Removal of Indoor Air Contaminant by Atmospheric Microplasma

Shimizu, Kazuo; Blajan, Marius; Kuwabara, Tomoya

doi:10.1109/ias.2010.5615990

Cited by 4 publications

(4 citation statements)

References 20 publications

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“…As previously reported in [11], the emission spectrum from the microplasma discharge in N 2 with water vapors when a high voltage amplifier was used to energize the electrodes, showed N 2 Second Positive System (N 2 SPS) peaks at 315.9, 337.1, 357.7, 367.2, 371.1, 375.5, 380.5, 394.3 nm that were observed due to electron collision [12–14], and OH peaks at 306.4 nm, 307.8 nm and 308.9 nm [15,16]. …”

Section: Resultssupporting

confidence: 75%

“…We reported in [11] that O radicals and OH radicals are the main species which are contributing to formaldehyde removal according to reactions (10) and (11). In both cases HCO results, which furthermore reacts with HCO (reaction 25) to give formaldehyde and CO or reacts with O 2 (reaction 17) to obtain HO 2 and CO. HO 2 is decomposed according to reactions (27) and (28):

{HO}_{2} + O \to OH + O_{2} k = 4.52 \times 10^{- 11}

{HO}_{2} + OH \to H_{2} O + O_{2} k = 8.00 \times 10^{- 11}

…”

Section: Resultsmentioning

confidence: 99%

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Study on Decomposition of Indoor Air Contaminants by Pulsed Atmospheric Microplasma

Shimizu

Kuwabara

Blajan

2012

Sensors

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Decomposition of formaldehyde (HCHO) by a microplasma reactor in order to improve Indoor Air Quality (IAQ) was achieved. HCHO was removed from air using one pass through reactor treatment (5 L/min). From an initial concentration of HCHO of 0.7 ppm about 96% was removed in one pass treatment using a discharge power of 0.3 W provided by a high voltage amplifier and a Marx Generator with MOSFET switches as pulsed power supplies. Moreover microplasma driven by the Marx Generator did not generate NOx as detected by a chemiluminescence NOx analyzer. In the case of large volume treatment the removal ratio of HCHO (initial concentration: 0.5 ppm) after 60 minutes was 51% at 1.2 kV when using HV amplifier considering also a 41% natural decay ratio of HCHO. The removal ratio was 54% at 1.2 kV when a Marx Generator energized the electrodes with a 44% natural decay ratio after 60 minutes of treatment.

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Section: Resultssupporting

confidence: 75%

{HO}_{2} + O \to OH + O_{2} k = 4.52 \times 10^{- 11}

{HO}_{2} + OH \to H_{2} O + O_{2} k = 8.00 \times 10^{- 11}

…”

Section: Resultsmentioning

confidence: 99%

Study on Decomposition of Indoor Air Contaminants by Pulsed Atmospheric Microplasma

Shimizu

Kuwabara

Blajan

2012

Sensors

Self Cite

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“…Several studies have used the emission spectrum of plasma discharge in N 2 with water vapor to predict the reaction kinetics associated with the decomposition of indoor air [27][28][29][30]. It has been suggested that the decomposition process commences with the formation of OH and H radicals as a result of the electron impact dissociation of H 2 O vapor [25,31].…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Indoor Formaldehyde Decomposition Performance of Atmospheric Plasma Reactor Utilizing Sensor Network

Tsay

Chiang

et al. 2015

International Journal of Distributed Sensor Networks

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An experimental investigation is conducted into the indoor formaldehyde decomposition performance of an atmospheric plasma reactor with an airflow rate of 200 L/s, discharge power of 50 W, and operating voltage of 8.5 kV, utilizing a sensor network. It is shown that, given an initial formaldehyde concentration of ∼0.2 ppm, the reactor removes 15∼80% of the formaldehyde at a height of 107 cm and 20∼73% at a height of 180 cm after 5.5 hours. Moreover, it is shown that, in decomposing the formaldehyde, the reaction process does not generate O 3 . Finally, it is shown that the reduction in the formaldehyde concentration is particularly significant near the outlet of the plasma reactor and between the reactor and the door.

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“…Microstrip split-ring resonator microwave-induced plasma sources (MSRR-MIPs) [1,2,3,4,5,6], have been proposed for integration in a wide variety of portable devices aimed for, e.g., chemical analysis systems [7,8], ion sources [9], sterilization or activation of substances [10,11]. Reasons for this are: their low power consumption, power efficiency, design simplicity, mechanical robustness, high density non-thermal plasma, long lifetime, and ability to operate at atmospheric pressure [4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a microplasma source based on a stripline split-ring resonator

Berglund¹,

Grudén²,

Thornell³

et al. 2013

Plasma Sources Sci. Technol.

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Abstract. In this paper, a stripline split-ring resonator microwave-induced plasma source, aimed for integration in complex systems, is presented and compared with a traditional microstrip design. Devices based on the two designs are evaluated using a plasma breakdown test setup for measuring the power required to ignite plasmas at different pressures. Moreover, the radiation efficiency of the devices is investigated with a Wheeler cap, and their electromagnetic compatibility is investigated in a variable electrical environment emulating an application. Finally, the basic properties of the plasma in the two designs are investigated in terms of electron temperature, plasma potential, and ion density. The study shows that, with a minor increase in plasma ignition power, the stripline design provides a more isolated and easy-to-integrate alternative to the conventional microstrip design. Moreover, the stripline devices showed a decreased antenna efficiency as compared to their microstrip counterparts, which is beneficial for plasma sources. Furthermore, the investigated stripline devices exhibited virtually no frequency shift in a varying electromagnetic environment, whereas the resonance frequency of their microstrip counterparts shifted up to 17.5%. With regards to the plasma parameters, the different designs showed only minor differences in electron temperature, whereas the ion density was higher with the stripline design.Keywords: Split-ring resonator, Microwave plasma, Microstrip, Stripline, Plasma, Wheeler cap, Langmuir probe

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Removal of Indoor Air Contaminant by Atmospheric Microplasma

Cited by 4 publications

References 20 publications

Study on Decomposition of Indoor Air Contaminants by Pulsed Atmospheric Microplasma

Study on Decomposition of Indoor Air Contaminants by Pulsed Atmospheric Microplasma

Experimental Evaluation of Indoor Formaldehyde Decomposition Performance of Atmospheric Plasma Reactor Utilizing Sensor Network

Evaluation of a microplasma source based on a stripline split-ring resonator

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