Journal
DALTON TRANSACTIONS
Volume 44, Issue 17, Pages 8190-8197Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4dt03927k
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Funding
- Australian Research Council Future Fellowship Project [FT120100720]
- China Scholarship Council (CSC)
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The incorporation of Lewis base sites and open metal cation sites into metal-organic frameworks (MOFs) is a potential route to improve selective CO2 adsorption from gas mixtures. In this study, three novel amino-functionalized metal-organic frameworks (MOFs): Mg-ABDC [Mg-3(ABDC)(3)(DMF)(4)], Co-ABDC [Co-3(ABDC)(3)(DMF)(4)] and Sr-ABDC [Sr(ABDC)(DMF)] (ABDC = 2-aminoterephthalate) were synthesized by solvothermal reactions of 2-aminoterephthalic acid (H(2)ABDC) with magnesium, cobalt and strontium metal centers, respectively. Single-crystal structure analysis showed that Mg-ABDC and Co-ABDC were isostructural compounds comprising two-dimensional layered structures. The Sr-ABDC contained a three-dimensional motif isostructural to its known Ca analogue. The amino-functionalized MOFs were characterized by powder X-ray diffraction, thermal gravimetric analysis and N-2 sorption. The CO2 and N-2 equilibrium adsorption capacities were measured at different temperatures (0 and 25 degrees C). The CO2/N-2 selectivities of the MOFs were 396 on Mg-ABDC, 326 on Co-ABDC and 18 on Sr-ABDC. Both Mg-ABDC and Co-ABDC exhibit high heat of CO2 adsorption (>30 kJ mol(-1)). The Sr-ABDC displays good thermal stability but had a low adsorption capacity resulting from narrow pore apertures.
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