Noria: A Highly Xe‐Selective Nanoporous Organic Solid

Abstract

Separation of xenon and krypton is of industrial and environmental concern; the existing technologies use cryogenic distillation. Thus, a cost-effective, alternative technology for the separation of Xe and Kr and their capture from air is of significant importance. Herein, we report the selective Xe uptake in a crystalline porous organic oligomeric molecule, noria, and its structural analogue, PgC-noria, under ambient conditions. The selectivity of noria towards Xe arises from its tailored pore size and small cavities, which allows a directed non-bonding interaction of Xe atoms with a large number of carbon atoms of the noria molecular wheel in a confined space.

Computational Screening of Porous Organic Molecules for Xenon/Krypton Separation

“…If we compare the gas adsorption per host molecule, NC1 holds more gas molecules than NC2, with 1. 26 We attribute these minor differences to batch-to-batch variability and experimental error. The calculated selectivities for the 20/80 molar ratio mixture of Xe and Kr are shown with respect to the Xe uptake in Figure 9.…”

Selective separation of Xe/Kr and adsorption of water in a microporous hydrogen-bonded organic framework

“…This selective separation is mainly due to strong van der Waals interaction between HOF-BTB and C 2 hydrocarbons. Since van der Waals interaction between the framework of HOF-BTB and noble gases is expected to be the most crucial factor for adsorption, 26,27 the results suggest that HOF-BTB would be a useful candidate for selective separation of noble gas mixtures.…”

Formation of Water Channels in the Crystalline Hydrates of Macrocyclic Compounds

“…Unique cyclic shape and ability to carry different functional groups make macrocyclic compounds eligible for applications in the fields such as pharmaceuticals, chromatography, nanotechnology, and gas sorption/separation . For example, cyclodextrin, a cyclic oligomer of glucose has proven to be useful in pharmaceutical product development owing to higher water solubility and ability to form stable inclusion complex with drug molecules .…”

“…Unique cyclic shape and ability to carry different functional groups make macrocyclic compounds eligible for applications in the fields such as pharmaceuticals, [1,2] chromatography, [3,4] nanotechnology, [5,6] and gas sorption/separation. [7,8] For example, cyclodextrin,acyclic oligomer of glucose has provent ob e useful in pharmaceutical product development owing to higher water solubility and ability to form stable inclusion complexw ith drug molecules. [9] Higher crystallinity ande ase of the synthesis are major advantages of these macrocyclic compounds for respective applications.T he list of such macrocyclic compounds includes calixarenes, cucirbiturils, pillarenes, and cyclodextrins.…”