Improving the CO۲ Adsorption Capacity and Selectivity with ZIF-۶۷: A Study on Synthesis Factors and Structural Parameters

In this research, ZIF-۶۷ was used for CO۲ capture and its separation from flue gas. To improve the CO۲ adsorption capacity, the synthesis factors of ZIF-۶۷ were optimized. For this purpose, the molar ratios of salt to ligand, salt to solvent, and the synthesis temperature were investigated. The optimum sample, synthesized at room temperature, was prepared with a ۱:۴:۷۴۱ molar ratio corresponding to salt, ligand, and solvent, respectively. After comparing the textural properties of the samples, the highest surface area (۲۲۸۵ m۲/g) and the lowest pore diameter (۱.۱۹ nm) were obtained for the optimum sample, showing good performance for CO۲ adsorption. The optimized ZIF-۶۷ adsorbed ۰.۹۴ mmol/g of CO۲ at ۲۹۳ K and ۱ bar. Furthermore, the sample was used for N۲ adsorption at different temperatures, and the highest CO۲/N۲ selectivity was measured as ۵.۸۶ at ۳۱۳ K. The synthesized ZIF-۶۷ retained more than ۹۳% of its efficiency after five adsorption–desorption cycles, which is a suitable feature for industrial applications in CO۲ capture.

کلیدواژه ها:

CO۲ Adsorption ، ZIF-۶۷ ، Synthesis ، CO۲/N۲ separation