Mixed matrix membranes composed of two-dimensional metal–organic framework nanosheets for pre-combustion CO2 capture: a relationship study of filler morphology versus membrane performance

Abstract

A facile and scalable bottom-up method is used to synthesize a microporous jungle-gym-like metal–organic framework [Cu₂(ndc)₂(dabco)]_n in the morphologies of nanocubes and nanosheets. The obtained MOFs are blended with polybenzimidazole yielding a series of mixed matrix membranes (MMMs), which are evaluated for their performance in pre-combustion CO₂ capture (H₂/CO₂ separation). Pure gas permeation tests indicate that MMMs with partially oriented nanosheet MOFs possess the largest improvement compared with neat polymers, with the overall H₂/CO₂ separation performance exceeding the 2008 polymer upper bound.