Surpassing Robeson Upper Limit for CO2/N2 Separation with Fluorinated Carbon Molecular Sieve Membranes

Abstract

Fluorinated membranes based on covalent triazine frameworks are prepared through rational design of aromatic nitrile monomers containing fluorine and ether groups via a sol-gel polymerization process. The CO 2 separation performance is markedly enhanced with the increase of fluorine content in the membrane. With functionalized triazine units, fluorine and ether groups, the carbon molecular sieve membranes obtained after pyrolysis exhibit intrinsic ultra-micropores, high surface areas, and outstanding CO 2 separation performance.

Carbon hollow fiber membranes for a molecular sieve with precise-cutoff ultramicropores for superior hydrogen separation

“…To et al 17 demonstrated Henry’s Law selectivity of CO 2 /N 2 for N-doped porous carbons increased from 9 to 124 when the N content was increased from 3.2 to 5.8 wt.%. Similarly, Yang et al 18 reported that the diffusion of CO 2 molecules through the membrane was improved by N- and F-containing nanodomains. As a corollary, it is inferred that CMS materials with a low heteroatom-content should reduce CO 2 sorption, and may provide an approach to achieve highly H 2 /CO 2 selective carbon membranes.…”

“…In addition to exploring carbonization conditions suitable for efficient H 2 /CO 2 separations with CMS membranes, the selection of suitable polymeric precursors is a crucial factor in achieving the desired membrane separation performance since precursor structures significantly affect the pore structures and properties of the derived CMS membranes 16 . It has been reported that increasing the doping content of heteroatoms, such as N, into carbon materials could enhance the CO 2 sorption capabilities, thereby providing highly CO 2 -selective materials 17 , 18 . To et al 17 demonstrated Henry’s Law selectivity of CO 2 /N 2 for N-doped porous carbons increased from 9 to 124 when the N content was increased from 3.2 to 5.8 wt.%.…”

A Solvent‐Polarity‐Induced Interface Self‐Assembly Strategy towards Mesoporous Triazine‐Based Carbon Materials

“…Tr iazine-based materials composed of aromatic triazine rings as linking units are an emerging materials class witnessing tremendous research interests in recent decades, which possess some unique physicochemical characteristics such as robust aromatic C=Nl inkage and interesting heteroatom aromatic effects endowed by conjugated and nitrogenrich frameworks. [1] In particularly,p orous triazine-based materials exhibit promising performance for many practical applications in gas adsorption and separation, [2] heterogeneous catalysis, [3] energy storage, [4] and photocatalysis, [5] due to their intrinsic porosity,a mple nitrogen content and high chemical stability.Over the past ten years,under the efforts of countless researchers,t he synthetic chemistry of porous triazine-based materials is developing rapidly in the fields of chemistry and material science.…”

A Solvent‐Polarity‐Induced Interface Self‐Assembly Strategy towards Mesoporous Triazine‐Based Carbon Materials

“…Tr iazine-based materials composed of aromatic triazine rings as linking units are an emerging materials class witnessing tremendous research interests in recent decades, which possess some unique physicochemical characteristics such as robust aromatic C=Nl inkage and interesting heteroatom aromatic effects endowed by conjugated and nitrogenrich frameworks. [1] In particularly,p orous triazine-based materials exhibit promising performance for many practical applications in gas adsorption and separation, [2] heterogeneous catalysis, [3] energy storage, [4] and photocatalysis, [5] due to their intrinsic porosity,a mple nitrogen content and high chemical stability.Over the past ten years,under the efforts of countless researchers,t he synthetic chemistry of porous triazine-based materials is developing rapidly in the fields of chemistry and material science.…”