Decorated Traditional Zeolites with Subunits of Metal–Organic Frameworks for CH₄/N₂ Separation

Abstract

Metal–organic frameworks (MOF) materials are promising materials for gas separation, but their application still faces various challenges. A strategy is now reported for introducing subunits of MOFs into traditional zeolite frameworks to obtain applicable adsorbents with advantages of both zeolites and MOFs. The subunits of ZIFs were introduced into zeolite Y and zeolite ZSM‐5 for CH4/N2 separation. Both the molecular simulation and experimental results validated that the IAST CH4/N2 selectivity of the resulting samples greatly improved (above 8, at 100 kPa and 25 °C) with the incorporation of ZIF subunits into zeolites structure, and the selectivities were obviously higher than that of zeolites and even better than that of ZIFs. This strategy not only gave rise to an efficient adsorbent for CH4/N2 separation but also provided ideas for design of other adsorption and separation materials.

Facile synthesis of ultramicroporous carbon adsorbents with ultra‐high CH4 uptake by in situ ionic activation

“…One potential strategy for accomplishing this goal involves the selective adsorption of dilute CH 4 from a stream of CH 4 /N 2 by porous materials, which would be both economically and operationally feasible, as well as highly energy efficient. In this regard, many adsorptive materials, including metal–organic frameworks (MOFs), zeolites, and carbon‐based adsorbents, have been examined for the separation of CH 4 /N 2 7‐10 . Specifically, MOFs comprise a new generation of porous materials that have recently demonstrated excellent CH 4 adsorption properties; for example, MOF‐177, 11 M 3 (HCOO) 6 (M = Co, Ni), 12 Co 3 (C 4 O 4 ) 2 (OH) 2 , 13 all exhibit high uptake values for CH 4 , or high CH 4 /N 2 selectivity.…”

Fabrication of Microporous Metal–Organic Frameworks in Uninterrupted Mesoporous Tunnels: Hierarchical Structure for Efficient Trypsin Immobilization and Stabilization

“…This is attributed to the change in coordination environment of Zn centers and confirms the formation of ZIF‐8. In 15 N CP/MAS NMR spectrum of ZIF‐8/AS‐1, a single resonance at 204.7 ppm is observed (Supporting Information, Figure S22), which is identical to ZIF‐8 but quite different from pure ligand HmIm that gives two signals at about 244 and 176 ppm . This suggests that N in the ligands are coordinated with Zn, leading to the same chemical environment.…”

Enhanced Propene/Propane Separation by Directional Decoration of the 12‐Membered Rings of Mordenite with ZIF Fragments

“…In our recent work, the strategy of decorating traditional zeolites with MOF subunits proved to be efficient for increasing the CH 4 /N 2 selectivities of zeolites . Here, we developed a series of propene/propane adsorbents by decorating mordenite (MOR) with ZIF fragments whose significant kinetic selectivities were determined.…”