The removal of SO from flue gas remains a challenge. Adsorption-based separation of SO using porous materials has been proposed as a more energy-efficient and cost-effective alternative to more traditional methods such as cryogenic distillations. Here we report a flexible hydrogen-bonded organic framework (HOF-NKU-1) that enables the sieving of SO through the guest-adaptive response and shape-memory effect of the material. HOF-NKU-1 exhibits a high selectivity of 7,331 for the separation of SO/CO and a high SO storage density of 3.27 g cm within the pore space at ambient conditions. The hydrophobic nature of HOF-NKU-1 enables high dynamic SO uptake and SO recovery, even in conditions of 95% humidity. The SO/CO separation mechanism is studied through combinatorial gas sorption isotherms, breakthrough experiments and single-crystal diffraction studies, paving the way for the development of multifunctional shape-memory porous materials in the future.
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