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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Probing dynamic oxygen exchange for hydrogen production with operando neutron diffraction.

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Chemical looping reactors using perovskite materials achieve super-equilibrium conversions for reactions like water-gas shift. Operando neutron powder diffraction reveals reactor function and enables rapid material testing.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Catalysis

Background:

  • Chemical looping processes utilize ABO3-δ perovskites with variable oxygen content for enhanced reaction conversions.
  • The water-gas shift reaction (CO + H2O ⇌ CO2 + H2) is crucial for hydrogen production and can benefit from super-equilibrium conversion.
  • Reactor performance relies on an evolving oxygen chemical potential gradient within the bed.

Purpose of the Study:

  • To demonstrate the application of operando neutron powder diffraction for real-time monitoring of chemical looping reactors.
  • To investigate the functional mechanisms of perovskite-based reactors with high spatial and temporal resolution.
  • To enable rapid screening of novel materials for chemical looping applications and assess their long-term stability.

Main Methods:

  • Utilizing operando neutron powder diffraction to monitor the oxygen-sensitivity of perovskite materials within a reactor.
  • Achieving high spatial resolution (≲1 cm) and time resolution (≲30 s) in experimental observations.
  • Applying the memory reactor concept to both the water-gas shift and steam methane reforming reactions.

Main Results:

  • Operando neutron powder diffraction successfully revealed the reactor's functioning with unprecedented resolution.
  • The method allows for rapid testing of new high-capacity bed materials without prior thermodynamic data.
  • Direct insights into the long-term stability of reactor materials were obtained.

Conclusions:

  • Operando neutron powder diffraction is a powerful tool for understanding and optimizing chemical looping reactors.
  • The memory reactor concept, enabled by perovskite materials, offers a pathway to super-equilibrium conversions.
  • This approach is applicable to key reactions in hydrogen production, including steam methane reforming.