Advanced oxidation removal of NO and SO2 from flue gas by using ultraviolet/H2O2/NaOH process

Liu, Yangxian; Wang, Qian; Yin, Yanshan; Pan, Jianfeng; Zhang, Jun

doi:10.1016/j.cherd.2013.12.015

Cited by 74 publications

(41 citation statements)

References 32 publications

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“…Fortunately, advanced oxidation technology seems to be a promising approach and has drawn much attention recently. The ultraviolet (UV)/H 2 O 2 advanced oxidation process is a typical method for purifying flue gas and can achieve a relatively high NO oxidation efficiency [4,5]. However, this breakthrough technique was found to be hard to realize for a real scale application due to a high operating cost and unfeasibility for implementation.…”

Section: Introductionmentioning

confidence: 99%

Removal of NOX Using Hydrogen Peroxide Vapor over Fe/TiO2 Catalysts and an Absorption Technique

Chen

Zhao

et al. 2017

Catalysts

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Abstract:In this study, we proposed an innovative oxidation-absorption method for low-temperature denitrification (160-240 • C), in which NO is initially catalytically oxidized by hydrogen peroxide (H 2 O 2 ) vapor over titania-based catalysts, and the oxidation products are then absorbed by NaOH solution. The effects of flue gas temperature, molar H 2 O 2 /NO ratio, gas hourly space velocity (GHSV), and Fe substitution amounts of Fe/TiO 2 catalysts on the denitrification efficiency were investigated by a well-designed experiment. The results indicated that the Fe/TiO 2 catalyst exhibited a combination of remarkable activity and deep oxidation ability (NO converted into harmless NO 3 − ). In order to comprehend the functional mechanism of the Fe dopant's local environment in TiO 2 support, the promotional effect of the calcination temperature of Fe/TiO 2 on the denitration performance was also studied. A tentative synergetic mechanism could be interpreted from two aspects: (1) Fe 3+ as a substitute of Ti 4+ , leading to the formation of enriched oxygen vacancies at the surface, could significantly improve the adsorption efficiency of •OH; (2) the isolated surface Fe ion holds a strong adsorption affinity for NO, such that the adsorbed NO could be easily oxidized by the pre-formed •OH. This process offers a promising alternative for current denitrification technology.

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Section: Introductionmentioning

confidence: 99%

Removal of NOX Using Hydrogen Peroxide Vapor over Fe/TiO2 Catalysts and an Absorption Technique

Chen

Zhao

et al. 2017

Catalysts

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“…SO 2 solubility in aqueous solutions is larger than that of NO and can more quickly reach reaction zone and competes with NO in consuming OH radicals or H 2 O 2 according to Eq. (12)-(13) [3,4,20,29,37]. As data in Fig.…”

Section: Competitive Absorption Of No In Presence Of So 2 : the Effecmentioning

confidence: 93%

“…However, the electrolytic process for producing H 2 O 2 consumes approximately 7.7 kWh per 1 kg of H 2 O 2 produced [19]. Some complex agents such as Fe II EDTA, Fe II (CYS) 2 and Co III (en) 3 and sono-chemical oxidation have been used to improve the absorption rate of NO in solutions [6,7,16,[19][20][21]. The use of these chemicals and methods often involves high costs and technical problems.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of electrical energy consumption in UV/H2O2 advanced oxidation process for simultaneous removal of NO and SO2

Shahrestani¹,

Rahimi²

2018

Environmental Engineering Research

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The electrical energy consumption (EEC) in removal of NO by a UV/H2O2 oxidation process was introduced and related to removal efficiency of this gas. The absorption-reaction of NO was conducted in a bubble column reactor in the presence of SO2. The variation in NO removal efficiency was investigated for various process parameters including NO and SO2 inlet concentrations, initial concentration of H2O2 solution and gas flow rate. EEC values were obtained in these different conditions. The removal efficiency was increased from about 22% to 54.7% when H2O2 concentration increased from 0.1 to 1.5 M, while EEC decreased by about 70%. However, further increase in H2O2 concentration, from 1.5 to 2, had no significant effect on NO absorption and EEC. An increase in NO inlet concentration, from 200 to 500 ppm, decreased its removal efficiency by about 10%. However, EEC increased from 2.9 × 10 -2 to 3.9 × 10 -2 kWh/m 3 . Results also revealed that the presence of SO2 had negative effect on NO removal percentage and EEC values. Some experiments were conducted to investigate the effect of H2O2 solution pH. The changing of pH of oxidation-absorption medium in the ranges between 3 to 10, had positive and negative effects on removal efficiency depending on pH value.

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“…Gaseous pollutants including SO 2 and NO x are released during coal-burning and other combustion processes. The emission of these gases is a major environmental concern because of their negative effect on human health and ecosystems [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…A wet scrubbing process like wet limestone-gypsum scrubbing is the most widely used approach with high SO 2 and NO 2 removal efficiency [8,9]. However, this method cannot reach high NO removal efficiency because of very low solubility of this component which constitutes about 90-95 % of the entire NO x emissions [5][6][7]10]. This low solubility greatly increases the liquid-phase resistance to mass transfer [7,10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Mathematical Modeling of NO Removal Using the UV/H₂O₂ Advanced Oxidation Process

2017

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An experimental study on NO removal via UV/H2O2 process was conducted in a semi‐continuous bubble‐column reactor and the effect of some operation parameters including NO initial concentration and gas flow rates on removal efficiency was investigated. Applying UV light increased the efficiency significantly. The steady‐state removal efficiency was found to be higher at the lower gas flow rates. The bubble size as an important factor in mass transfer calculations and modeling procedure was determined at different gas flow rates using bubble photographs and image processing technique. In the ranges of flow rates studied here, the gas flow rate had no significant effect on the bubble diameter. A mathematical model was developed to describe the NO removal process. The model predictions were compared with existing experimental data, confirming a good agreement of the data.

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Advanced oxidation removal of NO and SO2 from flue gas by using ultraviolet/H2O2/NaOH process

Cited by 74 publications

References 32 publications

Removal of NOX Using Hydrogen Peroxide Vapor over Fe/TiO2 Catalysts and an Absorption Technique

Removal of NOX Using Hydrogen Peroxide Vapor over Fe/TiO2 Catalysts and an Absorption Technique

Evaluation of electrical energy consumption in UV/H2O2 advanced oxidation process for simultaneous removal of NO and SO2

Experimental Study and Mathematical Modeling of NO Removal Using the UV/H₂O₂ Advanced Oxidation Process

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Advanced oxidation removal of NO and SO2 from flue gas by using ultraviolet/H2O2/NaOH process

Cited by 74 publications

References 32 publications

Removal of NOX Using Hydrogen Peroxide Vapor over Fe/TiO2 Catalysts and an Absorption Technique

Removal of NOX Using Hydrogen Peroxide Vapor over Fe/TiO2 Catalysts and an Absorption Technique

Evaluation of electrical energy consumption in UV/H2O2 advanced oxidation process for simultaneous removal of NO and SO2

Experimental Study and Mathematical Modeling of NO Removal Using the UV/H2O2 Advanced Oxidation Process

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Experimental Study and Mathematical Modeling of NO Removal Using the UV/H₂O₂ Advanced Oxidation Process