One-step ethylene purification from ternary mixtures by an ultramicroporous material with synergistic binding centers

Abstract

Developing advanced porous materials with industrial potential to separate multicomponent gas mixtures that are structurally similar is a crucial but challenging task. Here, we report the efficient one-step separation of...

Electro‐field alignment in a novel metal–organic framework for benchmark separation of ethylene from a ternary gas mixture

“…This value outperformed all reported adsorbents for C 2 H 2 ‐selective adsorption, such as ZUL‐100 (66 cm 3 g −1 ), ZUL‐500 (72 cm 3 g −1 ), UTSA‐200a (41 cm 3 g −1 ), and NKMOF‐1‐Ni (39 cm 3 g −1 ) under similar conditions (Figure 2B). 10,37,40,41 Furthermore, in comparison to the current adsorbents utilized for one‐step C 2 H 4 separation from C 2 H 2 /CO 2 /C 2 H 4 mixtures, SIFSIX‐TEPE‐Cu exhibited a 4‐fold higher uptake of C 2 H 2 than SIFSIX‐17‐Ni (20 cm 3 g −1 ), 3‐fold higher than that of UTSA‐16 (28 cm 3 g −1 ) and a 2‐fold higher than that of ZNU‐6 (34 cm 3 g −1 ), indicating its superior trace C 2 H 2 removal ability 25,26,28 . In sharp contrast, the C 2 H 4 adsorption capacity at 0.01 bar was negligible (1 cm 3 g −1 ).…”

“… 9,37,43 Meanwhile, the IAST selectivity for CO 2 /C 2 H 4 (50/50, v/v ) reached 6.4, which was superior or comparable to most benchmark one‐step C 2 H 4 separation adsorbents such as that of UTSA‐16 (5.7), ZNU‐6 (7.8), and NTU‐65 (2.5) at 1.0 bar (Table S7). 11,25,28 Given the high CO 2 uptake (65 cm 3 g −1 ) at 0.5 bar, the binary CO 2 /C 2 H 4 co‐adsorption isotherm was predicated by IAST calculations (Figure 2E). SIFSIX‐TEPE‐Cu exhibited a comparable CO 2 capacity (59 cm 3 g −1 ) with UTSA‐16, ZNU‐6, and NTU‐67, meanwhile exhibiting the lowest C 2 H 4 co‐adsorption capacity of 9 cm 3 g −1 24,25,28 .…”

“… 11,25,28 Given the high CO 2 uptake (65 cm 3 g −1 ) at 0.5 bar, the binary CO 2 /C 2 H 4 co‐adsorption isotherm was predicated by IAST calculations (Figure 2E). SIFSIX‐TEPE‐Cu exhibited a comparable CO 2 capacity (59 cm 3 g −1 ) with UTSA‐16, ZNU‐6, and NTU‐67, meanwhile exhibiting the lowest C 2 H 4 co‐adsorption capacity of 9 cm 3 g −1 24,25,28 . The CO 2 /C 2 H 4 uptake ratio reached 6.5, higher than that of UTSA‐16 (5.6), ZNU‐6 (1.8), and NTU‐67 (6.3) 24,25,28 .…”

“…To date, only a limited number of adsorbents have demonstrated efficient purification of C 2 H 4 from C 2 H 2 /CO 2 /C 2 H 4 ternary mixtures in a single step, such as NTU‐65, NTU‐67, ZNU‐6, MFSIX‐17‐Ni, UTSA‐16, and Zn‐atz‐oba 11,24–28 . Nevertheless, the removal capacity of trace C 2 H 2 at low‐pressure ranges remains critical yet unsatisfactory for producing high‐purity C 2 H 4 due to the lack of specific recognition sites within restricted channels.…”

Recent advances on metal–organic frameworks for deep purification of olefins

“…To date, only a select number of MOF materials have been developed for the purpose (Table 3). 118–123 Among them, NTU-65 constructed through the self-assembly of CuSiF 6 and 1,4-di(1 H -imidazole-1-yl)benzene, is a 3D flexible frameworks characterized by a pcu topology. 118 It exhibits selective adsorption of C 2 H 2 and CO 2 by tuning gate openings.…”