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Single-Step Ethylene Purification and MTO Product Separation in a Nitrogen-Rich Microporous Metal–Organic Framework

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posted on 2025-01-29, 09:16 authored by Xinyu Ding, Wei Wang, Suer Guo, Shangyu Wang, Meng Chen, Xingge He, Haitian Zhao, Junyang Jiang, Yu Wang, Yuxiang Liu, Ranran He, Liwei Han, Mingxing Zhang
The nitrogen-rich metal–organic framework (MOF) NTUniv-75, featuring a melamine (MA) functional group, enables efficient one-step C2H4 purification and methanol-to-olefins (MTO) product separation. At 298 K, its adsorption capacity follows the order C2H2 > C3H6 > C2H6 > C2H4. Breakthrough experiments showed that NTUniv-75 produced pure C2H4 from C2 mixtures with a productivity of 22.5 mL g–1. For MTO products, productivities reached 43.0 mL g–1 (C2H4) and 61.9 mL g–1 (C3H6). Notably, C3H6 addition nearly doubled the C2H4 yield. Modeling revealed that MA aids C2H2/C2H4 separation, while pocket-like apertures favor C2H6 adsorption. Additionally, C–H···π interactions between C2H6 and C3H6 enhance C2H4 yield.

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