Student Hosted Colloquia: Professor Jeff Long, UC Berkeley

"Cooperative Adsorption and Gas Separations in Metal-Organic Frameworks"

About the Seminar

Owing to their high surface areas, tunable pore dimensions, and adjustable surface functionality, metal-organic frameworks (MOFs) can offer advantages for a variety of gas storage and gas separation applications.  In an effort to help curb greenhouse gas emissions from power plants, we are developing new MOFs for use as solid adsorbents in post- and pre-combustion CO2 capture, and for the separation of O2 from air, as required for oxy-fuel combustion.  In particular, MOFs with diamine-functionalized metal sites are demonstrated to operate via an unprecedented cooperative insertion mechanism, leading to high selectivities and working capacities for the adsorption of CO2 over N2 under flue gas conditions.1  Multicomponent adsorption measurements further show these compounds to be effective in the presence of water,2 while calorimetry and temperature swing cycling data reveal low regeneration temperatures compared to aqueous amine solutions.3,4  MOFs with redox-active coordinatively-unsaturated metal centers, such as the Fe2+ sites in Fe2(dobdc) (dobdc4– = 2,5-dioxido-1,4- benzenedicarboxylate) allow the selective adsorption of O2 over N2 via an electron transfer mechanism.5  The same material is demonstrated to be effective at 45 °C for the fractionation of mixtures of C1 and C2 hydrocarbons, and for the high-purity separation of ethylene/ethane and propylene/propane mixtures.6  In addition, it will be shown that certain structural features possible within MOFs, but not in zeolites, can enable the fractionation of hexane isomers according to the degree of branching or octane number.7  Finally, a new spin transition mechanism will be elaborated as a means of achieving cooperative CO adsorption.8

References

1.       McDonald, T. M.; Mason, J. A.; Kong, X.; Bloch, E. D.; Gygi, D.; Dani, A.; Crocellà, V.; Giordano, F.; Odoh, S.; Drisdell, W.; Vlaisavljevich, B.; Dzubak, A. L.; Poloni, R.; Schnell, S. K.; Planas, N.; Kyuho, L.; Pascal, T.; Prendergast, D.; Neaton, J. B.; Smit, B.; Kortright, J. B.; Gagliardi, L.; Bordiga, S.; Reimer, J. A.; Long, J. R. Nature 2015, 519, 303.

2.       Mason, J. A.; McDonald, T. M.; Bae, T.-H.; Bachman, J. E.; Sumida, K.; Dutton, J. J.; Kaye, S. S.; Long, J. R. J. Am. Chem. Soc. 2015, 137, 4787.

3.       Siegelman, R. L.; McDonald, T. M.; Gonzalez, M. I.; Martell, J. D.; Milner, P. J.; Mason, J. A.; Berger, A. H.; Bhown, A. S.; Long, J. R. J. Am. Chem. Soc. 2017, 139, 10526.

4.       Milner, P. J.; Siegelman, R. L.; Forse, A. C.; Gonzalez, M. I.; Runčevski, T.; Martell, J. D.; Reimer, J. A.; Long, J. R. J. Am. Chem. Soc. 2017, 139, ASAP.

5.       Bloch, E. D.; Murray, L. J.; Queen, W. L.; Maximoff, S. N.; Chavan, S.; Bigi, J. P.; Krishna, R.; Peterson, V. K.; Grandjean, F.; Long, G. J.; Smit, B.; Bordiga, S.; Brown, C. M.; Long, J. R. J. Am. Chem. Soc. 2011, 133, 14814.

6.       Bloch, E. D.; Queen, W. L.; Krishna, R.; Zadrozny, J. M.; Brown, C. M.; Long, J. R. Science 2012, 335, 1606.

7.       Herm, Z. R.; Wiers, B. M.; Mason, J. A.; van Baten, J. M.; Hudson, M. R.; Zajdel, P.; Brown, C. M.; Masciocchi, N.; Krishna, R.; Long, J. R. Science 2013, 340, 960.

8.       Reed, D. A.; Keitz, B. K.; Oktawiec, J.; Mason, J. A.; Runčevski, T.; Xiao, D. J.; Darago, L. E.; Crocellà, V.; Bordiga, S.; Long, J. R. Nature 2017, available online (doi:10.1038/nature23674). 

About the Speaker

Jeffrey R. Long is a Professor of Chemistry and Chemical & Biomolecular Engineering at the University of California, Berkeley and a Senior Faculty Scientist in the Materials Sciences Division at Lawrence Berkeley National Laboratory.  He served as Chair of the Division of Inorganic Chemistry of the American Chemical Society in 2012 and as a founding Associate Editor of the journal Chemical Science, and he is presently Director of the Center for Gas Separations.  In 2014, he co-founded Mosaic Materials, Inc., a company devoted to the development of metal-organic frameworks for low-energy gas separations.  His 270 publications have received more than 45,000 citations, and his recent awards include a UC Berkeley Graduate Assembly Faculty Mentor Award and the 2014 Inorganic Chemistry Lectureship Award.