A calcium-based microporous metal-organic framework for efficient adsorption separation of light hydrocarbons
| Autor: | Qiwei Yang, Zongbi Bao, Zhiguo Zhang, Siyu Pu, Qilong Ren, Jiawei Wang, Yiwen Yang, Lidong Guo, Sufian Alnemrat, Liangying Li |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science General Chemical Engineering 02 engineering and technology General Chemistry Squaric acid Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound Adsorption Hydrocarbon chemistry Chemical engineering Environmental Chemistry Metal-organic framework Thermal stability 0210 nano-technology Ambient pressure BET theory |
| Zdroj: | Chemical Engineering Journal. 358:446-455 |
| ISSN: | 1385-8947 |
| Popis: | Ideal metal-organic frameworks (MOFs) are those have not only significant adsorption separation performances but also excellent vapor and/or thermal stability. In this work, a calcium-based metal-organic framework with high vapor-stability and thermostability, Ca(squarate), was prepared using readily available precursor (CaCO3) and squaric acid as starting materials by hydrothermal method. Characterization techniques including PXRD, TGA and BET surface area analysis reveal that this MOF remains stable no matter whether it was soaked in water or exposed to air for as long as 2 weeks. Moreover, the studied MOF material is capable of discriminating C2 hydrocarbon molecules as it has an appropriate pore diameter around 3.4 A. Excellent efficient separation for C2H2/C2H4 mixture (50:50, v/v) with an adsorption selectivity of 8.1 was realized at room temperature and ambient pressure, on the other hand, it also displayed a good separation performance for C2H4/C4H6 mixture (50:50, v/v) with an adsorption selectivity of 5.9. Furthermore, adsorption mechanism of C2 hydrocarbons in this framework was investigated by the DFT-D calculation. The results revealed that this framework discriminated light hydrocarbons as a result of different interaction strength between hydrocarbons and framework that mainly arise from π-π interactions. |
| Databáze: | OpenAIRE |
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