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Droplet-Based EPR Spectroscopy for Real-Time Monitoring of Liquid-Phase Catalytic Reactions.

Thomas Moragues1, Mikhail Agrachev2, Sharon Mitchell1

  • 1Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, Zürich, 8093, Switzerland.

Small Methods
|January 15, 2025
PubMed
Summary

A new microfluidic platform enables real-time Electron Paramagnetic Resonance (EPR) monitoring of catalytic reactions in nanoliter droplets. This method enhances reagent efficiency and catalyst analysis for both homogeneous and heterogeneous systems.

Keywords:
Droplet‐based microfluidicsin situ electron paramagnetic resonance spectroscopykinetic analysisliquid‐phase catalytic reactionsreal‐time monitoring

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Area of Science:

  • Chemical Kinetics
  • Catalysis Science
  • Spectroscopy

Background:

  • In situ monitoring provides critical data for catalytic process design, revealing active structures and intermediates.
  • Electron Paramagnetic Resonance (EPR) spectroscopy is vital for characterizing paramagnetic species during reactions.
  • Existing liquid-phase EPR methods face limitations, including high reagent consumption, custom equipment needs, and challenges with solid catalysts or initial kinetics.

Purpose of the Study:

  • To develop a droplet-based microfluidics platform for real-time in situ Electron Paramagnetic Resonance (EPR) monitoring of liquid-phase catalytic reactions.
  • To overcome the limitations of current liquid-phase EPR techniques, enhancing efficiency and applicability.

Main Methods:

  • A droplet-based microfluidics system was designed to encapsulate reactants within nanoliter droplets.
  • The platform allows precise control over mass transport and reagent consumption.
  • The system integrates with standard Electron Paramagnetic Resonance (EPR) spectrometers.

Main Results:

  • The microfluidic platform enables real-time EPR monitoring with reduced reagent usage and precise control over reaction conditions.
  • Demonstrated versatility in tracking dynamic ligand exchange in homogeneous catalysis and redox/radical kinetics in ascorbic acid oxidation.
  • Successfully monitored both supported and dissolved transition metal species, providing insights into catalyst deactivation mechanisms like metal leaching.

Conclusions:

  • The droplet-based microfluidic platform represents a significant advancement for in situ liquid-phase EPR measurements.
  • This approach offers a versatile and efficient tool for studying homogeneous and heterogeneous catalytic systems.
  • The method facilitates comprehensive analysis of catalytic processes, including kinetics, intermediates, and deactivation pathways.