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

authored by

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.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry

External Organisation(s)

Beijing University of Chemical Technology

Type

Article

Journal

Journal of Materials Chemistry A

Volume

6

Pages

16849-16853

No. of pages

5

ISSN

2050-7488

Publication date

21.08.2018

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Chemistry, Renewable Energy, Sustainability and the Environment, General Materials Science

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1039/c8ta05641b (Access: Closed)