Selection of catalytically active elements for removing NO and CO from flue gas at low temperatures

Liu, Kaijie; Yu, Qingbo; Liu, Jinlin; Wang, Kun; Han, Zhicheng; Yang, Xuan; Qin, Qin

doi:10.1039/c7nj02694c

Cited by 37 publications

(13 citation statements)

References 29 publications

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“…According to previous reports, 21 the chemical properties of Fe II EDTA-NO are somewhat similar to those of nitro compounds. When SD was used to reduce these nitro compounds, it was always turned into SO 3 2− and HSO 3 −19…”

Section: Resultsmentioning

confidence: 99%

“…. Therefore, in terms of reducing Fe II EDTA-NO by SD, SO 3 2− and HSO 3 − also are considered as the main products of SD conversion. Hence, variations in the SO 3 2− and HSO 3 − concentrations were investigated.…”

Section: Resultsmentioning

confidence: 99%

“…The large‐scale utilization of fossil energy has led to a series of severe environmental problems including acidification, photochemical smog, eutrophication and ozone depletion . Nitrogen oxide (NO x , of which NO accounts for 95%) and sulfur dioxide (SO 2 ) generally are considered to be the priority pollutants from fuel gases . Therefore, the emissions of NO x and SO 2 have been rigorously controlled and regulated by environment protection departments around the world.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Nitrogen oxide (NO x , of which NO accounts for 95%) and sulfur dioxide (SO 2 ) generally are considered to be the priority pollutants from fuel gases. 3 Therefore, the emissions of NO x and SO 2 have been rigorously controlled and regulated by environment protection departments around the world. Although SO 2 and NO can be removed by the limestone-lime method 4 and selective catalytic reduction (SCR) 5,6 processes, respectively, the combination of these methods for simultaneous desulfurization and denitrification requires a large area, intricate processes and high operating costs, which results in ammonia leakage and spent catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Long et al 12 used Fe II EDTA solution coupled with the regeneration catalyzed by activated carbon, which can maintain high NO and SO 2 removal efficiency for a long period of time. Wu et al 13 employed Fe II EDTA combined with Na 2 SO 3 solution to remove NO and SO 2 from simulated flue gas, and found that SO 3 2− improved NO removal. Chen et al 14 carried out the simultaneous removal of SO 2 and NO by Fe II EDTA with the denitrifying bacteria Pseudomonas and sulfatereducing bacteria Desulfovibrio in a rotating drum biofilter, in which the maximal removal efficiency of SO 2 and NO was 98.5% and 93%, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous removal of NO and SO₂ from flue gas by Fe^IIEDTA/sodium dithionite solutions

Zhu

Chen

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The SO2 and NO emitted from coal‐fired power plants have caused serious air pollution in China. FeIIEDTA complexation technology is one of the most promising processes to realize the simultaneous removal of SO2 and NO. However, FeIIEDTA is easily oxidized to FeIIIEDTA, causing loss of activity, which limits its further application. To solve this problem, sodium dithionite (SD) combined with FeIIEDTA was used for the simultaneous removal of SO2 and NO. RESULTS Results showed that the SO2 removal efficiencies were ≈92–99% in all experiments, whereas the NO removal fluctuated substantially under different operating conditions. Specifically, SD can markedly improve NO removal efficiency, and the optimal FeIIEDTA:SD ratio was 3 mmol L–1:0.026 mol L–1. With increasing temperature, pH value, SO2 concentration or O2 concentration, the NO removal efficiency increased first and then decreased. As the NO concentration increased, the NO removal efficiency continually decreased. Finally, based on the analysis of different ion concentrations, the main products were identified as sulfite, sulfate, ammonium, nitrite and nitrate. CONCLUSION The synergistic mechanism of SD and FeIIEDTA on SO2 and NO was investigated. SD can regenerate FeIIEDTA solution by reducing FeIIIEDTA and FeIIEDTA‐NO. These fundamental findings can offer valuable guidance for industrial denitrification and desulfurization by mixed FeIIEDTA and SD systems. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simultaneous removal of NO and SO₂ from flue gas by Fe^IIEDTA/sodium dithionite solutions

Zhu

Chen

et al. 2020

J of Chemical Tech & Biotech

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Evaluation of Fe^IIEDTA‐NO reduction by thiourea dioxide in NO removal with Fe^IIEDTA

