Kinetic modeling for the deactivation of TiO2 during the photocatalytic removal of low concentration SO2

Wang, Haiming; Xie, Dong; Chen, Qun; You, Changfu

doi:10.1016/j.cej.2016.06.015

Cited by 20 publications

(6 citation statements)

References 33 publications

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“…To model this influence on photocatalytic processes, one frequently needs to set mathematical equations that may be specific to each case. For example, via a mathematical fitting, Wang and et al set the mathematical relationship between the oxidation rate coefficient and water concentration.…”

Section: Kinetic Analysismentioning

confidence: 99%

A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO₂‐based catalysts

2019

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Humidity can have an appreciable influence on the photocatalytic degradation of volatile organic compounds (VOCs) in air. It has been proposed that there are multiple layers of water molecules on the surface of the photocatalyst, and a VOC molecule must penetrate this layer and be able to diffuse to the photocatalytic surface for a reaction to occur. An updated analysis of related literature from the past 12 years indicates that this proposed mechanism remains reasonable for explaining observed effects. According to this mechanism the VOC's hydrophilicity should dominate the influence of humidity on the photocatalytic reaction kinetics, and this effect can be seen in a categorization of literature observations based on the octanol‐water partition coefficient. The frequently cited Langmuir‐Hinshelwood kinetic model does not directly account for humidity effects in this way but can be adapted for this purpose. As an example, the rate of photocatalytic decomposition of chlorobenzene in air under humid conditions can be described by a modified Langmuir‐Hinshelwood kinetic model, where the reaction rate coefficient is dependent on the water concentration. Understanding and considering the effect of humidity is useful for optimizing the efficacy of photocatalytic VOC treatment of air.

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Section: Kinetic Analysismentioning

confidence: 99%

A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO₂‐based catalysts

2019

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“…The deactivation kinetic of the PEI-based CO 2 adsorbent plays a significant role in determining the reaction mechanism, estimating the influences of different operation conditions, and providing effective methods to prevent the rapid deactivation of the adsorbents. , Accurate kinetic models could be applied to evaluate adsorbent performance and support the designs of reactors and processes. The model of the deactivation kinetics established at reasonable temperatures is also an approach for the prediction of the service life of the PEI-based adsorbent used at 20–30 °C.…”

Section: Introductionmentioning

confidence: 99%

Deactivation Kinetics of Polyethylenimine-based Adsorbents Used for the Capture of Low Concentration CO₂

Yang

et al. 2019

ACS Omega

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CO 2 emission is generally regarded as the major contributor to global climate change, and polyethylenimine (PEI)-based CO 2 adsorbents are promising materials for the capture of low concentration CO 2 . This paper deals with the deactivation kinetics of PEI-based CO 2 adsorbents used for the capture of low concentration CO 2 . EA and TG analyses demonstrated that thermal degradation and O 2 -induced deactivation of the adsorbents occurred simultaneously under air exposure conditions. It was found by N 2 exposure experiments at the temperature of 50–80 °C that the thermal degradation of PEI-based adsorbents followed a first-order reaction model with an activation energy of 80.98 kJ/mol and a pre-exponential factor of 6.055 × 10 8 (h –1 ). The parallel reaction model was employed to distinguish the O 2 -induced deactivation from the thermal degradation of the adsorbents through air exposure experiments within 50–80 °C. The O 2 -induced deactivation exhibited a second-order reaction with an activation energy of 74.47 kJ/mol and a pre-exponential factor of 6.321 × 10 6 (% –1 ·h –1 ). The results of simulating the overall deactivation of the adsorbents by the parallel reaction kinetic model were well consistent with those of the experiments, proving that the parallel reaction model was feasible for the description of the deactivation of PEI-based adsorbents.

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“…To undergo the process of the SO 2 oxidation reaction (SO 2 OR) on the anode, platinum and other novel catalysts have been served as a catalyst for the past decade. Of note, the photoelectrochemical method has been widely applied in pollutant removal from different conditions, possessing the advantages of a mild operation atmosphere and no pollution with sunlight as an energy source. − In the photoelectrocatalytic process, the holes stimulated on the semiconductor surface have a strong ability to oxidize SO 3 2– to SO 4 2– , thereby overcoming the drawbacks of forced oxidation in the adsorption method. However, the strong alkaline condition for SO 2 conversion poses a challenge to the stability of the photoelectrode materials.…”

Section: Introductionmentioning

confidence: 99%

Efficient SO₂ Removal and Highly Synergistic H₂O₂ Production Based on a Novel Dual-Function Photoelectrocatalytic System

Mei

Bai

Chen

et al. 2020

Environ. Sci. Technol.

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The direct conversion of SO2 to SO3 is rather difficult for flue gas desulfurization due to its inert dynamic with high reaction activation energy, and the absorption by wet limestone-gypsum also needs the forced oxidation of O2 to oxidize sulfite to sulfate, which is necessary for additional aeration. Here, we propose a method to remove SO2 with highly synergistic H2O2 production based on a novel dual-function photoelectrocatalytic (PEC) system in which the jointed spontaneous reaction of desulfurization and H2O2 production was integrated instead of nonspontaneous reaction of O2 to H2O2. SO2 was absorbed by alkali liquor then oxidized quickly into SO4 2– by a nanorod α-Fe2O3 photoanode, which possessed high alkali corrosion resistance and electron transport properties. H2O2 was produced simultaneously in the cathode chamber on a gas diffusion electrode and was remarkably boosted by the conversion reaction of SO3 2– to SO4 2– in the anode chamber in which the released chemical energy was effectively used to increase H2O2. The photocurrent density increased by 40% up to 1.2 mA·cm–2, and the H2O2 evolution rate achieved 58.8 μmol·L–1·h–1·cm–2 with the synergistic treatment of SO2, which is about five times than that without SO2. This proposed PEC cell system offers a cost-effective and environmental-benign approach for dual purpose of flue gas desulfurization and simultaneous high-valued H2O2 production.

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Kinetic modeling for the deactivation of TiO2 during the photocatalytic removal of low concentration SO2

Cited by 20 publications

References 33 publications

A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO₂‐based catalysts

A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO₂‐based catalysts

Deactivation Kinetics of Polyethylenimine-based Adsorbents Used for the Capture of Low Concentration CO₂

Efficient SO₂ Removal and Highly Synergistic H₂O₂ Production Based on a Novel Dual-Function Photoelectrocatalytic System

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Kinetic modeling for the deactivation of TiO2 during the photocatalytic removal of low concentration SO2

Cited by 20 publications

References 33 publications

A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO2‐based catalysts

A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO2‐based catalysts

Deactivation Kinetics of Polyethylenimine-based Adsorbents Used for the Capture of Low Concentration CO2

Efficient SO2 Removal and Highly Synergistic H2O2 Production Based on a Novel Dual-Function Photoelectrocatalytic System

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A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO₂‐based catalysts

A review of the influence of humidity on photocatalytic decomposition of gaseous pollutants on TiO₂‐based catalysts

Deactivation Kinetics of Polyethylenimine-based Adsorbents Used for the Capture of Low Concentration CO₂

Efficient SO₂ Removal and Highly Synergistic H₂O₂ Production Based on a Novel Dual-Function Photoelectrocatalytic System