Metal‐induced polymer framework membrane <scp>w</scp>ith high performance for CO₂ separation

Abstract

In this study, a novel porous material, that is, metal‐induced polymer framework‐1 (MPF‐1) was synthesized using Zn(NO 3 ) 2 ·6H 2 O and a high‐molecular weight PVAmacid. MPF‐1 has two structural advantages that help to create CO 2 separation membranes with simple fabrication procedure and high performance. First, MPF‐1 is a high‐molecular weight polymer with certain flexibility, and thus having good membrane‐forming ability. Second, MPF‐1 has small and uniform distributed pores, and contains amine groups those can react with CO 2 molecules reversibly. Therefore, CO 2 molecules can preferentially adsorb on pore walls of MPF‐1 and transport across the pores by monomolecular surface diffusion, while most of N 2 , CH 4 , or H 2 molecules are excluded out the pores. The MPF‐1 was employed to fabricate a microporous membrane by coating the MPF‐1 dispersions on a polysulfone ultrafiltration membrane. CO 2 permeance and selectivity of the membrane keep almost unchanged with the feed pressure increasing from 0.11 to 1.0 MPa. © 2018 American Institute of Chemical Engineers AIChE J , 65: 239–249, 2019