Extraordinarily selective adsorption of CO2 over N2 in a polyethyleneimine-impregnated NU-1000 material
| Autor: | Jo Hong Kang, Tae Ung Yoon, Hee Chul Yang, Min Bum Kim, Hyung Ju Kim, Seo Yul Kim, Youn Sang Bae |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Flue gas
Zirconium Chemistry chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Metal Adsorption Chemical engineering Mechanics of Materials visual_art Desorption Selective adsorption visual_art.visual_art_medium Molecule General Materials Science 0210 nano-technology Selectivity |
| Zdroj: | Microporous and Mesoporous Materials. 281:84-91 |
| ISSN: | 1387-1811 |
| Popis: | Developing an efficient adsorbent for selective separation and capture of CO2 from CO2/N2 mixture is an important and challenging issue for mitigating global warming. In this study, we posited that high CO2/N2 selectivity could be obtained by impregnating polyethyleneimine (PEI) within the pores of NU-1000, a zirconium-based metal-organic framework (MOF), since it has a high surface area (∼2320 m2/g) and free and exposed OH groups but does not have unsaturated metal sites possibly having strong interactions with N2 molecules. A series of PEI-impregnated NU-1000 (PEI(x)@NU-1000) materials with varied PEI loadings have been successfully prepared. As reasoned, PEI(50)@NU-1000 showed the highest CO2/N2 selectivity among the PEI-loaded adsorbents in the literature under similar conditions. Remarkably, it exhibited extremely high CO2/N2 selectivities (∼8000) at low pressures and a very high CO2/N2 selectivity (661) at a typical pressure of flue gas (1 bar). Furthermore, PEI(50)@NU-1000 could efficiently separate CO2/N2 mixture under a dynamic flow condition and maintained its CO2 uptakes during three consecutive adsorption and desorption. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect