Plasmochemical Synthesis of Optically Active Substances

This study concerns the production of hydrogen from a mixture of ethanol and water. The process was conducted in plasma generated by a spark discharge. The substrates were introduced in the liquid phase into the reactor. The gaseous products formed in the spark reactor were hydrogen, carbon monoxide, carbon dioxide, methane, acetylene, and ethylene. Coke was also produced. The energy efficiency of hydrogen production was 27 mol(H2)/kWh, and it was 36% of the theoretical energy efficiency. The high value of the energy efficiency of hydrogen production was obtained with relatively high ethanol conversion (63%). In the spark discharge, it was possible to conduct the process under conditions in which the ethanol conversion reached 95%. However, this entailed higher energy consumption and reduced the energy efficiency of hydrogen production to 8.8 mol(H2)/kWh. Hydrogen production increased with increasing discharge power and feed stream. However, the hydrogen concentration was very high under all tested conditions and ranged from 57.5 to 61.5%. This means that the spark reactor is a device that can feed fuel cells, the power load of which can fluctuate.

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Efficient Plasma Technology for the Production of Green Hydrogen from Ethanol and Water

Ulejczyk

Nogal

Młotek

et al. 2022

Energies

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Rotary pump using underwater electrical discharge

Sugioka,

Sumida,

Matsuo

2024

Jpn. J. Appl. Phys.

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Powerful micropumps and water sterilization are essential for biomedical applications using microfluidic circuits. Therefore, we propose a rotary pump using underwater electrical discharge for water sterilization and elucidate its design concept. Specifically, we demonstrate that by applying high-voltage pulses repeatedly, the rotary device having an asymmetrical antenna structure can rotate with the maximum angular velocity of ~25 rad/s, and can produce a net flow with an average velocity of $\sim$3.2 mm/s along with an instantaneous maximum flow of ~9 mm/s. In addition, we explain our experimental results fairly well by proposing a simple model that considers the effects of asymmetricity and electric field strength with a steric effect. Our findings should contribute to the microfluidics for biomedical applications.

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Plasmochemical Synthesis of Optically Active Substances

Cited by 2 publications

References 11 publications

Efficient Plasma Technology for the Production of Green Hydrogen from Ethanol and Water

Efficient Plasma Technology for the Production of Green Hydrogen from Ethanol and Water

Rotary pump using underwater electrical discharge

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