Combination of photocatalysis downstream the non-thermal plasma reactor for oxidation of gas-phase toluene

Huang, Haibao; Ye, Daiqi

doi:10.1016/j.jhazmat.2009.06.033

Cited by 70 publications

(21 citation statements)

References 23 publications

(25 reference statements)

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“…Electrical characteristics of the discharge An electrical characterization of the plasma reactor must precede the chemical study (Mario et al 2008;Huang and Ye 2009). This step is necessary in order to establish an energy balance of the process, as well as to determine and control energy consumption.…”

Section: Resultsmentioning

confidence: 99%

Ethylene decomposition with a wire-plate dielectric barrier discharge reactor: parameters and kinetic study

Lan

2015

Int. J. Environ. Sci. Technol.

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Ethylene is an undesirable compound for the storage of horticultural products. The traditional freshkeeping method of fruits and vegetables is refrigeration. However, even in refrigeration environment, ethylene is released by horticultural products themselves or other sources. The residual ethylene can accelerate maturation and corruption of horticultural products and thus should better be wiped away. The technique of dielectric barrier discharge was applied to decompose ethylene. Under electric discharge, many energetic and highly reactive species can be produced, which can react with and decompose the chemical compounds in contact with them. In this study, the efficiency of ethylene removal using dielectric barrier discharge reactor was studied. Ethylene removal rates were affected by many factors, such as gas discharge gap, wire distance, flow rate, ethylene initial concentration and humidity. The kinetics of ethylene removal was studied. To disintegrate ethylene, the optimal discharge gap was 3 mm, wire distance 0.5 mm, gas flow rate 3.5 L min -1 and humidity 61 %. Two kinetics models were selected for ethylene decomposition, and experimental results could fit the model with a maximum absolute error of 4 %. With optimal discharge condition, ethylene can totally be removed. In the future, decomposition of ethylene by dielectric barrier discharge technology will be a promising method to keep fruits and vegetables fresh.

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Section: Resultsmentioning

confidence: 99%

Ethylene decomposition with a wire-plate dielectric barrier discharge reactor: parameters and kinetic study

Lan

2015

Int. J. Environ. Sci. Technol.

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“…It is utilized as the oxidant precursor by PCO and improved removal efficiency and durability of photocatalyst (Huang and Ye 2009). In PCO process, ozone is decomposed to atomic and molecular oxygen by UV irradiation or catalyst as Eq.…”

Section: By-productsmentioning

confidence: 99%

“…It seems that increasing the residence time of pollutants in plasma reactor without changing the size of the reactor and transferring the byproducts toward reoxidation are appropriate options for increasing efficiency (Subrahmanyam et al 2006). In recent years, many researchers have investigated the combination of NTP with photocatalytic oxidation (PCO); they have reported that this system has a synergistic effect (Huang and Ye 2009;Lu et al 2012;Maciuca et al 2012;Sun et al 2007;Thevenet et al 2007;Zhu et al 2008). In this system, the activation of catalyst is attributed to the light emitted and active species created by the plasma.…”

Section: Introductionmentioning

confidence: 99%

“…This increase of oxidation process leads to an increase in oxidation agents: hydroxyl, proxy and so forth, which as a whole results in a synergistic effect on organic compounds removal. In this system, the unoxidized pollutant and generated by-products resulted from the plasma process (organic by-products, CO, NO x and ozone) are reoxidized by the mentioned methods which cause an increase in removal efficiency of the pollutant and selectivity of CO 2 (Huang and Ye 2009;Lu et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Decomposition of gas-phase chloroform using nanophotocatalyst downstream the novel non-thermal plasma reactor: by-products elimination

Shahna

Ebrahimi

Jaleh

et al. 2015

Int. J. Environ. Sci. Technol.

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Combination the non-thermal plasma technique by photocatalytic oxidation can enhance volatile organic compounds degradation. In this study, the decomposition of chloroform vapors in a novel non-thermal plasma reactor as well as an integrated system of this reactor in conjunction with the photocatalysis process was investigated. Expanded graphite was used as discharge electrode of dielectric barrier discharge reactor and the support of TiO 2 and ZnO catalysts as well. Results showed that chloroform degradation increased in hybrid system. The non-thermal plasma reactor had high content of NO and NO 2 , whereas the concentration of these two pollutants dropped dramatically in hybrid system; moreover, the generated ozone from the non-thermal plasma process was degraded on the photocatalyst and consequently was not detected in the output gas of the combined system. The generated organic by-products in non-thermal plasma process (phosgene and trichloroacetaldehyde) were reoxidized with un-oxidized chloroform in the second stage of the combined system. This increased the selectivity of CO 2 and Cl 2 .

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“…More generally, it is required to investigate the performances of any air treatment process under humid conditions: first to address realistic conditions, second to be able to assess the effective role of moisture on the process performance which can be twofold. Although water can be dissociated to produce HO• radicals beneficial for VOC oxidation, high humidity levels are detrimental to O 3 by decreasing O concentration on the catalyst surface [30].…”

Section: Introductionmentioning

confidence: 99%

Plasma-Catalytic Mineralization of Toluene Adsorbed on CeO2

et al. 2018

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Abstract:In the context of coupling nonthermal plasmas with catalytic materials, CeO 2 is used as adsorbent for toluene and combined with plasma for toluene oxidation. Two configurations are addressed for the regeneration of toluene saturated CeO 2 : (i) in plasma-catalysis (IPC); and (ii) post plasma-catalysis (PPC). As an advanced oxidation technique, the performances of toluene mineralization by the plasma-catalytic systems are evaluated and compared through the formation of CO 2 . First, the adsorption of 100 ppm of toluene onto CeO 2 is characterized in detail. Total, reversible and irreversible adsorbed fractions are quantified. Specific attention is paid to the influence of relative humidity (RH): (i) on the adsorption of toluene on CeO 2 ; and (ii) on the formation of ozone in IPC and PPC reactors. Then, the mineralization yield and the mineralization efficiency of adsorbed toluene are defined and investigated as a function of the specific input energy (SIE). Under these conditions, IPC and PPC reactors are compared. Interestingly, the highest mineralization yield and efficiency are achieved using the in-situ configuration operated with the lowest SIE, that is, lean conditions of ozone. Based on these results, the specific impact of RH on the IPC treatment of toluene adsorbed on CeO 2 is addressed. Taking into account the impact of RH on toluene adsorption and ozone production, it is evidenced that the mineralization of toluene adsorbed on CeO 2 is directly controlled by the amount of ozone produced by the discharge and decomposed on the surface of the coupling material. Results highlight the key role of ozone in the mineralization process and the possible detrimental effect of moisture.

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Combination of photocatalysis downstream the non-thermal plasma reactor for oxidation of gas-phase toluene

Cited by 70 publications

References 23 publications

Ethylene decomposition with a wire-plate dielectric barrier discharge reactor: parameters and kinetic study

Ethylene decomposition with a wire-plate dielectric barrier discharge reactor: parameters and kinetic study

Decomposition of gas-phase chloroform using nanophotocatalyst downstream the novel non-thermal plasma reactor: by-products elimination

Plasma-Catalytic Mineralization of Toluene Adsorbed on CeO2

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