From layered structure to 8-fold interpenetrated MOF with enhanced selective adsorption of C2H2/CH4 and CO2/CH4

Ultramicroporous Metal–Organic Framework with Inert Pore Surfaces for Inversed Separation of Ethylene from C2 Hydrocarbons Mixtures

“…In addition, the C 2 H 6 and C 2 H 4 adsorption uptake values at 100 kPa are higher than those of some reported famous MOFs, such as NUM-3a (298 K: 20.4 cm 3 cm –3 for C 2 H 6 and 28.9 cm 3 cm –3 for C 2 H 4 ; 273 K: 23.0 cm 3 cm –3 for C 2 H 6 and 34.9 cm 3 cm –3 for C 2 H 4 ), BSF-2 (34.1 cm 3 cm –3 for C 2 H 6 at 298 K), and UPC-33 (32.7 cm 3 cm –3 for C 2 H 6 at 298 K), but these are still lower than those of iso-MOF-4 (71.6 cm 3 cm –3 for C 2 H 6 at 298 K), Azole-Th-1 (298 K: 132.5 cm 3 cm –3 for C 2 H 6 and 106.7 cm 3 cm –3 for C 2 H 4 ), and NIIC-20-Pr (88.3 cm 3 cm –3 for C 2 H 4 at 273 K) . Meanwhile, the adsorption capacity of C 2 H 2 at 298 K is lower than ZNU-6 (193.8 cm 3 cm –3 ) but far higher than those of JLU-Liu33F (14.5 cm 3 cm –3 ) and UPC-71 (25.1 cm 3 cm –3 ) …”

“…50 Meanwhile, the adsorption capacity of C 2 H 2 at 298 K is lower than ZNU-6 (193.8 cm 3 cm −3 ) 51 but far higher than those of JLU-Liu33F (14.5 cm 3 cm −3 ) 52 and UPC-71 (25.1 cm 3 cm −3 ). 53 To further understand the unique reverse adsorption phenomenon, the gas affinities toward C 2 hydrocarbons are estimated with the adsorption heat (Q st ) value calculated from single-component isotherms at 273, 288, and 298 K by utilizing the virial equation. The sequence of the Q st values is C 2 H 6 (37.2 kJ mol −1 ) > C 2 H 2 (35.1 kJ mol −1 ) > C 2 H 4 (33.6 kJ mol −1 ) at zero loading (Figure 2d), which is consistent with uptake values at the low-pressure region and the steepness of the isotherms because the Q st value at zero loading is the most energetically favored site in the framework interacting with gas molecules.…”

Recent advances in metal–organic frameworks for gas adsorption/separation

“…1). [10][11][12][13][14][15][16] Due to the multifunctional and everincreasing demands, it is really wise to further focus on exploring structure-performance connection of MOFs by combining diversied strategies.…”

Recent Advances in Adsorption and Separation of Methane and Carbon Dioxide Greenhouse Gases Using Metal–Organic Framework-Based Composites

“…Extended research has been conducted to achieve these objectives by enhancing the capacity of existing adsorbents or discovering new promising ones with excellent features. Unlike the methane storage systems, in methane enrichment and purification processes, the adsorption of undesirable components such as CO 2 and H 2 O are usually of concern. , For instance, carbon dioxide may be present in an extracted stream of natural gas. This certainly reduces the heating value of natural gas and decreases its conversion rate.…”

“…Unlike the methane storage systems, in methane enrichment and purification processes, the adsorption of undesirable components such as CO of concern. 9,10 For instance, carbon dioxide may be present in an extracted stream of natural gas. This certainly reduces the heating value of natural gas and decreases its conversion rate.…”