MOF Materials for the Capture of Highly Toxic H₂S and SO₂

Abstract

Metal−organic frameworks (MOFs) are some of the most interesting and promising candidates to sequester toxic H 2 S and SO 2 gases. MOFs show interesting advantages over classic porous materials due to their chemical composition, ligand functionality, cavity dimensions, ease of preparation, and relatively low cost reactivation. The optimization of the physical−chemical interactions between MOFs and H 2 S and SO 2 molecules is the key to further amplification of their capture. Reversibility after the adsorption of H 2 S and SO 2 can be modulated through noncovalent bonding between functionalized ligands (within MOF structures) and H 2 S and SO 2 . This review aims to summarize recent advances in the development of MOF-based systems for the capture and removal of H 2 S and SO 2 . We anticipate that this review article can offer very useful information on the significant and rapid progress of the enhancement of H 2 S and SO 2 capture by MOFs.

Comparative Evaluation of Different MOF and Non‐MOF Porous Materials for SO2 Adsorption and Separation Showing the Importance of Small Pore Diameters for Low‐Pressure Uptake

“…for prospective gas storage and gas separation [ 29–31 ] or the capture of toxic and polluting gases. [ 32–38 ] Yet, MOFs are often not of high chemical and hydrothermal stability. [ 39 ] An advantage of MOFs is clearly their designability, in particular their controllable pore size and modifiable pore surface is unmatched, yet, other porous materials may also feature good SO 2 uptake characteristics.…”

A Series of new Urea‐MOFs Obtained via Post‐synthetic Modification of NH2‐MIL‐101(Cr): SO2, CO2 and H2O Sorption

“…[16,17] At present, sorption and stability studies of SO 2 in MOFs are still rare compared to H 2 , CO 2 or CH 4 sorption, but are gaining more and more attention. [13,[18][19][20][21][22][23][24][25][26][27][28][29][30] In 2008, Britt et al began investigating several MOFs with respect to SO 2 . [31] Subsequent research constantly extended the understanding of SO 2 @MOF and further expanded the limit of SO 2 capacity.…”

Crystalline Naphthylene Macrocycles Capturing Gaseous Small Molecules in Chiral Nanopores

“…Because of the chiral environments originating from unique cyclostereoisomerism, [20] the nanopores should be able to arrange/align many other small molecules in chiral positions. In the near future, we will explore small, gaseous substrates such as H 2 S [30,31] . We believe that the design of chiral nanoporous materials for the chiral alignment of small molecules may be an interesting subject to explore in materials science [32] …”