Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 341, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2022.112098
Keywords
Cobalt-organic framework; Lewis basic pyridyl site; Open metal site; Selective CO2 capture
Categories
Funding
- characteristics of innovative pro-jects in Colleges and Universities in Guangdong Province [2020KTSCX157]
- Special Projects in Key Fields of Colleges and Uni-versities in Guangdong Province [2020ZDZX047]
- characteristics of innovative projects in Colleges and Universities in Guangdong Province [2020KTSCX157]
- Special Projects in Key Fields of Colleges and Universities in Guangdong Province [2020ZDZX047]
- National Undergraduate Innovation and Entrepreneurship Training Project [2020KTSCX157, 2020ZDZX047]
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource [202110580017]
- Guangdong Technology and Equipment Research Center for Soil and Water Pollution Control
- [202110580018]
- [2020B121201014]
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A new microporous 2D Co-based MOF with high selectivity and adsorption capacity for CO2 has been synthesized, possibly attributed to the pyridyl sites on the ligands and open metal sites on the nodes of the framework.
A new microporous 2D Co-based MOF, [Co-3(C6H3NO2)(2)(cpna)(2)(DMA)(2)](n) (1) (H(2)cpna = 6-(4-carboxylphenyl) nicotinic acid; DMA = N,N-dimethylacetamide), has been synthesized and structurally characterized. Complex 1 shows a 2D network with 1D channel of 6.4 x 9.3 angstrom(2) along the a-axis. Activated 1 (1a) exhibits selective gas adsorption for CO2 as compared to other gas molecules (e.g. C2H2, CH4, CO, N-2) from the experimental single-component gas-adsorption isotherm (at 273K and 298K), molecular simulation and breakthrough experiments (298K). And the adsorption selectivity (CO2/C2H2, CO2/CH4, CO2/CO, and CO2/N-2) was calculated with the ideal adsorbed solution theory (IAST). Activated 1 shows 9.77 wt% (2.22 mmol/g) uptake of CO2 at 1 bar and 273 K. Furthermore, the activation of 1 exhibits high ideal selectivities in adsorption of CO2 over C2H2, CH4, CO, and N2 at 298 K (1 bar), which may be attributed to the pyridyl sites on the ligands and open metal sites on the nodes of the framework. Besides, 1a could adsorb more gas molecules due to thicker layer (10.97 angstrom) of 2D structure.
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