Tuning the separation properties of zeolitic imidazolate framework core–shell structuresviapost-synthetic modification

Abstract

This work shows the synthesis and reaction monitoring of different ZIF-7/8 core–shells and their application in MMMs for CO2 separation.

Polymer‐Stabilized Percolation Membranes Based on Nanosized Zeolitic Imidazolate Frameworks for H2/CO2 Separation

“…The same occurs with the BET specific surface area, which with a value of 1050±19 m 2 /g, is 20% smaller for the core‐shell in comparison with ZIF‐8. The inclusion of bIm in the ZIF‐8 framework structure reduced the maximum quantity adsorbed in comparison to the original ZIF‐8, due to the narrower pore windows of the core‐shell ZIF‐7/8 . The N 2 adsorption of all the PSPMs and their BET specific surface areas are almost negligible.…”

“…The combination of both ZIFs in a hybrid structure has also shown a positive influence in the gas separation performance. Very recently we published the synthesis of ZIF‐7/8 core‐shell particles that showed as Mixed Matrix Membrane (MMM) good results in the separation of H 2 /CO 2 mixtures . ZIF‐7 also presents a denser phase called ZIF‐7(III) obtained in a post‐synthesis treatment by soaking a polar guest molecule like water or methanol into the activated ZIF‐7.…”

Synthesis of ZIF‐93/11 Hybrid Nanoparticles via Post‐Synthetic Modification of ZIF‐93 and Their Use for H2/CO2 Separation

“…[24,33] ZIF-93 and ZIF-11M MMs were also prepared for comparison. %l oading werep repared with the ZIF-93/11h ybrid materials synthesized in DMAc and MeOH.T his 20 wt.…”

“…Post-synthetic modification of MOFs can be classified into three types:c ovalent, dative,a nd post-synthetic deprotection. [24] These modificationr esults of ZIFs represent an interesting way of controlling the particles ize, chemical function, adsorptionproperty,and pore size. In dative post-synthetic modification, the reagent modifies the MOF forming ad ative bond instead, and usually an ew linker or am etal source is incorporated to the framework in this manner.Finally,inpost-synthetic deprotection the destructiono fatarget chemical bond inside an intact MOF resultsi nt he in situ formation of al inker with new chemical functionality.…”

“…Very recently our group also developed the synthesis of ZIF-7/8 core-shell materials by post-synthetic modification. [24] These modificationr esults of ZIFs represent an interesting way of controlling the particles ize, chemical function, adsorptionproperty,and pore size.…”