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In Situ Mapping of H₂, O₂, and H₂O₂ in Microreactors: A Parallel, Selective Multianalyte Detection Method.

Sebastian Urban¹, Benedikt J Deschner², Laura L Trinkies²

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

|January 22, 2021

Summary

This summary is machine-generated.

This study presents a new electrochemical method for simultaneously monitoring hydrogen, oxygen, and hydrogen peroxide in microreactors. This technique enables precise, in situ analysis for optimized process control and safety in chemical synthesis.

Keywords:

electrochemical sensors hydrogen hydrogen peroxide microreactor oxygen process monitoring

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Area of Science:

Electrochemistry
Chemical Engineering
Analytical Chemistry

Background:

Accurate monitoring of reactants and products in microreactors is crucial for process optimization and safety.
Simultaneous detection of multiple analytes in microreactors presents significant challenges.
Electrochemical microsensors offer high spatial and temporal resolution for in situ measurements.

Purpose of the Study:

To develop a selective, parallel monitoring method for hydrogen, oxygen, and hydrogen peroxide in microreactors.
To enable in situ kinetic analysis of the hydrogen peroxide synthesis process.
To facilitate online process control through real-time analyte mapping.

Main Methods:

A chronoamperometric approach using a single platinum microelectrode in an aqueous electrolyte.
Utilizing three specific potentials for selective detection and subtraction of interfering currents.
Employing linear superposition of signals for simultaneous analyte quantification.

Main Results:

Selective detection of hydrogen, oxygen, and hydrogen peroxide was achieved.
Interfering currents were successfully subtracted, yielding accurate analyte concentrations.
Concentration measurements correlated well with results from non-interfering conditions.
The first-time mapping of hydrogen, oxygen, and hydrogen peroxide distribution in a microreactor was demonstrated.

Conclusions:

The developed electrochemical method allows for selective and simultaneous quantification of hydrogen, oxygen, and hydrogen peroxide.
This approach overcomes limitations in monitoring multianalyte environments within microreactors.
The ability to map analyte distribution paves the way for advanced online process control in microreactor systems.