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Enhanced one-step purification of C2H4 from C2H2/C2H4/C2H6 mixtures by fluorinated Zr-MOF |
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| Authors: | Jiaqi Liu Jiafeng Miao Hao Wang Yanli Gai Jing Li |
| Affiliation: | 1. Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen, Guangdong, China
Contribution: ?Investigation (lead), Project administration (lead), Writing - original draft (lead);2. Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen, Guangdong, China Contribution: ?Investigation (equal), Methodology (equal);3. Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen, Guangdong, China;4. School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu, China |
| Abstract: | The extraction of C2H4 from C2H6/C2H4/C2H2 mixtures is of great significance in the chemical industry for C2H4 production but the process remains challenging due to the similarity of these C2 hydrocarbon species in their molecular size and physical properties. Here, we report the fluorination of a stable Zr-MOF, UiO-66, to fine-tune the pore dimensions and pore functionality. In particular, UiO-66-CF3 shows notably preferential adsorption of C2H6 and C2H2 over C2H4, with C2H2/C2H4 and C2H6/C2H4 selectivities of 1.4 and 1.9, respectively. Theoretical calculations provide insight into the binding sites of UiO-66-CF3 for C2 hydrocarbon adsorption. Breakthrough experiments further confirmed the capability of the material for purification of C2H4 from C2H2/C2H4/C2H6 ternary mixtures, evidenced by the high purity C2H4 (99.9%+) obtained directly from outlet gas. |
| Keywords: | adsorptive separation ethylene purification ethylene/ethane/acetylene separation metal–organic frameworks |