Improving the CO2 Adsorption Capacity and Selectivity with ZIF-67: A Study on Synthesis Factors and Structural Parameters
نویسندگان
1 Department of Chemical Engineering, Babol Noshirvani University of Technology, P. O. Box: 47148-71167, Babol, Iran.
2 Department of Chemical Engineering, Faculty of Engineering and Technology, University of Mazandaran, P. O. Box: 47416-13534, Babolsar, Iran.
3 Department of Chemical Engineering, Babol Noshirvani University of Technology, P. O. Box: 47148-71167, Babol, Iran.
doi
10.30501/jree.2025.508558.2285چکیده
In this research, ZIF-67 was used for CO2 capture and its separation from flue gas. To improve the CO2 adsorption capacity, the synthesis factors of ZIF-67 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 1:4:741 molar ratio corresponding to salt, ligand, and solvent, respectively. After comparing the textural properties of the samples, the highest surface area (2285 m2/g) and the lowest pore diameter (1.19 nm) were obtained for the optimum sample, showing good performance for CO2 adsorption. The optimized ZIF-67 adsorbed 0.94 mmol/g of CO2 at 293 K and 1 bar. Furthermore, the sample was used for N2 adsorption at different temperatures, and the highest CO2/N2 selectivity was measured as 5.86 at 313 K. The synthesized ZIF-67 retained more than 93% of its efficiency after five adsorption–desorption cycles, which is a suitable feature for industrial applications in CO2 capture.
