Tuning Pore Polarization to Boost Ethane/Ethylene Separation Performance in Hydrogen‐Bonded Organic Frameworks

Author:

Zhou Yunzhe1,Chen Cheng1,Krishna Rajamani2,Ji Zhenyu1,Yuan Daqiang1,Wu Mingyan13ORCID

Affiliation:

1. State Key Lab of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

2. Van't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam (The Netherlands

3. University of Chinese Academy of Sciences Beijing 100049 China

Abstract

AbstractHydrogen‐bonded organic frameworks (HOFs) show great potential in energy‐saving C2H6/C2H4 separation, but there are few examples of one‐step acquisition of C2H4 from C2H6/C2H4 because it is still difficult to achieve the reverse‐order adsorption of C2H6 and C2H4. In this work, we boost the C2H6/C2H4 separation performance in two graphene‐sheet‐like HOFs by tuning pore polarization. Upon heating, an in situ solid phase transformation can be observed from HOF‐NBDA(DMA) (DMA=dimethylamine cation) to HOF‐NBDA, accompanied with transformation of the electronegative skeleton into neutral one. As a result, the pore surface of HOF‐NBDA has become nonpolar, which is beneficial to selectively adsorbing C2H6. The difference in the capacities for C2H6 and C2H4 is 23.4 cm3 g−1 for HOF‐NBDA, and the C2H6/C2H4 uptake ratio is 136 %, which are much higher than those for HOF‐NBDA(DMA) (5.0 cm3 g−1 and 108 % respectively). Practical breakthrough experiments demonstrate HOF‐NBDA could produce polymer‐grade C2H4 from C2H6/C2H4 (1/99, v/v) mixture with a high productivity of 29.2 L kg−1 at 298 K, which is about five times as high as HOF‐NBDA(DMA) (5.4 L kg−1). In addition, in situ breakthrough experiments and theoretical calculations indicate the pore surface of HOF‐NBDA is beneficial to preferentially capture C2H6 and thus boosts selective separation of C2H6/C2H4.

Funder

National Natural Science Foundation of China

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Natural Science Foundation of Fujian Province

Publisher

Wiley

Subject

General Chemistry,Catalysis

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