A Rod‐Packing Hydrogen‐Bonded Organic Framework with Suitable Pore Confinement for Benchmark Ethane/Ethylene Separation

Abstract

Fort he separation of ethane from ethylene,i t remains challenging to target both high C 2 H 6 adsorption and selectivity in aC 2 H 6 -selective material. Herein, we report ar eversible solid-state transformation in al abile hydrogenbonded organic framework to generate an ew rod-packing desolvated framework (ZJU-HOF-1) with suitable cavity spaces and functional surfaces to optimally interact with C 2 H 6 .Z JU-HOF-1 thus exhibits simultaneously high C 2 H 6 uptake (88 cm 3 g À1 at 0.5 bar and 298 K) and C 2 H 6 /C 2 H 4 selectivity (2.25), which are significantly higher than those of most top-performing materials.T heoretical calculations revealed that the cage-like cavities and functional sites synergistically "match" better with C 2 H 6 to provides tronger multipoint interactions with C 2 H 6 than C 2 H 4 .Incombination with its high stability and ultralow water uptake,this material can efficiently capture C 2 H 6 from 50/50 C 2 H 6 /C 2 H 4 mixtures in ambient conditions under 60 %RH, providing arecordpolymer-grade C 2 H 4 productivity of 0.98 mmol g À1 .

A robust ethane-selective hypercrosslinked porous organic adsorbent with high ethane capacity

“…3a). This value exceeded that of C 2 H 6 -selective metal-free porous organic materials such as ZJU-HOF-1 (109 cm 3 g −1 ), 13 CPOC-301 (87 cm 3 g −1 ), 20 HOF-BTB (69.2 cm 3 g −1 ), 35 and HOF-76a (66.08 cm 3 g −1 ) (Fig. 3b and Table S4†).…”

“…Moreover, COFs and HOFs have recently been used for C 2 H 4 separation and have demonstrated several advantages, including tunable structures and properties. 11–13…”

“…14,15 Indeed, as a result of the successful implementation of nonpolar pore properties by sophisticated design, C 2 H 6 -selective adsorbents based on MOFs, COFs, HOFs, and porous organic cages have been developed in recent years. 5–8,11,13,16–20 However, because they exhibit poor structural stability and problems with large-scale synthesis, it is necessary to develop a suitable porous material that lacks the shortcomings of existing materials.…”

A Microporous Titanate‐Based Metal‐Organic Framework for Efficient Separation of Acetylene from Carbon Dioxide

“…Among the diverse adsorbents, the emerging metal-organic frameworks (MOFs) show tremendous advantages due to their large surface areas, tunable pore sizes and diverse structural functionalities. [18][19][20][21][22][23][24] In the C 2 H 2 /CO 2 separation process, adsorption selectivity and C 2 H 2 uptake capacity are two equally important criteria that determine the separation performance. Since the two gas molecules have the same molecular size/shape (3.3 Å for both C 2 H 2 and CO 2 ), fine tuning of pore size or flexibility on MOFs is quite limited to achieve high separation performance.…”

“…So far, a large number of porous materials have been developed for C 2 H 2 /CO 2 separation. Among the diverse adsorbents, the emerging metal‐organic frameworks (MOFs) show tremendous advantages due to their large surface areas, tunable pore sizes and diverse structural functionalities [18–24] . In the C 2 H 2 /CO 2 separation process, adsorption selectivity and C 2 H 2 uptake capacity are two equally important criteria that determine the separation performance.…”