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

Zhao, Yi; Hao, Runlong; Yuan, Bo; Jiang, Jiajun

doi:10.1016/j.jhazmat.2015.08.049

Cited by 112 publications

(57 citation statements)

References 27 publications

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“…The acidic condition is favourable for H 2 O 2 to exhibit high oxidation capacity because the H 2 O 2 molecule remains in a stable form (HO‐OH) . The HO‐OH form was helpful for the ·OH generation and promoted the reaction (Equation –(5)).…”

Section: Resultsmentioning

confidence: 99%

Investigation of advanced NO oxidation process with the delivery of ·OH from thermal decomposition of H₂O₂

et al. 2019

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Development of an efficient and economic NO oxidation technology is the key step for the simultaneous removal of NOx and SO2 in coal‐fired power plants. In this work, a novel advanced oxidation process of NO was proposed, which directly delivered highly oxidative hydroxyl radicals (·OH) generated from the thermal activation of H2O2 vapour into flue gas flow. The experiments were demonstrated in a lab‐scale device, measuring the oxidation of NO as the indicator of radical formation and delivery. The influence of various operational parameters on NO oxidation was evaluated. Increasing the H2O2 dosage, the temperature of the hot‐nitrogen, the flow rate of the hot‐nitrogen, and the total gas residence time greatly enhances the NO oxidation. The NO oxidation was inhibited obviously with the increasing of the H2O2 pH and the NO initial concentration. Increasing the H2O2 pH and the NO initial concentration obviously reduced the NO oxidation. The results indicated that the thermal activation of H2O2 is feasible to oxidize NO and that the H2O2 homogeneous thermal decomposition reaction is essential, therefore, the temperature and the flow rate of the hot‐nitrogen can significantly affect the conversion efficiency. Finally, a potential application was proposed, where NO oxidation by gas‐phase H2O2 can be coupled with the general SCR system to meet stringent regulatory requirements and with a low operating cost.

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Section: Resultsmentioning

confidence: 99%

Investigation of advanced NO oxidation process with the delivery of ·OH from thermal decomposition of H₂O₂

et al. 2019

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“…Generally speaking, the same oxide‐reductant may also present a very different redox potential within a varied pH value solution . During the research of simultaneous removal of SO 2 , NO and Hg 0 using complex oxidant H 2 O 2 /NaClO 2 by an integrative process of pre‐oxidation combining post‐absorption, Zhao et al . found that when pH was decreased from 4.5 to 7.0, NO removal efficiency decreased greatly from 87% to 58%.…”

Section: Resultsmentioning

confidence: 99%

“…Hao et al . proposed and developed a series of integrated methods of gas oxidation with wet absorption for simultaneous removal of SO 2 and NO, and a number of complex oxidants were studied, such as Fenton/PAA/NaClO, NaClO 2 /NaBr, UV/vaporized H 2 O 2, H 2 O 2 /Na 2 S 2 O 8, H 2 O 2 /NaClO 2 etc. Moreover, advanced wet oxidation processes have also been extensively researched and developed.…”

Section: Introductionmentioning

confidence: 99%

Effects of experimental parameters on simultaneous removal of SO₂ and NO by VUV/H₂O₂ advanced oxidation process in a pilot‐scale photochemical spraying tower

Xie

Zhang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: Emissions of SO 2 and NO from flue gas have caused serious environmental pollution issues. UV/vacuum ultraviolet(VUV)-activated H 2 O 2 advanced oxidation technology is one of the most promising processes to realize the simultaneous removal of SO 2 and NO. From the application perspective, it is necessary to carry out further research in a pilot-scale photochemical reactor with industrial conditions and actual coal-fired flue gas running conditions. RESULTS: Results showed that SO 2 removal efficiency can reach 100% under most experimental conditions. An increase of the VUV irradiation intensity, H 2 O 2 concentration and solution pH can promote NO removal, but the growth rate of that gradually slows down. It is not conducive to NO removal when the flue gas flow and NO concentration increases. Increasing liquid-gas ratio has dual effects on NO removal; NO removal efficiency increases at first, and then decreases sharply. SO 2 concentration has no great impact on removal of NO. Results of ion chromatography (IC) demonstrate that SO 4 2− and NO 3 − are the major removal products of SO 2 and NO. CONCLUSION: The VUV-activated H 2 O 2 advanced oxidation technology is suitable for industrial application. The investment and operating costs of this technology are lower than those of the combined processes NH 3 -SCR and Ca-WFGD.

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“…However, simultaneous desulphurization and denitrification has become one of the greatest challenges in both environmental protection and energy issues related to fuel cells technologies . Methods such as ozone or H 2 O 2 oxidation combined with wet scrubbing and vacuum ultraviolet irradiation have already been proven to be promising methods for the simultaneous removal of SO 2 and NO x in flue gas …”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of SO₂ and NO by CO reduction over prevulcanized Fe₂O₃/AC catalysts

et al. 2019

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Low-cost Fe 2 O 3 modified activated carbon catalysts have been prepared by a facile incipient-wetness impregnation method and used for the lowtemperature simultaneous catalytic reduction of SO 2 and NO by CO. The effect of CO, NO, and SO 2 was studied experimentally by transient response method. Removal efficiencies of 95 % for NO and 100 % for SO 2 were obtained, respectively, for the optimum catalyst, in which the amount of Fe 2 O 3 was 10 wt%. It was found that the catalyst was robust enough under SO 2 and NO circumstances; moreover, the prevulcanization of Fe atoms was found to be essential for high efficiency. The reaction mechanism of the simultaneous desulphurization and denitrification reactions of Fe 2 O 3 /AC was proposed to follow both redox and COS mechanisms. These results make activated carbon supported Fe 2 O 3 highly promising for the simultaneous abatement of SO 2 and NO emissions generated during the combustion processes.

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

Cited by 112 publications

References 27 publications

Investigation of advanced NO oxidation process with the delivery of ·OH from thermal decomposition of H₂O₂

Investigation of advanced NO oxidation process with the delivery of ·OH from thermal decomposition of H₂O₂

Effects of experimental parameters on simultaneous removal of SO₂ and NO by VUV/H₂O₂ advanced oxidation process in a pilot‐scale photochemical spraying tower

Simultaneous removal of SO₂ and NO by CO reduction over prevulcanized Fe₂O₃/AC catalysts

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

Cited by 112 publications

References 27 publications

Investigation of advanced NO oxidation process with the delivery of ·OH from thermal decomposition of H2O2

Investigation of advanced NO oxidation process with the delivery of ·OH from thermal decomposition of H2O2

Effects of experimental parameters on simultaneous removal of SO2 and NO by VUV/H2O2 advanced oxidation process in a pilot‐scale photochemical spraying tower

Simultaneous removal of SO2 and NO by CO reduction over prevulcanized Fe2O3/AC catalysts

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Investigation of advanced NO oxidation process with the delivery of ·OH from thermal decomposition of H₂O₂

Investigation of advanced NO oxidation process with the delivery of ·OH from thermal decomposition of H₂O₂

Effects of experimental parameters on simultaneous removal of SO₂ and NO by VUV/H₂O₂ advanced oxidation process in a pilot‐scale photochemical spraying tower

Simultaneous removal of SO₂ and NO by CO reduction over prevulcanized Fe₂O₃/AC catalysts