4.7 Article

A robust ethane-trapping metal-organic framework for efficient purification of ethylene

Journal

SCIENCE CHINA-CHEMISTRY
Volume 64, Issue 4, Pages 666-672

Publisher

SCIENCE PRESS
DOI: 10.1007/s11426-020-9929-8

Keywords

metal-organic frameworks; adsorption separation; ethane; ethylene

Funding

  1. National Natural Science Foundation of China [21722609, 21878260]
  2. Zhejiang Provincial Natural Science Foundation of China [LR17B060001]

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This study reports a robust scandium-based metal-organic framework connected by an oxygen-rich phenyl ligand, which shows high adsorption capacity for C2H6 and superior selectivity for separating C2H6/C2H4 mixture. Theoretical calculations demonstrate the trapping of C2H6 molecules in the nonpolar pore surface via specific interactions.
Owing to the similar physicochemical properties between ethane (C2H6) and ethylene (C2H4), obtaining polymerization-grade C2H4 (>= 99.95% pure) is still tricky problem in the petrochemical industry. Here, we report a robust scandium-based metal-organic framework (ScBPDC), which is connected by oxygen-rich phenyl ligand with exceptionally high thermal stability (up to 873 K) and capacity of C2H6 (4.94 mmol/g at 100 kPa and 283 K), exhibiting superior separation performance of C2H6/C2H4 mixture (the IAST selectivity is up to 1.7 at 283 K). Importantly, ScBPDC can produce 8.96 L/kg C2H4 with >= 99.99% purity while the C2H4/C2H6 (50:50, v/v) as the mixture injection and the low isosteric heat of ScBPDC (16.4 kJ/mol for C2H6) validates the facility of adsorbent regeneration. Furthermore, theoretical calculations demonstrate the C2H6 molecules are trapped in the nonpolar pore surface via C-HMIDLINE HORIZONTAL ELLIPSIS pi and C-HMIDLINE HORIZONTAL ELLIPSISO interactions between multiple hydrogen atoms of C2H6 and the host framework.

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