An azine-linked covalent organic framework ACOF-1 membrane for highly selective CO₂/CH₄ separation

verfasst von

Hongwei Fan, Alexander Mundstock, Jiahui Gu, Hong Meng, Jürgen Caro

Abstract

Covalent organic frameworks (COFs) are promising for constructing gas-separation membranes due to their versatile architectures, customizable functionalities and chemical stabilities. However, synthesis of continuous COF membranes still remains a challenge and rather underexplored. Herein, we present a two-dimensional (2D) azine-linked ACOF-1 membrane synthesized on a porous support by a solvothermal approach. The ACOF-1 membrane with a thickness of 8 μm shows a high selectivity of 86.3 in CO₂/CH₄ mixed gas separation with a favorable CO₂ permeance of about 9.9 × 10^-9 mol m^-2 s^-1 Pa^-1, and the overall performance exceeds the Robeson upper bound (2008). This surprising molecular sieving effect is attributed to an effective narrowing of the pore diameter (0.94 nm) owing to crystal intergrowth. A long-term test of gas permeation demonstrates the outstanding stability of the ACOF-1 membrane. These properties recommend the ACOF-1 membrane for CO₂ capture and other gas separations.

Organisationseinheit(en)

Institut für Physikalische Chemie und Elektrochemie

Externe Organisation(en)

Beijing University of Chemical Technology

Typ

Artikel

Journal

Journal of Materials Chemistry A

Band

6

Seiten

16849-16853

Anzahl der Seiten

5

ISSN

2050-7488

Publikationsdatum

21.08.2018

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Chemie, Erneuerbare Energien, Nachhaltigkeit und Umwelt, Allgemeine Materialwissenschaften

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1039/c8ta05641b (Zugang: Geschlossen)