Elemental mercury capture and oxidation by a regenerable manganese-based sorbent: The effect of gas composition

Scala, Fabrizio; Cimino, Stefano

doi:10.1016/j.cej.2014.11.094

Cited by 54 publications

(32 citation statements)

References 19 publications

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“…It can be concluded that Hg oxidation follows L-H mechanism, where Hg oxidation reaction starts with the interaction of adsorbed Hg 0 with the active chlorinated sites on MnO 2 (1 1 0) surface. This conclusion was validated by a recent experimental study by Scala et al [39]. They found that the presence of HCl promotes Hg oxidation and both HCl and Hg are adsorbed on the surface of MnO x /Al 2 O 3 .…”

Section: Reaction Mechanism Of Hg Oxidation By Hcl Over Mno 2 Surfacesupporting

confidence: 78%

Oxidation mechanism of elemental mercury by HCl over MnO2 catalyst: Insights from first principles

Zhang

Liu

Yang

et al. 2015

Chemical Engineering Journal

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Section: Reaction Mechanism Of Hg Oxidation By Hcl Over Mno 2 Surfacesupporting

confidence: 78%

Oxidation mechanism of elemental mercury by HCl over MnO2 catalyst: Insights from first principles

Zhang

Liu

Yang

et al. 2015

Chemical Engineering Journal

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“…The effects of SO 2 concentration on Hg 0 oxidation efficiency of niobium‐loaded catalysts are shown in Figure . SO 2 had a negative influence on Hg 0 oxidation and this result was consistent with previous research . As shown in Figure , the inhibition effect of SO 2 varied for different niobium‐loaded catalysts.…”

Section: Resultssupporting

confidence: 91%

“…However, no efficient oxidation of Hg 0 could be observed with a gas stream of 20 μL/L (ppmv) HCl, where no O 2 passed through the catalysts. This result suggested that a certain mechanism of Hg 0 oxidation removal by O 2 together with HCl was active, which agreed with former research . It is probable that HCl in the gas phase is firstly absorbed onto the niobium‐loaded catalyst surface, where it becomes the active site for Hg 0 oxidation and then reacts with gas‐phase mercury to produce HgCl 2 , in accordance with the Eley‐Rideal mechanism.…”

Section: Resultssupporting

confidence: 89%

Catalytic oxidation removal of gaseous elemental mercury in flue gas over niobium‐loaded catalyst

Wang

2016

Can J Chem Eng

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Nb-Co-Ce/Al 2 O 3 catalysts prepared by impregnation, sol-gel method, and co-precipitation were examined for elemental mercury (Hg 0 ) oxidation in a simulated coal combustion flue gas. The catalysts were characterized by SEM-EDS, BET, XRD, FTIR, and XPS techniques. The performances of different niobium-loaded catalysts on Hg 0 oxidation efficiency with regard to preparation method, assistant, reaction temperature, and typical individual flue gas were investigated. The results showed that the Hg 0 oxidation efficiency performed at the highest value for niobium-loaded catalysts at 523 K. SO 2 was observed to have a negative effect on Hg 0 oxidation. The niobium-loaded catalysts prepared by the sol-gel method and co-precipitation exhibited higher Hg 0 oxidation efficiency than that prepared by impregnation, due to higher specific surface area and more exposure of active sites. However, it also results in these catalysts being affected by SO 2 more easily. An enhancing effect of O 2 was observed and an addition of HCl would promote the Hg 0 oxidation further. Results also indicated that synergistic effects between NbO x , CoO x , and CeO x could promote the sustainable capacity of Hg 0 oxidation for Nb-Co-Ce/Al 2 O 3 catalysts. Hg 0 oxidation over Nb-Co-Ce/Al 2 O 3 catalysts is thought to follow a Mars-Maessen mechanism in which lattice oxygen derived from NbO x would react with absorbed Hg 0 .

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“…The presence of water (H 2 O) vapor has been proven to have a negative influence on Hg 0 removal . This could be due to the competition between H 2 O and active sites, as well as the unexpected reaction between other flue gas components such as HCl, NO, and SO 2 .…”

Section: Hg0 Removalmentioning

confidence: 99%

“…The presence of water (H 2 O) vapor has been proven to have a negative influence on Hg 0 removal. [113,114] This could be due to the competition between H 2 O and active sites, as well as the unexpected reaction between other flue gas components such as HCl, NO, and SO 2 . Zhao et al [61] prepared a-Fe 2 O 3 -CeO 2 /activated coke and evaluated the effect of H 2 O on Hg 0 removal process.…”

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

Role of Ceria in the Design of Composite Materials for Elemental Mercury Removal

Jampaiah

Chalkidis

Sabri

et al. 2018

The Chemical Record

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The necessity to drastically act against mercury pollution has been emphatically addressed by the United Nations. Coal‐fired power plants contribute a great deal to the anthropogenic emissions; therefore, numerous sorbents/catalysts have been developed to remove elemental mercury (Hg0) from flue gases. Among them, ceria (CeO2) has attracted significant interest, due to its reversible Ce3+/Ce4+ redox pair, surface‐bound defects and acid‐base properties. The removal efficiency of Hg0 vapor depends among others, on the flue gas composition and temperature. CeO2 can be incorporated into known materials in such a way that the abatement process can be effective at different operating conditions. Hence, the scope of this account is to discuss the role of CeO2 as a promoter, active phase and support in the design of composite Hg0 sorbents/catalysts. The elucidation of each of these roles would allow the integration of CeO2 advantageous characteristics to such degree, that tailor‐made environmental solution to complex issues can be provided within a broader application scope. Besides, it would offer invaluable input to theoretical calculations that could enable the materials screening and engineering at a low cost and with high accuracy.

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Elemental mercury capture and oxidation by a regenerable manganese-based sorbent: The effect of gas composition

Cited by 54 publications

References 19 publications

Oxidation mechanism of elemental mercury by HCl over MnO2 catalyst: Insights from first principles

Oxidation mechanism of elemental mercury by HCl over MnO2 catalyst: Insights from first principles

Catalytic oxidation removal of gaseous elemental mercury in flue gas over niobium‐loaded catalyst

Role of Ceria in the Design of Composite Materials for Elemental Mercury Removal

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