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Title: Benchmark CO2 separation achieved by highly fluorinated nanoporous molecular sieve membranes from nonporous precursor via in situ cross-linking

Journal Article · · Journal of Membrane Science

Molecular sieve membranes with rigid micropores and CO2-philic functionalities within the architectures are promising candidates in CO2 separation. However, the development of ctieve approaches for their fabrication still remains a significant challenge. In this study, an in situ cross-linking strategy is developed for the preparation of nanoporous fluorinated moleffecular sieve membranes using commercially available dense and non-porous polystyrene (MPS) as a precursor template. Based on the dehydrative Friedel-Crafts reactions with highly fluorinated benzylic alcohols, MPS membranes are cross-linked in situ upon exposure to Brønsted acid (CF3SO3H), affording fluorinated microporous polymeric membranes with surface areas up to 523 m2 g–1 and the presence of micropores centered at 1.1–1.3 nm as well as ultra-micropores (~0.6 nm). The obtained modified membranes exhibit good ideal CO2 permeability of 797 barrer and CO2/N2 selectivity of 28.5. In addition, high fluorine content (up to 28.5 wt%) and good thermal stability made the cross-linked membranes promising candidates to produce fluorinated carbon molecular sieve membranes with improved textural properties, exhibiting surface areas up to 1020 m2 g–1 and ultra-micropores of ~0.4 nm. These membranes achieve superior CO2/N2 separation performances exceeding the Robeson upper bound limit (2008).

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC02-07CH11358
OSTI ID:
1814265
Alternate ID(s):
OSTI ID: 1817629; OSTI ID: 1868614
Report Number(s):
IS-J-10,566
Journal Information:
Journal of Membrane Science, Vol. 638; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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