Highly efficient separation of carbon dioxide by a metal-organic framework replete with open metal sites.

Proceedings of the National Academy of Sciences of the United States of America
David BrittOmar M Yaghi

Abstract

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.

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Citations

Oct 8, 2011·Chemical Reviews·Jian-Rong LiHong-Cai Zhou
Dec 30, 2011·Chemical Reviews·Kenji SumidaJeffrey R Long
Dec 5, 2013·Chemical Reviews·Marc Pera-Titus
Apr 30, 2013·Environmental Science & Technology·Muhammad SalehKwang S Kim
Oct 12, 2010·Journal of the American Chemical Society·Nour NijemYves J Chabal
Aug 20, 2010·Journal of the American Chemical Society·Hyunuk KimKimoon Kim
Sep 21, 2010·Journal of the American Chemical Society·Eric D BlochOmar M Yaghi
Nov 3, 2010·Journal of the American Chemical Society·Shuangbing HanBartosz A Grzybowski
Dec 23, 2010·Journal of the American Chemical Society·Baishu ZhengMichael J Zaworotko
Mar 29, 2011·Journal of the American Chemical Society·Zoey R HermJeffrey R Long
May 24, 2011·Journal of the American Chemical Society·James T Hughes, Alexandra Navrotsky
May 13, 2011·Journal of the American Chemical Society·Cai-Yan GaoMei-Xiang Wang
Aug 13, 2011·Journal of the American Chemical Society·Eric D BlochJeffrey R Long
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