Unexpected Diffusion Anisotropy of Carbon Dioxide in the Metal–Organic Framework Zn2(dobpdc)

Forse, Alexander C.; Gonzalez, Miguel I.; Siegelman, Rebecca L.; Witherspoon, Velencia J.; Jawahery, Sudi; Mercado, Rocio; Milner, Phillip J.; Martell, Jeffrey D.; Smit, Berend; Blümich, Bernhard; Long, Jeffrey R.; Reimer, Jeffrey A.

doi:10.1021/jacs.7b09453

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

Journal Article · Thu Jan 04 00:00:00 EST 2018 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.7b09453· OSTI ID:1464162

^[1]; Gonzalez, Miguel I. ^[2]; Siegelman, Rebecca L. ^[2];

^[3];

^[3]; Mercado, Rocio ^[3]; Milner, Phillip J. ^[2]; Martell, Jeffrey D. ^[2];

^[4]; Blümich, Bernhard ^[5];

^[6]; Reimer, Jeffrey A. ^[7]

Univ. of California, Berkeley, CA (United States). Dept. of Chemistry. Dept. of Chemical and Biomolecular Engineering. Berkeley Energy and Climate Inst.
Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
Univ. of California, Berkeley, CA (United States). Dept. of Chemistry. Dept. of Chemical and Biomolecular Engineering; École Polytechnique Fedérale de Lausanne (EPFL) (Switzlerland). Inst. of Chemical Sciences and Engineering
RWTH Aachen Univ. (Germany). Inst. of Technical and Macromolecular Chemistry (ITMC)
Univ. of California, Berkeley, CA (United States). Dept. of Chemistry. Dept. of Chemical and Biomolecular Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
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

Metal–organic frameworks are promising materials for energy-efficient gas separations, but little is known about the diffusion of adsorbates in materials featuring one-dimensional porosity at the nanoscale. An understanding of the interplay between framework structure and gas diffusion is crucial for the practical application of these materials as adsorbents or in mixed-matrix membranes, since the rate of gas diffusion within the adsorbent pores impacts the required size (and therefore cost) of the adsorbent column or membrane. In this paper, we investigate the diffusion of CO₂ within the pores of Zn₂(dobpdc) (dobpdc^4– = 4,4'-dioxidobiphenyl-3,3'-dicarboxylate) using pulsed field gradient (PFG) nuclear magnetic resonance (NMR) spectroscopy and molecular dynamics (MD) simulations. The residual chemical shift anisotropy for pore-confined CO₂ allows PFG NMR measurements of self-diffusion in different crystallographic directions, and our analysis of the entire NMR line shape as a function of the applied field gradient provides a precise determination of the self-diffusion coefficients. In addition to observing CO₂ diffusion through the channels parallel to the crystallographic c axis (self-diffusion coefficient D_∥ = (5.8 ± 0.1) × 10^–9 m² s^–1 at a pressure of 625 mbar CO₂), we unexpectedly find that CO₂ is also able to diffuse between the hexagonal channels in the crystallographic ab plane (D_⊥ = (1.9 ± 0.2) × 10^–10 m² s^–1), despite the walls of these channels appearing impermeable by single-crystal X-ray crystallography and flexible lattice MD simulations. Finally, observation of such unexpected diffusion in the ab plane suggests the presence of defects that enable effective multidimensional CO₂ transport in a metal–organic framework with nominally one-dimensional porosity.

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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); National Inst. of Health (NIH) (United States)

Grant/Contract Number:: AC02-05CH11231; SC0001015; GM120799; S10-RR027172

OSTI ID:: 1464162

Journal Information:: Journal of the American Chemical Society, Vol. 140, Issue 5; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 55 works

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

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