Evaluation of Fe(II)EDTA-NO reduction by zinc powder in wet flue gas denitrification technology with Fe(II)EDTA

He, Feiqiang; Deng, Xianhe; Chen, Min

doi:10.1016/j.fuel.2017.03.015

Cited by 55 publications

(30 citation statements)

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“…The Fe III EDTA concentration was obtained as the margin between the total Fe and ferrous iron . The concentrations of S(IV), including sulfite and bisulfite, and ammonium (NH 4 + ) were determined according to the literature …”

Section: Methodsmentioning

confidence: 99%

“…The preparation of Fe II EDTA-NO and the relevant experimental steps can be found in the literature. 9 The reduction was started after combining a fixed concentration of SD with the Fe II EDTA-NO solution. Finally, the concentrations of Fe II EDTA-NO, NH 4 + , sulfite and urea were analyzed separately.…”

Section: Relationship Between Fe II Edta-no and Sdmentioning

confidence: 99%

“…Complexation absorption technologies are extensively studied currently for simultaneous desulfurization and denitrification, among which Fe II EDTA, as a conventional and efficient complex absorbent of NO and SO 2 in the wet absorption of exhaust gas, has been investigated extensively since the 1970s by many research groups because of its fast complexing ability on NO . Fe II EDTA can rapidly catch NO to produce the ferrous‐nitrosyl complex Fe II EDTA‐NO [Eqn (1)], for which the equilibrium constant is generally 10 7 mol −1 . However, a notable shortcoming of Fe II EDTA is that it can be readily oxidized by O 2 to produce inanimate Fe III EDTA [Eqn (2)], which limits its further popularization and application in industry …”

Section: Introductionmentioning

confidence: 99%

“…8 Fe II EDTA can rapidly catch NO to produce the ferrous-nitrosyl complex Fe II EDTA-NO [Eqn (1)], for which the equilibrium constant is generally 10 7 mol −1 . 9 However, a notable shortcoming of Fe II EDTA is that it can be readily oxidized by O 2 to produce inanimate Fe III EDTA [Eqn (2)], which limits its further popularization and application in industry. 10,11 Fe II…”

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: Methodsmentioning

confidence: 99%

Section: Relationship Between Fe II Edta-no and Sdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…In our previous research, 25 In addition, inferring the products of TD oxidation during reaction process is very important. In our previous research, 25 In addition, inferring the products of TD oxidation during reaction process is very important.…”

Section: Reaction Mechanism On Reducing Fe II Edta-no Withtdmentioning

confidence: 99%

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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Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NO_x Remediation in Flue Gas

Yang

Liu

et al. 2021

Chem Eng & Technol

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Cobalt ethylenediamine ([Co(en) 3 ] 3+ ) is widely used for NO x remediation in flue gas. However, its industrial applications are limited due to the lack of an efficient regeneration method that converts Co 3+ to Co 2+ . Here, hydrogen chloride is applied as an additive and the performance of cobalt ethylenediamine under variable flue gas compositions is analyzed. The results demonstrate that low pH values favor the conversion of Co 3+ to Co 2+ . Further, a reaction temperature of 100°C and more than three minutes reaction time were found to accelerate the reduction of Co 3+ . The NO x removal efficiency could reach more than 70 % after the first regeneration. After 23 consecutive days of continuous experiments, the denitration efficiency of flue gas could be as high as 60 % or more.

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Evaluation of Fe(II)EDTA-NO reduction by zinc powder in wet flue gas denitrification technology with Fe(II)EDTA

Cited by 55 publications

References 46 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

Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NO_x Remediation in Flue Gas

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Evaluation of Fe(II)EDTA-NO reduction by zinc powder in wet flue gas denitrification technology with Fe(II)EDTA

Cited by 55 publications

References 46 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

Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NOx Remediation in Flue Gas

Contact Info

Product

Resources

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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

Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NO_x Remediation in Flue Gas