High-performance ZIF-302 mixed-matrix membranes for efficient CO2 capture

• Published in: The Korean journal of chemical engineering Vol. 39; no. 4; pp. 1020 - 1027
• Main Authors: Qian, Junfeng, Song, Eryue, Lian, Haiqian, Jiang, Jinlong, Wang, Chongqing, Pan, Yichang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2022; Springer Nature B.V; 한국화학공학회
• Subjects: Addition polymerization; Biotechnology; Carbon dioxide; Carbon sequestration; Catalysis; Chemistry; Chemistry and Materials Science; Flue gas; Gas separation; Industrial Chemistry/Chemical Engineering; Materials Science; Membranes; Nanocrystals; Permeability; Polymers; Selectivity; Separation Technology; Structural stability; Thermodynamics; Topology; 화학공학; Mixed-matrix Membranes; MOFs; Gas Separation; CO; ZIF-302; Capture
• DOI: 10.1007/s11814-021-0968-0
• ISSN: 0256-1115

High-performance mixed matrix membranes (MMMs) were developed to assist in controlling global warming by capturing carbon dioxide (CO 2 ) from moist flue gas. However, the separation performance of MMMs has always been limited by gas permeability and long-term operating stability under humid conditions. ZIF-302 is a novel chabazite (CHA) topology structure with hydrophobic ligand. Herein, uniform ZIF-302 nanocrystals were doped into the P84 polymer matrix to synthesize different content of defect-free ZIF-302/P84 MMMs for CO 2 /N 2 separation. A significant combination of gas permeability and separation factors was found in MMMs with a ZIF-302 packing load of 30 wt%. The gas permeability of CO 2 and the separation factor of CO 2 /N 2 were significantly increased to 5.2 Barrers and 46, respectively, which breaks the trade-off between permeability and selectivity of the polymer membrane. In addition, the long-term operation stability showed that the separation performance of ZIF-302/P84 MMMs for CO 2 /N 2 was maintained more than 30 h at 3 bar and 60 °C. The main characteristics of the MMMs prepared in this paper include the combination of favorable structural stability under humid conditions and unaffected CO 2 /N 2 gas separation performance.