Evaluation of Modified Activated Carbons for Mercury Reemission Control During Neutralization of a Simulated Wastewater from the Direct Contact Cooler of a Pressurized Oxy-Combustion Process

Dastgheib, Seyed A.; Mock, Justin; Ilangovan, Tina

doi:10.1021/acs.iecr.0c05555

Cited by 3 publications

(1 citation statement)

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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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