Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7019903 | Journal of Membrane Science | 2018 | 22 Pages |
Abstract
Gas separation by metal-organic framework (MOF) membranes are still unsatisfactory due partly to unsatisfied separation characteristics caused by the trade-off between selectivity and permeability. Herein, we provide a facile post CO2 annealing method to remarkably improve both the permeance and separation factor of IRMOF-1 membranes for CO2 separation from CO2/H2 mixture. Post-treatment of the IRMOF-1 membrane by annealing at 100â¯Â°C under a high pressure CO2 stream deceases H2 permeance while increasing CO2 permeance, leading to simultaneous enhancement in both CO2/H2 separation factor from 721 up to 5781 and CO2 permeance from 5.67â¯Ãâ¯10â7 up to 9.38â¯Ãâ¯10â7 molâ¯mâ2 sâ1 Paâ1 at CO2 molar fraction of 98%, feed pressure of 5â¯atm and 298â¯K. The unusual separation behavior is related to the enhanced CO2 adsorption selectivity over H2 and reduced CO2 affinity of the membrane due to the formation of surface carbonate anions caused by the CO2 treatment. The proposed gas atmosphere post-treatment strategy opens a window for designing next generation MOF-related gas separation membranes.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Zebao Rui, Joshua B. James, Y.S. Lin,