Título Post-synthetic ligand exchange as a route to improve the affinity of ZIF-67 towards CO2
Autores Villalgordo-Hernandez, David , DIAZ PEREZ, MANUEL ANTONIO, BALLOI, VALENTINA, LARA ANGULO, MAYRA ANABEL, Narciso, Javier , SERRANO RUIZ, JUAN CARLOS, Ramos-Fernandez, Enrique V.
Publicación externa No
Medio Chem. Eng. J.
Alcance Article
Naturaleza Científica
Cuartil JCR 1
Cuartil SJR 1
Fecha de publicacion 15/11/2023
ISI 001096465100001
DOI 10.1016/j.cej.2023.146846
Abstract 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.
Palabras clave Adsorption; Cost effectiveness; High pressure engineering; Ligands; Area cost; CH 4; Gas separation process; High adsorption capacity; Large specific surface areas; Ligand exchanges; Methylimidazole;
Miembros de la Universidad Loyola

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