Nitric oxide absorption into cobalt ethylenediamine solution

Long, Xiang‐li; Xin, Zhiling; Chen, Mao-bing; Xiao, Wen‐De; Wang, Yuan

doi:10.1016/j.seppur.2006.12.018

Cited by 16 publications

(4 citation statements)

References 33 publications

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“…It is shown that metal chelates can bind NO to form metal nitrosyl chelates. Therefore, the use of metal chelate additives in wet flue gas denitrification systems has been widely reported (9)(10)(11)(12)(13)(14)(15).…”

Section: Removal Of Dilute Nitric Oxide Using Cobalt Diethylenetriamimentioning

confidence: 99%

Removal of Dilute Nitric Oxide using Cobalt Diethylenetriamine Solution under Aerobic Condition

Jiang

Cai

et al. 2009

Separation Science and Technology

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A novel process has been developed to remove NO from flue gas using a basic solution of cobalt(II) diethylenetriamine. The cobalt(II) diethylenetriamine cation can not only bind NO but also activate oxygen in aqueous solution. When only cobalt(II) diethylenetriamine solution was used, NO was oxidized to soluble nitrite and nitrate by active oxygen. So O 2 in the gas phase is favorable for the absorption of NO as O 2 concentration is less than 6%. When hydrazine hydrate were added to the solution, NO was reduced to N 2 and almost no nitrate was found in the spent scrubbing liquor. O 2 reacted with active Co II to inactive Co III . Thus the removal efficiency of NO decreased with increasing O 2 concentration. The effects of liquid-to-gas ratio, cobalt(II) diethylenetriamine, ðNH 2 Þ 2 Á H 2 O concentration, and temperature on NO removal efficiency were also examined under aerobic condition. Results showed that cobalt(II) diethylenetriamine was a promising metal chelate for NO removal.

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Section: Removal Of Dilute Nitric Oxide Using Cobalt Diethylenetriamimentioning

confidence: 99%

Removal of Dilute Nitric Oxide using Cobalt Diethylenetriamine Solution under Aerobic Condition

Jiang

Cai

et al. 2009

Separation Science and Technology

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“…Cobalt ethylenediamine solution combined with CaO, NaOH solution, ammonia solution, and calcium carbide slag, respectively, resulted in NO removal rates of 90 %, 76.6 %, 93.5 %, and 92.8 %, after continuous operation for 1 h [28,29]. Long et al found that under sufficient oxygen conditions the removal rate of NO by cobalt ethylenediamine can reach 90 % [30]. They also confirmed that the gasliquid reaction becomes gas-film controlling when cobalt ethylenediamine was applied to remove NO [31].…”

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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“…Other alternatives to remove NO were also investigated, such as absorption 14,15 . In this case, the absorption capacity of NO in aqueous solutions is reported to be low 15 .…”

Section: Introductionmentioning

confidence: 99%

“…Other alternatives to remove NO were also investigated, such as absorption. , In this case, the absorption capacity of NO in aqueous solutions is reported to be low . For these reasons, big efforts have been tried to enhancing this absorption capacity by using additives .…”

Section: Introductionmentioning

confidence: 99%

Methanol-Promoted Oxidation of Nitrogen Oxide (NO_x) by Encapsulated Ionic Liquids

Santiago

Mossin

Bedia

et al. 2019

Environ. Sci. Technol.

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The removal of nitrogen oxides (NO x) has been extensively studied due to their harmful effects to health and environment. In this work, Encapsulated Ionic Liquids (ENILs) are used as catalysts for the NO oxidation at humid conditions and low temperatures. Hollow carbon capsules (C Cap) were first synthetized to contain different amounts of 1-butyl-3-methylimidazolium nitrate IL ([bmim][NO 3 ]), responsible for the catalytic oxidation. Then, the materials were characterized using different techniques, by analyzing microstructure, porosity, elemental composition and thermal stability. The catalytic performance of ENIL materials was tested for NO conversion at different conditions. Thus, NO concentration was fixed at 2,000 ppm at dry and humid conditions. Then, the methanol promotion of the reaction was demonstrated, increasing the NO conversion values in all cases, and the alcohol/water ratio was optimized. The temperature effect was studied as well, using the optimal conditions based on the previous measurements. The results reflect that humid conditions do not have a negative effect in terms of NO conversion when using ENILs, opposite behavior as the observed for C Cap and traditional catalysts studied before. Low amount of IL inside the material (40% in mass) was found to be the optimum for the task, reaching conversions of almost 45% in near industrial conditions of temperature and O 2 and H 2 O concentrations in the flue gas with a GHSV = 10,000 h-1 .

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Nitric oxide absorption into cobalt ethylenediamine solution

Cited by 16 publications

References 33 publications

Removal of Dilute Nitric Oxide using Cobalt Diethylenetriamine Solution under Aerobic Condition

Removal of Dilute Nitric Oxide using Cobalt Diethylenetriamine Solution under Aerobic Condition

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

Methanol-Promoted Oxidation of Nitrogen Oxide (NO_x) by Encapsulated Ionic Liquids

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Nitric oxide absorption into cobalt ethylenediamine solution

Cited by 16 publications

References 33 publications

Removal of Dilute Nitric Oxide using Cobalt Diethylenetriamine Solution under Aerobic Condition

Removal of Dilute Nitric Oxide using Cobalt Diethylenetriamine Solution under Aerobic Condition

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

Methanol-Promoted Oxidation of Nitrogen Oxide (NOx) by Encapsulated Ionic Liquids

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Product

Resources

About

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

Methanol-Promoted Oxidation of Nitrogen Oxide (NO_x) by Encapsulated Ionic Liquids