Mercury adsorption and oxidation in coal combustion and gasification processes

Wilcox, Jennifer; Rupp, Erik C.; Ying, Samantha C.; Lim, Dong‐Hee; Negreira, Ana Suarez; Kirchofer, Abby; Feng, Feng; Lee, Kyoungjin

doi:10.1016/j.coal.2011.12.003

Cited by 262 publications

(194 citation statements)

References 165 publications

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“…21,22 Metal and metal oxide nanoparticles were among the most intensively studied Hg 0 adsorbents in previous studies. [23][24][25] In particular, noble metal nanoparticles, such as silver and gold, are the most intriguing ones, 20,24,26,27 which can efficiently capture mercury vapour by forming Ag-Hg or Au-Hg amalgam at temperatures close to ue gas conditions and can be regenerated by release of captured mercury through thermal treatment, providing a feasible way to regenerate mercury adsorbents. Meanwhile, surface functional groups (e.g.…”

Section: 10-12mentioning

confidence: 99%

Nanocomposites of graphene oxide, Ag nanoparticles, and magnetic ferrite nanoparticles for elemental mercury (Hg⁰) removal

et al. 2015

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=3ad27da5-41b3-490a-9f79-95c9fb750232 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=3ad27da5-41b3-490a-9f79-95c9fb750232 Mercury emission from combustion flue gas causes considerable environmental challenges and serious adverse health threats, and elemental mercury (Hg 0 ) is the most challenging chemical form for removal.In this work, four types of graphene oxide (GO) based composite adsorbents were successfully synthesized by depositing Ag nanoparticles (NPs) and/or magnetic ferrite NPs on GO sheets (denoted as GO, GO-Ag, MGO and MGO-Ag), characterized and applied for the removal of Hg 0 for the first time.The presence of Ag NPs on GO greatly enhances the Hg 0 removal capability of GO-Ag and MGO-Ag as compared to that of pure GO, which is mainly attributed to the amalgamation of Hg 0 on Ag NPs. MGOAg shows the best Hg 0 removal performance and thermal tolerance among the four types of adsorbents developed, which can effectively capture Hg 0 up to 150-200 C in a simulated flue gas environment and can be also effectively recycled and reused. Our results indicate that the graphene oxide based composites (i.e. MGO-Ag) have significant potential applications for mercury emission control in coalfired power plants.

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Section: 10-12mentioning

confidence: 99%

Nanocomposites of graphene oxide, Ag nanoparticles, and magnetic ferrite nanoparticles for elemental mercury (Hg⁰) removal

et al. 2015

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“…Coal-fired power plants were reported as the largest single source in most countries in Hg emissions (Pacyna et al, 2010). Hg is present in the coal-combustion flue gases in three major forms, namely, particle-bound (Hg p ), oxidized (Hg 2+ ), and elemental (Hg 0 ) forms (Hsi et al, 2010;Wilcox et al, 2012). Hg p and Hg 2+ can be readily captured by traditional air pollution control devices, such as electrostatic precipitators and wet flue gas desulfurization.…”

Section: Introductionmentioning

confidence: 99%

Influences of Copper(II) Chloride Impregnation on Activated Carbon for Low-Concentration Elemental Mercury Adsorption from Simulated Coal Combustion Flue Gas

Tsai

Chiu

Chuang

et al. 2017

Aerosol Air Qual. Res.

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In this study, the Hg 0 adsorption equilibrium and kinetics of a coconut-shell-based activated carbon impregnated with CuCl 2 were examined with respect to their resulting physical and chemical properties. Integrating the results from N 2 adsorption isotherm at 77 K, scanning electron microscopy, elemental analysis, X-ray photoelectron spectroscopy, and Hg 0 adsorption experiments under N 2 and simulated coal-combustion flue gases conditions, it was found that HCl pretreatment could enhance Hg 0 adsorption of crude activated carbon; the Hg 0 adsorption capacities of crude and HCl-pretreated activated carbon under N 2 condition were 95.8 and 225.4 µg g -1 , respectively. Additionally, CuCl 2 impregnation further increased the adsorption capacity of crude. The Hg 0 adsorption capacity of crude activated carbon with 8% CuCl 2 impregnation was 631.1 µg g -1 . However, the equilibrium Hg 0 adsorption capacity decreased when Cu loading exceeded 8 wt%, suggesting that adequate forms of surface Cu, O and Cl interacting with flue gas components and Hg 0 , as well as the presence of pores with specific size ranges allowing rapid transport of the Hg molecules into the interior of the activated carbon and as energy sinker govern the overall chemisorption process. Pseudo-second-order kinetic model could best describe the adsorption behaviors of tested samples under both test conditions, indicating that Hg 0 adsorbed on the activated carbon surface could be explained by bimolecular reaction mechanisms.

