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Title: Revisiting Anisotropic Diffusion of Carbon Dioxide in the Metal–Organic Framework Zn2(dobpdc)

Journal Article · · Journal of Physical Chemistry. C
ORCiD logo [1];  [2];  [3];  [2]; ORCiD logo [4]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry. Dept. of Chemical and Biomolecular Engineering. Berkeley Energy and Climate Inst.
  2. ABQMR, Inc., Albuquerque, NM (United States)
  3. RWTH Aachen Univ. (Germany). Inst. of Technical and Macromolecular Chemistry (ITMC)
  4. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division

The diffusion of gases confined in nanoporous materials underpins membrane and adsorption-based gas separations, yet relatively few measurements of diffusion coefficients in the promising class of materials, metal–organic frameworks (MOFs), have been reported to date. Recently we reported self-diffusion coefficients for 13CO2 in the MOF Zn2(dobpdc) (dobpdc4– = 4,4'-dioxidobiphenyl-3,3'-dicarboxylate) which has one-dimensional channels with a diameter of approximately 2 nm [Forse, A. C.; J. Am. Chem. Soc. 2018, 140, 1663-1673]. By analyzing the evolution of the residual 13C chemical shift anisotropy line shape at different gradient strengths, we obtained self-diffusion coefficients both along (D) and between (D) the one-dimensional MOF channels. The observation of nonzero D was unexpected based on the single crystal X-ray diffraction structure and flexible lattice molecular dynamics simulations, and we proposed that structural defects may be responsible for self-diffusion between the MOF channels. In this paper we revisit this analysis and show that homogeneous line broadening must be taken into account to obtain accurate values for D. In the presence of homogeneous line broadening, intensity at a particular NMR frequency represents signal from crystals with a range of orientations relative to the applied magnetic field and magnetic gradient field. To quantify these effects, we perform spectral simulations that take into account homogeneous broadening and allow improved D values to be obtained. Finally, our new analysis best supports nonzero D at all studied dosing pressures and shows that our previous analysis overestimated D.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; SC0001015
OSTI ID:
1464169
Journal Information:
Journal of Physical Chemistry. C, Vol. 122, Issue 27; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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  • Pramchu, Sittichain; Jaroenjittichai, Atchara P.; Laosiritaworn, Yongyut
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Cited By (1)

In Operando Analysis of Diffusion in Porous Metal‐Organic Framework Catalysts journal December 2018