High‐Performance Carbon Capture with Fluorine‐Tailored Carbon Molecular Sieve Membranes
Shan Xu, Guobao Li, Ruirui Yu, Pan Wang, Yunlong Ji
Abstract
Abstract Increasing energy consumption and climate change present an urgent global challenge to achieve carbon neutrality, with CO 2 capture as a top priority. Among various carbon capture technologies, CO 2 membrane separation stands out for its simplicity and energy efficiency in applications including gas purification and industrial gas recovery. Herein, a series of fluorine‐tailored porous carbon molecular sieve (CMS) membranes derived from precisely designed precursors, achieving a well‐balanced high permeability and selectivity for CO 2 separation are developed. Incorporating bent terphenyl monomers and both aliphatic/aromatic trifluoromethyl groups disrupted dense chain packing and promoted pore formation with enhanced permeability and selectivity for CO 2 separation. The TFM‐550 membrane, derived from a fluorinated stretched polymer backbone precursor, exhibits exceptional performance with a CO 2 permeability of 47 190 ± 3204 Barrer and a CO 2 /N 2 selectivity of 28.3 ± 5.7, while TFM‐800 presented a higher selectivity of 71.8 ± 11.5, surpassing the 2019 upper bound. Furthermore, under flue gas conditions (CO 2 /O 2 /N 2 = 1/1/4 in molar ratio), the CMS membrane demonstrate high CO 2 permeability of 36,204 ± 2,235 Barrer and outstanding CO 2 /N 2 selectivity of 35.3 ± 1.8. The results here highlight the effectiveness of fluorine tailoring and the potential of fluorinated CMS membranes for sustainable industrial carbon capture applications.