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Bioreactor Controls-I01:28

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Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly monitored using...

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Low-Power Tunable Micro-Plasma Device for Efficient and Scalable CO2 Valorization.

Bartu Karakurt1,2, Hongkeng Zhu1, Onder Soydal1

  • 1Institute of Electrical and Micro-engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH1015, Switzerland.

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Summary

This study presents a novel chip-based micro-plasma device for efficient carbon dioxide (CO2) conversion into chemical building blocks. The low-power system achieves high energy efficiency for CO2 splitting and dry reforming of methane, enabling sustainable chemical production.

Keywords:
CO2 valorizationenergy efficiencymicro‐plasmasustainability

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Area of Science:

  • Chemical Engineering
  • Plasma Physics
  • Sustainable Chemistry

Background:

  • Carbon dioxide (CO2) valorization is crucial for reducing carbon emissions.
  • Electrified processes offer a pathway for efficient chemical production.
  • Micro-plasma technology presents opportunities for scalable CO2 conversion.

Purpose of the Study:

  • To develop a chip-based micro-plasma device for tunable and efficient CO2 conversion.
  • To investigate the performance of different micro-plasma modes (arc, pulsed, pulsed arc) for CO2 splitting and dry reforming of methane (DRM).
  • To demonstrate a low-power, scalable, and sustainable solution for chemical production from CO2.

Main Methods:

  • Fabrication of a chip-based micro-plasma device capable of generating tunable plasma modes.
  • Utilizing nanosecond repetitively pulsed (NRP) micro-plasma for pure CO2 splitting.
  • Employing pulsed arc mode to enhance CO2 conversion kinetics.
  • Performing dry reforming of methane (DRM) using the developed device.

Main Results:

  • Achieved a peak energy efficiency of 29% for CO2 splitting with plasma powers below 1W.
  • Demonstrated a threefold increase in CO production using pulsed arc mode compared to pulsed mode.
  • Obtained a maximum energy efficiency of 33% for DRM with a syngas ratio near 1.
  • Showcased low-power consumption and high CO2 conversion across various concentrations (0.2%-21%).

Conclusions:

  • The chip-based micro-plasma device offers an efficient, low-power, and versatile platform for CO2 valorization.
  • Tunable micro-plasma modes, particularly pulsed arc, significantly enhance CO2 conversion.
  • The technology enables scalable, sustainable, and decentralized chemical production from CO2 and methane.