Tunable Robust pacs-MOFs: a Platform for Systematic
Enhancement of the C2H2 Uptake and C2H2/C2H4 Separation Performance
Posted on 2018-02-22 - 20:06
As a modulatable class of porous
crystalline materials, metal–organic frameworks (MOFs) have
gained intensive research attention in the domain of gas storage and
separation. In this study, we report on the synthesis and gas adsorption
properties of two robust MOFs with the general formula [Co3(μ3-OH)(cpt)3Co3(μ3-OH)(L)3(H2O)9](NO3)4(guests)n [L = 3-amino-1,2,4-triazole
(1) and 3,5-diamino-1,2,4-triazole (2);
Hcpt = 4-(4-carboxyphenyl)-1,2,4-triazole], which show the same pacs
topology. Both MOFs are isostructural to each other and show MIL-88-type
frameworks whose pore spaces are partitioned by different functionlized
trinuclear 1,2,4-triazolate-based clusters. The similar framework
components with different amounts of functional groups make them an
ideal platform to permit a systematic gas sorption/separation study
to evaluate the effects of distinctive parameters on the C2H2 uptake and separation performance. Because of the presence
of additional amido groups, the MOF 2 equipped with a
datz-based cluster (Hdatz = 3,5-diamino-1,2,4-triazole) shows a much
improved C2H2 uptake capacity and separation
performance over that of the MOF 1 equipped with atz-based
clusters (Hatz = 3-amino-1,2,4-triazole), although the surface area
of the MOF 1 is almost twice than that of the MOF 2. Moreover, the high density of open metal sites, abundant
free amido groups, and charged framework give the MOF 2 an excellent C2H2 separation performance,
with ideal adsorbed solution theory selectivity values reaching up
to 11.5 and 13 for C2H2/C2H4 (1:99) and C2H2/CO2 (50:50) at
298 K and 1 bar, showing potential for use in natural gas purification.
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Chen, Di-Ming; Sun, Chun-Xiao; Zhang, Nan-Nan; Si, Huan-Huan; Liu, Chun-Sen; Du, Miao (2018). Tunable Robust pacs-MOFs: a Platform for Systematic
Enhancement of the C2H2 Uptake and C2H2/C2H4 Separation Performance. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.7b03278
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AUTHORS (6)
DC
Di-Ming Chen
CS
Chun-Xiao Sun
NZ
Nan-Nan Zhang
HS
Huan-Huan Si
CL
Chun-Sen Liu
MD
Miao Du