CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub> Adsorption Performance of the Metal–Organic Framework HKUST-1 by Modified Synthesis Strategies
Hussein Rasool Abid, Aamir Hanif, Alireza Keshavarz, Jin Shang, Stefan Iglauer
Abstract
High-pressure adsorption of CO 2, H 2, and CH 4 has several applications, including CO 2 capture, methane, and hydrogen storage. The performance ultimately depends on the adsorbent design. Herein, we report a comparative assessment of a Cu-metal–organic framework (MOF) (HKUST-1) by conventional hydrothermal synthesis and its modified analogues, HKUST-N with NH 4 OH and HKUST-Ca with Ca(NO 3 ) 2, for CO 2, CH 4, and H 2 adsorption. The materials showed high CO 2 (12 mol/Kg), CH 4 (2.5–4 mol/Kg), and H 2 (0.4–0.8 mol/Kg) capacities at 50 bar. Owing to different synthesis strategies, the differences in surface area, pore size distribution, morphology, and the presence of calcium species in HKUST-Ca considerably impacted CH 4 and H 2 adsorption, leading to considerable differences in selectivities for various gas mixtures. This work establishes a clear correlation of subtle modifications in synthesis strategies of the MOF HKUST-1 on its morphological characteristics and CO 2, CH 4, and H 2 adsorption performance.