吸附
膜
气体分离
分子筛
微型多孔材料
聚合物
材料科学
碳纤维
化学工程
高分子科学
吸附
化学
有机化学
工程类
复合材料
复合数
生物化学
作者
Oishi Sanyal,Samuel S. Hays,Nicholas E. León,Yoseph A. Guta,Arun K. Itta,Ryan P. Lively,William J. Koros
标识
DOI:10.1002/anie.202006521
摘要
Demand for energy-efficient gas separations exists across many industrial processes, and membranes can aid in meeting this demand. Carbon molecular sieve (CMS) membranes show exceptional separation performance and scalable processing attributes attractive for important, similar-sized gas pairs. Herein, we outline a mathematical and physical framework to understand these attributes. This framework shares features with dual-mode transport theory for glassy polymers; however, physical connections to CMS model parameters differ from glassy polymer cases. We present evidence in CMS membranes for a large volume fraction of microporous domains characterized by Langmuir sorption in local equilibrium with a minority continuous phase described by Henry's law sorption. Using this framework, expressions are provided to relate measurable parameters for sorption and transport in CMS materials. We also outline a mechanism for formation of these environments and suggest future model refinements.
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