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 Mg2+ within the ribulose-1,5-bisphosphate carboxylase/oxygenase family of enzymes.

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Acknowledgements

We thank A. S. Bhown and A. H. Berger of EPRI, H. Krutka, C. M. Brown and. K. S. Suslick for discussions, and L. Ribaud and the 11-BM staff at the Advanced Photon Source at Argonne National Laboratory for assisting with powder X-ray diffraction experiments. The work presented here pertaining to the synthesis and gas adsorption properties of metal-organic frameworks was funded by the Advanced Research Projects Agency–Energy (ARPA-E), US Department of Energy (DOE), under award numbers DE-AR0000103 and DE-AR0000402. Funding pertaining to the characterization of materials by spectroscopy and X-ray diffraction and the computational work performed by W.S.D., B.V., R.P., S.K.S., K.L., J.B.N., B.S. and J.B.K. was provided by the Center for Gas Separations Relevant to Clean Energy Technologies, an Energy Frontier Research Center funded by the DOE, Office of Science, Office of Basic Energy Sciences under award DE-SC0001015. Experiments performed in Turin were supported by grant MIUR-PRIN 2010-2011. Work at SIMAP was performed using computer resources from GENCI (CINES grant 2014-c2015097211). The computational work performed by S.O.O., A.L.D., N.P. and L.G. was supported through the Nanoporous Materials Genome Center of the DOE, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences, under award number DE-FG02-12ER16362. This research used resources of the Advanced Photon Source, a DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357. Portions of this work (use of beamline 6.3.2 at the Advanced Light Source; a user project at The Molecular Foundry, facilitated by T.P., L.F.W. and D.P., and use of its computer cluster vulcan, managed by the High Performance Computing Services Group; use of the National Energy Research Scientific Computing Center) were performed at Lawrence Berkeley National Laboratory, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the DOE under contract no. DE-AC02-05CH11231. For fellowship support, we further thank the National Science Foundation (J.A.M.), Gerald K. Branch and Arkema (E.D.B.) and the Research Council of Norway (grant 230534 to S.K.S.).

Author information

Affiliations

  1. Department of Chemistry, University of California, Berkeley, California 94720, USA

    • Thomas M. McDonald
    • , Jarad A. Mason
    • , Eric D. Bloch
    • , David Gygi
    •  & Jeffrey R. Long
  2. Department of Chemical and Biological Engineering, University of California, Berkeley, California 94720, USA

    • Xueqian Kong
    • , Bess Vlaisavljevich
    • , Sondre K. Schnell
    • , Kyuho Lee
    • , Berend Smit
    •  & Jeffrey A. Reimer
  3. Department of Chemistry, Zhejiang University, Hangzhou 310027, China

    • Xueqian Kong
  4. Chemistry Department, NIS and INSTM Centre of Reference, University of Turin, Via Quarello 15, I-10135 Torino, Italy

    • Alessandro Dani
    • , Valentina Crocellà
    • , Filippo Giordanino
    •  & Silvia Bordiga
  5. Department of Chemistry, Chemical Theory Center and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA

    • Samuel O. Odoh
    • , Allison L. Dzubak
    • , Nora Planas
    •  & Laura Gagliardi
  6. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

    • Walter S. Drisdell
    • , Berend Smit
    • , Jeffrey B. Kortright
    • , Jeffrey A. Reimer
    •  & Jeffrey R. Long
  7. Université Grenoble Alpes, Science et Ingénierie des Matériaux et Procédés (SIMAP), F-38000 Grenoble, France

    • Roberta Poloni
  8. Centre National de la Recherche Scientifique, SIMAP, F-38000, Grenoble, France

    • Roberta Poloni
  9. Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway

    • Sondre K. Schnell
  10. Molecular Foundry, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, USA

    • Kyuho Lee
    • , Tod Pascal
    • , Liwen F. Wan
    • , David Prendergast
    •  & Jeffrey B. Neaton
  11. Department of Physics, University of California, Berkeley, California 94720, USA

    • Jeffrey B. Neaton
  12. Kavli Energy Nanosciences Institute, University of California, Berkeley, California 94720, USA

    • Jeffrey B. Neaton
  13. Institut des Sciences et Ingénierie Chimiques, Valais, École Polytechnique Fédérale de Lausanne (EPFL), Rue de l’Industrie 17, CH-1950 Sion, Switzerland

    • Berend Smit

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Contributions

T.M.McD. and J.R.L. formulated the project. T.M.McD., E.D.B. and D.G. synthesized the compounds. T.M.McD. collected and analysed the gas adsorption data. J.A.M. collected and analysed the X-ray diffraction data. X.K. collected the NMR data. X.K. and J.A.R. analysed the NMR data. T.M.McD., A.D., V.C., F.G. and S.B. collected and analysed the infrared data. W.S.D. and J.B.K. collected X-ray absorption spectroscopy data and performed analysis, with assistance from R.P., T.P., L.F.W. and D.P. S.O.O., B.V., A.L.D., R.P., S.K.S., N.P. and K.L. performed the computations and analysed the results. J.B.N., B.S. and L.G. helped with the computational analyses. T.M.McD., J.A.M. and J.R.L. wrote the paper, and all authors contributed to revising the paper.

Competing interests

The authors and the University of California have filed for a patent on some of the results contained herein.

Corresponding author

Correspondence to Jeffrey R. Long.

Metrical data for the solid-state structures of mmen-Mn2(dobpdc) without and with adsorbed CO2 are available free of charge from the Cambridge Crystallographic Data Centre under reference numbers CCDC 994497 and 994498, respectively.

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    Supplementary Information

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https://doi.org/10.1038/nature14327

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