Mercury removal from coal-fired flue gas by the mechanochemical S/FeS modified high sulfur petroleum coke

Ma, Anjun; Zhao, Shilin; Luo, Hui; Sun, Zhiqiang; Sun, Kang; Li, Hesong

doi:10.1016/j.fuproc.2021.107105

Cited by 17 publications

(11 citation statements)

References 44 publications

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“…For the combined mechanochemistry and chemical activation method, Ma et al [ 45 ] selected S/FeS in the mechanochemical modification that parameters were based on their previous study [ 34 ]. It was found that FeS600-60-25, which contained more FeS than other samples, had the largest specific surface area and the smallest mean pore diameter of 27.33 m 2 /g and 3.72 nm, respectively.…”

Section: The Effect Of the Evolution Of Pore Structure On Hg ...mentioning

confidence: 99%

“…The additives of element S and FeS, as modifiers, for activation of HSPC showed a certain disparity in mercury removal efficiency, which was with the same theoretical sulfur content of 17%. The mercury removal efficiency of S-revised HSPC was more than twice that of the FeS-revised sample which was 45% [ 45 ]. The functional group of C≡C and C≡N could be generated by mechanical force while C=C and C=N would be just influenced by the additives of S and FeS.…”

Section: The Effect Of the Evolution Of Functional Groups On Hg ...mentioning

confidence: 99%

“…On the other hand, it could be concluded that a higher inherent sulfur content, especially thiophene, in Br-PC1 would enhance more active sites where bromine bonded. The mercury removal performance of revised HSPC at 1% bromine [ 46 ] was about 30% more than that of modified HSPC at 25% theoretical sulfur content (TSC) [ 45 ], which indicated that Br would be a better choice due to its synergetic effect with S on the surface of HSPC for Hg 0 removal. The mechanism of Hg 0 adsorption on brominated petroleum cokes was illustrated in Figure 7 .…”

Section: The Effect Of the Evolution Of Functional Groups On Hg ...mentioning

confidence: 99%

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The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

Jiang

Diao

2022

IJERPH

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As the solid waste by-product from the delayed coking process, high-sulfur petroleum coke (HSPC), which is hardly used for green utilization, becomes a promising raw material for Hg0 removal from coal-fired flue gas. The effects of the physical–chemical evolution of HSPC on Hg0 removal are discussed. The improved micropores created by pyrolysis and KOH activation could lead to over 50% of Hg0 removal efficiency with the loss of inherent sulfur. Additional S-containing and Br-containing additives are usually introduced to enhance active surface functional groups for Hg0 oxidation, where the main product are HgS, HgBr, and HgBr2. The chemical–mechanical activation method can make additives well loaded on the surface for Hg0 removal. The DFT method is used to sufficiently explain the micro-scale reaction mechanism of Hg0 oxidation on the surface of revised-HSPC. ReaxFF is usually employed for the simulation of the pyrolysis of HSPC. However, the developed mesoporous structure would be a better choice for Hg0 removal in that the coupled influence of pore structure and functional groups plays a comprehensive role in both adsorption and oxidation of Hg0. Thus, the optimal porous structure should be further explored. On the other hand, both internal and surface sulfur in HSPC should be enhanced to be exposed to saving sulfur additives or obtaining higher Hg0 removal capacity. For it, controllable pyrolysis with different pyrolysis parameters and the chemical–mechanical activation method is recommended to both improve pore structure and increase functional groups for Hg0 removal. For simulation methods, ReaxFF and DFT theory are expected to explain the micro-scale mechanisms of controllable pyrolysis, the chemical–mechanical activation of HSPC, and further Hg0 removal. This review work aims to provide both experimental and simulational guidance to promote the development of industrial application of Hg0 adsorbent based on HSPC.

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Section: The Effect Of the Evolution Of Pore Structure On Hg ...mentioning

confidence: 99%

Section: The Effect Of the Evolution Of Functional Groups On Hg ...mentioning

confidence: 99%

Section: The Effect Of the Evolution Of Functional Groups On Hg ...mentioning

confidence: 99%

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The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

Jiang

Diao

2022

IJERPH

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“… 22 , 23 However, it is rarely used in the preparation of a petroleum coke-based mercury removal adsorbent combined with sulfur-containing modifiers. Based on our previous work, 24 the mechanochemical S-modified petroleum coke was a promising adsorbent for mercury removal from coal-fired flue gas. Zhang et al 25 characterized the effects of the flue gas component on mercury removal by a sulfur-containing sorbent (used-Fe/SC120) at 90 °C, which indicated that O 2 and SO 2 inhibited the Hg 0 removal due to the lost active sulfur sites and competitive adsorption, which was beneficial for NO in improving the Hg 0 oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is necessary to investigate the influence of flue gas components on the mechanochemical S-modified petroleum coke adsorbent developed in our previous work. 24 …”

Section: Introductionmentioning

confidence: 99%

Effects of Coal-Fired Flue Gas Components on Mercury Removal by the Mechanochemical S-Modified Petroleum Coke

Zhao

Luo

et al. 2022

ACS Omega

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In this work, the effects of coal-fired flue gas components (O 2 , CO 2 , SO 2 , and NO) on the Hg 0 removal by the promising mercury removal adsorbent mechanochemical S-modified petroleum coke were characterized and analyzed in terms of the Hg 0 removal efficiency, mercury adsorption capacity, and mercury mass balance. The results show that the mechanochemical S-modified petroleum coke with a theoretical sulfur content of 21% (named TSC-21) is the best candidate for mercury removal based on the Hg 0 removal efficiency, Hg 0 removal capacity, and difference ratio of Hg 0 removal capacity (anti-interference ability) in the basic and full-component simulated flue gas atmosphere (N 2 + O 2 + CO 2 , N 2 + O 2 + CO 2 + SO 2 + NO). The maximum value (MV) and stable value (SV) of the Hg 0 removal efficiency of TSC-21 in the basic simulated flue gas atmosphere are 99.25% (MV) and 91.17% (SV), respectively. O 2 , CO 2 , and NO all promote the Hg 0 removal by the adsorbent, but they benefit the Hg 0 oxidation while inhibiting the Hg 0 adsorption. The promoting effect of O 2 on the Hg 0 removal by TSC-21 is affected by the reaction time, which is especially obvious after 1 min. The presence of SO 2 inhibits the oxidation and adsorption of Hg 0 , which in turn reduces the Hg 0 removal performance of the adsorbent. The improving effects on the oxidative escape of Hg 0 by CO 2 is higher than that by NO and O 2 . TSC-21 acts more as an oxidant than an adsorbent for Hg 0 removal.

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Acid treatment for enhancing Hg0 removal efficiency of chlorine-loaded biochar: mechanism and kinetic analysis

Zhang,

Wang,

Yang

et al. 2023

Environ Sci Pollut Res

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Mercury removal from coal-fired flue gas by the mechanochemical S/FeS modified high sulfur petroleum coke

Cited by 17 publications

References 44 publications

The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

Effects of Coal-Fired Flue Gas Components on Mercury Removal by the Mechanochemical S-Modified Petroleum Coke

Acid treatment for enhancing Hg0 removal efficiency of chlorine-loaded biochar: mechanism and kinetic analysis

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