Bimetallic UTSA-16 (Zn, X; X = Mg, Mn, Cu) metal organic framework developed by a microwave method with improved CO2 capture performances

A series of bimetallic UTSA-16 (Zn, X; X = Mg, Mn, and Cu) metal organic frameworks (MOFs) with different metal ratios was synthesized using a microwave irradiation method. Synthesis at an optimal Zn-to-metal ratio of 7:2 achieved a 9-18% increase in the CO2 adsorption capacity and an enhanced adsorption selectivity of CO2 over N-2 compared to those of the parent UTSA-16 (Zn). Bimetallic UTSA-16 powders, with ratios of 7:2, were pelletized for a stability study that exposed the pellets to acid gases (NO2 and SO2) in a humid air condition; additionally, they underwent adsorption-desorption cyclic experiments. The results showed that the CO2 capture performance was consistent after exposure to NO2 gas in humid air and adsorption-desorption cycling with temperature swing. The morphological properties of the bimetallic MOFs were characterized using scanning electron microscopy, Brunauer - Emmett - Teller analysis, Fourier transform infrared spectroscopy, and X-ray diffraction. The characterization data showed that the bimetallic UTSA-16 (Zn, X) MOFs exhibited good crystallinity and morphology, similar to the original UTSA-16 (Zn) MOF. (C) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.