Methane Storage
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A strategy based on reticulating metal ions and organic carboxylate links into
extended networks has been advanced to a point that allowed the design of
porous structures in which pore size and functionality could be varied systematically.
Metal-organic framework (MOF-5), a prototype of a new class of
porous materials and one that is constructed from octahedral Zn-O-C clusters
and benzene links, was used to demonstrate that its three-dimensional porous
system can be functionalized with the organic groups -Br, -NH2, -OC3H7,
-OC5H11, -C2H4, and -C4H4 and that its pore size can be expanded with the
long molecular struts biphenyl, tetrahydropyrene, pyrene, and terphenyl. We
synthesized an isoreticular series (one that has the same framework topology)
of 16 highly crystalline materials whose open space represented up to 91.1%
of the crystal volume, as well as homogeneous periodic pores that can be
incrementally varied from 3.8 to 28.8 angstroms. One member of this series
exhibited a high capacity for methane storage (240 cubic centimeters at standard
temperature and pressure per gram at 36 atmospheres and ambient
temperature), and others the lowest densities (0.41 to 0.21 gram per cubic
centimeter) for a crystalline material at room temperature.
Recent Leading Publications:
A microporous metal-organic framework for gas-chomatographic separation of
alkanes, B. L. Chen, C. D. Liang, J. Yang, D. S. Contreras,Y. Clancy, E.
B. Lobkovsky,
O. M. Yaghi, S. Dai, Angew. Chem. Int. Ed., 2006, 45 (9), 1390-1393.
Metal-organic frameworks: a new class of porous materials, J. Roswell,
O. M. Yaghi,
Micro- and Mesoporous Mater., 2004, 73, 3.
Design of new materials for methane storage, T. Duren, L. Sarkisov, O.
M. Yaghi, R. Q. Snurr, Langmuir, 2004, 20, 2683.
Systematic design of pore size and functionality in metal-organic frameworks
and application in methane storage, M. Eddaoudi, J. Kim, N. Rosi, D. Vodak,
M. O'Keeffe, O. M. Yaghi, Science, 2002, 295, 469.
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