Experimental Investigation on the Kinetics of NO Complex Absorption through Fe<sup>II</sup>EDTA Solvent in a Double-Stirred Reactor

Du, Qian; Zhao, Haili; Ming, L.; Gao, Jianmin; Zhao, Guangbo; Wu, Shaohua

doi:10.1021/ie102501h

Cited by 21 publications

(21 citation statements)

References 27 publications

(33 reference statements)

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“…For ferrous chelating solutions, such as Fe II -EDTA and Fe II -NTA, their denitration efficiencies decrease in the presence of O 2 . However, some experiments have shown that although there are competitive coordination reactions between NO and O 2 , an appropriate increase in O 2 content contributes to the uptake of NO by cobalt–amine. − The mechanism is that cobalt–amine activates O 2 to produce active oxygen intermediates, which rapidly oxidize the absorbed NO to nitrites and nitrates (reactions and ) .…”

Section: Results and Discussionmentioning

confidence: 99%

Performance of Several Cobalt–Amine Denitration Solutions and Their Catalytic Regeneration by Graphene

Jiang

Wei

2019

Environ. Sci. Technol.

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Little attention has been focused on the use of cobalt(II)− amine chelates for the absorption of nitric oxide (NO) in flue gas, and research on the regeneration of cobalt denitration solutions is relatively rare.To supplement this research gap, several promising ethylenediamine derivatives were screened out. They are N-(2-hydroxyethyl)ethylenediamine, 1,2-propanediamine, and 1,2-cyclohexanediamine. These cobalt(II)−amine solutions are effective for denitration and have not been reported yet. However, they are also easily oxidized to the corresponding cobalt(III) species. In the presence of a nanocarbon material, cobalt(III) components are reduced to cobalt(II) components and release oxygen by reacting with acids. The effects of solution pH, temperature, and graphene dosage on the regeneration process were investigated. A proper addition of graphene as a catalyst contributes to the progress of regeneration. Catalytic mechanisms and regeneration performance have been discussed as much as possible. These mechanisms are related to the oxidation reactions and oxygenated species of cobalt complexes. The carbon material here acts as a catalyst for adsorbing cobalt chelates and accelerating charge transfer in the oxygen evolution reaction.

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Section: Results and Discussionmentioning

confidence: 99%

Performance of Several Cobalt–Amine Denitration Solutions and Their Catalytic Regeneration by Graphene

Jiang

Wei

2019

Environ. Sci. Technol.

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“…b N/A stands for not applicable. Weisweiler et al 53 7 9.40 × 10 7 Chien et al 50 3−11 3.70 × 10 7 Du et al 12 1.5−2.5 1.14 × 10 8 Mori 62 stated that the oxidation of the peroxo ion 2c to a superoxo compound was difficult without a strong oxidant. The direct oxidation of ammoniacal Co(II) complexes to ammoniacal Co(III) was also challenging in the absence of a catalyst.…”

Section: ■ Discussion and Implicationsmentioning

confidence: 99%

“…The value of Henry's constant in an electrolyte can be associated with that in water at the same temperature according to the following: 26 (12) where the ionic strength of a pure solution can be described as the following: (13) and the salting-out parameter k of an aqueous solution is the summation of the contributions of the cation, anion and gas:…”

Section: ■ Calculationsmentioning

confidence: 99%

On the Kinetics of the Absorption of Nitric Oxide into Ammoniacal Cobalt(II) Solutions

Tan²

2014

Environ. Sci. Technol.

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Experiments were conducted using a custom double-stirred tank reactor to determine the rate constants of reactions between nitric oxide (NO) and both pentaaminecobalt(II) and hexaaminecobalt(II) at temperatures of 298.2 and 303.2 K and pH levels between 8.50 and 9.87 under atmospheric pressure. The NO concentration of simulated flue gas stream ranged from 400 to 1400 ppmv. Ammoniacal cobalt(II) solutions were prepared by adding aqueous ammonia into a cobalt(II) nitrate solution in the presence of concentrated ammonium nitrate. The reaction rate constants were calculated with an enhancement factor for gas absorption associated with parallel chemical reactions. The results showed that the reaction between NO and pentaaminecobalt(II) was first order with respect to both the NO and the pentaamminecobalt(II) ion. Similarly, the reaction between NO and hexaamminecobalt(II) was first order with respect to both the NO and the hexaamminecobalt(II) ion. The forward reaction rate constants of these two reactions were 6.43 × 10(6) and 1.00 × 10(7) L · mol(-1) · s(-1) at 298.2 K, respectively, and increased to 7.57 × 10(6) and 1.12 × 10(7) L · mol(-1) · s(-1) at 303.2 K, respectively. Ammoniacal cobalt(II) solutions also have the potential to simultaneously remove CO2, SO2, and NOx from postcombustion flue gas.

