and adsorption by modified walnut shell coke in O₂/CO₂ atmosphere