Simultaneous desulfurization and denitrification through an integrative process utilizing NaClO 2 /Na 2 S 2 O 8

Hao, Runlong; Yang, Shuo; Yuan, Bo; Zhao, Yi

doi:10.1016/j.fuproc.2017.01.018

Cited by 87 publications

(39 citation statements)

References 24 publications

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“…In addition, the NO removal efficiency can be maintained at higher than 80 % for a long time due to the activation of the Na 2 S 2 O 8 resulting from strong alkalinity, heat, and the presence of the H 2 O 2 . This finding was consistent with the result of Hao et al…”

Section: Introductionsupporting

confidence: 94%

“…Unlike SO 2 , the insoluble gas NO is difficult to remove using a wet scrubbing method. To date, many chemical reagents such as H 2 O 2 , KMnO 4 , NaClO 2 , NaClO, Na 2 S 2 O 8 , Fe(II)EDTA, and Co(NH 3 ) 6 2+ have been investigated to convert insoluble NO into soluble NO x , which can be subsequently removed by wet scrubbing . The use of an H 2 O 2 solution has been widely investigated by scholars due to the advantages of low cost and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic and kinetic performance of an S₂O₈^2‐/CaO₂ solution for NO removal

2019

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The thermodynamic and kinetic performance of the oxidative absorbent S2O82‐/CaO2 for NO removal was evaluated. The results indicated that the optimal molar ratio of Na2S2O8/CaO2 was 0.1:0.2 mol/mol. The experimental results showed that the combination of Na2S2O8 and CaO2 had a positive synergistic effect on the NO removal. The results of the thermodynamic calculation verified that the use of the oxidative absorbent S2O82‐/CaO2 was effective for NO removal. The results of the kinetic study showed that the NO reaction was a 1.1‐order equation and the average activation energy of the reaction was 53.0 kJ/mol. The oxidative absorbent S2O82‐/CaO2 shows potential for the simultaneous wet removal of NO and SO2 with high efficiency, no secondary pollution, and low cost.

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Section: Introductionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Thermodynamic and kinetic performance of an S₂O₈^2‐/CaO₂ solution for NO removal

2019

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“…, in the absence of NO, SO 2 had a high removal efficiency of 92.7%, further proving that the high absorption of SO 2 is due mainly to the fact that this gas has high solubility in water. As the NO concentration increased from 300 to 500 ppm, the SO 2 removal efficiency increased from 93.3% to 98.5% because more NO with O 2 could accelerate the conversion of SO 2 to sulfate [Eqns (11) and (12)]:

2 NO + O_{2} + HS O_{3}^{-} + H_{2} normalO \to 3 H^{+} + 2 {NO}_{2}^{-} + normalS O_{4}^{2 -}

2 NO + O_{2} + normalS O_{3}^{2 -} + H_{2} normalO \to 2 H^{+} + 2 {NO}_{2}^{-} + normalS O_{4}^{2 -}

…”

Section: Resultsmentioning

confidence: 99%

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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“…So far, SO 2 can be readily caught by wet process because of its higher solvability in solution. So adding oxidizing agents like KMnO 4, 5 NaClO 2, 6,7 NaClO, 8 and H 2 O 2, 9 for oxidizing NO into more soluble NO 2 and chelating agents 10,11 to unite NO, draws more interest, in which the removal of NO and SO 2 could be simultaneously finished off in a single process or equipment in wet process. For this reason, several approaches have been refined to improve NO absorption; one of which is selective catalytic reduction (SCR).…”

Section: Introductionmentioning

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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Simultaneous desulfurization and denitrification through an integrative process utilizing NaClO 2 /Na 2 S 2 O 8

Cited by 87 publications

References 24 publications

Thermodynamic and kinetic performance of an S₂O₈^2‐/CaO₂ solution for NO removal

Thermodynamic and kinetic performance of an S₂O₈^2‐/CaO₂ solution for NO removal

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

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Simultaneous desulfurization and denitrification through an integrative process utilizing NaClO 2 /Na 2 S 2 O 8

Cited by 87 publications

References 24 publications

Thermodynamic and kinetic performance of an S2O82‐/CaO2 solution for NO removal

Thermodynamic and kinetic performance of an S2O82‐/CaO2 solution for NO removal

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

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Product

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Thermodynamic and kinetic performance of an S₂O₈^2‐/CaO₂ solution for NO removal

Thermodynamic and kinetic performance of an S₂O₈^2‐/CaO₂ solution for NO removal

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