Flexible metal-organic framework compounds: In situ studies for selective CO2 capture

JOURNAL OF ALLOYS AND COMPOUNDS

卷:647

Article

Allen, A. J.¹  Espinal, L.¹  Wong-Ng, W.¹  Queen, W. L.^2,3  Brown, C. M.^2,4  Kline, S. R.²  Kauffman, K. L.⁵  Culp, J. T.^5,6  Matranga, C.⁵ 

[1] NIST, Mat Measurement Lab, Gaithersburg, MD 20899 USA

[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA

[4] Univ Delaware, Dept Chem & Biomol Engn, Newark, DE 19716 USA

[5] US DOE, NETL, Pittsburgh, PA 15236 USA

[6] URS Corp, South Pk, PA 15219 USA

关键词: Composite materials;    Nanostructured materials;    Gas-solid reactions;    Microstructure;    Phase transitions;    Neutron diffraction;   

DOI  :  10.1016/j.jallcom.2015.05.148

来源: Elsevier

【 摘 要 】

Results are presented that explore the dynamic structural changes occurring in two highly flexible nanocrystalline metal-organic framework (MOF) compounds during the adsorption and desorption of pure gases and binary mixtures. The Ni(1,2-bis(4-pyridyl) ethylene)[Ni(CN)(4)] and catena-bis(dibenzoylmethanato)-(4,4'-bipyridyl) nickel(II) chosen for this study are 3-D and 1-D porous coordination polymers (PCP) with a similar gate opening pressure response for CO2 isotherms at 303 K, but with differing degrees of flexibility for structural change to accommodate guest molecules. As such, they serve as a potential model system for evaluating the complex kinetics associated with dynamic structure changes occurring in response to gas adsorption in flexible MOF systems. Insights into the crystallo-graphic changes occurring as the MOF pore structure expands and contracts in response to interactions with CO2, N-2, and CO2/N-2 mixtures have been obtained from in situ small-angle neutron scattering and neutron diffraction, combined with ex situ X-ray diffraction structure measurements. The role of structure in carbon capture functionality is discussed with reference to the ongoing characterization challenges and a possible materials-by-design approach. Published by Elsevier B.V.

【 授权许可】

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