Novel Capture Technologies: Non‐carbon Sorbents and Photochemical Oxidations

Uffalussy, Karen J.; Granite, Evan J.

doi:10.1002/9783527658787.ch21

Cited by 4 publications

(7 citation statements)

References 26 publications

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“…A proposed chemical reaction mechanism for Tl oxidation is summarized in eqs –: A similar Mars–Maessen type mechanism was previously proposed by Granite for the removal of mercury by manganese oxide in coal-derived flue gases …”

Section: Results and Discussionmentioning

confidence: 85%

“…35 Other oxidizable species present within flue gas, such as sulfur dioxide, can compete with thallium for oxidation by manganese oxide, and the same effect by sulfur dioxide was observed in the removal of mercury by manganese oxide. 36 On the other hand, the average pore diameter of MOFs is 1.7 nm (Table 2), which belongs to the microporous range. The microporous adsorption of SO 2 is the volume filling of micropores.…”

Section: Resultsmentioning

confidence: 99%

“…A similar Mars−Maessen type mechanism was previously proposed by Granite for the removal of mercury by manganese oxide in coal-derived flue gases. 36 3.5. Regeneration of the Used Catalyst.…”

Section: Resultsmentioning

confidence: 99%

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Efficient Removal of Thallium from Flue Gas Using Manganese-Based MOF Catalysts by Gas–Solid Phase Catalytic Oxidation and Adsorption

Jia

Wang

et al. 2020

Ind. Eng. Chem. Res.

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Thallium (Tl) is known to be extremely toxic. However, thallium pollution from smelting tail gas has long been neglected as an environmental issue. This study aims to develop a gaseous thallium control technology based on manganese-based metal–organic framework (MOF) catalysts, using a manganese centered paddle wheel structure as a support. Tl removal testing showed that these catalysts were effective at both adsorbing and oxidizing Tl(I), producing Tl(III), which is less harmful. Details of the catalytic oxidation mechanism were investigated, which demonstrated that Tl(I) loses electrons to Mn(III), Mn(IV), and O2, generating Tl2O3. Over 90% removal efficiency was maintained for 10 h by a MOF catalyst with 10% Mn loading, at 423 K with 10% O2 in the feed gas, which was determined to be the optimal level of O2. SO2 inhibited thallium removal in this system, while 10% CO2 had no significant effect. Regeneration through acid washing was found to be effective, with the catalyst maintaining thallium removal efficiency for five regeneration cycles. Molecular simulation of Tl removal is investigated, based on which the possible reaction path is found.

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Section: Results and Discussionmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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Efficient Removal of Thallium from Flue Gas Using Manganese-Based MOF Catalysts by Gas–Solid Phase Catalytic Oxidation and Adsorption

Jia

Wang

et al. 2020

Ind. Eng. Chem. Res.

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“…[15] Lattice oxygen is a versatile oxidant, and previous studies have proposed that many metal oxide sorbents or catalysts can capture or oxidize mercury through a Mars-Maessen mechanism. [9,16,17] The active components of common transition metals used in catalysts include CeO 2 , CuO, MnO 2 , Co 3 O 4 , Fe 2 O 3 , Cr 2 O 3 , and so on. [18][19][20][21][22][23][24][25] CeO 2 is an abundant, non-toxic, and cheap material.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of elemental mercury and NO from flue gas by the CeO₂/TiO₂ catalysts and the mechanism investigation

Long

Liu

et al. 2021

Can J Chem Eng

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Mercury pollution has become one of the high-profile environmental problems in the world. A series of Ce y Ti catalyst were synthesized by sol-gel method, and the process of simultaneous conversion of NO and removal of mercury (Hg 0 ) in the flue gas was studied. BET, SEM, and XRD were used to systematically detect the physicochemical properties of the catalysts, which show that excessive Ce loading would make its specific surface area reduce. The NO conversion efficiency would increase with the increase of the Ce loading. The optimal Ce/Ti mass ratio was 0.3. A part of the adsorbed NO would be oxidized by the active oxygen species on the catalyst surface to produce a certain amount of nitrogen-containing substances, such as NO + , NO 3À , or NO 2 . The produced substances could promote the adsorption and oxidation of Hg 0 . The NO conversion was very dependent on the oxygen in the flue gas. The activity of the Ce 0.3 Ti catalyst was promoted in the presence of O 2 . SO 2 and H 2 O would inhibit the reaction of NO conversion and Hg 0 removal. The mechanisms of the catalytic system have been proved via the Mars-Maessen mechanism.

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“…Sir: I am writing in response to the excellent and timely article titled “Mercury Oxidation by UV Irradiation: Effect of Contact Time, UV Wavelength, and Moisture Content” . Sensitized oxidation of elemental mercury using 253.7 nm ultraviolet radiation can be an excellent strategy for capture of this pollutant; our technique (the GP-254 Process) has been examined at laboratory scale, bench scale, and in slipstreams of real flue gas. − Sorbents and fly ashes have a tendency to exhibit greater capacities for oxidized mercury, in comparison to elemental mercury . Oxidized mercury is soluble in water, whereas elemental mercury is highly insoluble.…”

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confidence: 99%

Novel Capture Technologies: Non‐carbon Sorbents and Photochemical Oxidations

Cited by 4 publications

References 26 publications

Efficient Removal of Thallium from Flue Gas Using Manganese-Based MOF Catalysts by Gas–Solid Phase Catalytic Oxidation and Adsorption

Efficient Removal of Thallium from Flue Gas Using Manganese-Based MOF Catalysts by Gas–Solid Phase Catalytic Oxidation and Adsorption

Simultaneous removal of elemental mercury and NO from flue gas by the CeO₂/TiO₂ catalysts and the mechanism investigation

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Novel Capture Technologies: Non‐carbon Sorbents and Photochemical Oxidations

Cited by 4 publications

References 26 publications

Efficient Removal of Thallium from Flue Gas Using Manganese-Based MOF Catalysts by Gas–Solid Phase Catalytic Oxidation and Adsorption

Efficient Removal of Thallium from Flue Gas Using Manganese-Based MOF Catalysts by Gas–Solid Phase Catalytic Oxidation and Adsorption

Simultaneous removal of elemental mercury and NO from flue gas by the CeO2/TiO2 catalysts and the mechanism investigation

Comment on “Mercury Oxidation by UV Irradiation: Effect of Contact Time, UV Wavelength, and Moisture Content”

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Simultaneous removal of elemental mercury and NO from flue gas by the CeO₂/TiO₂ catalysts and the mechanism investigation