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Stabilizing Frustrated Phase Transitions in Selective Oxidation Reactions.

Luis Sandoval-Diaz1,2, Thomas Götsch1, Daniel Cruz1

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Summary
This summary is machine-generated.

Adding water stabilizes frustrated phase transitions in cobalt oxide catalysts for 2-propanol oxidation. This strategy enhances acetone selectivity and catalyst lifetime by mitigating vacancy mobility.

Keywords:
frustrated phase transitionoperando spectromicroscopyselective oxidationselectivity control

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Frustrated phase transitions are crucial for optimal heterogeneous catalyst performance but are difficult to stabilize.
  • These states are often transient and exist within narrow operational windows.

Purpose of the Study:

  • To investigate the stabilization of frustrated phase transitions in cobalt oxide (Co3O4) spinels for 2-propanol selective oxidation.
  • To understand the role of water as a co-reactant in extending catalyst stability and selectivity.

Main Methods:

  • Operando scanning electron microscopy (OSEM)
  • Near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS)
  • Transmission electron microscopy (TEM)
  • Computer vision analysis

Main Results:

  • The most selective state for acetone formation involves a dynamic spinel structure with reversible redox processes.
  • At higher temperatures, this metastable state transitions to a less selective rock-salt CoO phase via mobile vacancies.
  • Water vapor addition was found to mitigate vacancy mobility, stabilizing the desired frustrated spinel phase.

Conclusions:

  • Water vapor acts as a stabilizer for the catalytically active frustrated phase transition in Co3O4 spinels.
  • This stabilization enhances acetone selectivity and extends catalyst lifetime by preventing phase transition to inactive phases.
  • The study proposes a strategy of co-reactant addition to prolong catalyst operational life.