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Carbon dioxide (CO2) interacts with copper oxide clusters, showing charge state, not size, dictates CO2 activation. This suggests CO2 hydrogenation likely proceeds via formate or bicarbonate intermediates.

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Area of Science:

  • Surface science
  • Computational chemistry
  • Spectroscopy

Background:

  • Copper oxide clusters are relevant in catalysis and materials science.
  • Understanding CO2 interaction with metal oxides is crucial for carbon capture and utilization.

Purpose of the Study:

  • Investigate CO2 interaction with copper oxide clusters of varying size, composition, and charge.
  • Determine factors influencing CO2 activation and potential reaction pathways.

Main Methods:

  • Infrared multiple-photon dissociation (IR-MPD) spectroscopy to probe cluster-CO2 complexes.
  • Density functional theory (DFT) calculations to model interactions and reaction mechanisms.

Main Results:

  • Oxygen-rich cations and stoichiometric/oxygen-deficient anions formed.
  • CO2 binds non-activated to cations, but is activated by anions.
  • Activation is independent of cluster size/composition, primarily dependent on charge state.
  • CO2 activation leads to CO3 unit formation; CO dissociation is unfavorable.

Conclusions:

  • Cluster charge state is the key factor for CO2 activation by copper oxide clusters.
  • Potential hydrogenation reactions of CO2 likely involve formate or bicarbonate intermediates.