ZnS/AC sorbent derived from the high sulfur petroleum coke for mercury removal

Huo, Qihuang; Wang, Yahui; Chen, Huijun; Han, Lupeng; Wang, Jiancheng; Wang, Bao; Chang, Liping; Xie, Kui

doi:10.1016/j.fuproc.2019.03.025

Cited by 63 publications

(23 citation statements)

References 49 publications

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“…The pore structure of raw HSPC is identified as poor for Hg 0 adsorption due to its dense structure. In particular, the Brunauer–Emmett–Teller (BET) surface area of raw HSPC is tested to be less than 1.1 m 2 /g [ 36 ] and the total pore volume is almost zero [ 37 ]. It is the reason for the poor performance of pore structure on Hg 0 adsorption and also the lack of positions for active sites.…”

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

confidence: 99%

“…For the combined pyrolysis and chemical activation method, Huo et al [ 37 ] prepared AC from HSPC with zinc nitrate in the following process, 2 h ultrasound mixing, 12 h dry at 60 °C, 5 h calcine, and physical activation at high temperature. The specific surface area of the ZnS/AC sample was 0.21 m 2 /g, which also indicated that chemical activation could not well improve the pore structure [ 38 ].…”

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

confidence: 99%

“…Apart from sulfur-containing additives as modifiers, there was one study concentrated on the inherent sulfur in HSPC for Hg 0 removal. Huo et al [ 37 ] noticed that the local sulfur in HSPC could be utilized for element mercury removal by in-site method with the additive of zinc nitrate. The result of XRD showed the generation and transformation process of ZnO and ZnS, where the peaks of ZnO disappeared and ZnS reached the highest level under 750 °C.…”

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

confidence: 99%

“… Hg 0 removal performance of different ZnS sorbents at different temperatures [ 37 ]. Reprinted/adapted with permission from Ref.…”

Section: Figurementioning

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 Pore Structure On Hg ...mentioning

confidence: 99%

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

confidence: 99%

“… Hg 0 removal performance of different ZnS sorbents at different temperatures [ 37 ]. Reprinted/adapted with permission from Ref.…”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

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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“…ZnS is an important semiconductor with multiple structures, which has unique chemical and electronic properties and has various prospective applications . Previous studies indicated that ZnS is an efficient heavy metal sorbent, especially for mercury removal. − ZnS contains high ratio sulfur, which can provide plentiful active S sites for adsorbing mercury . Li et al.…”

Section: Introductionmentioning

confidence: 99%

Different Crystal Forms of ZnS Nanomaterials for the Adsorption of Elemental Mercury

Yang

Huang

et al. 2021

Environ. Sci. Technol.

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ZnS is a promising sorbent in recovering Hg0 from industrial flue gas due to its excellent Hg0 adsorption capacity. However, the internal structure–activity relationship still needs to be further clarified. In this work, ZnS sorbents with different structures were synthesized with the hydrothermal method by tuning the temperature. The samples had significant differences in the crystallinity, morphology, particle size, and sulfur (S) active sites. The results indicated that Hg0 removal performance was determined by the specific surface area and S active sites. ZnS synthesized at low temperatures (80-ZnS and 120-ZnS) had a larger surface area, while the S sites on the high-temperature-synthesized sample (160-ZnS) were more active for Hg0 adsorption. The 160-ZnS sample exhibited a much higher Hg0 adsorption amount per unit surface area. Further characterization revealed that S2 2– and S x were the main active sites for Hg0 adsorption. S x existed in the form of long-chain polysulfur (L-S x ) on 80-ZnS and 120-ZnS, while it exhibited in the form of short-chain polysulfur (S-S x ) on 160-ZnS. L-S x had negligible adsorption ability, while S-S x had a high affinity for Hg0. Hg0 can react with S2 2– and S-S x , forming α-HgS and β-HgS, respectively. The new insight in this work can provide theoretical guidance for the design and structure optimization of ZnS, facilitating its practical industrial application.

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