Mercury Removal from Flue Gas by Noncarbon Sorbents

Yang, Jianping; Xu, Hong; Zhao, Yongchun; Li, Hailong; Zhang, Junying

doi:10.1021/acs.energyfuels.0c04207

Cited by 67 publications

(23 citation statements)

References 233 publications

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“…Nevertheless, for conventional elemental mercury adsorbents, like the materials of supported metal particles, due to the agglomeration of active center, the number of active sites often reduces, and the interaction with the supports is also weakened, so it can only show mediocre performance . Furthermore, metal chalcogenides were also ideal materials for mercury immobilization and sequestration, which are the sources of mercury in nature, − whereas the affinity between the both can only be achieved under harsh conditions, such as limited reaction temperature . How to overcome the balance between desorption and adsorption is still unsolved.…”

Section: Introductionmentioning

confidence: 99%

Strengthen the Affinity of Element Mercury on the Carbon-Based Material by Adjusting the Coordination Environment of Single-Site Manganese

Huang

et al. 2021

Environ. Sci. Technol.

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Mercury, as a highly poisonous pollutant, poses a severe threat to the global population. However, the removal of Hg 0 can only be carried out at below 100 °C due to the weak binding of the adsorbent. Herein, a series of carbon-based materials with different coordination environments and atomic dispersion of single-site manganese were prepared, and their elemental mercury removal performance was systematically investigated. It was demonstrated that the coordination environment around manganese determines its electronic structure and size, thus affecting its affinity with mercury. The obtained best adsorbents atomically dispersed Mn with atom size near 0.2 nm, achieves high Hg 0 removal efficiency and over 13 mg/g Hg 0 adsorption capacity at 200 °C. And the SO 2 resistance performance of single atoms (∼0.2 nm) is much better than clusters (∼1− 2 nm) because of its high selectivity, that the effect of SO 2 is only 3%. Density functional theory (DFT) reveals that Mn with four-nitrogen atoms (Mn−N 4 -CO) is more active than other number nitrogen coordination materials. Moreover, the presence of carboxyl groups around manganese also promotes affinity for Hg 0 . This work might shed new light on the enhancement of Hg 0 affinity in carbon-based materials and the rational design of the coordination structure of the tunable Hg 0 activities.

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Section: Introductionmentioning

confidence: 99%

Strengthen the Affinity of Element Mercury on the Carbon-Based Material by Adjusting the Coordination Environment of Single-Site Manganese

Huang

et al. 2021

Environ. Sci. Technol.

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“…This approach was realized via the pyrolysis of a mixture of small organic molecules and transition-metal salts in a conventional tubular furnace, hence avoiding the barriers to large-scale production, such as complicated equipment and harsh conditions. The salts would act as a heat-transfer medium and provide an oxygen-free environment for pyrolysis [41]. Moreover, the salts catalyze the formation of a thermally stable intermediate polymerization structure, avoiding the direct sublimation of small organic molecules during heating [37,38].…”

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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“…The use of sorbents for the post-combustion removal of Hg 0 from flue gas is one promising technology. Many sorbents have been developed for Hg 0 adsorption, including carbon-based and non-carbon sorbents [13]. Carbon-based materials, such as activated carbon, show a strong Hg 0 adsorption capability.…”

Section: Introductionmentioning

confidence: 99%

The Synthesis of FeCl3-Modified Char from Phoenix Tree Fruit and Its Application for Hg0 Adsorption in Flue Gas

Chen

et al. 2022

Atmosphere

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A sample of FeCl3-modified phoenix tree fruit char (MPTFC) was prepared using pyrolysis and a facile chemical immersion method; it was proposed as an effective sorbent for Hg0 adsorption in flue gas. The BET, SEM, FTIR, and XPS methods were adopted for the characterizations of the sorbents, and a series of Hg0 adsorption tests were conducted on a bench-scale Hg0 removal setup in the lab. The morphological analysis of the sorbent indicated that the hollow fiber in phoenix tree fruit (PTF) shifted to organized directional porous tubular columns in phoenix tree fruit char (PTFC) after pyrolysis. The surface area of MPTFC increased slightly in comparison with PTF and PTFC. The MPTFC showed excellent performance for Hg0 adsorption at 200 °C in flue gas ambiance, and the Hg0 removal efficiency approached 95% with 5% (wt.%) FeCl3 modification. The presence of O2 may help to activate the MPTFC for Hg0 adsorption in flue gas, thus greatly promoting Hg0 adsorption capability. NO had a positive effect on Hg0 adsorption, while the presence of SO2 in flue gas restrained Hg0 adsorption by MPTFC. Functional groups, such as C-Cl and Fe-O, were successfully decorated on the surface of PTFC by FeCl3 modification, which contributed greatly to Hg0 adsorption. In addition, C=O, lattice oxygen (Oα), and adsorbed oxygen (Oβ) also contributed to Hg0 adsorption and oxidization.

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Mercury Removal from Flue Gas by Noncarbon Sorbents

Cited by 67 publications

References 233 publications

Strengthen the Affinity of Element Mercury on the Carbon-Based Material by Adjusting the Coordination Environment of Single-Site Manganese

Strengthen the Affinity of Element Mercury on the Carbon-Based Material by Adjusting the Coordination Environment of Single-Site Manganese

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

The Synthesis of FeCl3-Modified Char from Phoenix Tree Fruit and Its Application for Hg0 Adsorption in Flue Gas

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