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Hydrogen Production and Utilization in a Membrane Reactor
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Continuous hyperpolarization with parahydrogen in a membrane reactor.

Sören Lehmkuhl1, Martin Wiese2, Lukas Schubert1

  • 1Institute of Technical and Macromolecular Chemistry, Worringerweg 2, 52056 Aachen, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 7, 2018
PubMed
Summary

This study introduces a continuous flow setup for hyperpolarization using Signal Amplification by Reversible Exchange (SABRE). This method significantly enhances Nuclear Magnetic Resonance (NMR) sensitivity for molecules like pyridine and nicotinamide.

Keywords:
Continuous flowGas-liquid membrane reactorHyperpolarizationNMRParahydrogenSABRE

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Area of Science:

  • Magnetic Resonance Imaging
  • Hyperpolarization Techniques
  • Chemical Engineering

Background:

  • Nuclear Magnetic Resonance (NMR) sensitivity is crucial for molecular analysis.
  • Hyperpolarization methods, such as Signal Amplification by Reversible Exchange (SABRE), offer significant sensitivity boosts.
  • Current SABRE studies are often restricted to batch experiments, limiting their applicability.

Purpose of the Study:

  • To develop a continuous flow setup for SABRE hyperpolarization.
  • To integrate a membrane reactor for efficient para-hydrogen (p-H2) supply.
  • To enable real-time hyperpolarized detection using low-field NMR.

Main Methods:

  • Implementation of a continuous flow system with a membrane reactor for para-hydrogen (p-H2) delivery.
  • Utilizing a 1 Tesla (T) NMR spectrometer for detection.
  • Application of SABRE to pyridine and nicotinamide substrates.

Main Results:

  • Achieved over 1000-fold signal enhancement for pyridine and nicotinamide.
  • Demonstrated the feasibility of continuous flow SABRE hyperpolarization.
  • Established precise control over experimental parameters like pressure and flow rate.

Conclusions:

  • The developed continuous flow SABRE system overcomes limitations of batch experiments.
  • This approach enables repeatable, maximum polarization with enhanced NMR sensitivity.
  • The combination of low-field NMR and membrane flow reactors offers a powerful tool for hyperpolarization studies.