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“…Coal combustion has been proven the largest anthropogenic sources of atmospheric mercury emissions (Galbreath and Zygarlicke 2000;Pacyna et al 2006Pacyna et al , 2010Wilcox et al 2012;Huang et al 2016). The annual anthropogenic emission of mercury is estimated at nearly 31% of its total emissions (Pirrone et al 2010) while coal burning for mercury emission is 475 tons in 2010 (UNEP Chemicals Branch 2013).…”

Section: Introductionmentioning

confidence: 99%

The distribution and occurrence of mercury in Chinese coals

Bai

Wang

et al. 2017

Int J Coal Sci Technol

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Mercury is one of the most concerned hazardous elements in coals. 1018 coal samples of different coal-forming periods, coal-accumulating areas and coal ranks all over the country were collected to study the distributions of mercury in Chinese coals. The modes of occurrence of mercury were studied with float-sink experiments of 10 coals from different basins in China and correlation analyses were conducted between concentrations of mercury and maceral and sulfur contents, as well as the ash yield. The theoretic concentrations and affinities of mercury in vitrinite, inertinite, clay and pyrite were then calculated following the methods proposed by Solari. The weighted average concentration of mercury in Chinese coals is 0.154 lg/g, which is similar to that in the word coals in general. The mercury concentrations vary largely in the coals of different coal-forming period and coal-accumulating areas as geological settings play key roles in determining the geochemistry of mercury. The concentrations of mercury in coals from south and southwest China and those from North China of C 3 -P 1 are relatively higher while those from North China of J 1-2 and Northeast of J 3 -K 1 relatively lower. The general distribution trends of mercury are very similar to that of ash yield, sulfur contents in coals. Pyrite is the dominant carrier of mercury in most coals, especially in some high-sulfur coals with abundant epigenetic pyrite formed during diagenesis and metamorphism. Mercury has higher affinity to vitrinite than to inertinite in most coals, which accords with the geological origin of macerals and geochemistry of mercury.

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Mercury adsorption and oxidation in coal combustion and gasification processes

Cited by 262 publications

References 165 publications

Nanocomposites of graphene oxide, Ag nanoparticles, and magnetic ferrite nanoparticles for elemental mercury (Hg⁰) removal

Nanocomposites of graphene oxide, Ag nanoparticles, and magnetic ferrite nanoparticles for elemental mercury (Hg⁰) removal

Influences of Copper(II) Chloride Impregnation on Activated Carbon for Low-Concentration Elemental Mercury Adsorption from Simulated Coal Combustion Flue Gas

The distribution and occurrence of mercury in Chinese coals

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Mercury adsorption and oxidation in coal combustion and gasification processes

Cited by 262 publications

References 165 publications

Nanocomposites of graphene oxide, Ag nanoparticles, and magnetic ferrite nanoparticles for elemental mercury (Hg0) removal

Nanocomposites of graphene oxide, Ag nanoparticles, and magnetic ferrite nanoparticles for elemental mercury (Hg0) removal

Influences of Copper(II) Chloride Impregnation on Activated Carbon for Low-Concentration Elemental Mercury Adsorption from Simulated Coal Combustion Flue Gas

The distribution and occurrence of mercury in Chinese coals

Contact Info

Product

Resources

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Nanocomposites of graphene oxide, Ag nanoparticles, and magnetic ferrite nanoparticles for elemental mercury (Hg⁰) removal

Nanocomposites of graphene oxide, Ag nanoparticles, and magnetic ferrite nanoparticles for elemental mercury (Hg⁰) removal