Destruction of HCFC-22 and Distribution of Byproducts in a Nonthermal Plasma Reactor Packed with Dielectric Pellets

Oh, Jae-Hyuk; Mok, Young Sun; Lee, Sang-Baek; Chang, Myung Shik

doi:10.3938/jkps.54.1539

Cited by 9 publications

(5 citation statements)

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“…The results showed that it increased by increasing voltage from 15 to 20 kV. In addition, other studies have reported that the efficiency increases when there is an increase in applied voltage which is because of active species and collision increase with pollutant resulting in an increase in removal efficiency (Kwong et al 2008;Liang et al 2013;Mista and Kacprzyk 2008;Oh et al 2009). In NTP process, linear decrease in removal of dichloromethane and benzene has been reported by increasing inlet concentration (Abd Allah et al 2013;Karuppiah et al 2012a, b, c).…”

Section: Resultssupporting

confidence: 48%

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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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Section: Resultssupporting

confidence: 48%

“…In NTP, the generation of NO is inevitable in the presence of O 2 and N 2 ; NO can be easily oxidized to NO 2 by proxy radicals or ozone (Oh et al 2009). The generation of NO and its conversion to NO 2 can be written as Eqs.…”

Section: By-productsmentioning

confidence: 99%

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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“…The efficiency of the VOCs degradation by NTP is determined by many parameters, such as the power supply type and polarity [20,21], the reactor configuration [22,23], the initial concentration of VOCs [24][25][26], etc, no matter with or without the catalysts. The most distinctive characteristic of NTP as a VOCs process is their ability to induce various chemical reactions at atmospheric pressure and room temperature.…”

mentioning

confidence: 99%

The effect of ionization energy and hydrogen weight fraction on the non-thermal plasma volatile organic compounds removal efficiency

Zhao¹,

Liu²,

Liu³

et al. 2019

J. Phys. D: Appl. Phys.

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Volatile organic compounds (VOCs) such as benzene (C 6 H 6 ), methylbenzene (C 6 H 5 CH 3 ), dichloromethane (CH 2 Cl 2 ) and methyl ethyl ketone (CH 3 COCH 2 CH 3 ), are exhausted into the atmosphere from a variety of industrial processes [1]. The removals of these VOCs are required because they are responsible for many environmental problems and diseases such as ozone depletion, photochemical smog, heart disease, asthma and even cancer [1][2][3][4]. There exist a lot of traditional techniques for VOCs degradation, including adsorption, incineration and condensation [5][6][7][8]. These methods have

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“…The energetic parameters of Freon destruction obtained in the present experiment are superior to those when other plasma methods (e.g. corona [22], barrier discharges [23,24], gliding [25] and arc [8,26,27] discharges, low-power [10][11][12] or moderated-power [13] microwave torch discharges) were employed for destruction of Freons. Among the other plasma methods, the best energetic parameters (mass yield rate and energetic mass yield) of HFC-134a destruction were achieved by Watanabe et al [26] and Ohno et al [27] using DC arc plasma torches.…”

Section: Resultsmentioning

confidence: 80%

Destruction of Freon HFC-134a Using a Nozzleless Microwave Plasma Source

Jasiński

Dors

Mizeraczyk

2009

Plasma Chem Plasma Process

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In this paper, results of the pyrolysis of Freon HFC-134a (tetrafluoroethane C 2 H 2 F 4 ) in an atmospheric pressure microwave plasma are presented. A waveguide-based nozzleless cylinder-type microwave plasma source (MPS) was used to produce plasma for the destruction of Freon HFC-134a. The processed gaseous Freon HFC-134a at a flow rate of 50-212 l min -1 was introduced to the plasma by four gas ducts which formed a swirl flow in the plasma reactor (a quartz cylinder). The absorbed microwave power was 0.6-3 kW. The experimental results showed that the Freon was converted into carbon black, hydrogen and fluorine. The total conversion degree of HFC-134a was up to 84% with selectivity of 100% towards H 2 , F 2 and C 2 , which means that there was no conversion of HFC-134a into other hydrocarbons. The Freon destruction mass rate and corresponding energetic mass yield were up to 34.5 kg h -1 and 34.4 kg per kWh of microwave energy absorbed by the plasma, respectively.

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Destruction of HCFC-22 and Distribution of Byproducts in a Nonthermal Plasma Reactor Packed with Dielectric Pellets

Cited by 9 publications

References 0 publications

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

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

The effect of ionization energy and hydrogen weight fraction on the non-thermal plasma volatile organic compounds removal efficiency

Destruction of Freon HFC-134a Using a Nozzleless Microwave Plasma Source

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