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“…Fe(II)EDTA-NO and Fe(III)EDTA could be effectively reduced by the mixed in recent years (Du et al, 2011). Traditional treatments for NO x removal have been successfully developed (Jin et al, 2005).…”

Section: Evaluation Of a Newly Isolated Klebsiella Sp Dl-1 And Its Imentioning

confidence: 99%

Evaluation of a newly isolated Klebsiella sp. DL-1 and its interaction with Klebsiella sp. FD-3 in regenerating nitrogen oxide scrubbing liquor using ethylenediaminetetraacetic acid iron(II) as absorbent

Liu

Jing

et al. 2015

Environmental Nanotechnology, Monitoring & Management

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Evaluation of a newly isolated Klebsiella sp.DL-1 and its interaction with Klebsiella sp.FD-3 in regenerating nitrogen oxide scrubbing liquor using ethylenediaminetetraacetic acid iron(II) as absorbent, Environmental Nanotechnology, Monitoring and Management http://dx. HighlightsA new Klebsiella sp. strain (DL-1) was isolated for Fe(II)EDTA-NO reduction.DL-1 was efficient in denitrifying, and the reduction rate was 4.29 mmol·gDCW -1 ·h -1 .The interaction of DL-1 and FD-3 in the NO x removal system was investigated.DL-1 inhibited Fe(III)EDTA reduction, while FD-3 promoted Fe(II)EDTA-NO reduction.Fe(II)EDTA-NO and Fe(III)EDTA could be effectively reduced by the mixed Abstract A highly effective strain, referred to as DL-1 and identified as Klebsiella sp., was applied to Fe(II)EDTA-NO reduction. The average reduction rate was approximately 4.29 mmol·g DCW -1 ·h -1 , which was higher than those reported in the literature. The relationship between cell growth and Fe(II)EDTA-NO reduction was characterized, and a model was developed based on a logistic equation. To ensure that the simultaneous reduction of Fe(II)EDTA-NO and Fe(III)EDTA was feasible in the integrated NOx removal process of chemical absorption and biological reduction, DL-1 was mixed with a Fe(III)EDTA-reducing bacterium FD-3 to regenerate the scrubbing liquor. There was carbon and nitrogen source competition between these two strains in the mixed system. DL-1 was incapable of reducing Fe(III)EDTA, but FD-3 was capable of reducing Fe(II)EDTA-NO. Therefore, DL-1 would inhibit Fe(III)EDTA reduction, and FD-3 would enhance Fe(II)EDTA-NO reduction. The performance of the mixed strains was also investigated. The system could maintain stable and high reduction efficiencies, after 7 hours, the reduction efficiency of Fe(II)EDTA-NO and Fe(III)EDTA were 84.9% and 77.1% respectively.

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Experimental Investigation on the Kinetics of NO Complex Absorption through Fe^IIEDTA Solvent in a Double-Stirred Reactor

Cited by 21 publications

References 27 publications

Performance of Several Cobalt–Amine Denitration Solutions and Their Catalytic Regeneration by Graphene

Performance of Several Cobalt–Amine Denitration Solutions and Their Catalytic Regeneration by Graphene

On the Kinetics of the Absorption of Nitric Oxide into Ammoniacal Cobalt(II) Solutions

Evaluation of a newly isolated Klebsiella sp. DL-1 and its interaction with Klebsiella sp. FD-3 in regenerating nitrogen oxide scrubbing liquor using ethylenediaminetetraacetic acid iron(II) as absorbent

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Experimental Investigation on the Kinetics of NO Complex Absorption through FeIIEDTA Solvent in a Double-Stirred Reactor

Cited by 21 publications

References 27 publications

Performance of Several Cobalt–Amine Denitration Solutions and Their Catalytic Regeneration by Graphene

Performance of Several Cobalt–Amine Denitration Solutions and Their Catalytic Regeneration by Graphene

On the Kinetics of the Absorption of Nitric Oxide into Ammoniacal Cobalt(II) Solutions

Evaluation of a newly isolated Klebsiella sp. DL-1 and its interaction with Klebsiella sp. FD-3 in regenerating nitrogen oxide scrubbing liquor using ethylenediaminetetraacetic acid iron(II) as absorbent

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Experimental Investigation on the Kinetics of NO Complex Absorption through Fe^IIEDTA Solvent in a Double-Stirred Reactor