The development of adsorption-based separation processes alternative to the energy-intensive cryogenic distillation for a mixture of propylene and propane remains essential but challenging in gas industries. Molecular sieving separation of C₃H₆/C₃H₈ on stable carbon adsorbents appeals to be promising, while it is quite challenging to realize due to the random distributions and arrangements of the internal pores in common carbons. Herein, a series of polysaccharide-based CD-MOF-derived ultramicroporous carbon adsorbents with their pore size tuned at a subangstrom level were prepared. Molecular sieving separation of C₃H₆/C₃H₈ was realized on the optimal C-CDMOF-2-700 owing to the delicate structure with an appropriate pore size (5.0 Å). Besides, C-CDMOF-2-700 exhibited a high C₃H₆ uptake of 1.97 mmol g^–1 under ambient conditions. An ultrahigh uptake ratio of C₃H₆/C₃H₈ at 1.0 kPa (403) was also achieved, outperforming all reported adsorbents. Kinetic adsorption tests and breakthrough experiments further demonstrate this well-designed carbon adsorbent to be promising in industrial C₃H₆/C₃H₈ separation.

中文翻译：

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金属-有机骨架衍生的超微孔碳吸附剂中丙烷中丙烯的分子筛分

开发基于吸附的分离工艺替代丙烯和丙烷混合物的能源密集型低温蒸馏仍然是必不可少的，但在天然气工业中具有挑战性。_{C 3} H ₆ /C ₃ H ₈在稳定的碳吸附剂上的分子筛分离看起来很有前景，但由于普通碳内部孔隙的随机分布和排列，实现起来相当具有挑战性。在此，制备了一系列基于多糖的 CD-MOF 衍生的超微孔碳吸附剂，其孔径调整在亚埃水平。_{C 3} H ₆ /C ₃ H ₈的分子筛分离由于具有适当孔径（5.0 Å）的精细结构，在最佳 C-CDMOF-2-700 上实现了。此外，C-CDMOF-2-700在环境条件下表现出 1.97 mmol g ^{-1的高 C} ₃ H ₆吸收。_{还实现了在 1.0 kPa (403) 下 C 3} H ₆ /C ₃ H ₈的超高吸收率，优于所有报道的吸附剂。动力学吸附测试和突破性实验进一步证明了这种精心设计的碳吸附剂在工业 C ₃ H ₆ /C ₃ H ₈分离中的应用前景。