Elemental mercury reaction chemistry on brominated petroleum cokes

Xiao, Yi; Pudasainee, Deepak; Gupta, Rajender; Xu, Zhenghe; Diao, Yongfa

doi:10.1016/j.carbon.2017.08.031

Cited by 26 publications

(24 citation statements)

References 30 publications

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“…However, the mercury removal efficiency of S600-60-17, which was 98.6%, was much higher than that of FeS600–60–25, which was just 63%. It should be noted that, this study, as well as the study of Xiao et al [ 46 ], did not support the consensus that larger specific surface area, larger total volume, and smaller mean pore diameter led to higher mercury removal efficiency. In general, mechanochemistry and chemical activation methods could provide more exposed carbon to load C–S or C–Br.…”

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

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 ...contrasting

confidence: 99%

“…Xiao et al [ 46 ] carried out a chemical–mechanical bromination process for HSPC that which stable bromine loading was found up to 200 °C. The mercury removal efficiency of revised PC at 1% and 3% bromine was almost 100% which was slightly higher than that of Br-Norit at 11% bromine.…”

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

confidence: 99%

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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“…The brominated petroleum coke adsorbent was prepared with a detailed description in our previous papers. 22,23 The bromine modication process is known as the chemical-mechanical bromination process. The obtained petroleum coke was grounded using a ball-mill and sieved with a 100-mesh sieve, and then dried in a vacuum oven at 110 C overnight.…”

Section: Materials Preparationmentioning

confidence: 99%

“…22 Both mercury reaction chemistry and macroscopic dynamic mechanism were studied, from where the synergetic effect of the bonded bromine and inherent organic sulfur was inferred for enhancing Hg adsorption. 23,24 However, the micro-mechanism of the organic thiophene-sulfur affecting the bromine binding and elemental mercury binding continues to be unclear.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the petroleum coke material containing 5.85 wt% sulfur was obtained from the upgrading of oil sands deposits in Alberta, Canada, to make brominated carbon-based adsorbent for elemental Hg removal from the coal combustion flue gas. 23 The bromine and Hg binding chemistry is analyzed through XRD, FTIR and XPS, thermal stability of Br and Hg in the adsorbent is performed to secure the potential regular correlation of them; however, the reaction pathways and mechanisms, nature of the active petroleum coke sites and the effects of thiophene-sulfur were performed by first-principles density functional theory (DFT) calculations to help understand the significant role of thiophene-sulfur in the petroleum coke for bromine-loading and elemental Hg capture.…”

Section: Introductionmentioning

confidence: 99%

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