A Microporous Hydrogen‐Bonded Organic Framework for the Efficient Capture and Purification of Propylene

Abstract

Adsorptive separation of propylene/propane (C 3 H 6 / C 3 H 8 )m ixture is desired for its potential energy saving on replacing currently deployed and energy-intensive cryogenic distillation. Realizing efficient C 3 H 6 /C 3 H 8 separation in the emerging hydrogen-bonded organic frameworks (HOFs) is very challenging owingt ot he lacko ff unctional sites for preferential gas binding.B yv irtue of crystal engineering,w e herein report af unctionalizedH OF (HOF-16)w ith free -COOH sites for the efficient separation of C 3 H 6 /C 3 H 8 mixtures.Under ambient conditions, HOF-16 shows asignificant C 3 H 6 /C 3 H 8 uptake difference (by 76 %) and selectivity (5.4) in contrast to other carboxylic acid-based HOFs.Modeling studies indicate that free -COOH groups together with the suitable pore confinement facilitate the recognition and highdensity packing of gas molecules.The separation performance of HOF-16 was validated by breakthrough experiments. HOF-16 is stable towards strong acidity and water.

Soft-oxometalates (SOMs): crafting the pillars of a sustainable future

“…Over the last twenty years, HOFs have been applied in numerous areas due to their porous nature, including gas separation and storage, biosensing, use as biocompatible and membrane materials, and catalysis under gentle, eco-friendly conditions. [80][81][82][83][84][85] To improve its durability, HOF materials have been engineered with an oxometalate component, [Mn(OH) 6 Mo 6 O 18 ] 3− , which incorporates guanine to self-assemble into a threedimensional structure. This structure exhibits porosity and internal ionic characteristics, creating a compound with a counter ion and oxidized methionine.…”

Recent progress in gas separation platforms based on hydrogen-bonded organic frameworks (HOFs)

“…At 273 K and 298 K, the uptake of C 2 H 4 was about three times higher than that for C 2 H 6 in the same conditions. 80,[129][130][131][132][133] In 2013, Kim and Bae's groups reported a sturdy porous HOF (HOF-BTB) manufactured using 4,4′,4′′-benzene-1,3,5-triyl-tris (benzoic acid) linkers, which showed the most increased adsorption of ethane and ethylene among other HOFs. On the other hand, an uptake selectivity of HOF-BTB exhibited great uptake for C 2 H 6 over other C 2 gases.…”

Porous amorphous metal–organic frameworks based on heterotopic triangular ligands for iodine and high-capacity dye adsorption

“…As a new type of porous material, metal-organic frameworks (MOFs) have attracted considerable attention due to their large BET surface area, high porosity, tunable pores, and versatile functional sites, which have led to their many applications in adsorption, separation, catalysis, sensing, and so on. [16][17][18][19][20][21][22][23][24] Recently, the use of MOFs as adsorbents for the removal of pollutants (such as organic dyes, radioactive contaminants, and heavy metal ions) from water has been extensively studied. [25][26][27][28][29][30][31][32] Some MOFs show high adsorption capacity, rapid adsorption kinetics, and good selectivity.…”