<scp>CO<sub>2</sub></scp>/<scp>N<sub>2</sub></scp> and <scp>O<sub>2</sub></scp>/<scp>N<sub>2</sub></scp> Separation Using <scp>Mixed‐Matrix</scp> Membranes with <scp>MOF</scp>‐74 Nanocrystals Synthesized Via Microwave Reactions
Euijin Roh, Iyan Subiyanto, Wanuk Choi, Young Cheol Park, Churl‐Hee Cho, Hyunuk Kim
Abstract
Due to their large surface areas and unique gas adsorption properties, mixed‐matrix membranes (MMMs) with metal–organic frameworks (MOFs) have been extensively studied in relation to various gas separations. In the present paper, we report the quick synthesis of MOF‐74 (M = Mg, Mn, Co, Ni) nanocrystals by microwave reactions and the fabrication of MMMs for use in CO 2 /N 2 and O 2 /N 2 separation. The scanning electron microscopy and energy dispersive X‐ray spectroscopy analysis revealed the homogenous distribution of the MOF‐74 nanocrystals within the polydimethylsiloxane (PDMS). The single gas permeation experiments showed the enhanced CO 2 /N 2 and O 2 /N 2 selectivity by adding the MOF‐74 nanocrystals to the PDMS. This enhanced CO 2 /N 2 and O 2 /N 2 selectivity may be due to the affinity of CO 2 and O 2 toward the Lewis acidic sites of the MOF‐74.