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Microsensor Electrodes for 3D Inline Process Monitoring in Multiphase Microreactors.

Sebastian Urban1, Vinayaganataraj Tamilselvi Sundaram1, Jochen Kieninger1

  • 1Laboratory for Sensors, IMTEK – Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany.

Sensors (Basel, Switzerland)
|September 3, 2020
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Summary
This summary is machine-generated.

A novel electrochemical microsensor enables 3D monitoring of hydrogen peroxide synthesis in microreactors. This allows precise measurement of hydrogen peroxide and oxygen concentrations vertically within the channel for improved process control.

Keywords:
chronoamperometryelectrochemical sensorshydrogen peroxidemicroreactoroxygenprocess monitoring

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Area of Science:

  • Electrochemistry
  • Chemical Engineering
  • Materials Science

Background:

  • In situ monitoring of chemical reactions in microreactors is crucial for process optimization.
  • Previous electrochemical microsensors were limited to 2D measurements at the microchannel bottom.
  • Understanding gas distribution is key for direct synthesis reactions in microreactors.

Purpose of the Study:

  • To develop and implement a 3D electrochemical microsensor for monitoring hydrogen peroxide synthesis.
  • To enable in situ measurements along the vertical axis within a microreactor channel.
  • To investigate the spatial distribution of hydrogen peroxide and oxygen concentrations.

Main Methods:

  • Fabrication of a novel electrochemical microsensor with protruding electrodes.
  • Integration of the microsensor into a multiphase microreactor.
  • Calibration of the sensor for hydrogen peroxide and oxygen detection.
  • Performing 3D in situ measurements within the microreactor.

Main Results:

  • The new sensor design allows measurements along the vertical axis, from the channel bottom to the membrane.
  • Significantly increased gas concentrations were detected near the membrane compared to the channel bottom.
  • Demonstrated the importance of 3D measurements for understanding analyte distribution.

Conclusions:

  • The 3D electrochemical microsensor provides unprecedented spatial resolution for microreactor analysis.
  • Findings enhance understanding of diffusion and distribution of analytes in microreactors.
  • Enables better process control for hydrogen peroxide synthesis and similar reactions.