Reduction of [Fe(III)EDTA]<sup>−</sup> catalyzed by activated carbon modified with ammonia solution

Long, Xiang‐li; Yang, Lin; Chou, Xue-wei; Li, Cong; Wang, Yuan

doi:10.1002/ep.11758

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…It can be seen from the Figures 3-5 that the reaction order of NO was 1.5, 1.8, 0.2 in the quick-reaction zone, transition zone and slow-reaction zone, respectively. The proposed mechanism could be that in the dual oxidant (H 2 may almost translate into OH• by OH -, OH• was the dominant active radical at the inflexion point. In the slow-reaction zone, the quenching reactions of these free radicals in the dual oxidant (H 2 O 2 /S 2 O 22 8 ) system may become significant, leading to a decrease in NO reaction rate.…”

Section: No Reaction Ordermentioning

confidence: 99%

“…Nitrogen oxides and sulfur oxides emitted from coal‐fired power plants, not only can cause a series of air pollution problems such as acid rain and photochemical smog, but also are the main precursors of haze weather . At present, in the countries of China, the United States and Japan, the wet flue gas desulfurization and selective catalytic reduction combination technology (WFGD‐SCR) has been widely applied in the coal‐fired power plants to achieve the simultaneously desulfurization and denitration.…”

Section: Introductionmentioning

confidence: 99%

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Reaction performance study on denitration in aqueous solution of the dual oxidant (H₂O₂/S₂)

Wang

2016

Env Prog and Sustain Energy

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The reaction performance study on NO removal by using the dual oxidant (H 2 O 2 /S 2 O 22 8 ) solution was carried out in self-designed bubbling reactor. The experimental results showed that NO removal efficiency was up to 92.9% at pH 11. The results of the thermodynamics calculation verified that NO removal by using strong alkaline dual oxidant (H 2 O 2 /S 2 O 22 8 ) solution was feasible. The results of the kinetic study showed that the reaction between NO and dual oxidant (H 2 O 2 /S 2 O 22 8 ) in strong alkaline condition was found to be 1.5-order with respect to NO, and the average activation energy of this reaction was 26.32 kJ mol 21 in the quickreaction zone. The ion chromatography (IC) analysis results in strong alkaline condition showed that NO 2 3 and SO 22 4 were the final ionic product in spent reaction solution. This dual oxidant (H 2 O 2 /S 2 O 22 8 ) was a promising oxidant for the simultaneous wet removal of NO and SO 2 with high efficiency, no secondary pollution and low cost.

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Section: No Reaction Ordermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reaction performance study on denitration in aqueous solution of the dual oxidant (H₂O₂/S₂)

Wang

2016

Env Prog and Sustain Energy

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“…9−12 Alternatively, heterogeneous catalytic reduction has received increasing attention because of the superiority of high catalytic efficiency, few by-products, and recyclable ability. For example, Long et al 13,14 modified the activated carbon as the catalyst and used sulfite as the reducing agent to reduce Fe(III)EDTA. Xiang et al 15 applied selenium as the catalyst to reduce Fe(III)EDTA with the aid of sulfite.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the biological process has been reported to simultaneously reduce Fe(II)EDTA-NO and Fe(III)EDTA; nonetheless, the minor regeneration rate, complete equipment, and the long period required for complicated isolation and culture of bacteria bring about high operating costs. − Similarly, the easy oxidation nature of these reductive metals when exposed in air and unrecyclable properties after usage result in high material costs. − Alternatively, heterogeneous catalytic reduction has received increasing attention because of the superiority of high catalytic efficiency, few by-products, and recyclable ability. For example, Long et al , modified the activated carbon as the catalyst and used sulfite as the reducing agent to reduce Fe(III)EDTA. Xiang et al applied selenium as the catalyst to reduce Fe(III)EDTA with the aid of sulfite.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Heterogeneous Catalytic Reduction of Fe(II)EDTA-NO in Industrial Denitrification Solution over Pd/AC Catalyst

Chang

Liu

et al. 2019

Ind. Eng. Chem. Res.

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Fe(II)EDTA-based liquid-phase denitrification has been demonstrated as a very promising research direction in controlling NO x emission. However, a highly efficient method for simultaneous conversion of Fe(II)EDTA-NO and Fe(III)EDTA in industrial denitrification solution is currently imperative yet with great challenges. In this work, the commercial Pd/AC catalyst was first employed to realize the simultaneous deoxidization of Fe(II)EDTA-NO and Fe(III)EDTA by adopting sodium formate as the indirect hydrogen source. The effects of initial solution pH, reaction temperature, catalyst dosage, and sodium formate dosage on Fe(II)EDTA-NO reduction were systematically scrutinized. An excellent catalytic performance with 95% conversion of Fe(II)EDTA-NO, 81% reduction rate of Fe(III)EDTA, and 100% denitrification rate belonging to regenerated solution could be restored under the optimum conditions (pH ≈ 6, reaction temperature at 60 °C, 1.5 g/L Pd/AC catalyst, and 10 g/L sodium formate). Furthermore, it provides valuable guidance for the regeneration technology of Fe(II)EDTA complex solution.

