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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Climate Change Mitigation

Background:

  • Direct air capture (DAC) of carbon dioxide (CO2) is crucial for mitigating climate change.
  • Alkaline inorganic metal oxides are investigated for CO2 capture via DAC.
  • Metastable early transition metal peroxide molecules offer a novel pathway for CO2 stabilization.

Purpose of the Study:

  • To investigate the CO2 capture and stabilization mechanisms of early d0 transition metal peroxide molecules, specifically tetraperoxovanadates (A3V(O2)4).
  • To elucidate the role of alkali metals (A = K, Rb, Cs) in the stability and reactivity of these compounds during DAC.
  • To characterize the conversion products and reaction pathways involved in CO2 capture and release.

Main Methods:

  • Experimental techniques including single crystal X-ray diffraction, infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD), 51V solid-state NMR, tandem thermogravimetry-mass spectrometry (TGA-MS), and Electron Paramagnetic Resonance (EPR) Spectroscopy.
  • Computational studies using density functional theory (DFT).
  • Wet chemical assays to determine the presence of adventitious superoxide.

Main Results:

  • Tetraperoxovanadates (A3V(O2)4) convert to monocarbonate (VO(O2)2(CO3)3-) and ultimately bicarbonate (HKCO3) and metavanadate (KVO4) upon CO2 exposure.
  • Single crystal X-ray structures of rubidium and cesium tetraperoxovanadate were determined.
  • CO2 capture and release mechanisms involve the vanadium center, with alkali metals significantly impacting compound stability (K > Rb > Cs).
  • All compounds captured approximately two equivalents of CO2 per vanadium center.
  • Evidence of ~5% adventitious superoxide was found, likely formed by peroxide reduction of vanadium.

Conclusions:

  • Early transition metal peroxide molecules, like tetraperoxovanadates, demonstrate potential for direct air capture of CO2.
  • The alkali metal cation plays a critical role in the stability and reactivity of these peroxovanadate compounds.
  • This study provides a foundation for developing peroxide-functionalized metal oxides for efficient DAC technologies.