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Abstract
Abstract Rigid molecular sieve is highly desirable in industrial gas separation, but persistently challenged by sluggish adsorption within inherent rigidity‐confined narrow sieving pores. Herein, we report a rigid carbon‐based molecular sieve featuring ink‐bottle bimodal sub‐nanopores for the ideal fast sieving separation of propylene/propane mixture. The tailor‐made narrow pore entrance, centered at 5.0 Å, affords precise sieving capacity for propylene over propane with a high selectivity exceeding 200. Concurrently, the larger cavity located at 6.4 Å allows the exceptional fast adsorption kinetics of propylene. The measured diffusion coefficient of propylene (4.2 × 10–3 s−1) is one to two orders of magnitude higher than state‐of‐the‐art rigid molecular sieves and comparable to the non‐steric diffusion observed in mesoporous zeolite. High‐purity C3H6 production (>99.2%) is achieved in breakthrough experiments through a single adsorption–desorption cycle. This study paves an avenue to unlock rigid molecular sieves toward advanced separation of challenging gas analogues.
Published Version
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