Metal–Organic Framework Crystal–Glass Composite Membranes with Preferential Permeation of Ethane

Author:

Ao De12ORCID,Yang Zibo13ORCID,Qiao Zhihua1ORCID,Sun Yuxiu1ORCID,Zhang Zhengqing1ORCID,Guiver Michael D.45ORCID,Zhong Chongli1ORCID

Affiliation:

1. State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin 300387 China

2. School of Materials Science and Engineering Tiangong University Tianjin 300387 China

3. College of Chemical Engineering and Materials Handan University Handan 056005 China

4. State Key Laboratory of Engines, School of Mechanical Engineering Tianjin University Tianjin 300072 China

5. National Industry-Education Platform of Energy Storage Tianjin University Tianjin 300072 China

Abstract

AbstractMetal–organic framework (MOF) glass is an easy to process and self‐supported amorphous material that is suitable for fabricating gas separation membranes. However, MOF glasses, such as ZIF‐62 and ZIF‐4 have low porosity, which makes it difficult to obtain membranes with high permeance. Here, a self‐supported MOF crystal–glass composite (CGC) membrane was prepared by melt quenching a mixture of ZIF‐62 as the membrane matrix and ZIF‐8 as the filler. The conversion of ZIF‐62 from crystal to glass and the simultaneous partial melting of ZIF‐8 facilitated by the melt state of ZIF‐62 make the CGC membrane monolithic, eliminating non‐selective grain boundaries and improving selectivity. The thickness of CGC membrane can be adjusted to fabricate a membrane without the need of a support substrate. CGC membranes exhibit a C2H6 permeance of 41 569 gas permeation units (GPU) and a C2H6/C2H4 selectivity of 7.16. The CGC membrane has abundant pores from the glassy state of ZIF‐62 and the crystalline ZIF‐8, which enables high gas permeance. ZIF‐8 has preferential adsorption for C2H6 and promotes C2H6 transport in the membrane, and thus the GCG membrane exhibits ultrahigh C2H6 permeance and good C2H6/C2H4 selectivity.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Publisher

Wiley

Subject

General Medicine

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