Effective generation of atmospheric pressure plasma in a sandwich-type honeycomb monolith reactor by humidity control

Nguyen, Duc Ba; Saud, Shirjana; Hossain, Md. Mokter; Heo, Iljeong; Mok, Young Sun

doi:10.1016/j.cej.2020.125970

Cited by 32 publications

(24 citation statements)

References 32 publications

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“…These results agree with those obtained with the bare monolith in the previous study, which indicated that the discharge power increased as the water vapor content and degree of humidification of the monolith increased. 46 The plasma discharge in the honeycomb catalyst requires time to reach the steady state. In other words, to obtain the same discharge power or energy density, the applied voltage needs to be decreased when the water vapor content is high.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the discharge power obtained with the catalyst-coated honeycomb at the same voltage and water vapor content was higher than that obtained with the bare cordierite monolith. 46 A possible explanation for this is the improved electrical conductivity/capacitance of the honeycomb monolith owing to the presence of metals on the surface of the coated layer, as discussed above. 47 3.3.…”

Section: Methodsmentioning

confidence: 99%

“…These results are also consistent with data obtained for air plasma in the commercial cordierite monolith discharge. 46 The NO x concentration is maintained after plasma treatment, suggesting that NO x reduction or conversion to nitric acid is less likely (R11−R13) under these conditions. This could be the reason for the oxidization of NO to only NO 2 in this experiment.…”

Section: Methodsmentioning

confidence: 99%

“…Using the aforementioned sandwiched configuration, Kang et al 44 successfully generated plasma in a honeycomb with a length of 20 mm with a discharge gap of 22 mm in a temperature range from 140 to 170 °C, where the plasma discharge occurred only in the positive voltage phase. Furthermore, Nguyen et al 46 indicated that a certain amount of water in the feed gas could be used to obtain the honeycomb plasma discharge in both the negative and positive voltage phases with a 50 mm long honeycomb at room temperature. The authors also demonstrated that the plasma discharge performance with the sandwiched configuration strongly depended on the amount of water, that is, the discharge power increased as the humidity of the feed gas increased.…”

Section: Introductionmentioning

confidence: 99%

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High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

Nguyen

Matyakubov

Saud

et al. 2021

Environ. Sci. Technol.

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A two-stage plasma catalyst system for highthroughput NO x removal was investigated. Herein, the plasma stage involved the large-volume plasma discharge of humidified gas and was carried out in a sandwich-type honeycomb monolith reactor consisting of a commercial honeycomb catalyst (50 mm high; 93 mm in diameter) located between two parallel perforated disks that formed the electrodes. The results demonstrated that, in the plasma stage, the reduction of NO x did not occur at room temperature; instead, NO was only oxidized to NO 2 and n-heptane to oxygenated hydrocarbons. The oxidation of NO and n-heptane in the honeycomb plasma discharge state was largely affected by the humidity of the feed gas. Furthermore, the oxidation of NO to NO 2 occurs preferably to that of n-heptane with a tendency of the NO oxidation to decrease with increasing feed gas humidity. The reason is that the generation of O 3 decreases as the amount of water vapor in the feed gas increases. Compared to the catalyst alone, the two-stage plasma catalyst system increased NO x removal by 29% at a temperature of 200 °C and an energy density of 25 J/L.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

Nguyen

Matyakubov

Saud

et al. 2021

Environ. Sci. Technol.

Self Cite

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“…A plethora of different plasma systems have been explored for their potential to activate water, with the most common being based on atmospheric pressure air. In all cases, high voltage electricity is used to ionise a gas which yields an abundance of highly reactive chemical states [7]. When humid air is used, typical reactive species created in the plasma include O, OH, NO, O 3 , O − 2 and H 2 O 2 , these are either dissolved on contact with a liquid or react at the interface to form secondary compounds such as HNO 2 , HNO 3 and ONOOH [8].…”

Section: Introductionmentioning

confidence: 99%

Influence of Potable Water Origin on the Physicochemical and Antimicrobial Properties of Plasma Activated Water

Simon

Salgado

Hasan

et al. 2021

Plasma Chem Plasma Process

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The interaction between a cold gas plasma and water creates a plasma activated liquid, a solution rich in highly reactive chemical species. Such liquids have garnered considerable attention due to their powerful antimicrobial properties and ease of production. In this contribution, air plasma was used to activate potable water samples from five different countries, including the UK, France, Norway, Slovenia and Palestine. All water samples had an initial pH in the range of 7.9 to 8.2, following plasma activation samples from the UK and Norway reached a pH below 3, whereas water from France and Palestine remained stable at 8. The concentration of NO3− increased in all samples, reaching a maximum concentration of 3 mM after 25 min plasma exposure; whereas the concentration of NO2− showed a non-linear dependence with exposure time, reaching between 10 and 25 µM after 25 min of exposure. To demonstrate the impact of water origin on the antimicrobial potential of each solution, the inactivation of Staphylococcus aureus and Escherichia coli was considered. It was found that activated water from the UK was capable of achieving > 6 log reduction, whereas water from Palestine was only able to achieve a 0.4 log reduction, despite both liquids receiving an identical plasma exposure. The study demonstrates the importance of initial water composition on the level of plasma activation, indicating that additional purification steps prior to activation may be necessary to ensure efficacy and repeatability.

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Plasma catalytic technology for CH₄ and CO₂ conversion: A review highlighting fluidized‐bed plasma reactor

Chen

Kim

Nozaki

2023

Plasma Processes & Polymers

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The plasma catalytic valorization of gases, particularly CH4 and CO2, has gained increasing attention. Value‐added chemicals, such as syngas and ethene, can be formed under mild conditions when temperature‐decoupled plasma activation and multistep feasible catalytic conversion are combined. In this sense, efficient plasma–catalyst interaction is of key importance, for which, however, plasma catalysis, as an emerging technology, is still poorly studied, where new catalyst design and investigation took up the most effort. In this perspective work, the challenging but equally important plasma–catalyst interaction is discussed, comparatively analyzing which type of plasma, catalyst bed, is the most promising. Representative plasma catalytic systems with their characteristic features are summarized, where the intrinsic capability of fluidized‐bed dielectric barrier discharge (FB‐DBD) reactor to maximize the plasma–catalyst interaction is highlighted. Furthermore, ongoing research on FB plasma catalysis is reviewed, based on which the superiority of FB‐DBD to other candidates, especially the most widely used packed‐bed DBD reactor, is critically evaluated. In addition, the perspectives of FB‐DBD, including challenges and development potential, are discussed.

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Effective generation of atmospheric pressure plasma in a sandwich-type honeycomb monolith reactor by humidity control

Cited by 32 publications

References 32 publications

High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

Influence of Potable Water Origin on the Physicochemical and Antimicrobial Properties of Plasma Activated Water

Plasma catalytic technology for CH₄ and CO₂ conversion: A review highlighting fluidized‐bed plasma reactor

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Effective generation of atmospheric pressure plasma in a sandwich-type honeycomb monolith reactor by humidity control

Cited by 32 publications

References 32 publications

High-Throughput NOx Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

High-Throughput NOx Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

Influence of Potable Water Origin on the Physicochemical and Antimicrobial Properties of Plasma Activated Water

Plasma catalytic technology for CH4 and CO2 conversion: A review highlighting fluidized‐bed plasma reactor

Contact Info

Product

Resources

About

High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

Plasma catalytic technology for CH₄ and CO₂ conversion: A review highlighting fluidized‐bed plasma reactor