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“…Some agents such as the dithionite ion (S 2 O 4 2– ), hydrazine (N 2 H 4 ), polyphenolic compound, and a chemical absorption–biological reduction (BioDENO x ) − were found to be efficient reducing agents of the ferric ion in [Fe III (edta)(H 2 O] − at ambient temperature. Activated carbon − also acts as an effective reduction agent in this system. At present, only the sulfite ion − has been widely examined as a reducing agent to the ferrous ion in this system.…”

Section: Introductionmentioning

confidence: 99%

Applied Kinetics Aspects of Ferric EDTA Complex Reduction with Metal Powder

Suchecki

Mathews

Augustyniak

et al. 2014

Ind. Eng. Chem. Res.

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Nitrogen and sulfur oxides (NO x and SO x ) emitted from fossil-fuel-fired facilities can be simultaneously absorbed into aqueous mixed solutions of sulfite and Fe II L, a ferrous ion coordinated to a ligand L (a chelate compound). Usually, the ligand L represents an anion of ethylenediaminetetraacetic acid (EDTA or edta). Nitrogen oxide (NO) sparingly soluble in water is promptly bound to the [Fe II (edta)(H 2 O)] 2− complex to form the [Fe II (edta)(NO] 2− compound. However, [Fe II (edta)(H 2 O] 2− chelate is oxidized to form [Fe III (edta)(H 2 O)] − by NO, NO 2 , and O 2 , normally coexisting in flue gases.Because the ferric complex does not react with NO, the suppression of these undesired oxidation processes is a very important technological problem to be overcome. Thus, in this work, the reduction kinetics of ferric ion by metal was discussed on the basis of the kinetic data regarding the ferric ion reduction in aqueous solutions of [Fe III (edta)(H 2 O)] − containing such pulverized metals as aluminum, tin, and zinc. The rate expression for the reduction of [Fe III (edta)(H 2 O] − by a metal powder was derived in terms of the rate-determining step approximation method. Laboratory-scale experiments were conducted in a recirculation-type glass reactor filled with 250 cm 3 of solution. The influence of the following parameters on the reduction rate was investigated: (1) [Fe III (edta)(H 2 O)] 0 − = 0.100−0.010 M, (2) [metal] 0 /[Fe III (edta)(H 2 O)] 0 − = 10−100, (3) pH 0 = 3−9, and (4) temperature = 20−80°C. Zinc and aluminum powders were found to be effective reducing agents for ferric ions coordinated to EDTA. Similar experiments were carried out using a working solution in a simultaneous NO and SO 2 removal process as a solvent of [Fe III (edta)(H 2 O)] − solution.

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Reduction of [Fe(III)EDTA]⁻ catalyzed by activated carbon modified with ammonia solution

Cited by 9 publications

References 31 publications

Reaction performance study on denitration in aqueous solution of the dual oxidant (H₂O₂/S₂)

Reaction performance study on denitration in aqueous solution of the dual oxidant (H₂O₂/S₂)

Highly Efficient Heterogeneous Catalytic Reduction of Fe(II)EDTA-NO in Industrial Denitrification Solution over Pd/AC Catalyst

Applied Kinetics Aspects of Ferric EDTA Complex Reduction with Metal Powder

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Reduction of [Fe(III)EDTA]− catalyzed by activated carbon modified with ammonia solution

Cited by 9 publications

References 31 publications

Reaction performance study on denitration in aqueous solution of the dual oxidant (H2O2/S2)

Reaction performance study on denitration in aqueous solution of the dual oxidant (H2O2/S2)

Highly Efficient Heterogeneous Catalytic Reduction of Fe(II)EDTA-NO in Industrial Denitrification Solution over Pd/AC Catalyst

Applied Kinetics Aspects of Ferric EDTA Complex Reduction with Metal Powder

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Reduction of [Fe(III)EDTA]⁻ catalyzed by activated carbon modified with ammonia solution

Reaction performance study on denitration in aqueous solution of the dual oxidant (H₂O₂/S₂)

Reaction performance study on denitration in aqueous solution of the dual oxidant (H₂O₂/S₂)