Study on NO2 absorption by ascorbic acid and various chemicals

Li, Wei; Fang, He-liang; Shi, Yao; Lei, Lecheng

doi:10.1631/jzus.2006.b0038

Cited by 3 publications

(4 citation statements)

References 14 publications

(11 reference statements)

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“…For a given energy density of around 1000 J/L, the NO x removal (NO oxidation) efficiencies are 90.2% (100%), 87% (97%), and 80% (91%) at pH of 7.5, 4, and 2, respectively. This is because the ratio of SO 3 2– conversion to HSO 3 – increases with the decrease of pH, and the reaction rate constant of NO 2 and SO 3 2– (1.12 × 10 6 mol/(L·s)) is 2 orders of magnitude larger than that of NO 2 and HSO 3 – (2.8 × 10 4 mol/(L·s)) …”

Section: Results and Discussionmentioning

confidence: 99%

“…This is because the ratio of SO 3 2− conversion to HSO 3 − increases with the decrease of pH, and the reaction rate constant of NO 2 and SO 3 2− (1.12 × 10 6 mol/(L•s)) is 2 orders of magnitude larger than that of NO 2 and HSO 3 − (2.8 × 10 4 mol/(L•s)). 16 However, the accumulated NO 2 − produced via eq R16 in the mist may be decomposed according to a disproportionation reaction as follows: 1…”

Section: Energy and Fuelsmentioning

confidence: 99%

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Removal of NO in Mist by the Combination of Plasma Oxidation and Chemical Absorption

Xie

Zhu

et al. 2016

Energy Fuels

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A coaxial nonthermal plasma (NTP) reactor was used for oxidizing and removing NO in mist. The effects of gas/mist components on O3 formation, NO oxidation, and NO x removal by NTP in simulated flue gas after wet desulfurization were investigated. The presence of mist results in the significant decrease of O3 concentration. Formation of active species, such as OH and HO2, would promote the reactions between NO and OH/HO2. Thus, the NO oxidation, NO x removal, and energy efficiency are significantly improved in the presence of mist. The promotion effects of mist component on the NO oxidation and NO x removal follow the order: Na2SO3 mist > FeSO4 mist > Na2SO4 mist. Increase of the mist pH can enhance the absorption of nitrogen oxides with the mist. Adding SO2 to the gas mixtures or raising the NO2/NO x ratio of simulated gas increases the NO x removal efficiency. This process demonstrates that NO oxidation by NTP and subsequently absorption by mist are feasible and have great value to practical application.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Energy and Fuelsmentioning

confidence: 99%

Removal of NO in Mist by the Combination of Plasma Oxidation and Chemical Absorption

Xie

Zhu

et al. 2016

Energy Fuels

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“…In some similar studies reported in the literature, the values of Ha are similar to those observed in this work. 27,36 However, the values of overall rate constant with various oxidants were evaluated by the principle of Danckwert's theory by Li et al 37 The overall order of reaction was reported as 1, whereas the overall rate constant was of the order of 10−6 mol•L −1 •s −1 at pH 5.4−6.5 at 328 K. The current study can be utilized for calculation of the kinetics and mass transfer parameters for the bubble column reactor. It was observed that the peroxone process is more efficient for the absorption of NO 2 at a wide range of pH and temperature.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Reaction Kinetics for Removal of NO_x by Ozone and Hydrogen Peroxide

Khuntia

Sinha

Mohan

2020

Ind. Eng. Chem. Res.

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In this article, the kinetics of the ozone and hydrogen peroxide-based NO2 removal from flue gas has been evaluated using the well-known two-film theory. The effectiveness of the rate of absorption of NO2 has been tested by the effect of pH, temperature, H2O2 concentration, and so forth. This study also includes the comparison of the Hatta number (Ha) at various experimental conditions. It was observed that the reaction of NO2 is first order in nature with both ozone and hydrogen peroxide. The effect of SO2 concentration on the absorption of NO2 was negligible. However, the absorption efficiency decreases in the presence of higher SO2 concentration in the peroxone process. The predicted model shows a good fit with the experimental results for various NO2 inlet concentrations. The optimum pH for NO2 absorption for ozonation and peroxone processes was 8. At 318 K, absorption of NO2 shows the maximum value for the ozonation process, whereas for the peroxone process, it was 328 K. The effect of H2O2 on the absorption of NO2 in the aqueous phase was prominent with high Ha values. It was observed that NO2 absorption increases rapidly when H2O2 concentration is increased from 0 to 0.3 mol·L–1. In the zone of 0.5–3.5 mol·L–1 H2O2 concentration, the rate of NO2 absorption was slow.

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“…The double-stirred reactor had a gas-liquid interface that was planar to a close approximation (22,23). The reactor was 61 mm in diameter and equipped with four vertical baffles and two stirring blades.…”

Section: Experiments On Toluene Absorptionmentioning

confidence: 99%

Solubilization Absorption of Toluene Vapor by Formation of Oil-in Water Microemulsions with Cation Surfactants

Jiang

Tian

Ning

et al. 2010

Separation Science and Technology

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Absorption reactors to remove volatile organic compounds from gas streams can be retrofitted, as volatile organic compounds act as oils and form microemulsions. Using the region of microemulsion in the phase diagram as the indicator, the main influences on the solubilization capacity of various microemulsion systems were investigated. When the mass ratio of the surfactant (cetyltrimethylammonium bromide) to the cosurfactant (tetrabutylammonium bromide) was 1:1, the microemulsion was the best absorbent. Comparative absorption tests of microemulsion, distilled water, and surfactants were performed in a double-stirred reactor. The results indicate that the microemulsion has a relatively higher absorption rate and absorption capacity than the other absorbents.

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Study on NO2 absorption by ascorbic acid and various chemicals

Cited by 3 publications

References 14 publications

Removal of NO in Mist by the Combination of Plasma Oxidation and Chemical Absorption

Removal of NO in Mist by the Combination of Plasma Oxidation and Chemical Absorption

Evaluation of Reaction Kinetics for Removal of NO_x by Ozone and Hydrogen Peroxide

Solubilization Absorption of Toluene Vapor by Formation of Oil-in Water Microemulsions with Cation Surfactants

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Study on NO2 absorption by ascorbic acid and various chemicals

Cited by 3 publications

References 14 publications

Removal of NO in Mist by the Combination of Plasma Oxidation and Chemical Absorption

Removal of NO in Mist by the Combination of Plasma Oxidation and Chemical Absorption

Evaluation of Reaction Kinetics for Removal of NOx by Ozone and Hydrogen Peroxide

Solubilization Absorption of Toluene Vapor by Formation of Oil-in Water Microemulsions with Cation Surfactants

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Evaluation of Reaction Kinetics for Removal of NO_x by Ozone and Hydrogen Peroxide