Removal of nitrogen oxide (NOx) and sulfur dioxide from flue gas using aqueous emulsions of yellow phosphorus and alkali

Liu, David K.; Shen, Di-Xin; Chang, Shuenn‐Yih

doi:10.1021/es00013a003

Cited by 33 publications

(22 citation statements)

References 8 publications

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“…[ 21 ] Nevertheless, the excessive solid‐liquid ratio results in lower denitration efficiency. It may be attributed to two aspects: more copper slag particles in the liquid‐phase contributed to the lowering fluidity of yellow phosphorus; and the high solid‐liquid ratio decreased the dissolved oxygen concentration, which is believed to react with yellow phosphorus, producing O 3 , [ 19 ] thus decreasing the interfacial area between NO and O 3 produced by P 4 . Thus, the effect of solid‐liquid ratio on NO x removal efficiency was discussed here.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous NO_x and SO₂ removal during wet flue gas desulfurization, using copper smelter slag slurry combined with yellow phorphorus

Bao

Xiao

et al. 2020

Can J Chem Eng

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The study of copper slag has attracted the attention of scholars from both China and around the world. But few have paid attention to its applications in the simultaneous removal of SO2 and NOx in wet flue gas desulfurization (WFGD), becasue WFGD technique is inappropriate for directly treating NOx owing to the low solubility of NO. This work aims to improve NOx removal efficiency in WFGD technology using copper slag slurry associated with the oxidation of NOx by yellow phosphorus. Different operating conditions, including dispersion of P4, solid‐liquid ratio, initial pH value of copper slag slurry, reaction temperature, oxygen content, and gas flow rate, were compared regarding the efficiency of SO2 and NOx simultaneous removal. The characterizations were carried out on the liquid and solid part of fresh and spent copper slag slurry after filtration. The results indicated that a great amount of metals ions, such as Fe3+ and Zn2+, were leached by reacting with produced acids (H2SO4, HNO3, and H3PO4), which had a liquid‐phase catalytic oxidation on SIV species (SO32−/HSO3−), leading to promotion in absorption for SO2. The copper slag played a significant role in dispersing the yellow phosphorus and promoting ozone generation, thus improving NOx removal efficiency. The reaction pathway can be divided into three parts: (a) ozone generation induced by yellow phosphorus, (b) the oxidation of NO by O3 and then dissolution in aqueous solution, and (c) the dissolution of SO2 and the liquid‐phase oxidation for SO2 through metal ions produced by the reaction between acid and copper slag.

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Section: Resultsmentioning

confidence: 99%

Simultaneous NO_x and SO₂ removal during wet flue gas desulfurization, using copper smelter slag slurry combined with yellow phorphorus

Bao

Xiao

et al. 2020

Can J Chem Eng

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“…In the past several decades, a number of additives were investigated for simultaneous removal of SO 2 and NOx. These additives could be divided into two types: metal chelates [3,4] and oxidative additives [5][6][7][8][9][10][11][12][13][14][15][16], and NaClO 2 has been found the most effective additives for SO 2 and NOx absorption.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous absorption of NOx and SO₂ in oxidant‐enhanced limestone slurry

Zheng

Gao

et al. 2013

Env Prog and Sustain Energy

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In this article, a study of simultaneous absorption kinetics of NOx and SO2 in oxidant‐enhanced limestone slurry using sodium chlorite as additives is presented. The laboratory‐scale experiments were performed in a double‐stirred tank reactor, and the effect of inorganic ions and operating parameters on absorption rates was investigated. The results indicate that NOx absorption rate shows a positive order with respect to NO (0.573), SO2 (0.278), and NaClO2 (0.194), whereas SO2 absorption rate shows a first order with respect to SO2 and zero order for both NO and NaClO2 under a typical limestone wet flue gas desulfurization operating condition. Higher pH leads to a decrease of NOx absorption rate but has no significant influence on SO2 absorption. The SO2 absorption rate decreases with the increase of temperature, whereas the NOx absorption rate remains nearly constant. S(IV) in the slurry reduces the NOx absorption rate dramatically and suppresses the SO2 absorption, whereas the presence of nitrate ions can increase the absorption rate of both SO2 and NOx. High concentration of Cl− has a positive effect on the SO2 absorption, whereas it has a negative effect on NOx absorption rate. Additionally, Mg2+ and F− have no impact on SO2 and NOx absorption rates. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 1171–1179, 2014

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“…There have been several liquid absorbents that have been investigated to determine their effectiveness on the removal of NO [5][6][7][8][9][10]. Among them, NaClO 2 shows high absorption rates, and its wastewater is relatively easier to handle, e.g., by simply adjusting its pH and COD values.…”

Section: Introductionmentioning

confidence: 99%

Removal of NO from flue gas by wet scrubbing with NaClO2/(NH2)2CO solutions

Jiang

Luo

et al. 2009

Journal of Industrial and Engineering Chemistry

100

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Removal of nitrogen oxide (NOx) and sulfur dioxide from flue gas using aqueous emulsions of yellow phosphorus and alkali

Cited by 33 publications

References 8 publications

Simultaneous NO_x and SO₂ removal during wet flue gas desulfurization, using copper smelter slag slurry combined with yellow phorphorus

Simultaneous NO_x and SO₂ removal during wet flue gas desulfurization, using copper smelter slag slurry combined with yellow phorphorus

Simultaneous absorption of NOx and SO₂ in oxidant‐enhanced limestone slurry

Removal of NO from flue gas by wet scrubbing with NaClO2/(NH2)2CO solutions

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Removal of nitrogen oxide (NOx) and sulfur dioxide from flue gas using aqueous emulsions of yellow phosphorus and alkali

Cited by 33 publications

References 8 publications

Simultaneous NOx and SO2 removal during wet flue gas desulfurization, using copper smelter slag slurry combined with yellow phorphorus

Simultaneous NOx and SO2 removal during wet flue gas desulfurization, using copper smelter slag slurry combined with yellow phorphorus

Simultaneous absorption of NOx and SO2 in oxidant‐enhanced limestone slurry

Removal of NO from flue gas by wet scrubbing with NaClO2/(NH2)2CO solutions

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Product

Resources

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Simultaneous NO_x and SO₂ removal during wet flue gas desulfurization, using copper smelter slag slurry combined with yellow phorphorus

Simultaneous NO_x and SO₂ removal during wet flue gas desulfurization, using copper smelter slag slurry combined with yellow phorphorus

Simultaneous absorption of NOx and SO₂ in oxidant‐enhanced limestone slurry