Kinetics of Nitric Oxide Absorption from Simulated Flue Gas by a Wet UV/Chlorine Advanced Oxidation Process

Yang, Shaolong; Pan, Xinxiang; Han, Zhitao; Zhao, Dongsheng; Liu, Bojun; Zheng, Dekang; Yan, Zhijun

doi:10.1021/acs.energyfuels.7b00458

Cited by 19 publications

(6 citation statements)

References 35 publications

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“…Water-insoluble nitric oxide (NO) gas accounts for 90% of NO x , which causes the water solubility of NO x to be lower than that of SO 2. Therefore, the main method to simultaneously remove SO 2 and NO from marine diesel engine exhaust gases using the wet scrubbing technique is to oxidize the NO to relatively water-soluble nitrogen oxides. , Various oxidants, such as NaClO 2 , KMnO 4 , NaClO, H 2 O 2 , O 3 , ClO 2 , and hexamine cobalt(II)/iodide, have been studied, and some of these oxidants have been used in the wet scrubbing technique for onshore flue gases. − The own condition and environment that ships navigate limits the use of wet scrubbing control technologies based on some expensive, unstable, and toxic reagents. Sodium persulfate (Na 2 S 2 O 8 ) is an environmentally friendly oxidizing reagent that has many advantages, such as a low price, high stability, strong oxidation ability, and nontoxicity.…”

Section: Introductionmentioning

confidence: 99%

Novel Method Using Na₂S₂O₈ as an Oxidant to Simultaneously Absorb SO₂ and NO from Marine Diesel Engine Exhaust Gases

Zhou

Zhang

2020

Energy Fuels

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Nitric oxide and sulfur dioxide from the exhaust gases of marine diesel engines are harmful for the environment and human health. Environmentally friendly sodium persulfate, which satisfies the requirements of ships and navigation, was used as the main absorbent for the simultaneous removal of SO2 and NO in a self-designed bubble column reactor with an industrial gas distributor in this work. The focus of this work was the absorption of the insoluble NO. The influences of various parameters including the reaction temperature, Na2S2O8 concentration, NO concentration, pH value of the solution, and presence of coexisting gases on NO absorption were comprehensively and systematically studied according to the different working conditions of marine diesel engines. Furthermore, experiments for simultaneously removing SO2 and NO were conducted. Different from the previous studies, the new experimental results showed that the increase of NO concentration and the pH value of 12 were not conducive to the NO absorption; the highest removal efficiency of NO was at pH of 9; the existence of sulfur dioxide weakened the absorption of nitric oxide; the final products of the simultaneous absorption were sulfate and nitrate according to the product detection results. However, the SO2 and NO in simulated exhaust gases (900 ppm SO2, 1000 ppm NO, 15% O2 and 5% CO2) from marine diesel engines were completely absorbed under nonoptimal conditions (at 70 °C and in a 0.15 mol/L sodium persulfate solution), which indicated that sodium persulfate is promising for use in wet emission control technologies for marine diesel engines.

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Section: Introductionmentioning

confidence: 99%

Novel Method Using Na₂S₂O₈ as an Oxidant to Simultaneously Absorb SO₂ and NO from Marine Diesel Engine Exhaust Gases

Zhou

Zhang

2020

Energy Fuels

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“…Compared with H 2 O 2 and PS, hypochlorite (ClO – ) has a higher quantum yield (close to 1.0 mol·Einstein –1 ) and is better in the degradation of emerging contaminants and some micropollutants. − The main radicals produced in UV/ClO – are HO • and Cl • (eq ). Yang et al and Liu et al used UV/NaClO (1500 mg/L [Cl 2 ]) and UV/Ca(ClO) 2 (0.16 mol/L) to conduct the experiment of simultaneous removal of SO 2 and NO, and the NO removal efficiencies were 95.6 and 92.4%, respectively; also, as a result of its high alkalinity, the SO 2 removal efficiency also reached 100%, and the presence of SO 2 accelerated the formation of HClO, which further increased the yield of HO • . Hence, ClO – is a suitable radical precursor for photocatalytic removal of SO 2 and NO. …”

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of SO₂ and NO Using a Novel Method of Ultraviolet Irradiating Chlorite–Ammonia Complex

Hao

Mao

Qian

et al. 2019

Environ. Sci. Technol.

