期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 22, 页码 5982-5986出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201800693
关键词
azo-linked spacers; CO2 separation; environmental chemistry; IAST selectivity; metal-organic frameworks
资金
- IIT KGP
- SERB, New Delhi [ECR/2015/000041]
Selective adsorption and separation of CO2 from flue gas and landfill gas mixtures have drawn great attention in industry. Porous MOF materials are promising alternatives to achieve such separations; however, the stability in the presence of moisture must be taken into consideration. Herein, we have constructed a microporous metal-organic framework (MOF) {[Co(OBA)(L)(0.5)]center dot S}(n) (IITKGP-8), by employing a V-shaped organic linker with an azo-functionalized N,N spacer forming a 3D network with mab topology and 1D rhombus-shaped channels along the crystallographic 'b' axis with a void volume of 34.2%. The activated MOF reveals a moderate CO2 uptake capacity of 55.4 and 26.5 cm(3)g(-1) at 273 and 295 K/1bar, respectively, whereas it takes up a significantly lower amount of CH4 and N-2 under similar conditions and thus exhibits its potential for highly selective sorption of CO2 with excellent IAST selectivity of CO2/N-2 (106 at 273 K and 43.7 at 295 K) and CO2/CH4 (17.7 at 273 K and 17.1 at 295 K) under 1 bar. More importantly, this MOF exhibits excellent moisture stability as assessed through PXRD experiments coupled with surface area analysis.
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