Use of cobalt(II) chelates of monothiol-containing ligands for the removal of nitric oxide

Jiang, Wei; Xu, Qiang; Wei, Xionghui

doi:10.1016/j.jhazmat.2019.04.025

Cited by 18 publications

(13 citation statements)

References 30 publications

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“…Therefore, substituents (−CH 3 , −COOH, −(CH 2 ) 4 −) on the carbon atoms of ligands lead to a decrease in denitration efficiency. This phenomenon is inconsistent with the results reported in the literature, as it has been proved that the electron effect of groups contributes to denitration. Therefore, this may be related to the steric hindrance caused by the substituents on the carbon skeleton of ligands.…”

Section: Results and Discussioncontrasting

confidence: 99%

“…The denitration process was studied with a lab-scale gas scrubber following a procedure described previously. 21 Detailed conditions such as gas flow, temperature, parameters of the scrubber, amount of absorbent, and so forth are the same as in the literature. Denitration efficiency (η) and the amount of NO absorbed were obtained by using the same data processing methods.…”

Section: Methodsmentioning

confidence: 99%

“…Denitration efficiency (η) and the amount of NO absorbed were obtained by using the same data processing methods. 21 2.3. Regeneration Experiments and Characterization of Graphene.…”

Section: Methodsmentioning

confidence: 99%

“…However, amine ligands suitable for cobalt are currently limited and require screening and expansion . It has been found that the substituents on −SH ligands strongly influence the denitration effect; therefore, it is also of interest to study −NH 2 ligands with substituted groups.…”

Section: Introductionmentioning

confidence: 99%

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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 Discussioncontrasting

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Denitration efficiency (η) and the amount of NO absorbed were obtained by using the same data processing methods. 21 2.3. Regeneration Experiments and Characterization of Graphene.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Jiang

Wei

2019

Environ. Sci. Technol.

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“…Some of the popular methods for the denitrification of exhaust gases include selective catalytic and noncatalytic reduction, adsorption-based methods, and plasma-based methods [13,14]. Apart from wet denitration, several new technologies have been developed, such as complexation absorption, oxidation absorption, reduction absorption, and biological methods [15][16][17][18][19][20]. Among these methods, the complexation absorption method is considered as one of the most promising technologies for efficient wet denitrification [18][19][20].…”

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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Effect of the oxidation of activated carbon by hydrogen peroxide on its catalytic activity in the regeneration of Co(II)TETA

Chen

Long

2023

Can J Chem Eng

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Cobalt(II) triethylenetetramine (Co(II)TETA) formed by soluble cobalt(II) salt combining with triethylenetetramine will be used as a wet denitration technique since it can interact with nitric oxide to accomplish quick absorption of NO from gas phase. However, the oxygen in the flue gas will oxidize Co(II)TETA to Co(III) TETA, resulting in the reduction of denitrification efficiency. Activated carbon has been used to promote the regeneration of Co(II)TETA due to its unique surface characteristics. Hydrogen peroxide solution is utilized as a modifier in the carbon modification to improve the catalytic performance of activated carbon. The experiments demonstrate that the best regeneration efficiency of Co(II)TETA is gained by the modified carbon impregnated in 0.05 mol L−1 H2O2 solution at 70°C for 12 h with a solid/liquid ratio of 1/50 (g/mL) followed being activated at 400°C for 2 h in N2. After being treated with hydrogen oxide solution, the surface area and acidity of the carbon is increased. Continuous experiments reveal that the NO removal efficiency gained by modified activated carbon is about 8.36% higher than that gained by the original carbon.

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Use of cobalt(II) chelates of monothiol-containing ligands for the removal of nitric oxide

Cited by 18 publications

References 30 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

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

Effect of the oxidation of activated carbon by hydrogen peroxide on its catalytic activity in the regeneration of Co(II)TETA

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Use of cobalt(II) chelates of monothiol-containing ligands for the removal of nitric oxide

Cited by 18 publications

References 30 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

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

Effect of the oxidation of activated carbon by hydrogen peroxide on its catalytic activity in the regeneration of Co(II)TETA

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