Overcoming Thermal Degradation during Continuous Conversion of Water into Hydrogen Peroxide in a Flexible Plasma Reactor
Mery S. Hernandez, Yannis Mikolaiczyk, Sergey Soldatov, Guido Link, Lucas Silberer, Roland Dittmeyer, Alexander Navarrete
TL;DR
A flexible plasma reactor efficiently produces hydrogen peroxide from water while avoiding thermal degradation.
Contribution
A continuous process using plasma and water to produce hydrogen peroxide with minimal thermal degradation is developed.
Findings
Hydrogen peroxide concentrations up to 0.17 wt% were achieved with high energy efficiency.
Thermal degradation was minimized through plasma zone quenching.
Hydrogen peroxide formation is influenced by microwave pulse parameters and inversely related to water flow rate.
Abstract
By control of the nanosecond pulsation, energy input, and flow, it is possible to achieve commercial-level hydrogen peroxide (H2O2) concentrations using only water and plasma in a continuous process while minimizing thermal degradation. Time-resolved ultrafast Optical Emission Spectroscopy was employed to observe the formation of reactive species, shedding light on the underlying mechanisms. This study also found that thermal degradation has a critical role, which was effectively managed through quenching of the plasma zone. A parametric scan of pulse duration and pulse repetition frequency of the microwave power showed a significant influence on H2O2 formation, whereby the mean power also plays an important role. Additionally, the H2O2 concentration was found to be inversely proportional to the water flow rate. A maximum concentration of 0.17 wt % was achieved with 1.2 g/kWh based on…
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Taxonomy
TopicsPlasma Applications and Diagnostics · High-Temperature Coating Behaviors · Subcritical and Supercritical Water Processes