Identification of bridged CO2 binding in a Prussian blue analogue using neutron powder diffraction

Abstract

Neutron powder diffraction measurements were carried out on the evacuated and CO₂-loaded Prussian blue analogue, Fe₃[Co(CN)₆]₂, identifying two distinct CO₂ adsorption sites: site A, in which CO₂ uniquely bridges between two bare-metal sites, and site B, in which it interacts in a face capping motif. The saturation of site A at low loadings of CO₂ demonstrates the favourable nature of the interaction of CO₂ with bare-metal sites within the material.