Reduction of HgCl2 to Hg0 in flue gas at high temperature. Part Ⅰ: Influences of oxidative species

Huang, Tianfang; Geng, Xinze; Liu, Xiaoshuo; Liu, Jiang; Duan, Yufeng; Zhao, Shilin; Gupta, Rajender

doi:10.1016/j.fuel.2022.124417

Cited by 8 publications

(11 citation statements)

References 55 publications

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“…When the temperature increases, the van der Waals forces between molecules are limited and the physical adsorption capacity on Hg 0 is weakened. In addition, the decomposition of HgCl 2 under high temperature environment may also be an important reason for the decrease of efficiency …”

Section: Resultsmentioning

confidence: 99%

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Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Le,

Wang,

Zeng

et al. 2023

Energy Fuels

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Coal-fired power plants are a significant source of mercury pollution, necessitating the development of inexpensive and efficient adsorbents for mercury removal. This work proposes the preparation of an adsorbent using acid-chlorine-modified rice straw coke for this purpose. The characterization of the adsorbent shows that the modification increases the surface pore structure and makes the surface carry abundant oxygen-containing functional groups, which is conducive to improving the mercury removal capacity of the adsorbent. This work studies the effects of the acid–chlorine ratio, mass ratio, inlet mercury concentration, and reaction temperature on the desorption performance of modified rice straw coke and investigates the mechanism of mercury removal by combining the kinetic model and density functional theory. The results demonstrate that the optimal effect of the combined acid–chlorine modification is achieved at an acid–chlorine ratio and mass ratio of 1:2. The reaction temperature has a significant effect on the efficiency of mercury removal, and the increase of the inlet mercury concentration can promote mercury removal. The mercury adsorption process is primarily controlled by surface mass transfer and chemisorption, with chemisorption being the critical control step. The introduction of Cl and O atoms through modification creates doped structures that are highly conducive to mercury adsorption. The Cl atom exhibits greater reactivity toward the Hg atom, facilitating the removal of mercury. The presence of O atoms not only increases the abundance of oxygen-containing functional groups on the surface, but also enhances the activity of the Cl atoms. These findings provide valuable theoretical support for the application of biomass coke in the field of mercury removal, addressing mercury pollution associated with coal-fired power plants.

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Section: Resultsmentioning

confidence: 99%

“…In addition, the decomposition of HgCl 2 under high temperature environment may also be an important reason for the decrease of efficiency. 50 3.2.4. Influence of Inlet Mercury Concentration.…”

Section: Influence Of Reactionmentioning

confidence: 99%

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Le,

Wang,

Zeng

et al. 2023

Energy Fuels

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“…At present, there are three main types of flue gas mercury species monitoring technologies including the wet chemical method (OHM), , the carbon trap method (EPA Method 30B), and mercury online continuous emission monitoring system (Hg-CEMS) . Both OHM and EPA Method 30B are offline measurement methods that require manual operation, cannot provide real-time data, and are prone to human errors, , while Hg-CEMS can monitor different forms of mercury in the flue gas in real-time without manual operation .…”

Section: Introductionmentioning

confidence: 99%

Reduction of Divalent Mercury to Elemental Mercury by Fe- and Ni-Based Reductants

Li,

Shang

et al. 2024

Energy Fuels

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The conversion of divalent mercury to elemental mercury using a solid reductant is the advanced technology of the mercury continuous emission monitoring system (Hg-CEMS). This work proposed new iron-and nickelbased reductants. In the fixed-bed experiments, the reductant carriers were screened and the effects of temperature, preparation parameters, and flue gas components on the efficiency of HgCl 2 reduction were investigated. The results show that SiO 2 has no effect on Hg 0 and does not adsorb Hg 2+ , which satisfies the requirements of the reductant carrier. The reduction efficiency of both Fe/ SiO 2 and Ni/SiO 2 exceeds 90% at 400 °C, and their reduction efficiency increases to almost 95% under the optimum parameters of active component to carrier molar ratio of 2 and particle size of 8−20 mesh. Nevertheless, HCl, O 2 , and NO in the flue gas have some negative impacts on the reduction efficiency of Fe/SiO 2 and Ni/SiO 2 because they react with the active components Fe and Ni and inhibit the conversion of Hg 2+ to Hg 0 . However, SO 2 and CO 2 basically have no effect on the Hg 2+ reduction performance of the two reductants.

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“…Numerous pathways for transforming mercury have been investigated, including liquid-phase absorption, sorbent adsorption, and catalytic oxidation methods. − In particular, halogen ions like Cl – and Br – have demonstrated promise in oxidizing Hg 0 to HgX 2 (X = Cl, Br, and I) in both gas–gas and gas–liquid reaction systems. , This transformation of Hg 0 to HgX 2 aids in the deposition and absorption processes. However, HgX 2 compounds suffer from limited thermal stability and susceptibility to reduction. , In the gas–solid two-phase reaction system, the process involves both physical and chemical adsorption mechanisms. Typically, sorbent construction relies on two-electron reactions utilizing O, S, and Se as electron acceptors (Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…However, HgX 2 compounds suffer from limited thermal stability and susceptibility to reduction. 21,22 In the gas−solid two-phase reaction system, the process involves both physical and chemical adsorption mechanisms. Typically, sorbent construction relies on twoelectron reactions utilizing O, S, and Se as electron acceptors (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Halogenation-Induced Formation of Hg₃Se₂X₂ (X = Cl, Br, and I) Compounds for Multiphase Mercury Cycling

Cai,

Fan,

Hong

et al. 2023

Environ. Sci. Technol.

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Reduction of HgCl2 to Hg0 in flue gas at high temperature. Part Ⅰ: Influences of oxidative species

Cited by 8 publications

References 55 publications

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Reduction of Divalent Mercury to Elemental Mercury by Fe- and Ni-Based Reductants

Unveiling the Halogenation-Induced Formation of Hg₃Se₂X₂ (X = Cl, Br, and I) Compounds for Multiphase Mercury Cycling

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Reduction of HgCl2 to Hg0 in flue gas at high temperature. Part Ⅰ: Influences of oxidative species

Cited by 8 publications

References 55 publications

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Reduction of Divalent Mercury to Elemental Mercury by Fe- and Ni-Based Reductants

Unveiling the Halogenation-Induced Formation of Hg3Se2X2 (X = Cl, Br, and I) Compounds for Multiphase Mercury Cycling

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Unveiling the Halogenation-Induced Formation of Hg₃Se₂X₂ (X = Cl, Br, and I) Compounds for Multiphase Mercury Cycling