Design and control of gas diffusion process in a nanoporous soft crystal

Abstract

Design of the gas-diffusion process in a porous material is challenging because a contracted pore aperture is a prerequisite, whereas the channel traffic of guest molecules is regulated by the flexible and dynamic motions of nanochannels. Here, we present the rational design of a diffusion-regulatory system in a porous coordination polymer (PCP) in which flip-flop molecular motions within the framework structure provide kinetic gate functions that enable efficient gas separation and storage. The PCP shows substantial temperature-responsive adsorption in which the adsorbate molecules are differentiated by each gate-admission temperature, facilitating kinetics-based gas separations of oxygen/argon and ethylene/ethane with high selectivities of ~350 and ~75, respectively. Additionally, we demonstrate the long-lasting physical encapsulation of ethylene at ambient conditions, owing to strongly impeded diffusion in distinctive nanochannels.

A novel composite derived from a metal organic framework immobilized within electrospun nanofibrous polymers: An efficient methane adsorbent

“…This means theoretical optimizations of reaction parameters affecting the adsorption efficiency of an adsorbent should be considered as a powerful tool for evaluation of a new adsorbent for development of a separation process. The results of this work are consistent with other studies . The RSM optimization was used to find the best experimental conditions by determining the optimal conditions of the experimental parameters (Figure ).…”

Collective Breathing in an Eightfold Interpenetrated Metal–Organic Framework: From Mechanistic Understanding towards Threshold Sensing Architectures

“…The quest for switchable MOFs is driven to a large extent by a range of promising applications exemplified in reports on methane storage, molecular sensing, gas separation, proton conduction, and in reviews on drug delivery . Additionally, the studies of flexible MOFs are motivated by recently revealed novel counterintuitive phenomena such as negative gas adsorption or pronounced negative gas pressure .…”

Selective Aerobic Oxidation of a Metal–Organic Framework Boosts Thermodynamic and Kinetic Propylene/Propane Selectivity

“…[2] Thes eparation of C 3 H 6 /C 3 H 8 mixtures is performed by distillation at high pressure (20 bar). Due to the close-lying boiling points of C 3 H 6 (226 K) and C 3 H 8 (231 K), [3] their relative volatility is very small (1.09-1.15) [4] and the distillation column should have av ery large number of theoretical trays (180 +) [5] and be operated at very high reflux ratios (12)(13)(14)(15)(16)(17)(18)(19)(20), [6] resulting in huge energy consumption. [1] Without phase change,the energy requirement of adsorptive separation is much lower than distillation.…”