Reticular Chemistry in Pore Engineering of a Y-Based Metal–Organic Framework for Xenon/Krypton Separation

Abstract

The fine-tuning of metal–organic framework (MOF) pore structures is of critical importance in developing energy-efficient xenon/krypton (Xe/Kr) separation techniques. Capitalizing on reticular chemistry, we constructed a robust Y-based MOF (NU-1801) that is isoreticular to NPF-500 with a shortened organic ligand and a larger metal radius while maintaining the 4,8-connected flu topology, giving rise to a narrowed pore structure for the efficient separation of a Xe/Kr mixture. At 298 K and 1 bar, NU-1801 possessed a moderate Xe uptake of 2.79 mmol/g but exhibited a high Xe/Kr selectivity of 8.2 and an exceptional Xe/Kr uptake ratio of about 400%. NU-1801 could efficiently separate a Xe/Kr mixture (20:80, v/v), as validated by breakthrough experiments, due to the outstanding discrimination in van der Waals interactions of Xe and Kr toward the framework confirmed by grand canonical Monte Carlo simulations. This work highlights the importance of reticular chemistry in designing structure-specific MOFs for gas separation.

Tuning the rare-earth UiO-66 metal–organic framework platform for white light emission

“…This peak is assigned to HF and has been observed in other cluster-based RE-MOFs containing μ 3 -F bridges. 58 Scanning electron microscopy (SEM) micrographs reveal the expected octahedral morphology of Tb : Gd : Eu-UiO-66 with an average crystallite size of 21 μm (Fig. 3).…”

Hydrogen-bonded organic framework with tailored pores prepared by enlarging the core size for high-performance Xe/Kr separation

“…As illustrated in Fig. 2c, the Xe/Kr selectivity ranges from 13.8 to 12.1 as the pressure increases from 0 to 100 kPa at 296 K, which is comparable to that of some benchmark adsorbents 3,57–59 and higher than that of the majority of porous materials, 56,60–64 demonstrating a balanced performance in terms of both uptake and separation selectivity (Fig. S12†).…”

“…2g). Furthermore, although the separation performance is lower than that of the benchmark ZJU-74a-Ni 8 and MOF-Cu–H, 57 it is comparable to that of HOF-ZJU-201a, 10 and superior to those of most absorbents 13,52,53,56,59,62 (Fig. S20†).…”

Polypyrene Porous Organic Framework for Efficiently Capturing Electron Specialty Gases

“…Adsorption separation technology based on porous materials is considered to be one of the promising ways to treat industrial off-gases due to its energy-saving, high-efficiency, and easy-to-operate characteristics. − Many functional porous materials with task-specific and outstanding physicochemical stability have been developed such as metal organic frameworks and porous organic frameworks (POFs). − POFs constructed by organic building units via robust covalent bonds are becoming increasingly significant in porous adsorbents because of their diverse structural types, high stability, non-metallic porous networks. − Plenty of POFs with various geometries and topologies have been developed and studied in detail, including covalent organic frameworks, − porous aromatic frameworks, − porous polymer networks, , polymers of intrinsic microporosity, conjugated microporous polymers, , hyper cross-linked polymers, , etc.…”