An Ultra‐stable Supramolecular Framework Based on Consecutive Side‐by‐side Hydrogen Bonds for One‐step C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> Separation
Hengbo Li, Cheng Chen, Qing Li, Xiang Jian Kong, Yuanzheng Liu, Zhenyu Ji, Shuixiang Zou, Maochun Hong, Mingyan Wu
Abstract
Abstract The one‐step efficient separation of high‐purity C 2 H 4 from C 2 H 4 /C 2 H 6 mixtures by hydrogen‐bonded organic frameworks (HOFs) faces two problems: lack of strategies for constructing stable pores in HOFs and how to obtain high C 2 H 6 selectivity. Herein, we have developed a microporous Mortise‐Tenon‐type HOF ( MTHOF‐1 , MT is short for Mortise‐Tenon structure) with a new self‐assembly mode for C 2 H 4 /C 2 H 6 separation. Unlike previous HOFs which usually possess discrete head‐to‐head hydrogen bonds, MTHOF‐1 is assembled by unique consecutive side‐by‐side hydrogen bonds, which result in mortise‐and‐tenon pores decorated with orderly arranged amide groups and benzene rings. As expected, MTHOF‐1 exhibits excellent stability under various conditions and shows clear separation trends for C 2 H 6 /C 2 H 4 . The IAST selectivity is as high as 2.15 at 298 K. More importantly, dynamic breakthrough experiments have demonstrated that MTHOF‐1 can effectively separate the C 2 H 6 /C 2 H 4 feed gas to obtain polymer‐grade C 2 H 4 in one step even under high‐humidity conditions.