Current CO separation technologies primarily rely on chemical adsorption/absorption,which face challenges such as difficult desorption and poor stability of active sites.In contrast with conventional open metal sites,quasi-open metal sites can utilize selective structural transformations to shield non-target guests and to reduce the difficulty of desorbing target guests.The structural transformation of crystalline adsorbents is generally understood as a cooperative/periodic behavior,which in principle cannot adsorb low-concentration target guests(leakage issues)and is not conducive to removal and purification purposes.Actually,even for crystal-to-crystal structural transformations,there is a small degree of aperiodicity.When the transformation pressure is sufficiently low,minor aperiodicity may be able to solve the leakage problem.According to practical demands,optimal separation performances may be achieved by proper tuning the cooperativity/periodicity of structural transformations or cooperation of adsorbents with typical periodic and aperiodic flexible behaviors.
关键词
多孔配位聚合物/框架柔性/准开放金属位点/纯化/稳定性
Key words
porous coordination polymer/framework flexibility/quasi-open metal site/purification/stability
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