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Combined Nuclear Magnetic Resonance and Molecular Dynamics Study of Methane Adsorption in M2 (dobdc) Metal–Organic Frameworks

Journal Article · · Journal of Physical Chemistry. C

We investigate the diffusion of methane in the metal-organic frameworks M2 (dobdc) (M = Mg, Ni, Zn; dobdc4- = 2,5-dioxido-1,4-benzenedicarboxylate) as a function of methane loading through a combination of nuclear magnetic resonance and molecular dynamics simulations. At low gas densities, our results suggest that favorable CH4 -CH4 interactions lower the free energy barrier for methane hopping between coordinatively unsaturated metal sites and thus enhance the translational motion of methane down the c-axis. At higher gas densities, CH4 -CH4 interactions become more significant, CH4 -CH4 collisions become more frequent, and the gas self-diffusion begins to decrease. Lastly, we determine that the self-diffusion coefficient of methane is inversely related to the binding energy at the coordinatively unsaturated metal sites, such that diffusion is most rapid in the Zn2(dobdc) framework.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Aachen-California Network of Academic Exchange (DAAD Germany)
Grant/Contract Number:
AC02-05CH11231; SC0001015
OSTI ID:
1542406
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 19 Vol. 123; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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