Tetrazole‐Functionalized Zirconium Metal‐Organic Cages for Efficient C₂H₂/C₂H₄ and C₂H₂/CO₂ Separations

Abstract

Isoreticular functionalization is a well‐elucidated strategy for pore environment tuning and the basis of gas separation performance in extended frameworks. The extension of this approach to discrete porous molecules such as metal‐organic cages (MOCs) is conceptually straightforward but hindered by synthetic complications, especially stability concerns. We report the successful isoreticular functionalization of a zirconium MOC with tetrazole moiety by bottom‐up synthesis. The title compound (ZrT‐1‐tetrazol) shows promising C2H2/CO2 and C2H2/C2H4 separation performance, as demonstrated by adsorption isotherms, breakthrough experiments, and density functional theory calculations. The design analogy between MOFs and highly stable MOCs may guide the synthesis of novel porous materials for challenging separation applications.

Dual stimuli-responsive porous ionic liquids with reversible phase transition behavior based on ionic liquid crystals for CO2 and C2H4 adsorption

“…Nonetheless, the PXRD patterns show a negligible change after three cycles of reversible transition between the PIL and PILC phases, revealing the outstanding regenerated reversible transitions and adsorption–desorption stability of the SRPILs (Fig. S28†), 40 which can play a significant role in practical industrial applications. Overall, the SRPILs displayed favorable C 2 H 4 adsorption capacity and selectivity from a CO 2 /C 2 H 4 mixture, which is very crucial for industrial ethylene purification.…”

Negative electrostatic potentials in a Hofmann-type metal-organic framework for efficient acetylene separation

“…In industry, trace C 2 H 2 removal is achieved by partial hydrogenation or solvent absorption, which are energy- and cost-intensive 9 . Therefore, alternative technologies with high capital efficiency have attracted great interest in separating C 2 H 2 from CO 2 and C 2 H 4 due to their industrial relevance and scientific challenge, such as adsorptive separations 10 .…”

Ligand Bent-Angle Engineering for Tuning Topological Structures and Acetylene Purification Performances of Copper-Diisophthalate Frameworks

“…52 A single-site Langmuir−Freundlich equation q = q sat bp v /(1 + bp v S5). Due to the high porosity, these values are relatively moderate compared to the leading MOFs but still are similar to and even surpass that of most literature compounds under the same conditions, such as BUT-70B (C 2 H 2 /CH 4 : 23.3), 53 55 FJU-90 (C 2 H 2 / CO 2 : 4.3), 56 JNU-1 (C 2 H 2 /CO 2 : 4.0), 57 NTU-55 (C 2 H 2 / CO 2 : 4.0), ZJNU-100 (C 2 H 2 /CO 2 : 3.81), 25 Cu-CPAH (C 2 H 2 /CO 2 : 3.6), 58 UTSA-68 (C 2 H 2 /CO 2 : 3.4), 59 UiO-66- tetrazol (C 2 H 2 /CO 2 : 2.89), 60 SNNU-27-Fe (C 2 H 2 /CO 2 : 2.0), 61 and Ni(dpip) (C 2 H 2 /CO 2 : 2.0). 62 As discussed above, the three compounds exhibit the inconsistent sequence of both uptake capacity and adsorption selectivity for separating a binary mixture consisting of C 2 H 2 and CO 2 , which poses a challenge to compare their separation performance directly.…”