Investigation on synergistic oxidation behavior of NO and Hg0 during the newly designed fast SCR process

Zhou, Zijian; Liu, Xiaowei; Hu, Yingchao; Xu, Jiaqiang; Cao, Xiangkun Elvis; Liao, Zhibin; Xu, Minghou

doi:10.1016/j.fuel.2018.03.152

Cited by 50 publications

(24 citation statements)

References 35 publications

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“…As for TM 5 Mo 5 and TM 5 , both molybdenum and manganese oxides were present in either as small crystallites (less than 4 nm in diameter) or non-crystalline state [27]. Figure 4a [8,31]. Two peaks of Mn 2p 3/2 are also noted at 636-647 eV on the surface of TM 5 Mo 5 after the addition of MoO 3 , which are Mn 3+ at 641.7 eV and Mn 4+ at 642.8 eV [8].…”

Section: Brunauer-emmett-teller (Bet)mentioning

confidence: 94%

“…However, Hg 0 is difficult to capture by existing air pollution control devices due to its water insolubility and volatility. In the past 20 years, the methods of mercury removal, such as adsorption by sorbents [6,7] and oxidization by oxidants [8] or catalysts [9,10], have been widely investigated. Catalytic oxidation of Hg 0 was in the spotlight when the selective catalytic reduction (SCR) system in coal-fired power plants was found to be beneficial for elemental mercury oxidation [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Molybdenum on the Activity Temperature Enlarging of Mn-Based Catalyst for Mercury Oxidation

Zhao

Liang³

et al. 2020

Catalysts

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The MnO2/TiO2 (TM5) catalyst modified by molybdenum was used for mercury oxidation at different temperatures in a fixed-bed reactor. The addition of molybdenum into TM5 was identified as significantly enlarging the optimal temperature range for mercury oxidation. The optimal mercury oxidation temperature of TM5 was only 200 °C, with an oxidation efficiency of 95%. However, the mercury oxidation efficiency of TM5 was lower than 60% at other temperatures. As for MnO2–MoO3/TiO2 (TM5Mo5), the mercury oxidation efficiency was above 80% at 200–350 °C. In particular at 250 °C, the mercury oxidation efficiency of TM5Mo5 was over 93%. Otherwise, the gaseous O2, which could supplement the lattice oxygen in the catalytic reaction, played an important role in the process of mercury oxidation over TM5Mo5. The results of X-ray photoelectron spectroscopy (XPS) suggested that mercury oxidized by O2 over TM5Mo5 followed the Mars–Maessen mechanism.

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Section: Brunauer-emmett-teller (Bet)mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effect of Molybdenum on the Activity Temperature Enlarging of Mn-Based Catalyst for Mercury Oxidation

Zhao

Liang³

et al. 2020

Catalysts

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“…Furthermore, NO could promote the Hg 0 removal efficiency in the absence and presence of O 2 . We believe that active oxygen on the sorbent surface promoted the conversion of NO to active nitrites, which were beneficial for Hg 0 oxidation [33]. Water vapor (H 2 O) exhibited only a slight inhibition effect on the Hg 0 removal performance, suggesting that the sorbent could be used in low-temperature coal-fired flue gas, which always contains H 2 O.…”

Section: Influence Of Individual Flue Gas Components On Hg 0 Removal mentioning

confidence: 99%

Highly Dispersed Mn–Ce Binary Metal Oxides Supported on Carbon Nanofibers for Hg0 Removal from Coal-Fired Flue Gas

Xia¹,

Liao

Zheng

et al. 2018

Applied Sciences

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Highly dispersed Mn–Ce binary metal oxides supported on carbon nanofibers (MnOx–CeO2/CNFs(OX)) were prepared for Hg0 removal from coal-fired flue gas. The loading value of the well-dispersed MnOx–CeO2 was much higher than those of many other reported supports, indicating that more active sites were loaded on the carbon nanofibers. In the present study, 30 wt % metal oxides (15 wt % MnOx and 15 wt % CeO2) were successfully deposited on the carbon nanofibers, and the sorbent yielded the highest Hg0 removal efficiency (>90%) within 120–220 °C under a N2/O2 atmosphere. An increase in the amount of highly dispersed metal oxides provided abundant active species for efficient Hg0 removal, such as active oxygen species and Mn4+ cations. Meanwhile, the carbon nanofiber framework provides the pathway for charge transfer during the heterogeneous Hg0 capture reaction processes. Under a N2+6%O2 atmosphere, a majority of Hg0 was removed via chemisorption reactions. The effects of flue gas composition were also investigated. O2 replenished the active oxygen species on the surface and thus greatly promoted the Hg0 removal efficiency. SO2 had an inhibitory effect on Hg0 removal, but NO facilitated Hg0 capture performance. Overall, carbon nanofibers seems to be a good candidate for the support and MnOx–CeO2/CNFs(OX) may be promising for Hg0 removal from coal-fired flue gas.

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“…With the sustained combustion of fossil fuels in boilers and diesel vehicles, massive harmful emissions of nitrogen oxides (NO x ), mainly including NO and NO 2 , have been discharged into the atmosphere [1][2][3][4][5]. In recent decades, widespread serious environmental problems, such as urban smog, acid rain, and ozone depletion, have been caused from it [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…In service, urea is firstly pyrolyzed to NH 3 , and then the generated NH 3 reduced NO x as reactions (1) and (2). erefore, the pyrolysis of urea significantly influences the following NO x removal.…”

Section: Introductionmentioning

confidence: 99%

A Review of Urea Pyrolysis to Produce NH₃ Used for NO_x Removal

Wang

Dong

Niu

et al. 2019

Journal of Chemistry

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Urea pyrolysis, from which the denitration reactant ammonia is produced, plays an important role in the urea-based NOx removal process. Research into urea pyrolysis is mostly focused on three parts: urea pyrolysis pathway, catalytic hydrolysis of HNCO, and catalytic pyrolysis of aqueous urea solution. In this paper, detailed overview on research progress of urea pyrolysis was conducted. From the review, it could be concluded that although much research has been carried out, concentration was mainly in analysis of urea pyrolysis products and exploration of catalysts used to improve ammonia yields. Little work has been done on mechanism study and development of a kinetic model with high accuracy, which are still in great need nowadays.

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Investigation on synergistic oxidation behavior of NO and Hg0 during the newly designed fast SCR process

Cited by 50 publications

References 35 publications

Effect of Molybdenum on the Activity Temperature Enlarging of Mn-Based Catalyst for Mercury Oxidation

Effect of Molybdenum on the Activity Temperature Enlarging of Mn-Based Catalyst for Mercury Oxidation

Highly Dispersed Mn–Ce Binary Metal Oxides Supported on Carbon Nanofibers for Hg0 Removal from Coal-Fired Flue Gas

A Review of Urea Pyrolysis to Produce NH₃ Used for NO_x Removal

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Investigation on synergistic oxidation behavior of NO and Hg0 during the newly designed fast SCR process

Cited by 50 publications

References 35 publications

Effect of Molybdenum on the Activity Temperature Enlarging of Mn-Based Catalyst for Mercury Oxidation

Effect of Molybdenum on the Activity Temperature Enlarging of Mn-Based Catalyst for Mercury Oxidation

Highly Dispersed Mn–Ce Binary Metal Oxides Supported on Carbon Nanofibers for Hg0 Removal from Coal-Fired Flue Gas

A Review of Urea Pyrolysis to Produce NH3 Used for NOx Removal

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A Review of Urea Pyrolysis to Produce NH₃ Used for NO_x Removal