De‐Linker‐Enabled Exceptional Volumetric Acetylene Storage Capacity and Benchmark C<sub>2</sub>H<sub>2</sub>/C<sub>2</sub>H<sub>4</sub>and C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub>Separations in Metal–Organic Frameworks
Jia‐Wen Wang, Shu‐Cong Fan, Haipeng Li, Xianhui Bu, Yingying Xue, Quan‐Guo Zhai
Abstract
Abstract An ideal adsorbent for separation requires optimizing both storage capacity and selectivity, but maximizing both or achieving a desired balance remain challenging. Herein, a de‐linker strategy is proposed to address this issue for metal–organic frameworks (MOFs). Broadly speaking, the de‐linker idea targets a class of materials that may be viewed as being intermediate between zeolites and MOFs. Its feasibility is shown here by a series of ultra‐microporous MOFs (SNNU‐98‐M, M=Mn, Co, Ni, Zn). SNNU‐98 exhibit high volumetric C 2 H 2 uptake capacity under low and ambient pressures (175.3 cm 3 cm −3 @ 0.1 bar, 222.9 cm 3 cm −3 @ 1 bar, 298 K), as well as extraordinary selectivity (2405.7 for C 2 H 2 /C 2 H 4 , 22.7 for C 2 H 2 /CO 2 ). Remarkably, SNNU‐98‐Mn can efficiently separate C 2 H 2 from C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 mixtures with a benchmark C 2 H 2 /C 2 H 4 (1/99) breakthrough time of 2325 min g −1 , and produce 99.9999 % C 2 H 4 with a productivity up to 64.6 mmol g −1 , surpassing values of reported MOF adsorbents.