Zhu

Chen

et al. 2019

Asia-Pacific J Chem Eng

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Reducing Fe II EDTA-NO is key for NO absorption with Fe II EDTA absorbent.In this work, the reducing agent thiourea dioxide (TD) was for the first time employed for reducing Fe II EDTA-NO. The behavior and kinetics of reducing Fe II EDTA-NO with TD had been examined with different pH value, varied TD concentrations, and various temperatures. The results investigated that Fe II EDTA-NO reducing rate rose with pH value increasing as well as elevated temperature. The reaction order of Fe II EDTA-NO by TD was proved to be 2 on Fe II EDTA-NO. Meanwhile, activating energy, activating entropy, and activating enthalpy of reducing Fe II EDTA-NO by TD were separately calculated to be 49.583 kJ mol −1 , −64.956 J k −1 mol −1 , and 46.943 kJ mol −1 . The simultaneous reduction of Fe III EDTA and Fe II EDTA-NO by TD was investigated. Results showed that TD was more powerful in reducing Fe III EDTA and Fe II EDTA-NO compared with other reduction systems. Finally, nitric oxide removal experiment illustrates that TD can remarkably strengthen the NO removal with Fe II EDTA solution. These theoretical findings could provide constructive suggestions for industrial tail gas denitrification employing associative Fe II EDTA and TD system.

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Enhanced Low‐Temperature Oxidation Activity of Cu‐Doped Highly Active Pd‐Based Catalysts

Xu,

Gai,

Wang

et al. 2024

ChemCatChem

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Pd‐based catalysts supported on cerium‐zirconium (CZ) oxygen storage materials (OSM) have emerged as promising candidates for the catalytic oxidation of CH4 and CO. However, achieving efficient and stable treatment of CH4 and CO in exhaust gases with Pd‐based catalysts remains a long‐term challenge. To address this, we propose a straightforward strategy of doping the supports with Cu to enhance the catalytic performance of Pd/Ce0.4Zr0.5La0.1O1.95 catalysts. Performance tests revealed that the catalytic activity of the Cu‐doped catalysts significantly improved, with T90 (CH4) decreasing from 418 to 301 ℃ and T90 (CO) decreasing from 141 to 113 ℃. Notably, the copper‐doped catalysts exhibited enhanced water and sulfur resistance while maintaining excellent thermal stability. The CO conversion decreased by less than 2% after a thermal deactivation experiment lasting over 100 hours. The reduction in particle size and the increase in specific surface area due to copper doping are key factors contributing to the improved total oxygen storage capacity (OSC). The main reasons for the increase in total OSC are likely the reduced particle size and increased specific surface area.

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Selection of catalytically active elements for removing NO and CO from flue gas at low temperatures

Abstract: The metal elements Mn, Cu, Pb and V have been selected for removing NO and CO via a thermodynamic study.

Cited by 37 publications

References 29 publications

Simultaneous removal of NO and SO₂ from flue gas by Fe^IIEDTA/sodium dithionite solutions

Simultaneous removal of NO and SO₂ from flue gas by Fe^IIEDTA/sodium dithionite solutions

Evaluation of Fe^IIEDTA‐NO reduction by thiourea dioxide in NO removal with Fe^IIEDTA

Enhanced Low‐Temperature Oxidation Activity of Cu‐Doped Highly Active Pd‐Based Catalysts

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Selection of catalytically active elements for removing NO and CO from flue gas at low temperatures

Abstract: The metal elements Mn, Cu, Pb and V have been selected for removing NO and CO via a thermodynamic study.

Cited by 37 publications

References 29 publications

Simultaneous removal of NO and SO2 from flue gas by FeIIEDTA/sodium dithionite solutions

Simultaneous removal of NO and SO2 from flue gas by FeIIEDTA/sodium dithionite solutions

Evaluation of FeIIEDTA‐NO reduction by thiourea dioxide in NO removal with FeIIEDTA

Enhanced Low‐Temperature Oxidation Activity of Cu‐Doped Highly Active Pd‐Based Catalysts

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Product

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Simultaneous removal of NO and SO₂ from flue gas by Fe^IIEDTA/sodium dithionite solutions

Simultaneous removal of NO and SO₂ from flue gas by Fe^IIEDTA/sodium dithionite solutions

Evaluation of Fe^IIEDTA‐NO reduction by thiourea dioxide in NO removal with Fe^IIEDTA