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Enhanced CO2 sorption properties in a polarizable [WO2F4]2−-pillared physisorbent under direct air capture conditions
O'Nolan, D., Chatterton, L., Bellamy, T., Ennis, J. T., & Soukri, M. (2023). Enhanced CO2 sorption properties in a polarizable [WO2F4]2−-pillared physisorbent under direct air capture conditions. Chemical Communications, 59(77), 11540-11543. https://doi.org/10.1039/D3CC02749J, https://doi.org/10.1039/d3cc02749j
We report the CO2 capture properties of an ultramicroporous physisorbent [Ni(WO2F4)(pyrazine)(2)](n), WO2F4-1-Ni, which crystallizes in I4/mcm (a = 9.91785(6) angstrom, c = 15.71516(9) angstrom) and its structure is solved using laboratory X-ray powder diffraction. The WO2F4 anion is acentric with polarizable W=O bonds offering unique potential properties within a porous structure. Despite isostructural compounds being previously reported, the effect of this distorted anion on CO2 capture properties has not been studied. In this context, at a 400 ppm partial pressure of CO2 (applicable for direct air capture), this primitive cubic (pcu) network captures 0.934 mmol(CO2) g(sorbent)(-1) under dry conditions and 0.685 mmol(CO2) g(sorbent)(-1) at 75%RH, the highest capacity for a physisorbent reported to date.
