A Calcium Coordination Framework Having Permanent Porosity and High CO₂/N₂ Selectivity

A thermally stable, microporous calcium coordination network shows a reversible 5.75 wt % CO2 uptake at 273 K and 1 atm pressure, with an enthalpy of interaction of ∼31 kJ/mol and a CO2/N2 selectivity over 45 under ideal flue gas conditions. The absence of open metal sites in the activated material suggests a different mechanism for selectivity and high interaction energy compared to those for frameworks with open metal sites.一种热稳定的微孔钙配位网络，在273 K、1个大气压条件下可实现5.75 wt%的可逆二氧化碳吸附量，其相互作用焓约为31 kJ/mol，且在理想烟气工况下二氧化碳/氮气选择性超过45。该活化材料中不存在开放金属位点，这表明其实现选择性与高相互作用能的机制，与含开放金属位点的框架材料截然不同。