Mercury removal performance of brominated biomass activated carbon injection in simulated and coal-fired flue gas

Zhao, Weimeng; Geng, Xinze; Lu, Jincheng; Duan, Yufeng; Liu, Shuai; Hu, Peng; Xu, Yifan; Huang, Yaji; Tao, Jun; Gu, Xiaoli

doi:10.1016/j.fuel.2020.119131

Cited by 62 publications

(12 citation statements)

References 50 publications

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“…It was interesting to find that, 800 ppm NO in flue gas showed the highest rate, more than twofold the rate in pure atmosphere; increasing HCl concentration from 50 to 100 ppm, the equilibrium adsorption quantity decreased evidently but the initial mercury adsorption rate increased; increasing SO 2 concentration from 450 to 1500 ppm, the equilibrium adsorption quantity decreased obviously but the initial mercury adsorption rate remained almost the same; increasing O 2 concentration from 5 to 10%, and NO concentration from 250 to 800 ppm, the equilibrium adsorption quantity increased remarkably while the initial mercury adsorption rate increased concurrently, it might be the new oxygen-containing functional groups formed and more active sites created on the surface of the brominated petroleum coke. Since the mercury removal behavior of the different brominated carbon-based sorbents such as brominated biomass based, brominated coal based and commercial brominated activated carbon in coal-fired flue gas 50 are quite different from those in the simulated flue gas, mainly as a result of large proportion of Hg 2+ and Hg p , the effect of components on mercury removal of brominated petroleum coke might be different, further comparison should be conducted in the coal-fired flue gas.…”

Section: Resultsmentioning

confidence: 99%

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

Xiao¹,

Tian

Liu³

2022

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

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

Xiao¹,

Tian

Liu³

2022

RSC Adv.

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“…Activated carbons (ACs) are the most widely researched and skilled mercury adsorbents for coal-fired power plants [16][17][18][19][20][21]. However, ACs were generally limited by adsorption kinetics and equilibrium capacities, hence causing large consumptions of ACs during Hg 0 removal [22,23].…”

Section: Introductionmentioning

confidence: 99%

A Molten-Salt Pyrolysis Synthesis Strategy toward Sulfur-Functionalized Carbon for Elemental Mercury Removal from Coal-Combustion Flue Gas

Yang

Meng

et al. 2022

Energies

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The emission of mercury from coal combustion has caused consequential hazards to the ecosystem. The key challenge to abating the mercury emission is to explore highly efficient adsorbents. Herein, sulfur-functionalized carbon (S-C) was synthesized by using a molten-salt pyrolysis strategy and employed for the removal of elemental mercury from coal-combustion flue gas. An ideal pore structure, which was favorable for the internal diffusion of the Hg0 molecule in carbon, was obtained by using a SiO2 hard template and adjusting the HF etching time. The as-prepared S-C with an HF etching time of 10 h possessed a saturation Hg0 adsorption capacity of 89.90 mg·g−1, far exceeding that of the commercial sulfur-loaded activated carbons (S/C). The S-C can be applied at a wide temperature range of 25–125 °C, far exceeding that of commercial S/C. The influence of flue gas components, such as SO2, NO, and H2O, on the Hg0 adsorption performance of S-C was insignificant, indicating a good applicability in real-world applications. The mechanism of the Hg0 removal by S-C was proposed, i.e., the reduced components, including sulfur thiophene, sulfoxide, and C-S, displayed a high affinity toward Hg0, which could guarantee the stable immobilization of Hg0 as HgS in the adsorbent. Thus, the molten-salt pyrolysis strategy has a broad prospect in the application of one-pot carbonization and functionalization sulfur-containing organic precursors as efficient adsorbents for Hg0.

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“…Among these sorbents, activated carbon has been widely studied as a promising adsorbent. However, the disadvantages of a large consumption of activated carbon and the high cost limited its industrial application [22]. Noble metals, particularly Pd and Pt sorbents, exhibited high Hg 0 removal ability.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of Hg0 and H2S over a Regenerable Fe2O3/AC Catalyst

et al. 2022

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Simultaneous removal of Hg0 and H2S over a regenerable activated coke supported Fe2O3 catalyst (Fe2O3/AC) was studied in simulated coal-derived syngas. It was found that the Fe2O3/AC catalyst exhibited high capability for Hg0 and H2S removal, which was attributed to the catalytic oxidation activity of Fe2O3. Its capability for Hg0 and H2S removal increased with an increase of Fe2O3 loading amount, and the highest was at 150 °C for Hg0 removal. CO and H2 showed no obvious effect on Hg0 removal by Fe2O3/AC, while H2S had a promotion effect, which was due to S and FeSx produced by the H2S reaction on Fe2O3/AC. The results of SEM-EDX and the temperature programmed desorption experiment (TPD) revealed that Fe2O3 played a critical role in Hg0 oxidation, and HgS was generated upon the reaction of Hg0 with H2S on Fe2O3/AC. The used Fe2O3/AC catalyst after Hg0 and H2S removal could be effectively regenerated and still had high capability for Hg0 and H2S removal.

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Mercury removal performance of brominated biomass activated carbon injection in simulated and coal-fired flue gas

Cited by 62 publications

References 50 publications

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

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

A Molten-Salt Pyrolysis Synthesis Strategy toward Sulfur-Functionalized Carbon for Elemental Mercury Removal from Coal-Combustion Flue Gas

Simultaneous Removal of Hg0 and H2S over a Regenerable Fe2O3/AC Catalyst

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