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

• 作者: Sisi Jiang Liangying Li Lidong Guo Changhua Song Qiwei Yang Zhiguo Zhang Yiwen Yang Qilong Ren Zongbi Bao
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: ARTICLES
• 页码范围: 666-672
• 页数: 7页
• 语种: 英文

摘要

Owing to the similar physicochemical properties between ethane (C2H6) and ethylene (C2H4),obtaining polymerization-grade C2H4 (≥99.95％ pure) is still a 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-H…π and C-H…O interactions between multiple hydrogen atoms of C2H6 and the host framework.