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A novel advanced oxidation process (AOP) using ultraviolet/sodium chlorite (UV/NaClO2) is developed for simultaneous removal of SO2 and NO. NH4OH, as an additive, was used to inhibit the generation of ClO2 and NO2. The removal efficiencies of SO2 and NO reached 98.7 and 99.1%. NO removal was enhanced by greater UV light intensity and shorter wavelengths but was insensitive to changes in pH and temperature. SO2 at 500–1000 mg/m3 improved NO removal, especially in the absence of UV. The coexistence of SO2 and O2 facilitated the removal of NO by ClO2 –. HCO3 –, Cl–, and Br– enhanced NO removal, but their roles were negligible when UV was added. The generation of ClO2 and ClO•/HO• was verified by an UV–vis spectrometer, electron spin resonance (ESR), and radical-quenching tests. The mechanisms responsible for the removal of SO2 and NO were attributed to the synergism between acid–base neutralization and radical-induced oxidation. The ClO2 – evolution and product composition were demonstrated by UV–vis and X-ray photoelectron spectroscopy (XPS). Kinetics analyses showed that the Hatta numbers were 329–798 and 747–1000 without and with UV. Thus, the gas–film resistance mainly controlled the mass-transfer process.

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“…As the reacting temperature increases, the CO removing efficiencies and removal rates first rise and then drop (308 K is the best temperature for CO removal efficiency, and 338 K is the best temperature for the CO removal rate in the Cu 2+ -modified new Fenton system; 318 K is the best temperature for CO removal efficiency, and 328 K is the best temperature for the CO removal rate in the Mn 2+ -modified new Fenton system). Related research , suggest that the reaction rates (e.g., those of eqs – and –) will be elevated by the rise of temperature, thereby able to improve the removal of CO. However, some investigators − also had pointed out that raising temperature would cause a decline of solubility of CO in the liquid phase.…”

Section: Results and Discussionmentioning

confidence: 99%

Removal of Carbon Monoxide from Simulated Flue Gas Using Two New Fenton Systems: Mechanism and Kinetics

Wang

Han

Liu

2019

Environ. Sci. Technol.

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Two novel removal processes of carbon monoxide using two new Fenton systems (i.e., Cu2+/Fe2+ and Mn2+/Fe2+ coactivated H2O2 systems) were developed. The effect of several process parameters (concentrations of H2O2, Fe2+, Cu2+, and Mn2+, reagent pH value, solution temperature, and simulated flue gas components) on CO removal was studied in a bubbling reactor. The mechanism and kinetics of CO removal were also revealed. Results show that adding Cu2+ or Mn2+ obviously enhances the removal process of CO in new Fenton systems. The measured results of free radical yield demonstrate that the enhancing role is derived from producing more ·OH (they are produced due to the synergistic activation role of Cu2+/Fe2+ or Mn2+/Fe2+ in new Fenton systems. The removal efficiency of CO is raised by increasing concentrations of Fe2+, Cu2+, and Mn2+ and is reduced by raising concentrations of CO, NO, and SO2. Increasing H2O2 concentration, reagent pH, and solution temperature demonstrates a dual impact on CO absorption. Three oxidation pathways are found to be responsible for CO removal in new Fenton systems. Results of mass-transfer reaction kinetics reveal that CO removal processes are located in a fast-speed reaction kinetics region (the CO removal process is controlled by the mass transfer rate).

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Kinetics of Nitric Oxide Absorption from Simulated Flue Gas by a Wet UV/Chlorine Advanced Oxidation Process

Cited by 19 publications

References 35 publications

Novel Method Using Na₂S₂O₈ as an Oxidant to Simultaneously Absorb SO₂ and NO from Marine Diesel Engine Exhaust Gases

Novel Method Using Na₂S₂O₈ as an Oxidant to Simultaneously Absorb SO₂ and NO from Marine Diesel Engine Exhaust Gases

Simultaneous Removal of SO₂ and NO Using a Novel Method of Ultraviolet Irradiating Chlorite–Ammonia Complex

Removal of Carbon Monoxide from Simulated Flue Gas Using Two New Fenton Systems: Mechanism and Kinetics

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Kinetics of Nitric Oxide Absorption from Simulated Flue Gas by a Wet UV/Chlorine Advanced Oxidation Process

Cited by 19 publications

References 35 publications

Novel Method Using Na2S2O8 as an Oxidant to Simultaneously Absorb SO2 and NO from Marine Diesel Engine Exhaust Gases

Novel Method Using Na2S2O8 as an Oxidant to Simultaneously Absorb SO2 and NO from Marine Diesel Engine Exhaust Gases

Simultaneous Removal of SO2 and NO Using a Novel Method of Ultraviolet Irradiating Chlorite–Ammonia Complex

Removal of Carbon Monoxide from Simulated Flue Gas Using Two New Fenton Systems: Mechanism and Kinetics

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Novel Method Using Na₂S₂O₈ as an Oxidant to Simultaneously Absorb SO₂ and NO from Marine Diesel Engine Exhaust Gases

Novel Method Using Na₂S₂O₈ as an Oxidant to Simultaneously Absorb SO₂ and NO from Marine Diesel Engine Exhaust Gases

Simultaneous Removal of SO₂ and NO Using a Novel Method of Ultraviolet Irradiating Chlorite–Ammonia Complex