Study of plasma parameters and gas heating in the voltage range of nondischarge to full‐discharge in a methane‐fed dielectric barrier discharge

Pourali, Nima; Lai, Khuetian; Gregory, Joe; Gong, Yeong; Hessel, Volker; Rebrov, Evgeny V.

doi:10.1002/ppap.202200086

Cited by 7 publications

(6 citation statements)

References 36 publications

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“…This is likely because objects with sharper edges tend to have a higher charge density. [71] Enhancement of the electrical field and charge density in this reactor is calculated in the report of the Pourali et al [33] The μ-tip with similar characteristics is already employed as charged injectors in field emission devices.…”

Section: Optical Propertiesmentioning

confidence: 82%

“…Where T in the equation is for the time period (1/Frequency), I p is for plasma current, V p is for voltages across the plasma gap, I m is the monitoring current across in the current transformer and V s the total applied voltage. The calculations and further information can be found in the study conducted by Pourali et al [51] P…”

Section: Results and Discussion Electrical Propertiesmentioning

confidence: 99%

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Sustainable Plasma‐Catalytic Nitrogen Fixation with Pyramid Shaped μ‐Electrode DBD and Titanium Dioxide

Lamichhane,

Pourali,

Rebrov

et al. 2024

ChemistrySelect

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This research explores the potential of electric field enforcement in dielectric barrier discharge using specially designed pyramid‐shaped μ‐electrodes for a plasma‐assisted nitrogen fixation process. The obtained results are compared under varying conditions, including the presence and absence of titanium dioxide ( ), different oxygen concentrations in the nitrogen‐feeding gas, and residence time. The results demonstrate that the μ‐electrodes lead to an enhancement of nitrogen oxidation, which is further intensified by . The introduction of 60–70 % oxygen with nitrogen achieves the highest level of production. The synergistic effect of plasma and the catalytic effect of increase the rate of production by 20 %, resulting in a 23 % increase in energy yield. The introduction of leads to a sharp increase in production even at lower oxygen concentrations. The crucial role played by ultraviolet light‐induced electron‐hole pairs in is highlighted to promote nitrogen oxidation. Nevertheless, it is crucial to emphasize that prolonged residence times may cause the photocatalytic effect to generate alternative byproducts rather than , consequence of excessive oxidation that could prove counterproductive. These findings emphasize the potential of plasma‐assisted nitrogen fixation technology in reducing energy costs and meeting the growing demand for sustainable nitrogen‐based fertilizers.

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Section: Optical Propertiesmentioning

confidence: 82%

Section: Results and Discussion Electrical Propertiesmentioning

confidence: 99%

Sustainable Plasma‐Catalytic Nitrogen Fixation with Pyramid Shaped μ‐Electrode DBD and Titanium Dioxide

Lamichhane,

Pourali,

Rebrov

et al. 2024

ChemistrySelect

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“…The high heating at the tip of the pyramids causes a higher rotational temperature in the pyramid electrode DBD. High electric fields produce more heating due to the joule heating, [ 20 ] so near the sharp points there is more gas heating which results in more increase in rotational temperature. In pyramid electrode DBD, near the sharp point ions are accelerated due to the high intensity of the electric field and their drift velocity is high.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental set‐up was presented in our previous work. [ 20 ] A 400 pF external capacitor was connected to the ground line to monitor the generated electric charges (Q) in the plasma. A high‐voltage power generator (G2000 Redline Technologies) was used as an electrical power source that generates different amplitudes of the sinusoidal wave with various frequencies.…”

Section: Experimental Setup and Methodologymentioning

confidence: 99%

Nonoxidative methane coupling in a micro‐DBD with enhanced secondary electron emission

Pourali

Lamichhane

Hessel

et al. 2023

Plasma Processes & Polymers

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The conversion of methane into transportable and storable materials is crucial in the petrochemical sector. In this study, a specially constructed AC‐driven dielectric barrier discharge (DBD) that has charge injector pyramids on one of the electrodes and runs at ambient temperature and pressure was used to evaluate noncatalytic methane conversion. The obtained result was compared with the traditional flat electrode DBD. It was discovered that the product selectivity in direct nonoxidative methane conversion depended on the discharge conditions. Pyramid electrode plasma sources convert methane up to 50 more than flat electrode plasma due to the appearance of more microdischarges. Pyramid electrode plasma generally has a greater production efficiency than flat electrode plasma, while requiring more operational power. The turnkey solutions offered by the sustainable methane coupling method discussed here may be advantageous for the long‐term small‐scale ethylene exploration scenario.

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“…where A is the area of the electrode, 2.99⋅10 − 4 m 2 , T is the gas temperature and T s is the temperature of the electrode surface. In our previous studies, we recognized the need to characterize the temperature of the gas and therefore a detailed measurement of CO 2 rotational temperature in the micro DBD reactor was performed and correlated with the gas temperature [17,50]. It was concluded that Eq.…”

Section: Effect Of Discharge Gap Sizementioning

confidence: 99%

CO2 splitting in a micro DBD reactor with an electrode containing charge injector parts

Khunda,

Li,

Cherkasov

et al. 2023

Preprint

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The CO splitting reaction has been investigated in a plate-to-plate micro DBD reactor with a high voltage electrode having pyramid charge injection points. The presence of sharp points (pyramids) creates zones with enhanced electric field around them. The minimum discharge voltage in the pyramid micro DBD reactor reduced from 6.5 to 5.2 kV (peak-to-peak). At the same time, the CO2 conversion increased 1.5 times as compared to that in the reactor with a flat electrode. Lowering the discharge gap from 0.50 to 0.25 mm resulted in more intense microdischarges, further increasing CO2 conversion by 1.3 times. At the same time, the energy efficiency increased further by 1.3 times. There exists an optimum residence time of 0.5 ms as a result of an interplay between plasma contact time and flow non-uniformity. The highest energy efficiency of 20% was obtained at a 3 W power, achieving a CO2 conversion of 16%.

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Study of plasma parameters and gas heating in the voltage range of nondischarge to full‐discharge in a methane‐fed dielectric barrier discharge

Cited by 7 publications

References 36 publications

Sustainable Plasma‐Catalytic Nitrogen Fixation with Pyramid Shaped μ‐Electrode DBD and Titanium Dioxide

Sustainable Plasma‐Catalytic Nitrogen Fixation with Pyramid Shaped μ‐Electrode DBD and Titanium Dioxide

Nonoxidative methane coupling in a micro‐DBD with enhanced secondary electron emission

CO2 splitting in a micro DBD reactor with an electrode containing charge injector parts

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