Optimum conditions for ozone formation in a micro dielectric barrier discharge

Sung, Youl-Moon; Sakoda, Tatsuya

doi:10.1016/j.surfcoat.2004.09.031

Cited by 72 publications

(33 citation statements)

References 7 publications

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“…It has been noted [4] that the ozone generation rate rises proportionally with increasing frequency if excessive gas heating is avoided. The simplest way to suppress gas heating by the discharge is the use of external water cooling [4,9]. In our case, the power modulation partially helps keep the gas heating under control and no water cooling is therefore required.…”

Section: Discussionmentioning

confidence: 99%

“…To our best knowledge, the highest ozone production yield exceeding 400 g/kWh with high ozone concentrations 10-12 9 10 3 ppm (*20-25 g/m 3 ) was reported by Sung and Sakoda [9]. They used a volume DBD with a short gaseous gap (0.2-0.8 mm) using quartz glass, water-cooled electrodes, oxygen flow rates of 1-3 slm, and pseudo-sinusoidal AC excitation with positive and negative half-periods (duration *10 ls each) separated by a *60 ls high voltage cut-off period.…”

mentioning

confidence: 84%

“…Ozone generation efficiency has been widely studied in laboratory conditions and performance has been reported for systems based on pulsed corona discharges and various dielectric barrier discharges [4][5][6][7][8][9][10][11]. For example, more than 20 years ago, Masuda et al [4] reported a surface continuously AC excited (10 kHz and 10 kV peak-to-peak) dielectric barrier discharge (DBD) ozoniser based on a high-purity alumina ceramic with parallel strip-like discharge electrodes and a grounded water-cooled film-like induction electrode capable of producing ozone concentration as high as 5-10 9 10 4 ppm.…”

mentioning

confidence: 99%

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Influence of Power Modulation on Ozone Production Using an AC Surface Dielectric Barrier Discharge in Oxygen

Šimek

Pekárek

Prukner

2010

Plasma Chem Plasma Process

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The measurements of electro-optical discharge characteristics and concentration of produced ozone were performed to evaluate the efficiency of ozone production in an AC surface dielectric barrier discharge (SDBD) in pure oxygen at atmospheric pressure. The discharge was driven in an amplitude-modulated regime with a driving AC frequency of 1 kHz, variable discharge duty cycle of 0.01-0.8 and oxygen flow rate of 2.5-10 slm. We observed asymmetric SDBD behaviour as evidenced by the variation in the ratio of the O I /O 2 ? emission intensities registered during the positive/negative half-periods and complemented by the transferred charge measurements through the Lissajous figures. We also found a strong dependence of O 3 concentration on the discharge duty cycle. The highest calculated ozone production yield reached 170 g/kWh with a corresponding energy cost of about 10 eV/molecule when combining the lowest inspected duty cycle with the lowest AC high voltage amplitude.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 84%

mentioning

confidence: 99%

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Influence of Power Modulation on Ozone Production Using an AC Surface Dielectric Barrier Discharge in Oxygen

Šimek

Pekárek

Prukner

2010

Plasma Chem Plasma Process

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“…The O 3 requirement was 160 or 330 g, respectively [4]. The generation of 160 or 330 g of ozone requires an electrical energy of 3.8 or 7.87 MJ, respectively [18]. Combustion of 180 or 208 g ethanol releases 4.82 or 5.56 MJ (lower heating values of ethanol), respectively.…”

Section: Ozone Cost Estimationmentioning

confidence: 99%

Plasma-Assisted Pretreatment of Wheat Straw for Ethanol Production

Schultz-Jensen

Kádár

Thomsen

et al. 2011

Appl Biochem Biotechnol

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The potential of wheat straw for ethanol production after pretreatment with O(3) generated in a plasma at atmospheric pressure and room temperature followed by fermentation was investigated. We found that cellulose and hemicellulose remained unaltered after ozonisation and a subsequent washing step, while lignin was degraded up to 95% by O(3). The loss of biomass after washing could be explained by the amount of lignin degraded. The washing water of pretreated samples (0-7 h) was analyzed for potential fermentation inhibitors. Approximately 30 lignin degradation products and a number of simple carboxylic acids and phenolic compounds were found, e.g., vanillic acid, acetic acid, and formic acid. Some components had the highest concentration at the beginning of the ozonisation process (0.5, 1 h), e.g., 4-hydroxybenzladehyde, while the concentration of others increased during the entire pretreatment (0-7 h), e.g., oxalic acid and acetovanillon. Interestingly, washing had no effect on the ethanol production with pretreatment times up to 1 h. Washing improved the glucose availability with pretreatment times of more than 2 h. One hour of ozonisation was found to be optimal for the use of washed and unwashed wheat straw for ethanol production (maximum ethanol yield, 52%). O(3) cost estimations were made for the production of ethanol at standard conditions.

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“…The power requirement for O 3 generation depends on the discharge parameters such as the distance between electrodes, O 3 concentration, and feed gas composition as described by Sung [25]. According to his finding, with air as feed gas, the O 3 content is 0.8% at 150 g/kWh, but this energy consumption is only for the discharge.…”

Section: Cost Calculationmentioning

confidence: 99%

Plasma-Assisted Pretreatment of Wheat Straw

Schultz-Jensen

Leipold

Bindslev

et al. 2010

Appl Biochem Biotechnol

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O₃ generated in a plasma at atmospheric pressure and room temperature, fed with dried air (or oxygen-enriched dried air), has been used for the degradation of lignin in wheat straw to optimize the enzymatic hydrolysis and to get more fermentable sugars. A fixed bed reactor was used combined with a CO₂ detector and an online technique for O₃ measurement in the fed and exhaust gas allowing continuous measurement of the consumption of O₃. This rendered it possible for us to determine the progress of the pretreatment in real time (online analysis). The process time can be adjusted to produce wheat straw with desired lignin content because of the online analysis. The O₃ consumption of wheat straw and its polymeric components, i.e., cellulose, hemicellulose, and lignin, as well as a mixture of these, dry as well as with 50% water, were studied. Furthermore, the process parameters dry matter content and milled particle size (the extent to which the wheat straw was milled) were investigated and optimized. The developed methodology offered the advantage of a simple and relatively fast (0.5-2 h) pretreatment allowing a dry matter concentration of 45-60%. FTIR measurements did not suggest any structural effects on cellulose and hemicellulose by the O₃ treatment. The cost and the energy consumption for lignin degradation of 100 g of wheat straw were calculated.

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Optimum conditions for ozone formation in a micro dielectric barrier discharge

Cited by 72 publications

References 7 publications

Influence of Power Modulation on Ozone Production Using an AC Surface Dielectric Barrier Discharge in Oxygen

Influence of Power Modulation on Ozone Production Using an AC Surface Dielectric Barrier Discharge in Oxygen

Plasma-Assisted Pretreatment of Wheat Straw for Ethanol Production

Plasma-Assisted Pretreatment of Wheat Straw

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