Unobstructed Ultrathin Gas Transport Channels in Composite Membranes by Interfacial Self‐Assembly

Abstract

Ultrathin unobstructed gas transport channels through the membrane selective layer are constructed in mixed matrix membranes (MMMs) by using gravity-induced interface self-assembly of poly(vinylamine) and polymer-modified MIL-101(Cr). For CO₂ /N₂ (15/85 by volume) mixed gas, the MMMs achieve a high CO₂ permeance of 823 gas permeation units and CO₂ /N₂ selectivity of 242 at 0.5 MPa. Based on economic analyses, a two-stage membrane process can achieve gas separation and economic targets.