Functional relationship between material property, applied frequency and ozone generation for surface dielectric barrier discharges in atmospheric air

Portugal, Sherlie; Roy, Subrata; Lin, Jenshan

doi:10.1038/s41598-017-06038-w

Cited by 43 publications

(34 citation statements)

References 20 publications

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“…A key element for the efficient production of ozone is the waveform with which the power is applied [6,7]. This is typically sinusoidal with frequencies ranging from 10 to 100 kHz, with the frequency being a key factor in ozone production too [8][9][10]. Higher frequencies allow for higher power density and thus ozone concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the voltage waveform’s shape and on-time duration on the dissolved ozone produced by a DBD bubble reactor

Seri

Wright

Shaw

et al. 2019

Plasma Sources Sci. Technol.

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In this study we examine both the effect of changing the applied voltage waveform shape and the modulation on-time on the amount of ozone dissolved within a liquid in a DBD bubble reactor. In this device, the discharge forms at the gas liquid interface allowing for effective transfer of the plasma effluent into the liquid. To produce different voltage waveforms, a multilevel inverter power supply capable of generating arbitrary waveforms without switching-on and switching-off transients has been used. Of the four waveforms used in the study (sinusoidal, sawtooth, square and short-pulse), the square waveform was found to be the most efficient at producing the highest ozone concentration for a fixed peak voltage and average power. To determine the effect of the modulation on-time, the number of cycles during the on-time were increased from 1 up to 1000, adjusting the off-time accordingly to maintain the same duty cycle. Shorter on-time periods were found to be more efficient. Experimental and computational results indicate that the time between subsequent discharges is critical for increased ozone generation efficacy, as this needs to be long enough for ozone produced in one discharge event to diffuse away from the discharge region before the next discharge event occurs, thereby avoiding its partial destruction in the plasma. This insight provides a valuable criterion for the optimization of DBD reactors used in novel biomedical, agricultural and environmental applications.

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Section: Introductionmentioning

confidence: 99%

“…However, it cannot be assumed that this leads to higher efficiency as several studies point towards improved efficiency at lower frequencies. The optimal frequency is typically system and process dependent [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of the voltage waveform’s shape and on-time duration on the dissolved ozone produced by a DBD bubble reactor

Seri

Wright

Shaw

et al. 2019

Plasma Sources Sci. Technol.

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“…Taking into account the relatively low energy efficiency of the plasma ammonia synthesis as compared to the conventional process (as discussed in Supporting Information), the additional scenario of recovering part of the provided energy to the plasma reactor in the form of steam has been incorporated. The latter consideration has been made on the basis of literature reports referring to high amount of the provided electricity being allocated to the heating of the discharge barriers (Kappes, Schiene, & Hammer, 2002; Kogelschatz, 2003; Portugal, Roy, & Lin, 2017). Based on that, the possibility of by‐passing water through the walls of the plasma reactor, where heat could be potentially accumulated and energy could be, in turn, recovered, has been theoretically explored.…”

Section: Methodology and Approachmentioning

confidence: 99%

Environmental impact assessment of plasma‐assisted and conventional ammonia synthesis routes

Anastasopoulou

Keijzer

Patil

et al. 2020

J of Industrial Ecology

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The importance of ammonia in the fertilizer industry has been widely acknowledged over the past decades. In view of the upcoming increase of world population and, in turn, food demand, its production rate is likely to increase exponentially. However, considering the high dependence on natural resources and the intensive emission profile of the contemporary ammonia synthesis route, as well as the rigid environmental laws being enforced at a global level, the need to develop a sustainable alternative production route becomes quite imperative. A novel approach toward the synthesis of ammonia has been realized by means of non-thermal plasma technology under ambient operating conditions. Because the given technology is still under development, carrying out a life cycle assessment (LCA) is highly recommended as a means of identifying areas of the chemical process that could be potentially improved for an enhanced environmental performance. For that purpose, in the given research study, a process design for a small-scale plasma-assisted ammonia plant is being proposed and evaluated environmentally for specific design scenarios against the conventional ammonia synthesis employing steam reforming and water electrolysis for hydrogen generation. On the basis of the LCA results, the most contributory factor to the majority of the examined life cycle impact categories for the plasma-assisted process, considering an energy efficiency of 1.9 g NH 3 /kWh, is the impact of the power consumption of the plasma reactor with its share ranging from 15% to 73%. On a comparative basis, the plasma process powered by hydropower has demonstrated a better overall environmental profile over the two benchmark cases for the scenarios of a 5% and 15% NH 3 yield and an energy recovery of 5% applicable to all examined plasma power consumption values.

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“…Also known as a silent discharge, DBD has been experimentally investigated for more than a hundred years. DBD has been applied extensively in various technical aspects, including pollution control [93,94], surface modification [95,96], sterilization, using water as an electrode and for cooling [97,98], chemical vapor deposition, ultraviolet excimer lamps, bio treatment of microorganisms [99][100][101], ozone generation [102,103], and the decomposition of CO 2 [104]. A typical DBD reactor has two electrodes asymmetrically positioned on both sides of a dielectric barrier material, such as quartz, glass, ceramic material or polymers [105].…”

Section: Dielectric Barrier Dischargementioning

confidence: 99%

A Review of Non-Thermal Plasma Technology: A novel solution for CO2 conversion and utilization

Adwek

Shen

Craven

et al. 2021

Renewable and Sustainable Energy Reviews

288

136

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Recently, carbon dioxide (CO 2 ) conversion into higher-value platform chemicals and synthetic fuels has drawn great attention as a result of global warming. Non-thermal plasma (NTP)-catalytic CO 2 conversion has emerged to significantly reduce the reaction temperature. However, this technology requires a paradigm shift in process design to enhance plasma-catalytic performance. CO 2 conversion using NTP and catalysts has great potential to increase reaction efficiencies due to the synergetic effects between the plasma and catalysts that can provide mutual improvement in their performances. It is crucial to present the recent progress in CO 2 conversion and utilization whilst specifying a research prospects framework and providing future research directions in both industries and laboratories.Herein, a review of encouraging research achievements in CO 2 conversion and utilization using NTP in recent years is provided. The topics reviewed in this work are recent progress in different NTP sources in relation to product selectivity, conversion, and energy efficiency; plasma-based CO 2 reactions and applications; CO 2 conversion integrated with CO 2 capture; and process development of NTP in terms of potential large-scale applications processes. The high market value of the possible products from the NTP process, including chemicals and fuels, make the commercialization of the process feasible. Developing a suitable catalyst with effective sensitivities and performance under intricate conditions can improve the selectivity of these carbon-based liquid chemicals. There is a need for more studies to be performed in this field.

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Functional relationship between material property, applied frequency and ozone generation for surface dielectric barrier discharges in atmospheric air

Cited by 43 publications

References 20 publications

Influence of the voltage waveform’s shape and on-time duration on the dissolved ozone produced by a DBD bubble reactor

Influence of the voltage waveform’s shape and on-time duration on the dissolved ozone produced by a DBD bubble reactor

Environmental impact assessment of plasma‐assisted and conventional ammonia synthesis routes

A Review of Non-Thermal Plasma Technology: A novel solution for CO2 conversion and utilization

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