21203024) and the Award ‘Min-Jiang Scholar Program’ in Fujian
Province, China.
Notes and references
z Crystal data for UTSA-30: C51H48N3O9Yb, M = 1019.98, trigonal,
%
space group P3m1, a = b = 17.0600(17) A, c = 9.2376(18) A, V =
,
2328.3(6) A3, Z = 2, Dc = 1.455 g cmꢁ3, m(Mo-Ka) = 2.067 mmꢁ1
F(000) = 1034, final R1 = 0.0496 for I > 2s(I), wR2 = 0.1722 for all
data, GoF = 1.072, CCDC 894905.
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Fig. 4 Pulse chromatographic separation of an equimolar 8-component
mixture CH4–CO2–N2–C2H2–C2H4–C2H6–C3H6–C3H8 using UTSA-30a
at 296 K. The x-axis is the dimensionless time. The pulse of the equimolar
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from the adsorber is that of N2 which can be recovered in
nearly pure form. Following the removal of N2, we see the
emergence of the peak for CH4 that can be recovered in pure
form, practically free of impurities. The next peak to emerge
from the adsorber is that of CO2, which can be recovered and
perhaps sequestered. Following the removal of CO2, we
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(C2H6 + C2H4 + C2H2). UTSA-30a is not able to separate these
into individual components. Once the C2 hydrocarbons are
collected, these can be separated into nearly pure components
by use of adsorbents such as MgMOF-74 and FeMOF-74.11c,12
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(C3H6 + C3H8). Once the C3 hydrocarbon mixtures are collected,
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adsorbents such as MgMOF-74 and FeMOF-74.11c,12
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The influence of the composition of the feed gas on the
performance of UTSA-30a was also investigated in detail. These
results are presented in Fig. S11 and S13 (ESIw). The adsorption
selectivities are not significantly influenced by mixture composi-
tions, and the fractionation ability is not dependent on the
chosen mixture composition. By comparison, the separation
performance of UTSA-30a for purification of natural gas is
comparable to that of the traditionally used NaX zeolite, as
evidenced from Fig. S14 (ESIw). There are no strong binding sites
to interact with hydrocarbons, so both pore sizes and curvatures
have played the important roles in hydrocarbon separation.
In summary, a robust porous Ln-MOF with high thermal
stability and novel topology was constructed from a new
aromatic tricarboxylate, exhibiting the potential for separation
of carbon dioxide, nitrogen, and heavy hydrocarbons from
methane for natural gas purification purpose. It is expected
that this work will initiate more investigations on the emerging
MOFs for such an industrially important separation.
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This work was supported by an AX-1730 from Welch
Foundation (BC), and partially supported by NSFC (21273033,
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c
10858 Chem. Commun., 2012, 48, 10856–10858
This journal is The Royal Society of Chemistry 2012