Kinetic mechanism on elemental mercury adsorption by brominated petroleum coke in simulated flue gas

Xiao, Yi; Tian, Lei; Liu, Xiuyun

doi:10.1039/d2ra02318k

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…The adsorbent at a mercury concentration of 36.8 μg/m 3 has the lowest adsorption capacity, and the adsorption capacity at a mercury concentration of 61.6 μg/m 3 is slightly higher than 54.4 μg/m 3 . This may be because the increase of inlet mercury concentration can enhance the mass transfer rate of mercury on the adsorbent surface and the diffusion rate inside the adsorbent . The physical adsorption of mercury by the adsorbent is enhanced, and adsorbed mercury is then reacted with chemically active sites in contact within the adsorbent.…”

Section: Resultsmentioning

confidence: 99%

“…This may be because the increase of inlet mercury concentration can enhance the mass transfer rate of mercury on the adsorbent surface and the diffusion rate inside the adsorbent. 51 The physical adsorption of mercury by the adsorbent is enhanced, and adsorbed mercury is then reacted with chemically active sites in contact within the adsorbent. So the increase of the inlet mercury concentration can play a role in promoting the removal of mercury.…”

Section: Influence Of Reactionmentioning

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%

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

View full text Add to dashboard Cite

show abstract

Study on mercury adsorption mechanism of iron-modified biomass char in coal-fired flue gas based on density functional theory

Qin

Wang

et al. 2023

Fuel Processing Technology

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Evaluation of the use of agricultural waste materials as low-cost and eco-friendly sorbents to remove dyes from water: a review

Ali,

Zeidan,

Amar

2023

Desalination and Water Treatment

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Kinetic mechanism on elemental mercury adsorption by brominated petroleum coke in simulated flue gas

Abstract: A waste byproduct of petroleum coke was obtained as a precursor modified with bromine for elemental mercury capture from simulated flue gas on a bench scale fixed-bed reactor.

Cited by 3 publications

References 44 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

Study on mercury adsorption mechanism of iron-modified biomass char in coal-fired flue gas based on density functional theory

Evaluation of the use of agricultural waste materials as low-cost and eco-friendly sorbents to remove dyes from water: a review

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