Highly efficient separation of carbon dioxide by a metal-organic framework replete with open metal sites.
Selective capture of CO(2), which is essential for natural gas purification and CO(2) sequestration, has been reported in zeolites, porous membranes, and amine solutions. However, all such systems require substantial energy input for release of captured CO(2), leading to low energy efficiency and high cost. A new class of materials named metal-organic frameworks (MOFs) has also been demonstrated to take up voluminous amounts of CO(2). However, these studies have been largely limited to equilibrium uptake measurements, which are a poor predictor of separation ability, rather than the more industrially relevant kinetic (dynamic) capacity. Here, we report that a known MOF, Mg-MOF-74, with open magnesium sites, rivals competitive materials in CO(2) capture, with 8.9 wt. % dynamic capacity, and undergoes facile CO(2) release at significantly lower temperature, 80 degrees C. Mg-MOF-74 offers an excellent balance between dynamic capacity and regeneration. These results demonstrate the potential of MOFs with open metal sites as efficient CO(2) capture media.
Britt
David
D
Center for Reticular Chemistry at the California NanoSystems Institute, Department of Chemistry and Biochemistry, University of California, 607 Charles E. Young Drive East, Los Angeles, CA 90095, USA.
Furukawa
Hiroyasu
H
Wang
Bo
B
Glover
T Grant
TG
Yaghi
Omar M
OM
D000327:Adsorption; D002245:Carbon Dioxide / Q000302:isolation & purification*; D018360:Crystallography, X-Ray; D008274:Magnesium / Q000737:chemistry*; D008697:Methane / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry*
D009930:Organic Chemicals; D002245:Carbon Dioxide; D008274:Magnesium; D008697:Methane