Cooperative insertion of CO2 in diamine-appended metal-organic frameworks

Thomas M. McDonald, Jarad A. Mason, Xueqian Kong, Eric D. Bloch, David Gygi, Alessandro Dani, Valentina Crocellà, Filippo Giordanino, Samuel O. Odoh, Walter S. Drisdell, Bess Vlaisavljevich, Allison L. Dzubak, Roberta Poloni, Sondre K. Schnell, Nora Planas, Kyuho Lee, Tod Pascal, Liwen F. Wan, David Prendergast, Jeffrey B. NeatonBerend Smit, Jeffrey B. Kortright, Laura Gagliardi, Silvia Bordiga, Jeffrey A. Reimer, Jeffrey R. Long

Research output: Contribution to journalArticle

556 Scopus citations

Abstract

The process of carbon capture and sequestration has been proposed as a method of mitigating the build-up of greenhouse gases in the atmosphere. If implemented, the cost of electricity generated by a fossil fuel-burning power plant would rise substantially, owing to the expense of removing CO2 from the effluent stream. There is therefore an urgent need for more efficient gas separation technologies, such as those potentially offered by advanced solid adsorbents. Here we show that diamine-appended metal-organic frameworks can behave as phase-change adsorbents, with unusual step-shaped CO2 adsorption isotherms that shift markedly with temperature. Results from spectroscopic, diffraction and computational studies show that the origin of the sharp adsorption step is an unprecedented cooperative process in which, above a metal-dependent threshold pressure, CO2 molecules insert into metal-amine bonds, inducing a reorganization of the amines into well-ordered chains of ammonium carbamate. As a consequence, large CO2 separation capacities can be achieved with small temperature swings, and regeneration energies appreciably lower than achievable with state-of-the-art aqueous amine solutions become feasible. The results provide a mechanistic framework for designing highly efficient adsorbents for removing CO2 from various gas mixtures, and yield insights into the conservation of Mg 2+ within the ribulose-1,5-bisphosphate carboxylase/oxygenase family of enzymes.

Original languageEnglish (US)
Pages (from-to)303-308
Number of pages6
JournalNature
Volume519
Issue number7543
DOIs
StatePublished - Mar 19 2015

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    McDonald, T. M., Mason, J. A., Kong, X., Bloch, E. D., Gygi, D., Dani, A., Crocellà, V., Giordanino, F., Odoh, S. O., Drisdell, W. S., Vlaisavljevich, B., Dzubak, A. L., Poloni, R., Schnell, S. K., Planas, N., Lee, K., Pascal, T., Wan, L. F., Prendergast, D., ... Long, J. R. (2015). Cooperative insertion of CO2 in diamine-appended metal-organic frameworks. Nature, 519(7543), 303-308. https://doi.org/10.1038/nature14327