Integrative process of preoxidation and absorption for simultaneous removal of SO2, NO and Hg0

Zhao, Yi; Hao, Runlong; Qi, Meng

doi:10.1016/j.cej.2015.01.064

Cited by 89 publications

(41 citation statements)

References 42 publications

(88 reference statements)

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“…After the pre-oxidation by CO and absorption by Ca(OH) 2 scrubber, the residual Hg 2+ and almost all of Hg 0 in flue gas was absorbed by KCl and HK solutions respectively, based on Table S1, it was calculated that there were 22.4 ng of Hg 2+ and 187 ng of Hg 0 were presented in the KCl and HK solutions. Thereby the fate of Hg 0 can be summarized as the followed three primary pathways: (1) 3155.6 ng of Hg 2+ accounted for 99.3% (w/w) of total oxidized mercury is absorbed by Ca(OH) 2 solution, which is consistent with the result of our previous work [24], indicating that Ca(OH) 2 is an excellent absorbent for Hg 2+ removal; (2) the other 22.4 ng of Hg 2+ , 0.7% (w/w) of total oxidized mercury, is absorbed by KCl solution; (3) 187 ng of the unreacted Hg 0 is absorbed by HK solution. The XPS characterization was performed to determine the oxidation states of the deposited mercury species.…”

Section: Reaction Mechanismsupporting

confidence: 89%

“…9. In our previous work [24], the better removal of NO and Hg 0 of 91% and 93% was obtained by using NaClO 2 /NaBr. However, its cost was 3 times higher than that of H 2 O 2 /NaClO 2 proposed in the paper.…”

Section: Effects Of Coexistence Gases On the Simultaneous Removalmentioning

confidence: 94%

“…Importantly, they have great influences on the Hg 0 removal [19][20][21][22][23][24], so a series of experiments with different concentrations of NO and SO 2 were carried out.…”

Section: Effects Of Coexistence Gases On the Simultaneous Removalmentioning

confidence: 99%

See 2 more Smart Citations

Simultaneous removal of SO 2 , NO and Hg 0 through an integrative process utilizing a cost-effective complex oxidant

Zhao

Hao

Yuan

et al. 2016

Journal of Hazardous Materials

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112

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Section: Reaction Mechanismsupporting

confidence: 89%

Section: Effects Of Coexistence Gases On the Simultaneous Removalmentioning

confidence: 94%

See 1 more Smart Citation

Simultaneous removal of SO 2 , NO and Hg 0 through an integrative process utilizing a cost-effective complex oxidant

Zhao

Hao

Yuan

et al. 2016

Journal of Hazardous Materials

Self Cite

112

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“…In the research of Zhao et al [13] , NaClO+NaClO 2 oxidant was used to investigated simultaneous removal of SO 2 and NO from fuel gas, under the optimal conditions, the removal efficiency of SO 2 and NO reached 100% and 85% respectively. In NaClO 2 [14] . Hao et al [15] proposed a novel complex oxidant NaClO 2 /Na 2 S 2 O 8 , the system could convert NO and SO 2 into NO 2 -, NO 3 -and SO 4 2-with the efficiency of 87.2% and 100%.…”

Section: Introductionmentioning

confidence: 99%

Emission characteristics of Cl₂ and ClO₂ during simultaneous removal of SO₂ and NO using NaClO₂ solution

Tang

Fang

Huang

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. In this study, an experimental apparatus of oxidation + absorption columns was set up to investigated ClO 2 and Cl 2 emission characteristics when NaClO 2 was used as oxidant. Two sets of experiments were designed and compared, one was sampled every 15 min for 2 h and the other one was continuous sampling for 2 h. The results show that the concentration of ClO 2 in the outlet of oxidation column increased first and then decreased while Cl 2 barely changed during the experiment. The concentration of Cl 2 was far less than ClO 2 , which indicated that the chlorine-containing gaseous component was mainly in the form of ClO 2 . After 2 h reaction, the chlorine-containing ions in oxidation liquid before and after reaction were in good consistence with the theoretical calculation. High concentration of Cl -was detected in the absorption liquid, while no ClO 2 -and ClO 3 -existed. As the reaction proceeded, the oxidation liquid gradually turned into light yellow, and pungent odor released.

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“…The integrated oxidation-absorption process using chemical reagents for simultaneous removal of NO x and SO 2 is considered as a cost-effective and environmental friendly technology for flue gas treatment and has gained increasing interest [4]. However, nitric oxide (NO), accounting for more than 95% of NO x in typical flue gas, is almost insoluble and low active.…”

Section: Introductionmentioning

confidence: 99%

The Chemical Behaviors of Nitrogen Dioxide Absorption in Sulfite Solution

Hong

Zhu

et al. 2017

Applied Sciences

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Abstract:The simultaneous removal of nitrogen oxides (NO x ) and sulfur dioxide (SO 2 ) by absorption is considered to be one of the most promising technologies for flue gas treatment, and sulfite is the main component of the absorption solution. To understand the chemical behaviors of the NO 2 absorption in sulfite solution, the absorption time dependences of concentrations of nitrogen and sulfur compositions in both gas phase and liquid phases were investigated by flue gas analyzer, Ion chromatography (IC), Gas chromatography (GC), and Fourier transform infrared spectrometry (FTIR) methods using a bubbling reactor. The mass equilibrium of the N and S compositions were also studied. The results indicate that sulfite concentration plays a vital role in NO 2 absorption. The main absorption products are NO 3 − and NO 2 − , and NO 2 − can be converted into NO 3 − in the presence of oxygen. Besides, about 4% to 9% by-products of S compositions are formed, and 4% to 11% by-products of N compositions such as NO, N 2 , N 2 O 5 , N 2 O, and HNO 3 in the gas phase were detected in the emissions from the bubbling reactor. On the basis of N and S compositions, a possible pathway of NO 2 absorption in sulfite solution was proposed.

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Integrative process of preoxidation and absorption for simultaneous removal of SO2, NO and Hg0

Cited by 89 publications

References 42 publications

Simultaneous removal of SO 2 , NO and Hg 0 through an integrative process utilizing a cost-effective complex oxidant

Simultaneous removal of SO 2 , NO and Hg 0 through an integrative process utilizing a cost-effective complex oxidant

Emission characteristics of Cl₂ and ClO₂ during simultaneous removal of SO₂ and NO using NaClO₂ solution

The Chemical Behaviors of Nitrogen Dioxide Absorption in Sulfite Solution

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Integrative process of preoxidation and absorption for simultaneous removal of SO2, NO and Hg0

Cited by 89 publications

References 42 publications

Simultaneous removal of SO 2 , NO and Hg 0 through an integrative process utilizing a cost-effective complex oxidant

Simultaneous removal of SO 2 , NO and Hg 0 through an integrative process utilizing a cost-effective complex oxidant

Emission characteristics of Cl2 and ClO2 during simultaneous removal of SO2 and NO using NaClO2 solution

The Chemical Behaviors of Nitrogen Dioxide Absorption in Sulfite Solution

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Emission characteristics of Cl₂ and ClO₂ during simultaneous removal of SO₂ and NO using NaClO₂ solution