Reduction of FeII(EDTA)-NO by Mn powder in wet flue gas denitrification technology: stoichiometry, kinetics, and thermodynamics

He, Jinjia; Wang, Xiaoping; Hrynsphan, Dzmitry; Wu, Jiali; Chen, Jianmeng; Yao, Jiachao

doi:10.1007/s11356-019-06901-5

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…Al powder was found to be an effective reducing agent for Fe II (EDTA) regeneration; however, Sn was not recommended . Our previous work confirmed that Fe II (EDTA) could be significantly regenerated by Mn powder, and the stoichiometry of Fe II (EDTA)–NO reduction with Mn powder was obtained, as shown in eq . The results have proven that Mn powder can reduce Fe II (EDTA)–NO.…”

Section: Introductionmentioning

confidence: 79%

Fe^II(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn²⁺ Recycling: Performance, Kinetics, and Mechanism

Chen

Hrynsphan³

et al. 2020

Energy Fuels

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Fe II (EDTA) solution has been considered an efficient option in wet flue gas denitrification, whereas the generated Fe II (EDTA)−NO restricts its wide application, suggesting that Fe II (EDTA)−NO reduction is the key to this process. This work investigated the performance, kinetics, and mechanism of Fe II (EDTA)−NO reduction by Mn powder coupled with manganese ion (Mn 2+ ) recovery. We initially studied the performance of Fe II (EDTA)−NO reduction with respect to the major influencing factors (i.e., the particle size of Mn powder, initial Fe II (EDTA)−NO concentration, Mn powder concentration, stirring speed, and temperature). Shrinking core model and Arrhenius law were applied to illustrate the kinetics and mechanism between Fe II (EDTA)− NO solution and Mn powder, suggesting that the solid−liquid reaction was fitted on chemical reaction control, and the activation energy was calculated as 43.0 kJ mol −1 . The effects of main operating parameters, such as precipitant concentration, pH value, and temperature, were studied on Mn 2+ recovery. Results indicated that the pseudo-second-order model could precisely describe the kinetics of Mn 2+ recovery. Finally, according to Arrhenius and Eyring−Polanyi equations, the reaction activation energy, enthalpy of activation, and entropy of activation for Mn 2+ recovery were calculated as 17.25 kJ mol −1 , 14.55 kJ mol −1 , and 252.07 J (k mol) −1 , respectively.

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Section: Introductionmentioning

confidence: 79%

Fe^II(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn²⁺ Recycling: Performance, Kinetics, and Mechanism

Chen

Hrynsphan³

et al. 2020

Energy Fuels

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“…Complex NO can be chemically reduced by a series of reducing agents, including sulfites, bisulfite, urea, reductive metals (Fe, Mn, Zn), − sodium hydrosulfite, coal pyrite, and sulfide . These reduction processes usually generate byproducts that are difficult to recover, leading to secondary pollution challenges for the chemical method.…”

Section: Introductionmentioning

confidence: 99%

Membrane-less Paired Electrolysis for Cooperative Conversion of Complex NO in a Complexing Absorption System

Jin

Wang

Sun

et al. 2022

Ind. Eng. Chem. Res.

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The complexing absorption method serves as an important wet process for potential application in NO removal of industrial exhaust gas. However, gradual saturation of the absorbent severely limits its continuous operation and denitration efficiency. Herein, a membrane-less paired electrolysis (MLPE) process was first introduced for cooperative conversion of complex NO, thereby regenerating the absorbent. Fe(II)EDTA(NO) was converted on the anode and cathode directly and indirectly; namely, complex NO was not only oxidized to NO3 –, but also reduced to NH4 +, N2, and N2O. Furthermore, NO3 – and NH4 + acted as the potentially valuable products for further reclamation and utilization. Compared with membrane anodic electrolysis (MAE) and membrane cathodic electrolysis (MCE) systems, the MLPE system achieved the lowest energy consumption and highest conversion efficiency of Fe(II)EDTA(NO). Finally, the influences of key process parameters on the complex NO electro-conversion were investigated. The MLPE process provided an efficient and convenient strategy for electro-conversion of complex NO together with absorbent regeneration and NO resource utilization.

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“…On a molecular level, NO is fixed via the conversion into NO 2 under the action of OHand O 2 [21,22]. At present, the widely used complexing agents include Fe and Co complexes, and ligands comprise amino carboxylic acids and sulfhydryl groups [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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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Reduction of FeII(EDTA)-NO by Mn powder in wet flue gas denitrification technology: stoichiometry, kinetics, and thermodynamics

Cited by 12 publications

References 30 publications

Fe^II(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn²⁺ Recycling: Performance, Kinetics, and Mechanism

Fe^II(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn²⁺ Recycling: Performance, Kinetics, and Mechanism

Membrane-less Paired Electrolysis for Cooperative Conversion of Complex NO in a Complexing Absorption System

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

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Reduction of FeII(EDTA)-NO by Mn powder in wet flue gas denitrification technology: stoichiometry, kinetics, and thermodynamics

Cited by 12 publications

References 30 publications

FeII(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn2+ Recycling: Performance, Kinetics, and Mechanism

FeII(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn2+ Recycling: Performance, Kinetics, and Mechanism

Membrane-less Paired Electrolysis for Cooperative Conversion of Complex NO in a Complexing Absorption System

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

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Fe^II(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn²⁺ Recycling: Performance, Kinetics, and Mechanism

Fe^II(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn²⁺ Recycling: Performance, Kinetics, and Mechanism

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