Study on the removal of nitric oxide (NO) by dual oxidant (H2O2/S2O82−) system

Wang, Zhiping; Wang, Zuwu; Ye, Yin; Chen, Na; Li, Haiwei

doi:10.1016/j.ces.2016.02.018

Cited by 48 publications

(30 citation statements)

References 34 publications

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“…Based on the literature and on our previous works [12,20,22,23], NaClO 2 , KMnO 4 , and Na 2 S 2 O 8 were considered as better NO oxidants. Thus, in this study, the contrast experiments for different oxidants on SO 2 and NO x removal were investigated, and the results are displayed in Figures 2 and 3.…”

Section: Simultaneous Removal Of So 2 and No X With Different Oxidantmentioning

confidence: 99%

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

et al. 2018

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In this work, the feasibility of the simultaneous removal of NOx and SO2 through a simple process using a composite absorbent (NaClO2/Na2S2O8) was evaluated. Factors affecting the removal of NOx and SO2, such as NaClO2 and Na2S2O8 concentrations, solution temperature, the initial pH of solution, gas flow rate, and SO2, NO, and O2 concentrations were studied, with a special attention to NOx removal. Results indicate that a synergistic effect on NOx removal has been obtained through combination of NaClO2 and Na2S2O8. NaClO2 in the solution played a more important role than did Na2S2O8 for the removal of NOx. The above factors had an important impact on the removal of NOx, especially the solution temperature, the initial pH of the solution, and the oxidant concentrations. The optimum experimental conditions were established, and a highest efficiency of NOx removal of more than 80% was obtained. Meanwhile, tandem double column absorption experiments were conducted, and a NOx removal efficiency of more than 90% was reached, using NaOH solution as an absorbant in the second reactor. A preliminary reaction mechanism for NOx and SO2 removal was deduced, based on experimental results. The composite absorbent has the potential to be used in the wet desulfurization and denitration process, to realize the synergistic removal of multi-pollutants.

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Section: Simultaneous Removal Of So 2 and No X With Different Oxidantmentioning

confidence: 99%

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

et al. 2018

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“…That was because active chlorine species in NaClO solution were mainly HClO and Cl 2 at pH 4, as shown in Figure 4. During the scrubbing process, Cl 2 would be purged out easily from the solution and reacted with NO effectively in gas phase as (14) and (15) [25]. The decrease of Cl 2 in NaClO solution would lead to a left shift of the hydrolysis equilibrium of active chlorine as shown in (16), resulting in the increase of solution pH for NaClO solution with initial pH 4.…”

Section: Effect Ofmentioning

confidence: 99%

“…Another feasible approach is to add the oxidants into the absorbent. For this purpose, various oxidants such as hydrogen peroxide (H 2 O 2 ) [13][14][15], potassium permanganate (KMnO 4 ) [16], sodium chlorite (NaClO 2 ) [17,18], calcium hypochlorite (Ca(ClO) 2 ) [19], and sodium hypochlorite (NaClO) [20][21][22][23][24] have been investigated to enhance the NO removal efficiency of the scrubbing solution. Compared with other oxidants, NaClO has some distinct advantages, such as low cost, easy availability, strong oxidative ability, easy to storage, good stability, and low toxicity.…”

Section: Introductionmentioning

confidence: 99%

NO_xRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

Han

Liu

Yang

et al. 2017

Journal of Chemistry

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The experiments were performed in a lab-scale countercurrent spraying reactor to study the NOxremoval from simulated gas stream by cyclic scrubbing using NaClO solution. The effects of NaClO concentration, initial solution pH, coexisting gases (5% CO2and 13% O2), NOxconcentration, SO2concentration, and absorbent temperature on NOxremoval efficiency were investigated in regard to marine exhaust gas. When NaClO concentration was higher than 0.05 M and initial solution pH was below 8, NOxremoval efficiency was relatively stable and it was higher than 60%. The coexisting CO2(5%) had little effect on NOxremoval efficiency, but the outlet CO2concentration decreased slowly with the initial pH increasing from 6 to 8. A complete removal of SO2and NO could be achieved simultaneously at 293 K, initial pH of 6, and NaClO concentration of 0.05 M, while the outlet NO2concentration increased slightly with the increase of inlet SO2concentration. NOxremoval efficiency increased slightly with the increase of absorbent temperature. The relevant reaction mechanisms for the oxidation and absorption of NO with NaClO were also discussed. The results indicated that it was of great potential for NOxremoval from marine exhaust gas by wet scrubbing using NaClO solution.

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“…The low solubility of NO is the main obstacle for aqueous absorption of NOx because NO generally occupies 95% NOx in flue gas. As a result, the uses of aqueous solutions of H 2 O 2 , NaClO 2 , KMnO 4 , sodium persulfate, and sonochemical oxidation processes to turn NO into soluble NO 2 , are the subjects of many studies [3][4][5][6][7][8][9][10][11][12][13][14]. However, none of these methods have been put into commercial application.…”

Section: Introductionmentioning

confidence: 99%

Effect of treatment with tartaric acid on carbon as a catalyst in the absorption of NO into the hexamminecobalt(II) solution

Long

Jia

et al. 2017

Env Prog and Sustain Energy

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Tartaric acid solution is applied to change the surface characteristics of activated carbon to improve its catalytic capability in the regeneration of Co(NH3)62+ that is used to realize the simultaneous removal of NO and SO2. The experimental results show that the best treatment condition is impregnating the carbon samples in 1.5 mol l−1 tartaric acid solution for 18 h followed by being activated at 400°C for 4 h under nitrogen atmosphere. After being treated with tartaric acid solution, the surface area of activated carbon and the acidity on its surface increase. The experiments show that the modified carbon can obtain a much higher NO removal efficiency than the original carbon. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 333–341, 2018

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Study on the removal of nitric oxide (NO) by dual oxidant (H2O2/S2O82−) system

Cited by 48 publications

References 34 publications

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

NO_xRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

Effect of treatment with tartaric acid on carbon as a catalyst in the absorption of NO into the hexamminecobalt(II) solution

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Study on the removal of nitric oxide (NO) by dual oxidant (H2O2/S2O82−) system

Cited by 48 publications

References 34 publications

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

NOxRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

Effect of treatment with tartaric acid on carbon as a catalyst in the absorption of NO into the hexamminecobalt(II) solution

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NO_xRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution