Villalgordo-Hernandez, David , DIAZ PEREZ, MANUEL ANTONIO, BALLOI, VALENTINA, LARA ANGULO, MAYRA ANABEL, Narciso, Javier , SERRANO RUIZ, JUAN CARLOS, Ramos-Fernandez, Enrique V.
No
Chem. Eng. J.
Article
Científica
13.3
2.852
15/11/2023
001096465100001
2-s2.0-85175439203
The Zeolitic Imidazolate Framework 67 (ZIF-67) is a highly promising material owing to its exceptional thermal stability, large specific surface area, costeffectiveness, and versatile applications. One of the potential applications of ZIF-67 is gas separation processes, among which the separation of CO2/CH4 mixtures has attracted great interest nowadays in the biogas sector. However, when it comes to CO2/CH4 separation, ZIF-67 falls short as it lacks the desired selectivity despite its high adsorption capacity. This limitation arises from its relatively low affinity towards CO2. In this study, we have addressed this issue by partially exchanging the ligand of ZIF-67, specifically replacing 2-methylimidazole with 1,2,4 (1H) triazole, which introduces an additional nitrogen atom. This modification resulted in ZIF-67 showing significantly enhanced affinity towards CO2 and, as a result, greater selectivity towards CO2 over CH4. The modified materials underwent thorough characterization using various techniques, and their adsorption capacity was evaluated through high-pressure adsorption isotherms. Furthermore, their separation performance was assessed using the Ideal Solution Adsorption Theory, which provided valuable insights into their potential for efficient gas separation.
Adsorption; Cost effectiveness; High pressure engineering; Ligands; Area cost; CH 4; Gas separation process; High adsorption capacity; Large specific surface areas; Ligand exchanges; Methylimidazole; Nitrogen atom; Synthetic ligands; Zeolitic imidazolate frameworks; Carbon dioxide